U.S. patent application number 14/915256 was filed with the patent office on 2016-07-21 for socket fastening-type reinforcing bar connector using binding end member.
The applicant listed for this patent is Yong-Keun KIM. Invention is credited to Yong-Keun KIM.
Application Number | 20160208492 14/915256 |
Document ID | / |
Family ID | 50649665 |
Filed Date | 2016-07-21 |
United States Patent
Application |
20160208492 |
Kind Code |
A1 |
KIM; Yong-Keun |
July 21, 2016 |
SOCKET FASTENING-TYPE REINFORCING BAR CONNECTOR USING BINDING END
MEMBER
Abstract
The present invention relates to a socket fastening-type
reinforcing bar connector using a binding end member and, more
particularly, a reinforcing bar connector is disclosed wherein
binding end members are bound to reinforcing bars, in order to
facilitate processes for joining reinforcing bars, which are the
foundation of reinforced concrete, and processes for joining
between reinforcing bar cages, such that reinforcing bars having
adjacent ends can be precisely connected mechanically through
simple socket fastening.
Inventors: |
KIM; Yong-Keun; (Incheon,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
KIM; Yong-Keun |
Incheon |
|
KR |
|
|
Family ID: |
50649665 |
Appl. No.: |
14/915256 |
Filed: |
September 1, 2014 |
PCT Filed: |
September 1, 2014 |
PCT NO: |
PCT/KR2014/008118 |
371 Date: |
February 29, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E04C 5/165 20130101 |
International
Class: |
E04C 5/16 20060101
E04C005/16 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 9, 2013 |
KR |
10-2013-0108033 |
Claims
1. A socket-fastening-type reinforcing bar connector using a
binding end member comprising: a first reinforcing bar and a second
reinforcing bar abutting each other while having end portions
facing each other; a first binding end member bound to the end
portion of the first reinforcing bar and having a male screw
portion for coupling a fastening socket formed in the longitudinal
direction at an outer surface thereof; a second binding end member
having one end portion formed of a shape corresponding to a shape
of an end portion of the first binding end member and the other end
portion bound to the end portion of the second reinforcing bar and
spaced apart from the one end portion, and having one or a
plurality of steps with one end portion in the axial direction
forming any one angle selected from an acute angle, a right angle,
and an obtuse angle with respect to the longitudinal direction; and
a hollow fastening socket opened in the longitudinal direction to
extend in the longitudinal direction to surround and accommodate an
outer surface of the second binding end member and an outer surface
of the first binding end member, having a female screw portion for
coupling a fastening socket that is helically coupled to the male
screw portion for coupling a fastening socket of the first binding
end member formed in the longitudinal direction at an inner surface
thereof, locked to the one or the plurality of steps of the second
binding end member, and having one or a plurality of locking steps
forming any one angle selected from an acute angle, a right angle,
and an obtuse angle with respect to the longitudinal direction,
wherein the fastening socket is moved forward toward the first
binding end member and rotated in a fastening tightening screw
direction such that locking steps of the fastening socket are
tightly supported by the second binding end member to allow the
first binding end member and the second binding end member to be
integrally fastened by the fastening socket in order to
mechanically join the first reinforcing bar and the second
reinforcing bar, a shape of the first binding end member bound to
the end portion of the first reinforcing bar is a shape in which
one end portion is a bar material shape having a width equal or
similar to that of the first reinforcing bar and a transverse
cross-sectional surface formed in a circular shape in order to have
a structure joined to the first reinforcing bar and the other end
portion is a bar material shape having a more extended width than
the bar material shape of the one end portion and having the male
screw portion for coupling a fastening socket formed at the
extended outer surface to have a width that is a sum of an extended
bar material shape of the second binding end member and a height of
a screw thread in order to be a bar material shape extended by the
width being stepped near the end portion in the longitudinal
direction, a shape of the second binding end member bound to the
end portion of the second reinforcing bar is a shape in which one
end portion is a bar material shape having a width equal or similar
to that of the second reinforcing bar and a transverse
cross-sectional surface formed in a circular shape in order to have
a structure joined to the second reinforcing bar and the other end
portion is a bar material shape having a more extended width than
the bar material shape of the one end portion but being formed in a
smaller width than an inner surface of the fastening socket to
allow the fastening socket to move at an outer surface and having a
step in a form of a protruding band that surrounds the outer
surface to be extended by the width being stepped near the step,
the step in the form of a protruding band is in the shape of a
protruding band surrounding from a portion near the bar material
shape in which the width of the second binding end member is
extended up to an end surface of the second binding end member or
forms a shape of a protruding band that surrounds the portion near
the bar material shape in which the width of the second binding end
member is extended while having a shortened width, the inner
surface of the fastening socket is a cylindrical shape having a
circumference to be rotatable in the fastening tightening screw
direction while having the longitudinal direction as an axis in
order to surround the bar material shape in which the width of the
second binding end member is extended and be movably coupled to the
outer surface of the second binding end member, and a locking step
protruding in a central direction in the shape of a protruding band
is included at an opposite end portion of the female screw portion
for coupling the fastening socket of the inner surface of the
fastening socket to be locked to the one or the plurality of steps
of the second binding end member, and the female screw portion for
coupling the fastening socket is formed at a portion near the end
portion in the first binding end member direction at the inner
surface of the fastening socket such that the fastening socket
formed to surround the bar material shape in which the width of the
second binding end member is extended and the bar material shape in
which the width of the first binding end member is extended is
helically fastened to the male screw portion for coupling the
fastening socket of the bar material shape in which the width of
the first binding end member is extended and the locking step and
the step in the shape of the protruding band tightly support each
other at the same time to allow the end portion of the extended bar
material shape of the first binding end member at which the male
screw portion for coupling the fastening socket is formed and the
end portion of the extended bar material shape of the second
binding end member to be integrally coupled while supporting and
facing each other.
2. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein, when adjustment
of a joining length of the first reinforcing bar and the second
reinforcing bar is required in any one case selected from a case in
which a middle binding member is interposed between the first
binding end member and the first reinforcing bar and a case in
which the middle binding member is interposed between the second
binding end member and the second reinforcing bar, the middle
binding member is installable.
3. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein middle binding
members are interposed between the first binding end member and the
first reinforcing bar and between the second binding end member and
the second reinforcing bar such that the middle binding members are
installed in any case in which adjustment of the joining length of
the first reinforcing bar and the second reinforcing bar is
required.
4. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 2, wherein the middle binding
member is installable in any one case selected from: a case in
which the middle binding member is interposed between the first
binding end member and the first reinforcing bar such that one end
portion of the middle binding member is bound to the end portion of
the first reinforcing bar, a male screw portion for coupling the
middle binding member is formed in a predetermined section from the
one end portion to the other end portion, a middle binding member
accommodation groove that accommodates the middle binding member is
formed at an end portion of the first binding end member
corresponding to the middle binding member, a female screw portion
for coupling the middle binding member is formed at an inner
surface of the accommodation groove, one or a plurality of lock nut
bodies having a circular or polygonal cross-sectional shape are
formed at the middle binding member such that a position of the
middle binding member is lockable, and the end portion of the first
binding end member corresponding to the middle binding member is
formed as in one case selected from a case in which a transverse
cross-sectional surface from the end portion surface up to a
predetermined distance is formed in a circular shape, a case in
which the transverse cross-sectional surface is formed in a
polygonal shape, and a case in which one or more pairs of grip
surfaces facing each other are formed; and a case in which the
middle binding member is interposed between the second binding end
member and the second reinforcing bar such that the one end portion
of the middle binding member is bound to the end portion of the
second reinforcing bar, the male screw portion for coupling the
middle binding member is formed in a predetermined section from the
one end portion to the other end portion, the middle binding member
accommodation groove that accommodates the middle binding member is
formed at an end portion of the second binding end member
corresponding to the middle binding member, the female screw
portion for coupling the middle binding member is formed at the
inner surface of the accommodation groove, the one or the plurality
of lock nut bodies having a transverse cross-sectional surface
formed in a circular or polygonal shape are formed at the middle
binding member such that a position of the middle binding member is
lockable, and the end portion of the second binding end member
corresponding to the middle binding member is formed as in one case
selected from a case in which a transverse cross-sectional surface
from the end portion surface up to a predetermined distance is
formed in a circular shape, a case in which the transverse
cross-sectional surface is formed in a polygonal shape, and a case
in which one or more pairs of grip surfaces facing each other are
formed.
5. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 3, wherein the middle binding
member is installable in each of the cases by: the middle binding
member in the first reinforcing bar direction having one end
portion bound to the end portion of the first reinforcing bar, the
male screw portion for coupling the middle binding member being
formed in the predetermined section from the one end portion to the
other end portion, a first middle binding member accommodation
groove that accommodates the middle binding member being formed at
the end portion of the first binding end member corresponding to
the middle binding member, the female screw portion for coupling
the middle binding member being formed at an inner surface of the
accommodation groove, the one or the plurality of lock nut bodies
having the transverse cross-sectional surface formed in a circular
or polygonal shape being disposed at the middle binding member such
that a position of the middle binding member is lockable, and the
end portion of the first binding end member corresponding to the
middle binding member being formed as in any one case selected from
the case in which the transverse cross-sectional surface from the
end portion surface up to a predetermined distance is formed in the
circular shape, the case in which the transverse cross-sectional
surface is formed in the polygonal shape, and the case in which the
one or more pairs of grip surfaces facing each other are formed;
and the middle binding member in the second reinforcing bar
direction having one end portion bound to the end portion of the
second reinforcing bar, the male screw portion for coupling the
middle binding member being formed in a predetermined section from
the one end portion to the other end portion, a middle binding
member accommodation groove that accommodates the middle binding
member being formed at the end portion of the second binding end
member corresponding to the middle binding member, the female screw
portion for coupling the middle binding member being formed at the
inner surface of the accommodation groove, the one or the plurality
of lock nut bodies having a transverse cross-sectional surface
formed in a circular or polygonal shape being formed at the middle
binding member such that a position of the middle binding member is
lockable, and the end portion of the second binding end member
corresponding to the middle binding member being formed as in one
case selected from the case in which the transverse cross-sectional
surface from the end portion surface up to a predetermined distance
is formed in the circular shape, the case in which the transverse
cross-sectional surface is formed in the polygonal shape, and the
case in which the one or more pairs of grip surfaces facing each
other are formed.
6. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 2, wherein the middle binding
member is installable in any one case selected from: a case in
which the middle binding member is bound to the end portion of the
first reinforcing bar, the male screw portion for coupling the
middle binding member is formed in the predetermined section from
the one end portion to the other end portion of the middle binding
member, a connection unit is formed at the other end portion of the
first binding end member corresponding to the middle binding
member, a male screw portion for coupling a connection socket is
formed at the connection unit, the connection socket, which is a
longitudinal member and a hollow body having one side and the other
side opened, that connects the connection unit to the middle
binding member is disposed, and a female screw portion helically
coupled to the male screw portion for coupling the connection
socket and the male screw portion for coupling the middle binding
member is formed at an inner surface of the connection socket; and
a case in which the middle binding member is bound to the end
portion of the second reinforcing bar, the male screw portion for
coupling the middle binding member is formed in the predetermined
section from the one end portion to the other end portion of the
middle binding member, a connection unit is formed at the other end
portion of the second binding end member corresponding to the
middle binding member, a male screw portion for coupling a
connection socket is formed at the connection unit, the connection
socket, which is a longitudinal member and a hollow body having one
side and the other side opened, that connects the connection unit
to the middle binding member is disposed, and a female screw
portion helically coupled to the male screw portion for coupling
the connection socket and the male screw portion for coupling the
middle binding member is formed at an inner surface of the
connection socket.
7. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 3, wherein the middle binding
member is installable in each of the cases by: the middle binding
member being bound to the end portion of the first reinforcing bar,
the male screw portion for coupling the middle binding member being
formed in the predetermined section from the one end portion to the
other end portion of the middle binding member, a connection unit
being formed at the other end portion of the first binding end
member corresponding to the middle binding member, the male screw
portion for coupling the connection socket being formed at the
connection unit, the connection socket, which is a longitudinal
member and a hollow body having one side and the other side opened,
that connects the connection unit to the middle binding member
being disposed, and the female screw portion helically coupled to
the male screw portion for coupling the connection socket and the
male screw portion for coupling the middle binding member being
formed at an inner surface of the connection socket; and the middle
binding member being bound to the end portion of the second
reinforcing bar, the male screw portion for coupling the middle
binding member being formed in the predetermined section from the
one end portion to the other end portion of the middle binding
member, the connection unit being formed at the other end portion
of the second binding end member corresponding to the middle
binding member, the male screw portion for coupling the connection
socket being formed at the connection unit, the connection socket,
which is a longitudinal member and a hollow body having one side
and the other side opened, that connects the connection unit to the
middle binding member being disposed, and the female screw portion
helically coupled to the male screw portion for coupling the
connection socket and the male screw portion for coupling the
middle binding member being formed at the inner surface of the
connection socket.
8. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 6, wherein, in formation of
the connection socket, any one case selected from a case in which
an outer surface is spline-processed, a case in which the outer
surface is knurl-processed, a case in which a transverse
cross-section is formed in a circular shape, a case in which the
transverse cross-section is formed in a polygonal shape, and a case
in which one or more pairs of grip surfaces facing each other are
formed is adopted.
9. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein end portion shapes
of the first binding end member and the second binding end member
are any shapes selected from: a shape in which the end portion
shape of the first binding end member is a protruding portion
formed in the longitudinal direction and the end portion shape of
the second binding end member is an accommodation unit formed in
the same shape as the protruding portion to have the protruding
portion fitted thereto; and a shape in which the end portion shape
of the second binding end member is a protruding portion formed in
the longitudinal direction and the end portion shape of the first
binding end member is an accommodation unit formed in the same
shape as the protruding portion to have the protruding portion
fitted thereto, and the end portion shapes of the first binding end
member and the second binding end member are exchangeable with each
other.
10. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein the end portion
shapes of the first binding end member and the second binding end
member are any shapes selected from: a shape in which the end
portion shape of the first binding end member is any one selected
from a cone, a truncated cone, a rounded cone, a cylinder, a
polygonal pyramid, a truncated polygonal pyramid, a rounded
polygonal pyramid, a polygonal column, a cut spherical shape, and a
cut elliptical-spherical shape protruding from the center in the
longitudinal direction, and a flat surface and an embossed surface
perpendicular to the longitudinal direction, and the end portion
shape of the second binding end member is an accommodation unit of
the end portion shape of the first binding end member that is
formed in the same shape as the end portion shape of the first
binding end member; and a shape in which the end portion shape of
the second binding end member is any one selected from a cone, a
truncated cone, a rounded cone, a cylinder, a polygonal pyramid, a
truncated polygonal pyramid, a rounded polygonal pyramid, a
polygonal column, a cut spherical shape, and a cut
elliptical-spherical shape protruding from the center in the
longitudinal direction, and a flat surface and an embossed surface
perpendicular to the longitudinal direction, and the end portion
shape of the first binding end member is an accommodation unit of
the end portion shape of the second binding end member that is
formed in the same shape as the end portion shape of the second
binding end member, and the end portion shapes of the first binding
end member and the second binding end member are exchangeable with
each other.
11. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein the end portion
shapes of the first binding end member and the second binding end
member are any shapes selected from: a shape in which the end
portion shape of the first binding end member is a multi-step
inclined type protruding portion having one or a plurality of
sections in which a surface area gradually decreases and sections
in which a surface area is constant in the longitudinal direction
and the end portion shape of the second binding end member is an
accommodation unit formed in a shape corresponding to the
protruding portion; and a shape in which the end portion shape of
the second binding end member is a multi-step inclined type
protruding portion having one or a plurality of sections in which a
surface area gradually decreases and sections in which a surface
area is constant in the longitudinal direction and the end portion
shape of the first binding end member is an accommodation unit
formed in a shape corresponding to the protruding portion, and the
end portion shapes of the first binding end member and the second
binding end member are exchangeable with each other.
12. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 10, wherein the embossed
surface is formed of: a convex portion having one or a plurality of
any one selected from a longitudinal cross-sectional surface formed
in a triangular shape, a triangular shape with a round vertex, a
quadrangular shape, a quadrangular shape with a round edge angle, a
cut spherical shape, a cut elliptical-spherical shape, a cross
shape formed at an end portion surface, a shape in which a cross
shape and a circular shape are combined, and a corrugated shape
curved in a wave form, all of which are equidistant from the center
of the end portion surface; and a concave portion formed in a shape
accommodating the convex portion.
13. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 10, wherein a longitudinal
cross-section of any one selected from the end portion shapes of
the first binding end member and the second binding end member
forming a cone, a truncated cone, a rounded cone, a cylinder, a
polygonal pyramid, a truncated polygonal pyramid, a rounded
polygonal pyramid, a polygonal column, a cut spherical shape, and a
cut elliptical-spherical shape is formed to form multiple stages;
and an angle formed by the multiple stages is any one angle
selected from an acute angle, a right angle, and an obtuse
angle.
14. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein the locking steps
and the steps are disposed in a plurality and formed in multiple
stages to distribute stress caused by a tensile force concentrated
to the fastening socket; and an angle formed by the locking steps
and the steps is any one angle selected from an acute angle, a
right angle, and an obtuse angle.
15. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein the sizes of the
first reinforcing bar and the second reinforcing bar are
different.
16. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein, in formation of
the fastening socket, any one case selected from a case in which an
outer surface is spline-processed, a case in which the outer
surface is knurl-processed, a case in which a transverse
cross-section is formed in a circular shape, a case in which the
transverse cross-section is formed in a polygonal shape, and a case
in which one or more pairs of grip surfaces facing each other are
formed is adopted.
17. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein joining of
adjacent bar materials having end portions facing each other is
possible by any one case selected from: a case in which the first
binding end member and the second binding end member are
respectively bound to the end portions of the bar materials; a case
in which the first binding end member and the middle binding member
are respectively bound to one side and the other side of the end
portions of the bar materials; and a case in which the second
binding end member and the middle binding member are respectively
bound to one side and the other side of the end portions of the bar
materials.
18. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein at least one
selected from the male screw portion for coupling the fastening
socket, the female screw portion for coupling the fastening socket,
the male screw portion for coupling the middle binding member, the
female screw portion for coupling the middle binding member, a
female screw portion for coupling the threaded joint type
reinforcing bar, the female screw portion for coupling the
reinforcing bar in which a male screw portion is formed at an end
portion, the male screw portion for connecting the connection
socket, and the female screw portion at the inner surface of the
connection socket is formed with one or more screw threads; a form
of a screw is any one form selected from a triangular screw, a
quadrangular screw, an elliptical screw, and a round screw; and a
class of a screw is any one selected from first class, second
class, and third class.
19. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein binding between
the first reinforcing bar and the first binding end member, binding
between the second reinforcing bar and the second binding end
member, binding between the first reinforcing bar and the middle
binding member, and binding between the second reinforcing bar and
the middle binding member are performed by welding.
20. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein the binding
between the first reinforcing bar and the first binding end member,
the binding between the second reinforcing bar and the second
binding end member, the binding between the first reinforcing bar
and the middle binding member, and the binding between the second
reinforcing bar and the middle binding member are performed by any
one selected from friction welding, linear friction welding, arc
stud welding method, butt welding, ultrasonic vibration welding,
resistance welding, plasma welding, electronic beam welding, laser
welding, high-frequency welding, and argon welding.
21. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 20, wherein, when the binding
is performed by the arc stud welding method, an ignition tip is
inserted and installed at a center of an end portion surface of the
first binding end member or the second binding end member to be
welded.
22. The socket-fastening-type reinforcing bar connector using a
binding end member according to claim 1, wherein a protective cap
for protecting screw threads covers at least one selected from the
male screw portion for coupling the fastening socket, the female
screw portion for coupling the fastening socket, the male screw
portion for coupling the middle binding member, the female screw
portion for coupling the middle binding member, the female screw
portion for coupling the threaded joint type reinforcing bar, the
female screw portion for coupling the reinforcing bar in which the
male screw portion is formed at the end portion, the male screw
portion for connecting the connection socket, and the female screw
portion at the inner surface of the connection socket.
Description
TECHNICAL FIELD
[0001] The present invention relates to a socket-fastening-type
reinforcing bar connector using a binding end member, and more
particularly, to a reinforcing bar connector capable of precisely
connecting reinforcing bars having adjacent ends mechanically
through simple socket fastening by binding end members bound to the
reinforcing members in order to facilitate joining of reinforcing
bars that form a foundation of reinforced concrete and joining of
reinforcing bar cages.
BACKGROUND ART
[0002] Generally, in a reinforced concrete work using an
arrangement of a plurality of reinforcing bars, a footing bar
arrangement work of reinforced concrete based on joining of
reinforcing bars and reinforcing bar cages is performed using a
technical configuration in which binding reinforcing bars are
attached to end portions of reinforcing bars or the joining is
facilitated by screw processing in order to join the reinforcing
bars.
[0003] A method of mechanically joining reinforcing bars and adding
tension to reinforcing bars is disclosed in Japanese Patent No.
4029342. That is, mechanical reinforcing bar joiners fixed to end
portions of adjacent reinforcing bars facing each other and each
formed of a head portion including a forward screw and a reverse
screw, a coupler coupled to the head portion, and a nut coming in
contact with the coupler to fasten the coupler, wherein a forward
screw is formed at one end portion of an inner circumferential
surface of the coupler and a reverse screw is formed at the other
end portion thereof to form screw surfaces corresponding to the
screw of the head portion, are disclosed.
[0004] However, in the above-mentioned reinforcing bar joiners, a
method in which, after the head portions are bound to both end
portions of a reinforcing bar, all of the couplers fastened to the
head portions bound to both of the end portions are helically
coupled to both of the end portions of the reinforcing bars to be
joined similarly to a coupling method using a turnbuckle is used.
Thus, when a work of connecting a series of main reinforcing bars
of upper and lower reinforcing bar cages is performed, main
reinforcing bars of the upper reinforcing bar cage entirely come in
contact with main reinforcing bars of the lower reinforcing bar
cage to be fastened thereto by a screw coupling method using
couplers when the reinforcing bar cages are lowered after being
hung and lifted from the ground by lifting equipment. However, due
to a difficulty of precisely aligning start points and end points
of screw threads of end portions of the main reinforcing bars, the
fastening work has to be performed strenuously and forcibly by
repetitively lifting and placing the upper reinforcing bars, thus
causing a problem. That is, since separate fastening works with
respect to each of the couplers are possible but a work of aligning
screw threads is difficult in the work of fastening reinforcing bar
cages which are a prefabricated reinforcing bar network, female
screw threads of the couplers to be fastened are formed wider than
male screw threads thereof to improve processability of screw
coupling, thus causing a wide gap between the fastened screw
threads of the couplers and making it impossible for the connection
using the couplers to be sturdy. To resolve these problems, inlets
are formed at predetermined points near the centers of the couplers
and grout filler such as mortar having one fifth to one tenth the
stiffness of a metal material are injected into the gaps between
the screw threads through the inlets in order to improve the
connection strength.
[0005] In addition, a reinforcing bar connector using a screw type
sleeve is disclosed in Korean Patent No. 10-1014543. That is, a
reinforcing bar connector using a screw type sleeve including one
sleeve having a female screw portion formed at an inner surface and
a male screw portion formed at an outer surface, the other sleeve
having a female screw portion formed at an inner surface and a
first locking step having one end portion formed of a parallel
surface perpendicular to a central axis line formed in the axial
direction, a fastening socket having a female screw portion
fastened by a screw to the male screw portion of the one sleeve
formed at an inner surface and a locking step protruding in a
circular central direction formed at an inner surface of one end
portion to perform locking while coming in contact with the first
locking step of the other sleeve, and a reinforcing bar having a
male screw portion formed at an end portion to be fastened by a
screw to the female screw portions of the two sleeves is
disclosed.
[0006] However, in the reinforcing bar connector using a screw type
sleeve, a method in which reinforcing bars are joined by couplers
after male screw processing is necessarily performed at end
portions of the reinforcing bars is used, but problems related to
the method of performing the male screw processing at the end
portions of the reinforcing bars are appearing, and some developed
countries are already regulating and prohibiting the method of
joining reinforcing bars by screwing end portions of the
reinforcing bars.
[0007] In other words, due to an inevitable requirement of highly
stiff reinforcing bars in accordance with heightening and
earthquake-resistant designs of buildings, the stiffness of
conventional reinforcing bars has been gradually strengthened from
SD400 to SD600 and even SD800 reinforcing bars are being
manufactured and used, and SD600-level reinforcing bars have also
been already commercialized domestically.
[0008] However, in a process of performing swaging screw processing
and inflation screw processing on end portions of highly stiff
reinforcing bars, problems in which a texture of reinforcing bars
changes and a texture strength of adjacent end portions being
annealed declines due to heat occur when a reinforcing bar texture
of the end portions is hot-processed, and ductility of the texture
declines when the reinforcing bar texture is cold-cut-processed,
and in accordance with a problem of cutting a fiber texture of
reinforcing bars in accordance with the cutting in screw
processing, a screw portion with a relatively declined texture
strength with respect to the reinforcing bars is processed, thus
causing poor joining.
[0009] In addition, when cold forging is performed, stiffness of a
surface portion of a cross-sectional surface of a texture of a
reinforcing bar is high while stiffness of a central portion
thereof declines, thus causing an external stiff texture to be
pushed into an inner portion when the cold-processing treatment is
performed and causing a great concern of slight crystal breakage.
Also, when screw threads are rolled, wear of a rolling roller
increases due to highly stiff reinforcing bars, thus causing loss
of expenditure by shortening a life of a consumed tool.
[0010] Consequently, for the highly stiff reinforcing bars, a
special welding method of melting and welding end portions of the
highly stiff reinforcing bars is being practically used. This
method includes forming a member having stiffness that is the same
as or higher than that of the highly stiff reinforcing bars and
instantly binding the member to the end portions of the highly
stiff reinforcing bars, thus preventing deformation of base
material.
[0011] Furthermore, with respect to joining reinforcing bars
screw-processed in the same direction at both end portions, even in
a method of joining the reinforcing bars at both of the end
portions by forming screws in the same direction at sleeve-shaped
couplers having screw threads formed at inner circumferential
surfaces coupled to end portions of the reinforcing bars, there is
an inconvenience of having to perform a construction work by
rotating the reinforcing bars while the reinforcing bars at both of
the end portions abut each other to be joined.
DISCLOSURE
Technical Problem
[0012] First, a main objective of the present invention is to
enable joining of reinforcing bars by integrated coupling with only
a simple element by an independent connector that may be bound to
an end portion of a reinforcing bar.
[0013] In addition, another objective of the present invention is
to firmly join reinforcing bars without a work of aligning centers
of the reinforcing bars or a work of aligning screw threads by
rotating the reinforcing bars even when end portions of the
reinforcing bars to be joined are fixed.
[0014] In addition, another objective of the present invention is
to enable end portions of main reinforcing bars of upper and lower
reinforcing bar cages to abut each other to be tightly fitted by
being naturally guided when the end portions of the main
reinforcing bars to be joined of each of the reinforcing bar cages
are not uniform during assembly of the reinforcing bar cages.
[0015] In addition, still another objective of the present
invention is to distribute stress from axial compressive force
after end portions of a first binding end member and a second
binding end member are fitted to abut each other.
[0016] In addition, still another objective of the present
invention is to enable reinforcing bars to be joined even when the
reinforcing bars to be joined are prearranged, when end portion
shapes of a first binding end member and a second binding end
member cannot abut each other because intervals between the
reinforcing bars in coupling reinforcing bar cages are too large or
non-uniform, or when a construction error of arranged reinforcing
bars occurs.
[0017] In addition, still another objective of the present
invention is to enable joining of reinforcing bars in which end
portions of a first threaded joint type reinforcing bar and a
second threaded joint type reinforcing bar abut and tightly support
each other.
[0018] In addition, still another objective of the present
invention is to completely eliminate an initial slip from a state
in which a first reinforcing bar and a second reinforcing bar are
joined by only fastening using a fastening socket.
[0019] In addition, still another objective of the present
invention is to allow length adjustment in joining reinforcing bars
to enable reinforcing bars with end portions spaced apart from each
other to be joined in a more extended range or absorb a
construction error by a configuration in which a middle binding
member and a binding end member are coupled.
[0020] In addition, still another objective of the present
invention is to facilitate arc generation in binding of the first
binding end member to the second binding end member and the first
reinforcing bar to the second reinforcing bar using a stud welding
method.
[0021] In addition, still another objective of the present
invention is to enable joining of reinforcing bars when sizes of
the reinforcing bars are different and the reinforcing bars are of
different types.
[0022] In addition, still another objective of the present
invention is to enable joining of bar materials including round
bars capable of not only joining reinforcing bars but also joining
binding portions.
Technical Solution
[0023] To achieve the above objectives, a socket-fastening-type
reinforcing bar connector using a binding end member according to
the present invention includes a first reinforcing bar and a second
reinforcing bar abutting each other while having end portions
facing each other, a first binding end member bound to the end
portion of the first reinforcing bar and having a male screw
portion for coupling a fastening socket formed in the longitudinal
direction at an outer surface thereof, a second binding end member
having one end portion formed of a shape corresponding to a shape
of an end portion of the first binding end member and the other end
portion bound to the end portion of the second reinforcing bar and
spaced apart from the one end portion, and having one or a
plurality of steps with one end portion in the axial direction
forming any one angle selected from an acute angle, a right angle,
and an obtuse angle with respect to the longitudinal direction, and
a hollow fastening socket opened in the longitudinal direction to
extend in the longitudinal direction to surround and accommodate an
outer surface of the second binding end member and an outer surface
of the first binding end member, having a female screw portion for
coupling a fastening socket that is helically coupled to the male
screw portion for coupling a fastening socket of the first binding
end member formed in the longitudinal direction at an inner surface
thereof, locked to the one or the plurality of steps of the second
binding end member, and having one or a plurality of locking steps
forming any one angle selected from an acute angle, a right angle,
and an obtuse angle with respect to the longitudinal direction,
wherein the fastening socket is moved forward toward the first
binding end member and rotated in a fastening tightening screw
direction such that the locking steps of the fastening socket are
tightly supported by the steps of the second binding end member to
allow the first binding end member and the second binding end
member to be integrally fastened by the fastening socket in order
to mechanically join the first reinforcing bar and the second
reinforcing bar, a shape of the first binding end member bound to
the end portion of the first reinforcing bar is a shape in which
one end portion is a bar material shape having a width equal or
similar to that of the first reinforcing bar and a transverse
cross-sectional surface formed in a circular shape in order to have
a structure joined to the first reinforcing bar and the other end
portion is a bar material shape having a more extended width than
the bar material shape of the one end portion and having the male
screw portion for coupling a fastening socket formed at the
extended outer surface to have a width that is a sum of a width of
an extended bar material shape of the second binding end member and
a height of a screw thread in order to be a bar material shape
extended by the width being stepped near the end portion along the
longitudinal direction, a shape of the second binding end member
bound to the end portion of the second reinforcing bar is a shape
in which one end portion is a bar material shape having a width
equal or similar to that of the second reinforcing bar and a
transverse cross-sectional surface formed in a circular shape in
order to have a structure joined to the second reinforcing bar and
the other end portion is a bar material shape having a more
extended width than the bar material shape of the one end portion
but being formed in a smaller width than an inner surface of the
fastening socket to allow the fastening socket to move at an outer
surface and having a step in a form of a protruding band that
surrounds the outer surface to be extended by the width being
stepped near the step, the step in the form of a protruding band is
in the shape of a protruding band surrounding from a portion near
the bar material shape in which the width of the second binding end
member is extended up to an end surface of the second binding end
member or forms a shape of a protruding band that surrounds the
portion near the bar material shape in which the width of the
second binding end member is extended while having a shortened
width, the inner surface of the fastening socket is a cylindrical
shape having a circumference to be rotatable in the fastening
tightening screw direction while having the longitudinal direction
as an axis in order to surround the bar material shape in which the
width of the second binding end member is extended and be movably
coupled to the outer surface of the second binding end member, a
locking step protruding toward a central direction in the shape of
a protruding band is included at an opposite end portion of the
female screw portion for coupling the fastening socket of the inner
surface of the fastening socket to be locked to the one or the
plurality of steps of the second binding end member, and the female
screw portion for coupling the fastening socket is formed at a
portion near the end portion in the first binding end member
direction at the inner surface of the fastening socket such that
the fastening socket formed to surround the bar material shape in
which the width of the second binding end member is extended and
the bar material shape in which the width of the first binding end
member is extended is helically fastened to the male screw portion
for coupling the fastening socket of the bar material shape in
which the width of the first binding end member is extended and the
locking step and the step in the shape of the protruding band
tightly support each other at the same time to allow the end
portion of the extended bar material shape of the first binding end
member at which the male screw portion for coupling the fastening
socket is formed and the end portion of the extended bar material
shape of the second binding end member to be integrally coupled
which supporting and facing each other.
[0024] In addition, when adjustment of a joining length of the
first reinforcing bar and the second reinforcing bar is required in
any one case selected from a case in which a middle binding member
is interposed between the first binding end member and the first
reinforcing bar and a case in which the middle binding member is
interposed between the second binding end member and the second
reinforcing bar, the middle binding member is installable.
[0025] In addition, the middle binding members are respectively
interposed between the first binding end member and the first
reinforcing bar and between the second binding end member and the
second reinforcing bar such that the middle binding members are
each installed in any case in which adjustment of the joining
length of the first reinforcing bar and the second reinforcing bar
is required.
[0026] In addition, the middle binding member is installable in any
one case selected from a case in which the middle binding member is
interposed between the first binding end member and the first
reinforcing bar such that one end portion of the middle binding
member is bound to the end portion of the first reinforcing bar, a
male screw portion for coupling the middle binding member is formed
in a predetermined section from the one end portion to the other
end portion, a middle binding member accommodation groove that
accommodates the middle binding member is formed at an end portion
of the first binding end member corresponding to the middle binding
member, a female screw portion for coupling the middle binding
member is formed at an inner surface of the accommodation groove,
one or a plurality of lock nut bodies having a circular or
polygonal cross-sectional shape are formed at the middle binding
member such that a position of the middle binding member is
lockable, and the end portion of the first binding end member
corresponding to the middle binding member is formed as in one case
selected from a case in which a transverse cross-sectional surface
from the end portion surface up to a predetermined distance is
formed in a circular shape, a case in which the transverse
cross-sectional surface is formed in a polygonal shape, and a case
in which one or more pairs of grip surfaces facing each other are
formed, and a case in which the middle binding member is interposed
between the second binding end member and the second reinforcing
bar such that the one end portion of the middle binding member is
bound to the end portion of the second reinforcing bar, the male
screw portion for coupling the middle binding member is formed in a
predetermined section from the one end portion to the other end
portion, the middle binding member accommodation groove that
accommodates the middle binding member is formed at an end portion
of the second binding end member corresponding to the middle
binding member, the female screw portion for coupling the middle
binding member is formed at the inner surface of the accommodation
groove, the one or the plurality of lock nut bodies having a
transverse cross-sectional surface formed in a circular or
polygonal shape are formed at the middle binding member such that a
position of the middle binding member is lockable, and the end
portion of the second binding end member corresponding to the
middle binding member is formed as in one case selected from a case
in which a transverse cross-sectional surface from the end portion
surface up to a predetermined distance is formed in a circular
shape, a case in which the transverse cross-sectional surface is
formed in a polygonal shape, and a case in which one or more pairs
of grip surfaces facing each other are formed.
[0027] In addition, the middle binding member is installable in
each of the cases by the middle binding member in the first
reinforcing bar direction having one end portion bound to the end
portion of the first reinforcing bar, the male screw portion for
coupling the middle binding member being formed in the
predetermined section from the one end portion to the other end
portion, a first middle binding member accommodation groove that
accommodates the middle binding member being formed at the end
portion of the first binding end member corresponding to the middle
binding member, the female screw portion for coupling the middle
binding member being formed at an inner surface of the
accommodation groove, the one or the plurality of lock nut bodies
having the transverse cross-sectional surface formed in a circular
or polygonal shape being disposed at the middle binding member such
that a position of the middle binding member is lockable, and the
end portion of the first binding end member corresponding to the
middle binding member being formed as in any one case selected from
the case in which the transverse cross-sectional surface from the
end portion surface up to a predetermined distance is formed in the
circular shape, the case in which the transverse cross-sectional
surface is formed in the polygonal shape, and the case in which the
one or more pairs of grip surfaces facing each other are formed,
and by the middle binding member in the second reinforcing bar
direction having one end portion bound to the end portion of the
second reinforcing bar, the male screw portion for coupling the
middle binding member being formed in a predetermined section from
the one end portion to the other end portion, a middle binding
member accommodation groove that accommodates the middle binding
member being formed at the end portion of the second binding end
member corresponding to the middle binding member, the female screw
portion for coupling the middle binding member being formed at the
inner surface of the accommodation groove, the one or the plurality
of lock nut bodies having a transverse cross-sectional surface
formed in a circular or polygonal shape being formed at the middle
binding member such that a position of the middle binding member is
lockable, and the end portion of the second binding end member
corresponding to the middle binding member being formed as in one
case selected from the case in which the transverse cross-sectional
surface from the end portion surface up to a predetermined distance
is formed in the circular shape, the case in which the transverse
cross-sectional surface is formed in the polygonal shape, and the
case in which the one or more pairs of grip surfaces facing each
other are formed.
[0028] In addition, the middle binding member is installable in any
one case selected from a case in which the middle binding member is
bound to the end portion of the first reinforcing bar, the male
screw portion for coupling the middle binding member is formed in
the predetermined section from the one end portion to the other end
portion of the middle binding member, a connection unit is formed
at the other end portion of the first binding end member
corresponding to the middle binding member, a male screw portion
for coupling a connection socket is formed at the connection unit,
the connection socket, which is a longitudinal member and a hollow
body having one side and the other side opened, that connects the
connection unit to the middle binding member is disposed, and a
female screw portion helically coupled to the male screw portion
for coupling the connection socket and the male screw portion for
coupling the middle binding member is formed at an inner surface of
the connection socket, and a case in which the middle binding
member is bound to the end portion of the second reinforcing bar,
the male screw portion for coupling the middle binding member is
formed in the predetermined section from the one end portion to the
other end portion of the middle binding member, a connection unit
is formed at the other end portion of the second binding end member
corresponding to the middle binding member, a male screw portion
for coupling a connection socket is formed at the connection unit,
the connection socket, which is a longitudinal member and a hollow
body having one side and the other side opened, that connects the
connection unit to the middle binding member is disposed, and a
female screw portion helically coupled to the male screw portion
for coupling the connection socket and the male screw portion for
coupling the middle binding member is formed at an inner surface of
the connection socket.
[0029] In addition, the middle binding member is installable in
each of the cases by the middle binding member being bound to the
end portion of the first reinforcing bar, the male screw portion
for coupling the middle binding member being formed in the
predetermined section from the one end portion to the other end
portion of the middle binding member, a connection unit being
formed at the other end portion of the first binding end member
corresponding to the middle binding member, the male screw portion
for coupling the connection socket being formed at the connection
unit, the connection socket, which is a longitudinal member and a
hollow body having one side and the other side opened, that
connects the connection unit to the middle binding member being
disposed, and the female screw portion helically coupled to the
male screw portion for coupling the connection socket and the male
screw portion for coupling the middle binding member being formed
at an inner surface of the connection socket, and by the middle
binding member being bound to the end portion of the second
reinforcing bar, the male screw portion for coupling the middle
binding member being formed in the predetermined section from the
one end portion to the other end portion of the middle binding
member, the connection unit being formed at the other end portion
of the second binding end member corresponding to the middle
binding member, the male screw portion for coupling the connection
socket being formed at the connection unit, the connection socket,
which is a longitudinal member and a hollow body having one side
and the other side opened, that connects the connection unit to the
middle binding member being disposed, and the female screw portion
helically coupled to the male screw portion for coupling the
connection socket and the male screw portion for coupling the
middle binding member being formed at the inner surface of the
connection socket.
[0030] In addition, in formation of the connection socket, any one
case selected from a case in which an outer surface is
spline-processed, a case in which the outer surface is
knurl-processed, a case in which a transverse cross-section is
formed in a circular shape, a case in which the transverse
cross-section is formed in a polygonal shape, and a case in which
one or more pairs of grip surfaces facing each other are formed is
adopted.
[0031] In addition, end portion shapes of the first binding end
member and the second binding end member may be any shapes selected
from a shape in which the end portion shape of the first binding
end member is a protruding portion formed in the longitudinal
direction and the end portion shape of the second binding end
member is an accommodation unit formed in the same shape as the
protruding portion to have the protruding portion fitted thereto
and a shape in which the end portion shape of the second binding
end member is a protruding portion formed in the longitudinal
direction and the end portion shape of the first binding end member
is an accommodation unit formed in the same shape as the protruding
portion to have the protruding portion fitted thereto, and the end
portion shapes of the first binding end member and the second
binding end member are exchangeable with each other.
[0032] In addition, the end portion shapes of the first binding end
member and the second binding end member may be any shapes selected
from a shape in which the end portion shape of the first binding
end member is any one selected from a cone, a truncated cone, a
rounded cone, a cylinder, a polygonal pyramid, a truncated
polygonal pyramid, a rounded polygonal pyramid, a polygonal column,
a cut spherical shape, and a cut elliptical-spherical shape
protruding from the center in the longitudinal direction, and a
flat surface and an embossed surface perpendicular to the
longitudinal direction, and the end portion shape of the second
binding end member is an accommodation unit of the end portion
shape of the first binding end member that is formed in the same
shape as the end portion shape of the first binding end member, and
a shape in which the end portion shape of the second binding end
member is any one selected from a cone, a truncated cone, a rounded
cone, a cylinder, a polygonal pyramid, a truncated polygonal
pyramid, a rounded polygonal pyramid, a polygonal column, a cut
spherical shape, and a cut elliptical-spherical shape protruding
from the center in the longitudinal direction, and a flat surface
and an embossed surface perpendicular to the longitudinal
direction, and the end portion shape of the first binding end
member is an accommodation unit of the end portion shape of the
second binding end member that is formed in the same shape as the
end portion shape of the second binding end member, and the end
portion shapes of the first binding end member and the second
binding end member are exchangeable with each other.
[0033] In addition, the end portion shapes of the first binding end
member and the second binding end member may be any shapes selected
from a shape in which the end portion shape of the first binding
end member is a multi-step inclined type protruding portion having
one or a plurality of sections in which a surface area gradually
decreases and sections in which a surface area is constant in the
longitudinal direction and the end portion shape of the second
binding end member is an accommodation unit formed in a shape
corresponding to the protruding portion, and a shape in which the
end portion shape of the second binding end member is a multi-step
inclined type protruding portion having one or a plurality of
sections in which a surface area gradually decreases and sections
in which a surface area is constant in the longitudinal direction
and the end portion shape of the first binding end member is an
accommodation unit formed in a shape corresponding to the
protruding portion, and the end portion shapes of the first binding
end member and the second binding end member are exchangeable with
each other.
[0034] In addition, the embossed surface may be formed of a convex
portion having one or a plurality of any one selected from a
longitudinal cross-sectional surface formed in a triangular shape,
a triangular shape with a round vertex, a quadrangular shape, a
quadrangular shape with a round edge angle, a cut spherical shape,
a cut elliptical-spherical shape, a cross shape formed at an end
portion surface, a shape in which a cross shape and a circular
shape are combined, and a corrugated shape curved in a wave form
all of which are equidistant from the center of the end portion
surface, and a concave portion formed in a shape accommodating the
convex portion.
[0035] In addition, a longitudinal cross-section of any one
selected from the end portion shapes of the first binding end
member and the second binding end member forming a cone, a
truncated cone, a rounded cone, a cylinder, a polygonal pyramid, a
truncated polygonal pyramid, a rounded polygonal pyramid, a
polygonal column, a cut spherical shape, and a cut
elliptical-spherical shape is formed to form multiple stages, and
an angle formed by the multiple stages is any one angle selected
from an acute angle, a right angle, and an obtuse angle.
[0036] In addition, the locking steps and the steps are disposed in
a plurality and formed in multiple stages to distribute stress
caused by a tensile force concentrated to the fastening socket, and
an angle formed by the locking steps and the steps is any one angle
selected from an acute angle, a right angle, and an obtuse
angle.
[0037] In addition, the sizes of the first reinforcing bar and the
second reinforcing bar are different.
[0038] In addition, in formation of the fastening socket, any one
case selected from a case in which an outer surface is
spline-processed, a case in which the outer surface is
knurl-processed, a case in which a transverse cross-section is
formed in a circular shape, a case in which the transverse
cross-section is formed in a polygonal shape, and a case in which
one or more pairs of grip surfaces facing each other are formed is
adopted.
[0039] In addition, joining of adjacent bar materials having end
portions facing each other is possible by any one case selected
from a case in which the first binding end member and the second
binding end member are respectively bound to the end portions of
the bar materials, a case in which the first binding end member and
the middle binding member are respectively bound to one side and
the other side of the end portions of the bar materials, a case in
which the second binding end member and the middle binding member
are respectively bound to one side and the other side of the end
portions of the bar materials, and a case in which the end portions
of the bar materials are screw-processed to be respectively
helically coupled to the first binding end member and the second
binding end member.
[0040] In addition, at least one selected from the male screw
portion for coupling the fastening socket, the female screw portion
for coupling the fastening socket, the male screw portion for
coupling the middle binding member, the female screw portion for
coupling the middle binding member, a female screw portion for
coupling the threaded joint type reinforcing bar, the female screw
portion for coupling the reinforcing bar in which a male screw
portion is formed at an end portion, the male screw portion for
connecting the connection socket, and the female screw portion at
the inner surface of the connection socket is formed with one or
more screw threads, a form of a screw is any one form selected from
a triangular screw, a quadrangular screw, an elliptical screw, and
a round screw, and a class of a screw is any one selected from
first class, second class, and third class.
[0041] In addition, binding between the first reinforcing bar and
the first binding end member, binding between the second
reinforcing bar and the second binding end member, binding between
the first reinforcing bar and the middle binding member, and
binding between the second reinforcing bar and the middle binding
member are performed by welding.
[0042] In addition, the binding between the first reinforcing bar
and the first binding end member, the binding between the second
reinforcing bar and the second binding end member, the binding
between the first reinforcing bar and the middle binding member,
and the binding between the second reinforcing bar and the middle
binding member are performed by any one selected from friction
welding, linear friction welding, arc stud welding method, butt
welding, ultrasonic vibration welding, resistance welding, plasma
welding, electronic beam welding, laser welding, high-frequency
welding, and argon welding.
[0043] In addition, when the binding is performed by the arc stud
welding method, an ignition tip is inserted and installed at a
center of an end portion surface of the first binding end member or
the second binding end member to be welded.
[0044] In addition, a protective cap for protecting screw threads
may cover at least one selected from the male screw portion for
coupling the fastening socket, the female screw portion for
coupling the fastening socket, the male screw portion for coupling
the middle binding member, the female screw portion for coupling
the middle binding member, the female screw portion for coupling
the threaded joint type reinforcing bar, the female screw portion
for coupling the reinforcing bar in which the male screw portion is
formed at the end portion, the male screw portion for connecting
the connection socket, and the female screw portion at the inner
surface of the connection socket.
Advantageous Effects
[0045] A socket-fastening-type reinforcing bar connector using a
binding end member of the present invention having a first binding
end member, a second binding end member, and a fastening socket
performing integral fastening is an independent connector capable
of being bound to an end portion of a reinforcing bar that enables
joining of reinforcing bars by integrated coupling with only a
simple element.
[0046] In addition, constructability is superior since a work of
aligning centers of reinforcing bars or a work of aligning screw
threads by rotating the reinforcing bars as in other methods of
joining reinforcing bars are not required even when end portions of
the reinforcing bars to be joined are fixed, and a constructor may
complete firm joining of reinforcing bars by simply moving and
rotating a fastening socket in a fastening direction.
[0047] In addition, when end portions of reinforcing bar cages of a
prefabricated reinforcing bar network to be joined by end portion
shapes forming a cone, a truncated cone, a rounded cone, a
cylinder, a polygonal pyramid, a truncated polygonal pyramid, a
rounded polygonal pyramid, a polygonal column, a cut spherical
shape, and a cut elliptical-spherical shape and accommodation units
of the shapes are not uniform, vertices of end portion shapes of
binding end members bound to a plurality of main reinforcing bars
that have come in contact at once come in contact with
predetermined points of the accommodation units formed in the same
shape as the end portions of the binding end members bound to end
portions of the plurality of main reinforcing bars at a lower
portion to be naturally guided for the upper and lower reinforcing
bar cages to abut each other to be tightly fitted.
[0048] In addition, when a longitudinal cross-section of any one
selected from end portion shapes forming a cone, a truncated cone,
a rounded cone, a cylinder, a polygonal pyramid, a truncated
polygonal pyramid, a rounded polygonal pyramid, a polygonal column,
a cut spherical shape, and a cut elliptical-spherical shape is
formed to form multiple stages, a contact area increases after the
end portions of the first binding end member and the second binding
end member are fitted to abut each other, causing an effect of
distributing stress from the axial compressive force.
[0049] In addition, when reinforcing bars to be joined are
prearranged and end portion shapes of a first binding end member
and a second binding end member cannot abut each other because
intervals between reinforcing bars in coupling reinforcing bar
cages are too large or non-uniform, or when a construction error of
arranged reinforcing bars occurs, joining the reinforcing bars is
enabled by enabling positions to be adjusted such that the end
portion shapes of the first binding end member and the second
binding end member abut each other to be tightly fitted or
absorbing the construction error by interposing a middle binding
member and rotating the first binding member or the second binding
end member inserted into the middle binding member by a screw to be
moved back and forth.
[0050] In addition, the first middle binding member and the second
middle binding member are inserted into end portions of the first
threaded joint type reinforcing bar and the second threaded joint
type reinforcing bar to be completely fastened by the fastening
socket such that the end portions of the first threaded joint type
reinforcing bar and the second threaded joint type reinforcing bar
abut and tightly support each other, thereby enabling reinforcing
bars that come in close contact and are supported in the
longitudinal direction to be stably joined.
[0051] In addition, since the end portions of the first reinforcing
bar and the second reinforcing bar abut and tightly support each
other using only the fastening socket, and are integrally connected
by fastening using the fastening socket while the end portions that
abut and tightly support each other are tightly supported, there is
no movement of the reinforcing bars, and thus an initial slip is
completely eliminated.
[0052] In addition, by forming a configuration in which the
connection unit and the male screw portion are formed at the first
binding end member and the second binding end member, end portion
shapes of the first binding end member and the second binding end
member spaced further apart may be adjusted to abut each other
because it is possible to adjust a joining length in an extended
range using the connection unit and to adjust a length of
reinforcing bars in a more extended range and absorb a construction
error using the connection unit.
[0053] In addition, to facilitate arc generation, a groove is
formed at a center of an end portion surface of a binding end
member to be welded to insert and install an ignition tip that
performs ignition to ignite the arc at the center of the end
portion surface of the binding end member such that melting from
the central portion occurs due to ignition of the arc generation
from the center of the end portion surface even when the binding
end member is wide, thereby obtaining a high-quality welding
surface.
[0054] In addition, even when sizes of the first reinforcing bar
and the second reinforcing bar or the first threaded joint type
reinforcing bar and the second threaded joint type reinforcing bar
are different and in a method of joining reinforcing bars of
different types, joining is possible by simply binding the first
binding end member and the second binding end member to end
portions.
[0055] In addition, with respect to bar materials including round
bars capable of not only joining reinforcing bars but also joining
binding portions, adjacent bar materials having end portions facing
each other can be joined by the first binding end member, the
second binding end member, and the middle binding end member, which
can be bound even to the end portions of the bar materials
according to an embodiment.
DESCRIPTION OF DRAWINGS
[0056] FIG. 1 is a perspective view illustrating an assembly shape
according to the present invention.
[0057] FIG. 2 is a cross-sectional view illustrating connection of
reinforcing bars according to a first embodiment of the present
invention in detail.
[0058] FIG. 3 is a cross-sectional view illustrating connection of
reinforcing bars according to a second embodiment of the present
invention in detail.
[0059] FIG. 4 is a cross-sectional view illustrating connection of
reinforcing bars according to a third embodiment of the present
invention in detail.
[0060] FIG. 5 is a cross-sectional view illustrating connection of
reinforcing bars according to a fourth embodiment of the present
invention in detail.
[0061] FIG. 6 is a cross-sectional view illustrating connection of
reinforcing bars according to a fifth embodiment of the present
invention in detail.
[0062] FIG. 7 is a cross-sectional view illustrating connection of
reinforcing bars according to a sixth embodiment of the present
invention in detail.
[0063] FIG. 8 is a cross-sectional view illustrating connection of
reinforcing bars according to a seventh embodiment of the present
invention in detail.
[0064] FIG. 9 is a cross-sectional view illustrating a processing
recessed groove of the present invention in detail.
[0065] FIG. 10 is a cross-sectional view illustrating a plurality
of steps and locking portions of the present invention.
[0066] FIG. 11 is a cross-sectional view illustrating a case of the
present invention in which a protruding portion is formed at a
second binding end member and an accommodation unit is formed at a
first binding end member in detail.
[0067] FIGS. 12 to 14 are cross-sectional views illustrating end
portion shapes of the first binding end member and the second
binding end member of the present invention in detail.
[0068] FIGS. 15 and 16 are cross-sectional views illustrating
embossed surfaces of the first binding end member and the second
binding end member of the present invention in detail.
[0069] FIG. 17 is a cross-sectional view illustrating multi-staged
end surface shapes of the first binding end member and the second
binding end member of the present invention in detail.
[0070] FIG. 18 is a cross-sectional view illustrating a state in
which an ignition tip is inserted and installed at an end portion
surface of the first binding end member of the present invention in
detail.
[0071] FIG. 19 is a partially cut view illustrating joining of
reinforcing bars between upper and lower reinforcing bar cages
according to the first embodiment of the present invention in
detail.
[0072] FIG. 20 is a partially cut view illustrating joining of
reinforcing bars between upper and lower reinforcing bar cages
according to the second embodiment of the present invention in
detail.
MODES OF THE INVENTION
[0073] Hereinafter, a socket-fastening-type reinforcing bar
connector using a binding end member according to the present
invention will be described in detail with reference to the
accompanying drawings.
[0074] First, in this specification, a longitudinal cross-section
represents an end surface shape shown when cut in the longitudinal
direction of a reinforcing bar, and a transverse cross-section
represents an end surface portion shown when cut in a direction
orthogonal to the longitudinal direction of the reinforcing
bar.
[0075] In this specification, the same reference numerals are used
when and where possible, but the same elements may be represented
by different reference numerals for convenience in different
embodiments. Also, terms used in this specification are not
intended to limit the present invention and should be construed as
being used for convenience in describing the present invention.
[0076] First, FIG. 2 is a cross-sectional view illustrating
connection of reinforcing bars according to a first embodiment of
the present invention in detail.
[0077] The first embodiment according to the present invention
includes a first reinforcing bar 100, a second reinforcing bar 110,
a first binding end member 120, a second binding end member 130,
and a fastening socket 140.
[0078] First, two adjacent reinforcing bars having end portions
facing each other are the first reinforcing bar 100 and the second
reinforcing bar 110, and each of the reinforcing bars is a
reinforcing bar selected from a deformed reinforcing bar and a
threaded joint type reinforcing bar in accordance with each
embodiment.
[0079] First, the first binding end member 120, which is a
longitudinal member formed in the longitudinal direction of the
reinforcing bar, is bound to an end portion of the first
reinforcing bar 100, an end portion coupled to the first
reinforcing bar 100 may have a width of a cross-sectional area
similar to that of an outer surface of the first reinforcing bar
100 to form a joined structure, and an end portion shape in a
direction abutting the second binding end member 130 for joining
and connecting reinforcing bars may have a width of a
cross-sectional area adjusted as needed such that the width of the
cross-sectional area supports a tensile force.
[0080] A binding surface in a reinforcing bar direction of the
first binding end member 120 may preferably have an end portion
surface precisely cut-processed to be orthogonal to the
longitudinal direction of the reinforcing bar to increase quality
of the binding surface.
[0081] A male screw portion 121 for coupling the fastening socket
140 formed in the longitudinal direction is disposed at an outer
surface of the first binding end member 120. The male screw portion
121 is the male screw portion 121 for coupling the fastening socket
140 that is coupled to the fastening socket 140 to be described
below to be integrated with the fastening socket 140. A range of a
section in which the male screw portion is formed is formed of a
coupling length and size that enables joining by the fastening
socket 140. The range of the screw section preferably has a width
similar to that of a diameter of a transverse cross-sectional
surface of a reinforcing bar to be fastened. The screw portion may
have various shapes and classes for precise joining with the first
binding end member 120.
[0082] The second binding end member 130 abutting the first binding
end member 120 is a member extending in the longitudinal direction
as the first binding end member 120. The other end portion of the
second binding end member 130 is bound to an end portion of the
second reinforcing bar 110, one end portion thereof abuts the first
binding end member 120, and the abutting may be performed with
various shapes corresponding to the first binding end member 120. A
width of a transverse cross-section in the abutting direction of
the second binding end member 130 and a width of a transverse
cross-section in the abutting direction of the first binding end
member 120 are formed such that outer surfaces form a joined
structure in which the width of the binding end member at which the
male screw portion 121 for coupling the fastening socket 140 is
formed is preferably widely formed to be increased as much as the
height of screw threads.
[0083] In addition, a shape forming a step 131 is disposed apart
from one end portion of the second binding end member 130 with one
end portion in the axial direction, which is the longitudinal
direction perpendicular to the longitudinal direction. One or a
plurality of the steps 131 may be disposed, and a plurality of the
steps 131 are preferably disposed when the size of the reinforcing
bar to be joined is large.
[0084] Accordingly, the width of the second binding end member 130
forms a shape in which the width of the second reinforcing bar 110
to which the second binding end member 130 will be bound and the
width of the step 131 are added, and all of the widths of the
plurality of steps 131 are added when the plurality of steps 131
are disposed. The second binding end member 130 has a width similar
to that of the second reinforcing bar 110 to form a joined
structure while having a stepped shape near a middle portion by the
shape of the step 131.
[0085] After the end portions of the first binding end member 120
and the second binding end member 130 are made to abut each other,
in order for the abutting end portions to be sufficiently
accommodated into an inner surface of the fastening socket 140 for
fastening the first binding end member 120 and the second binding
end member 130 and for joining of the abutting end portions to be
firm after the accommodation, outer surfaces of the abutting end
portion shapes of the first binding end member 120 and the second
binding end member 130 closely come in contact with the inner
surface of the fastening socket 140.
[0086] Accordingly, the fastening socket 140 is formed in a hollow
shape with one side and the other side open, has the width of the
inner surface formed in a width accommodating the outer surfaces of
the first binding end member 120 and the second binding end member
130, and extends in the longitudinal direction such that the
abutting end portions of the first binding end member 120 and the
second binding end member 130 may be accommodated in the fastening
socket 140 even after the abutting end portions of the first
binding end member 120 and the second binding end member 130 are
locked to the step 131. Therefore, the fastening socket 140 extends
in the longitudinal direction to surround and accommodate all of
the outer surfaces of the first binding end member 120 and the
second binding end member 130, and a female screw portion 141
helically coupled to the male screw portion 121 for coupling the
fastening socket 140 at the outer surface of the first binding end
member 120 is formed at the inner surface of the fastening
socket.
[0087] In addition, one or a plurality of locking steps 142 formed
in a shape that may be locked to the step 131 of the second binding
end member 130 are formed at the inner surface of the fastening
socket 140 and the female screw portion is fastened to the male
screw portion 121 for coupling the fastening socket 140 of the
first binding end member 120 after the locking step 142 is locked
to the step 131 of the second binding end member 130, so that one
side of the fastening socket 140 is fixed by being supported by the
step 131 and the locking step 142 and the other side thereof is
fixed by coupling of the screw portions.
[0088] In order for the shapes of the step 131 and the locking step
142 to be tightly locked easily in the fastening process, surfaces
forming the step 131 and the locking step 142 may be formed in a
desired angle among an acute angle, a right angle, and an obtuse
angle with respect to the longitudinal direction of the fastening
socket 140. That is, when a longitudinal end surface shape of the
step 131 has an end portion surface toward a center in the
longitudinal direction formed to form an acute angle with the axial
direction and the shape of the locking step 142 locked to the step
131 is also formed in the same shape, locking by the surface formed
of an acute angle of the locking step 142 of the fastening socket
140 may occur more easily than when the surfaces forming the step
131 and the locking step 142 are formed with only a right angle as
the fastening socket 140 advances in the fastening direction in the
fastening process, and a surface area that is tightly supported
increases even after the locking, thereby enabling more firmly
integrated coupling.
[0089] For this, the fastening socket 140 is pre-coupled to the
second binding end member 130 before the second binding end member
130 is bound to the second reinforcing bar 110 to allow the
fastening socket 140 to be moved toward the first binding end
member 120 after the second binding end member 130 is bound to the
second reinforcing bar 110.
[0090] In a process of fastening with the above configuration, when
the first binding end member 120 is made to abut the end portion of
the second binding end member 130 after the second binding end
member 130 is bound to the second reinforcing bar 110, the
fastening socket 140 is moved forward toward the first binding end
member 120 and rotated in the fastening tightening screw direction
such that the locking step 142 of the fastening socket 140 comes in
close contact with and is supported by the step 131 of the second
binding end member 130 to allow the female screw portion and the
male screw portion to be coupled in order for the first binding end
member 120 and the second binding end member 130 to be integrally
fastened by the fastening socket 140.
[0091] The first binding end member 120, the second binding end
member 130, and the fastening socket 140 that perform the integral
fastening form an independent connector that may be bound to an end
portion of a reinforcing bar such that the integral fastening is
possible with only a simple element.
[0092] That is, due to the locking step 142 of the fastening socket
140 coming in complete contact with the step 131 to move while
pulling the second binding end member 130 as the fastening socket
140 is rotated in the coupling direction and the first binding end
member 120 and the second binding end member 130 being strongly
pulled while facing each other by the locking step 142 and the step
131, the end portion shapes of the first binding end member 120 and
the second binding end member 130 completely come in contact with
each other, and compressed fastening of the first binding end
member 120 and the second binding end member 130 is completed as
the fastening socket 140 is further rotated in the coupling
direction.
[0093] That is, constructability is superior since a work of
aligning centers of reinforcing bars or a work of aligning screw
threads by rotating the reinforcing bars as in other methods of
joining reinforcing bars is not required even when end portions of
the reinforcing bars to be joined are fixed, and a constructor may
complete firm joining of the reinforcing bars by simply moving and
rotating the fastening socket 140 in the fastening direction.
[0094] To describe the first binding end member 120, the second
binding end member 130, and the fastening socket 140, which are
elements of the embodiment in more detail, the binding end member,
which is divided into two and formed of the first binding end
member 120 and the second binding end member 130, is integrated
with the fastening socket 140 by being helically coupled to the
fastening socket 140, and two reinforcing bars are joined by
binding and integrating the first binding end member 120 and the
second binding end member 130 to the two reinforcing bars and
fastening the two binding end members by a screw using the
fastening socket 140.
[0095] First, for a width of the shape of the first binding end
member 120 to be the same as or similar to that of the shape of the
first reinforcing bar 100 to have a structure in which the first
binding end member 120 and the first reinforcing bar 100 are
joined, one end portion shape of the first binding end member 120
is a bar material shape having a transverse cross-sectional surface
formed in a circular shape and the other end portion shape thereof
is a bar material shape having a slightly larger width by extending
the width of the end portion shape to be formed similar to that of
the end portion shape of the second binding end member 130, and the
male screw portion 121 for coupling the fastening socket is formed
at the extended portion, thereby having a width that is a sum of
the width of the end portion shape of the second binding end member
130 and the height of a screw thread in order to be a bar material
shape extended by the width being stepped near the end portion in
the longitudinal direction.
[0096] That is, the width of the end portion of the first binding
end member 120 is formed larger than the width of the end portion
of the second binding end member 130 by the height of a screw
thread to be coupled to the fastening socket 140. Accordingly, the
first binding end member 120 becomes a bar material shape forming a
stepped structure at a portion near an end portion toward the
second reinforcing bar 110. Accordingly, due to the stepped
structure, the bar material shape having a width that is the same
as or similar to that of the shape of the first reinforcing bar 100
becomes a bar material shape that is extended by the width stepped
in a layered form. The shape extended in the layered form includes
any one extended shape selected from an acute-angled shape, a
right-angled shape, an obtuse-angled shape, and a tapered shape and
a structure in which the width is extended is included regardless
of the form.
[0097] For a width of the shape of the second binding end member
130 to also be the same as or similar to that of the shape of the
second reinforcing bar 110 to have a structure in which the second
binding end member 130 and the second reinforcing bar 110 are
joined, one end portion shape of the second binding end member 130
is a bar material shape having a transverse cross-sectional surface
formed in a circular shape and the other end portion shape thereof
is a bar material shape having a slightly larger width, wherein the
width is slightly smaller than the inner surface of the fastening
socket 140 to allow the fastening socket 140 to move along the
outer surface and the step 131 formed in the shape of a protruding
band to which the locking step 142 of the fastening socket 140
being moved is locked is formed to become a bar material shape
having a stepped structure. Consequently, due to the stepped
structure, the bar material shape becomes a shape extended by the
width stepped in a layered form near an end portion toward the
first reinforcing bar 100 to form a width that is the same as or
similar to that of the end portion shape of the first binding end
member 120. The shape being extended in the layered form includes a
structure in which the width is extended regardless of the
form.
[0098] The step 131 in the form of a protruding band may be in the
shape of a protruding band surrounding from a portion near the bar
material shape in which the width of the second binding end member
130 is extended up to an end portion surface of the second binding
end member 130 or in the shape of a protruding band that surrounds
the portion near the bar material shape in which the width of the
second binding end member 130 is extended while having a shortened
width. When the step 131 forms the shape of the protruding band
that surrounds while the width is shortened and becomes narrow, a
shape behind a point at which the step 131 ends in the longitudinal
direction of the second binding end member 130 may be a bar
material shape while the width may be the same as that of the bar
material shape in front of the point at which the step 131 starts
or may be slightly adjusted.
[0099] The inner surface of the fastening socket 140 is a
cylindrical shape having a circumference that is rotatable in the
fastening tightening screw direction while having the longitudinal
direction as an axis to move along the outer surface of the second
binding end member 130 or move in a rotational direction for
helical fastening and has a movable structure that surrounds the
width of the binding end member which is a bar material shape
overall. Also, the locking step 142 protruding in a central
direction in the shape of a protruding band is disposed at an
opposite end portion of the female screw portion 141 for coupling
the fastening socket at the inner surface of the fastening socket
140 to be locked to the step 131 of the second binding end member
130. The step 131 forms the shape of a protruding band at the outer
surface of the second binding end member 130 and the locking step
142 forms the shape of a protruding band at the inner surface of
the fastening socket 140.
[0100] Since the inner surface of the fastening socket 140 has a
circumference that is rotatable in the fastening tightening screw
direction while having the longitudinal direction as an axis and
the female screw portion 141 for coupling the fastening socket is
formed at the inner surface of the fastening socket 140, the bar
material shape in which the width of the second binding end member
130 is extended is surrounded by an inner portion of the fastening
socket 140 and the female screw portion 141 for coupling the
fastening socket is formed at an inner surface of an end portion
further protruding toward the first binding end member 120 such
that a structure allowing the bar material shape in which the width
of the second binding end member 130 is extended and the bar
material shape in which the width of the first binding end member
120 is extended to abut each other is formed while enabling the
fastening socket 140 to be helically fastened to the male screw
portion 121 for coupling the fastening socket of the bar material
shape in which the width of the first binding end member 120 is
extended, and the locking step 142 and the step 131 in the shape of
a protruding band strongly come in contact with and are supported
by each other as the fastening socket 140 is helically fastened,
thereby enabling an end portion of the extended bar material shape
in which the male screw portion 121 for coupling the fastening
socket of the first binding end member 120 is formed and the end
portion of the extended bar material shape of the second binding
end member 130 to be integrally coupled while being supported
facing each other.
[0101] Meanwhile, referring to FIG. 10, since a tensile force
occurring at an end portion is supported by a screw coupling
structure of the fastening socket and the first binding end member
and a configuration in which the locking step of the fastening
socket and the step of the second binding end member come in close
contact and are supported in accordance with a size of reinforcing
bars to be joined, when the locking step 170 and the step 171 are
formed in multiple stages, the tensile force is distributed
throughout the plurality of steps 171 sequentially coming in close
contact with and being supported by each other, thus forming a
stable holding structure.
[0102] To bear a tensile strength of reinforcing bars to which the
step 131 and the locking step 142 are to be fastened,
cross-sectional areas of the step 131 and the locking step 142 are
the same as cross-sectional areas of the reinforcing bars to be
bound or are formed as an area slightly adjusted depending on the
strength of the reinforcing bars in accordance with the
cross-sectional areas of the reinforcing bars to be bound.
[0103] In addition, a shape of an end portion at which the first
binding end member 120 and the second binding end member 130 are
made to abut each other may be formed in a wide variety of
ways.
[0104] First, the end portion shape of the first binding end member
120 may be a protruding portion formed in the longitudinal
direction, and the end portion shape of the second binding end
member 130 may be an accommodation unit formed in the same shape as
the protruding portion to have the protruding portion fitted
thereto. That is, an end portion may protrude from the first
binding end member 120 and the protruding end portion may form a
configuration in which abutting between the first binding end
member 120 and the second binding end member 130 is technically
simple in accordance with a characteristic of a protruding shape.
The abutting between the first binding end member 120 and the
second binding end member 130 provides a technical characteristic
not only in coupling one reinforcing bar with another reinforcing
bar but also in a work of coupling reinforcing bar cages to enable
a series of main reinforcing bars forming a reinforcing bar cage to
be smoothly coupled to main reinforcing bars of a reinforcing bar
cage disposed at a lower portion. When the end portion shape of the
second binding end member 130 is formed in the same shape as the
first binding end member 120 toward the second reinforcing bar 110
to form the accommodation unit by being concavely formed instead of
protruding by being convexly formed, the accommodation unit to
which the protruding portion is perfectly fitted may be formed.
[0105] Meanwhile, referring to FIG. 11, the protruding portion need
not necessarily be disposed at the first binding end member 120,
but a protruding portion 132 may be disposed at the second binding
end member 130, and conversely, an accommodation unit 122 of the
protruding portion may be disposed at the first binding end member
120. That is, a direction of the protrusion and a direction of the
accommodation may be selectively formed by being changed with each
other in accordance with a position and a condition of joining
reinforcing bars.
[0106] Referring to FIGS. 12 to 14, the end portion shape of the
first binding end member 120 may be, for example, any one selected
from a cone 810, a truncated cone 820, a rounded cone 830, a
cylinder, a polygonal pyramid, a truncated polygonal pyramid 840, a
rounded polygonal pyramid, a polygonal column, a cut spherical
shape, and a cut elliptical-spherical shape 850 protruding from the
center in the longitudinal direction, and a flat surface 860 and an
embossed surface perpendicular to the longitudinal direction.
[0107] First, a shape of the cone 810 protruding from the center in
the longitudinal direction may have a longitudinal cross-section of
the end portion shape formed in a shape in which a vertex of the
cone 810 is formed toward the second reinforcing bar 110 while a
circumference of a lower portion of the cone 810 may be formed to
have various area proportions with respect to a cross-sectional
area of the first reinforcing bar 100. A transverse cross-sectional
area is increased to reach the circumference of the lower portion
of the shape of the cone 810 when the circumference of the lower
portion is formed corresponding to the cross-sectional area of the
first reinforcing bar 100, and the transverse cross-sectional area
is decreased to reach the circumference of the lower portion of the
shape of the cone 810 when the circumference of the lower portion
is formed smaller than the cross-sectional area of the first
reinforcing bar 100.
[0108] Referring to FIG. 19, with respect to the end portions of
the first binding end member 120 formed in the shape of the cone
810, when end portions of reinforcing bar cages of a prefabricated
reinforcing bar network to be joined are not uniform in assembly of
reinforcing bar cages, vertices of shapes of the cone 810 that are
end portion shapes of the first binding end member 120 bound to end
portions of a plurality of main reinforcing bars that have come in
contact at once come in contact with predetermined points of the
accommodation units formed in the same shape as the cone 810 of the
second binding end member 130 bound to end portions of the
plurality of main reinforcing bars at a lower portion to be
naturally guided for the upper and lower reinforcing bar cages to
abut each other and be tightly fitted.
[0109] That is, when the upper reinforcing bar cage is lifted by
lifting equipment to align central axes of end portions of the
reinforcing bar cage to be connected to the lower reinforcing bar
cage and the upper reinforcing bar cage is gradually lowered while
adjusting to align a central line of each of the reinforcing bars,
the central axes are naturally aligned as the protruding portion in
the shape of the cone 810 of the first binding end member 120 bound
to end portions of reinforcing bars of the upper reinforcing bar
network is guided by the accommodation unit in the shape of the
cone 810 of the second binding end member 130 such that the upper
and lower reinforcing cages are made to abut each other, and the
upper and lower reinforcing cages are fastened by lifting and
fastening the fastening socket 140 pre-coupled to the reinforcing
bars of each of the reinforcing bar networks toward the first
reinforcing bar 100 while the upper and lower reinforcing cages are
abutting each other.
[0110] Furthermore, the shape of the cone 810 may be a shape of the
truncated cone 820 that is flatly cut in the transverse direction
at a predetermined point. Or, a vertex of the cone may be roundly
processed to form a shape of the rounded cone 830 that has a round
shape at a vertex. Also, a circumference may be formed at a desired
distance away from the center within a range of an outer diameter
of the first binding end member 120 to be a cylindrical boss that
enables the abutting. Furthermore, when an end portion surface of
the cylindrical shape is a flat surface, shapes of a cone, a
truncated cone, a rounded cone, a cylinder, a polygonal pyramid, a
truncated polygonal pyramid, a rounded polygonal pyramid, a
polygonal column, a cut spherical shape, a cut elliptical-spherical
shape, and an embossed surface may be disposed again on the flat
end portion. Thus, the modified embodiment is also included in the
scope of the present invention.
[0111] In addition, the end portion shape of the first binding end
member 120 protruding from the center in the longitudinal direction
may be in the shape of a polygonal pyramid that is formed from a
polygon having a lower portion toward the first reinforcing bar 100
forming a polygon and a cross-sectional area gradually being
narrowed toward an upper portion, or in the shape of a truncated
polygonal pyramid 840 that is a shape in which the polygonal
pyramid is flatly cut in the transverse direction at a
predetermined point. Alternatively, a vertex of the polygonal
pyramid may be roundly processed to form a shape of a rounded
polygonal pyramid that has a round shape formed at a vertex. Also,
an edge forming a polygon may be formed at a desired distance from
the center within the range of the outer diameter of the first
binding end member 120 to be in the shape of a polygonal column
that enables the abutting. Furthermore, when an end portion surface
of the polygonal column shape is a flat surface, shapes of a cone,
a truncated cone, a rounded cone, a cylinder, a polygonal pyramid,
a truncated polygonal pyramid, a rounded polygonal pyramid, a
polygonal column, a cut spherical shape, a cut elliptical-spherical
shape, and an embossed surface may be disposed again on the flat
end portion. Thus, the modified embodiment is also included in the
scope of the present invention.
[0112] In addition, the end portion shape may be formed in a cut
spherical shape that has a curved surface to facilitate the
abutting or formed in a cut elliptical-spherical shape 850 that has
an inner diameter of one side extended to form an ellipse to have
different surface curvatures at different points.
[0113] That is, the cut spherical shape and the cut
elliptical-spherical shape 850 include a case in which a shape in
which a perfectly spherical shape or a rotational ellipsoid is cut
at a predetermined point forms the end portion shape of the first
binding end member 120. The cut spherical shape and the cut
elliptical-spherical shape 850 are shapes cut by surfaces parallel
or non-parallel to the end portion surface of the binding end
member, and include both shapes with a definite side or peak and
roundish shapes with no definite side or peak.
[0114] In addition, the end portion shape of the first binding end
member 120 may form the flat surface 860 that is perpendicular to
the longitudinal direction and an abutting end surface may form the
flat surface 860, or embossed surfaces may be formed. Also with
respect to this shape, when the end portion shape of the second
binding end member 130 is formed in the same shape as the first
binding end member 120 to form the accommodation unit to be concave
instead of convex toward the second reinforcing bar 110, the
accommodation unit to which the protruding portion is perfectly
fitted may be formed.
[0115] The end portion shape need not necessarily be disposed at
the first binding end member 120, but the shape of the protruding
portion 132 may be disposed at the second binding end member 130,
and conversely, the accommodation unit 122 of the shape may be
disposed at the first binding end member 120. That is, a direction
of the convex formation and a direction of the concave formation in
which the accommodation unit is formed may be selectively formed by
being changed with each other in accordance with a position and a
condition of joining reinforcing bars.
[0116] Meanwhile, referring to FIG. 13, the end portion shape of
the first binding end member 120 or the second binding end member
130 may form, for example, a multi-step inclined type protruding
portion 835 protruding from the center in the longitudinal
direction.
[0117] That is, the multi-step inclined type protruding portion 835
is an inclined type protruding portion having multiple steps formed
at an end in the longitudinal direction, and is formed of sections
D1 in which a surface area of a cross-sectional surface
perpendicular to a central axis line narrows in the longitudinal
direction and a section D2 in which the surface area is
constant.
[0118] When performing a work of connecting and joining vertical
reinforcing bars, the multi-step inclined type protruding portion
835 is guided and inserted into the accommodation unit from a
contact surface of the binding end member interfering from the
sections D1 in which the surface area narrows.
[0119] Accordingly, a shaft center of each of the main reinforcing
bars may be aligned by the multi-step inclined type protruding
portion 835 when clusters of prefabricated reinforcing bar networks
are coupled, thereby facilitating a configuration of a connecting
and joining portion when performing on-site construction of a
reinforcing bar network to which a prefabrication method is
applied.
[0120] In addition, the multi-step inclined type protruding portion
835 is inserted into the accommodation unit from the section D2 in
which the surface area is constant for joining and connecting in a
work of connecting and joining horizontal reinforcing bars, thereby
removing a risk of a reinforcing bar to be joined sliding out of
the accommodation unit and being lowered from a support point P
generated by a section in which a cross-sectional area is constant
and a risk of the reinforcing bar to be joined deviating from the
central axis line, and thus efficiency of the work of connecting
and joining the horizontal reinforcing bars for a beam structure,
etc. may be improved.
[0121] The accommodation unit of the multi-step inclined type
protruding portion 835 is formed in a shape corresponding to the
multi-step inclined type protruding portion 835. When the
accommodation unit has an inner surface formed in the same shape as
the multi-step inclined type protruding portion 835, the
accommodation unit may be a fitting recessed groove, and the
multi-step inclined type protruding portion 835 may be fitted and
matched with the accommodation unit.
[0122] The multi-step inclined type protruding portion 835 and the
accommodation unit of the first binding end member 120 and the
second binding end member 130 may be changed with each other.
[0123] Referring to FIGS. 15 and 16, the embossed surface forming
the end portion shape of the first binding end member 120 may be
formed of a convex portion having one or a plurality of any one
selected from a triangular shape 910, a quadrangular shape 920, a
triangular shape with rounded vertices, a quadrangular shape 930
with rounded corners, a cut spherical shape, a cut
elliptical-spherical shape, a cross shape 940 formed at an end
portion surface, a shape in which a cross shape and a circular
shape are combined, and a corrugated shape 950 which protrude from
the end portion surface, and a concave portion formed in a shape
accommodating the convex portion.
[0124] First, the embossed portion may be formed of a convex
portion having one or a plurality of cross-sectional shapes
equidistant from the center of the end portion surface in the
longitudinal direction formed in the triangular shape 910 and a
concave portion accommodating the convex portion formed at the
second binding end member 130.
[0125] That is, the embossed surface in the triangular shape 910 is
a shape in which a plurality of protruding portions formed in the
triangular shape 910 are formed when a longitudinal cross-section
of the first binding end member 120 is viewed, is a circular convex
portion having an edge formed toward an upper end when an end
portion surface is viewed, is a shape in which the same shape is
recessed when a longitudinal cross-section of the second binding
end member 130 is viewed, and is a concave portion accommodating
the circular convex portion when an end portion surface is viewed.
Also, when vertices are rounded, an embossed surface in the
triangular shape forming a round shape is formed.
[0126] The embossed surface may be an embossed surface formed not
only in the triangular shape 910 but in the quadrangular shape 920.
That is, the embossed surface in the quadrangular shape 920 is a
shape in which a plurality of protruding portions formed in the
quadrangular shape 920 are formed when a longitudinal cross-section
of the first binding end member 120 is viewed, is a circular convex
portion having two edges formed toward an upper end when an end
portion surface is viewed, is a shape in which the same shape is
recessed when a longitudinal cross-section of the second binding
end member 130 is viewed, and is a concave portion accommodating
the circular convex portion when an end portion surface is viewed.
Also, when vertices are rounded, an embossed surface in the
quadrangular shape 930 forming a round shape is formed.
[0127] Furthermore, when the end portion surface of the first
binding end member 120 is viewed, the end portion shape may form an
embossed surface formed of a shape in which a plurality of cut
spheres or cut ellipses protrude.
[0128] In addition, when the end portion surface of the first
binding end member 120 is viewed, a protruding portion in the cross
shape 940 may be formed. The protruding portion having intersecting
straight lines to form the cross may form a more densely
intersecting shape by having a plurality of straight lines radially
arranged with respect to the center or the cross shape 940 may be
combined with the circular protruding portion.
[0129] Furthermore, a protruding portion in the corrugated shape
950 curved in a wave form may be formed at the end portion surface
of the first binding end member 120, and an accommodation unit of
the corrugated shape 950 may be formed at the end portion surface
of the second binding end member 130 to be embossedly coupled.
[0130] Also with respect to the embossed surface, the convex
portion and the concave portion may be changed with each other by
the convex portion being formed at the second binding end member
130 instead of being formed at the first binding end member 120 and
the accommodation unit being formed at the first binding end member
120.
[0131] Since fitting in a process in which end portion shapes are
made to abut each other is difficult when the protruding shape of
the embossed surface is too small with respect to a diameter of the
first binding end member 120, and interference or deformation may
occur when the first binding end member 120 and the second binding
end member 130 are joined if the protruding shape of the embossed
surface is too large, the protruding shape is preferably formed
selectively in the most preferable shape.
[0132] The end portion shapes of the first binding end member 120
and the second binding end member 130 are not limited to any one of
the above embodiments, and shapes in which the shapes enabling
close interlocking are arbitrarily combined may also be easily
derived.
[0133] The first binding end member 120, the second binding end
member 130, and the fastening socket are individual elements, and
particularly, each of the first binding end member 120 and the
second binding end member, are independent members formed of single
pieces. In the first embodiment of the present invention, joining
of reinforcing bars is possible because the three parts that are
each one piece form one group.
[0134] Next, FIG. 3 is a cross-sectional view illustrating
connection of reinforcing bars according to a second embodiment of
the present invention in detail.
[0135] The second embodiment according to the present invention
includes a first reinforcing bar 200, a second reinforcing bar 210,
a first binding end member 220, a second binding end member 230, a
fastening socket 240, a middle binding member 250, and a lock nut
body 260.
[0136] In the first embodiment, there are no adjustable spaces in
either end portion when reinforcing bars that are prearranged and
cannot be moved are joined, and thus fastening of the first binding
end member 220 and the second binding end member 230 becomes
difficult when end portions of the first binding end member 220 and
the second binding end member 230 cannot be made to abut each
other. Consequently, in the second embodiment, the middle binding
member 250 is interposed between the first binding end member 220
and the reinforcing bar or between the second binding end member
230 and the reinforcing bar or the middle binding member 250 is
interposed between the first binding end member 220 and the second
binding end member 230 to adjust a joining length of the first
reinforcing bar 200 and the second reinforcing bar 210 when
needed.
[0137] First, for example, to describe a case in which the middle
binding member 250 is interposed between the first reinforcing bar
200 and the first binding end member 220, the middle binding member
250 is a longitudinal member in which one end portion is bound to
an end portion of the first reinforcing bar 200 and a male screw
portion 251 for coupling the middle binding member 250 is formed in
a predetermined section from the one end portion to the other end
portion, an accommodation groove 221 that accommodates the middle
binding member 250 is formed in the first binding end member 220,
and a female screw portion 222 for coupling the middle binding
member 250 is formed at an inner surface of the accommodation
groove 221 such that a position at which the middle binding member
250 is coupled after being inserted may be precisely and slightly
adjusted by the first binding member. That is, when reinforcing
bars to be joined are prearranged and end portion shapes of the
first binding end member 220 and the second binding end member 230
cannot abut each other because intervals between reinforcing bars
in coupling reinforcing bar cages are too large or non-uniform, or
when a construction error of arranged reinforcing bars occurs,
adjusting a position of the first binding end member 220 inserted
into the middle binding member 250 by rotating the first binding
end member 220 by a screw to be moved back and forth to abut the
end portion of the second binding end member 230 to be tightly
fitted thereto becomes possible. When coupling by the fastening
socket 240 is completed after the position adjustment is completed,
the lock nut body 260 is fastened to fix the position of the first
binding end member 220. Consequently, the lock nut body 260 is
preferably pre-inserted into the middle binding member 250 for
fixing the position by fastening and the first binding end member
220 is inserted thereinto.
[0138] In addition, referring to FIG. 20, for example, when an
upper reinforcing bar cage which is a prefabricated reinforcing bar
network is fastened to a lower reinforcing bar cage, the upper
reinforcing bar cage formed of main reinforcing bars having the
first binding end member 220 bound to end portions is lowered by
lifting equipment corresponding to the lower reinforcing bar cage
and end portions, and first, reinforcing bars having both end
portions abutting to be fitted are fastened by lifting the
fastening socket 240, the middle binding member 250 is moved back
and forth in reinforcing bars in which an interval is generated
between end portions of the first binding end member 220 and the
second binding end member 230 to adjust the end portion shapes of
the first binding end member 220 and the second binding end member
230 to abut each other, and remaining reinforcing bars are
integrally fastened by lifting the fastening socket 240 and locked
by the lock nut body 260, thereby completing the fastening between
the upper and lower reinforcing bar cages.
[0139] The lock nut body 260 may have a transverse cross-sectional
surface formed in a circular or polygonal shape to form a hexagon
like a commonly used nut or a polygon with more than six angles.
The end portion of the first binding end member 220 corresponding
to the middle binding member 250 may be formed as in one case
selected from a case in which a cross-sectional shape from the end
portion surface up to a predetermined distance is a circular shape
or a polygonal shape, and a case in which grip surfaces which are
one pair or multiple pairs of flat surfaces are formed.
Accordingly, fastening of the lock nut may be facilitated since the
first binding end member 220 may be gripped more firmly when the
lock nut is fastened, and an initial slip of reinforcing bars when
they are tensioned may be prevented by the lock nut body 260 being
fastened to come in close contact with the first binding end member
220. Preferably, the transverse cross-sectional surface may form a
polygon with more than six angles to facilitate tool gripping and
increase the transverse cross-sectional area above that of a
hexagon.
[0140] The middle binding member 250 may be interposed between the
second binding end member 230 and the second reinforcing bar 210 or
disposed at both sides of the first binding end member 220 and the
second binding end member 230 to adjust the joining length
corresponding to an interval between reinforcing bars. That is,
when the middle binding member 250 is disposed at both of the
sides, the joining length may be adjusted within a more extended
range. The fastening socket 240 has the same configuration as in
the first embodiment.
[0141] Next, FIG. 4 is a cross-sectional view illustrating
connection of reinforcing bars according to a third embodiment of
the present invention in detail.
[0142] The third embodiment according to the present invention
includes a first threaded joint type reinforcing bar 310, a second
threaded joint type reinforcing bar 320, a first binding end member
330, a second binding end member 350, and a fastening socket
340.
[0143] Although there may be various embodiments for binding the
first binding end member 330 to a reinforcing bar, a female screw
portion 332 for accommodating a screw shape of the threaded joint
type reinforcing bar may be disposed at the first binding end
member 330 when a reinforcing bar to be bound is a threaded joint
type reinforcing bar to enable binding between the threaded joint
type reinforcing bar and the first binding end member 330.
[0144] Thus, joining of a threaded joint type reinforcing bar
becomes possible by only forming an accommodation groove 331 at the
first binding end member 330 and the female screw portion 332
helically coupled to the first threaded joint type reinforcing bar
310 and the second threaded joint type reinforcing bar 320 at an
inner surface of the accommodation groove 331.
[0145] According to a configuration of a reinforcing bar connector
using a screw type sleeve with respect to a conventional,
well-known threaded joint type reinforcing bar, a configuration in
which a threaded joint of a threaded joint type reinforcing bar is
coupled to an inner surface of a sleeve for a first threaded joint
type reinforcing bar and a second threaded joint type reinforcing
bar to be fastened is disclosed. An end portion shape of the sleeve
is a shape in which one end portion in the axial direction of one
sleeve is formed of a tapered protrusion portion protruding in a
tapered form, and one end portion in the axial direction of another
sleeve is formed of a tapered recessed groove portion formed of a
recessed groove in the form of a funnel into which the tapered
protrusion portion is tightly fitted. Thus, in the present
invention, instead of the shape of the tapered protrusion portion,
an end portion shape of the first binding end member 330 is formed
of a configuration forming any one selected from a cylinder, a
polygonal pyramid, a truncated polygonal pyramid, a rounded
polygonal pyramid, a polygonal column, a cut spherical shape 331, a
cut elliptical-spherical shape protruding from a center in the
longitudinal direction, and a flat surface 360 and an embossed
surface perpendicular to the longitudinal direction.
[0146] The end portion is formed of a cylinder, a polygonal
pyramid, a truncated polygonal pyramid, a rounded polygonal
pyramid, a polygonal column, the cut spherical shape 331, a cut
elliptical-spherical shape, or a flat surface and an embossed
surface perpendicular to the longitudinal direction, and the
fastening socket 340 has the same configuration as in the first
embodiment.
[0147] Next, FIG. 5 is a cross-sectional view illustrating
connection of reinforcing bars according to a fourth embodiment of
the present invention in detail.
[0148] The fourth embodiment according to the present invention
includes a first reinforcing bar 410, a second reinforcing bar 420,
a first binding end member 430, a second binding end member 440,
and a fastening socket 450.
[0149] In this embodiment, the first reinforcing bar 410 and the
second reinforcing bar 420 are reinforcing bars in which male screw
portions 411 and 421 are respectively formed at end portions to be
coupled by a screw method, an accommodation groove 431 for
accommodating the end portion of the reinforcing bar at which the
male screw portion 411 is formed is formed at the end portion of
the first binding end member 430, and a female screw portion 432
helically coupled to the male screw portion 411 formed at the end
portion of the first reinforcing bar 410 is formed at the
accommodation groove 431. Thus, joining of the reinforcing bar in
which the male screw portion 411 is formed at the end portion
becomes possible by only forming the accommodation groove 431 at
the first binding end member 430 and the female screw portion 432
at an inner surface of the accommodation groove 431.
[0150] According to a configuration of a reinforcing bar connector
using a screw type sleeve with respect to a conventional,
well-known reinforcing bar in which a screw thread is processed at
an end portion, a configuration in which a first reinforcing bar
and a second reinforcing bar are reinforcing bars at which male
screw portions are formed at end portions and the male screw
portions formed at the end portions of the reinforcing bars are
coupled to inner surfaces of a sleeve to be helically fastened is
disclosed. An end portion shape of the sleeve is a shape in which
one end portion in the axial direction of one sleeve is formed of a
tapered protrusion portion protruding in a tapered form, and one
end portion in the axial direction of another sleeve is formed of a
tapered recessed groove portion formed of a recessed groove in the
form of a funnel into which the tapered protrusion portion is
tightly fitted. Thus, in the present invention, instead of the
shape of the tapered protrusion portion, an end portion shape of
the first binding end member 430 is formed of a configuration
forming any one selected from a cylinder, a polygonal pyramid, a
truncated polygonal pyramid, a rounded polygonal pyramid, a
polygonal column, a cut spherical shape 433, a cut
elliptical-spherical shape protruding from a center in the
longitudinal direction, and a flat surface 460 and an embossed
surface perpendicular to the longitudinal direction.
[0151] The end portion is formed of a cylinder, a polygonal
pyramid, a truncated polygonal pyramid, a rounded polygonal
pyramid, a polygonal column, a cut spherical shape, a cut
elliptical-spherical shape, or a flat surface and an embossed
surface perpendicular to the longitudinal direction, and the
fastening socket 450 has the same configuration as in the first
embodiment.
[0152] Next, FIG. 6 is a cross-sectional view illustrating
connection of reinforcing bars according to a fifth embodiment of
the present invention in detail.
[0153] The fifth embodiment according to the present invention
includes a first threaded joint type reinforcing bar 510, a second
threaded joint type reinforcing bar 520, a first binding end member
530, a second binding end member 540, and a fastening socket 550,
and detailed configurations of the first binding end member 530 and
the second binding end member 540 are different from the second
embodiment.
[0154] That is, the first threaded joint type reinforcing bar 510
has a configuration in which a female screw portion for coupling a
threaded joint type reinforcing bar helically coupled to an end
portion of the first threaded joint type reinforcing bar 510 is
formed by penetrating an inner surface in the longitudinal
direction for the first threaded joint type reinforcing bar to
penetrate the first binding end member 530 to protrude toward the
second threaded joint type reinforcing bar 520, and a male screw
portion for coupling the fastening socket 550 is formed in the
longitudinal direction at an outer surface.
[0155] In addition, with respect to the second threaded joint type
reinforcing bar 520 facing the first threaded joint type
reinforcing bar 510, a female screw portion for coupling a threaded
joint type reinforcing bar helically coupled to an end portion of
the second threaded joint type reinforcing bar 520 is formed by
penetrating an inner surface in the longitudinal direction for the
second threaded joint type reinforcing bar 520 to penetrate the
second binding end member 540 to protrude toward the first threaded
joint type reinforcing bar 510, and one end portion in the axial
direction is perpendicular to the longitudinal direction at an
outer surface to have one or a plurality of steps with which a
locking step of the fastening socket comes in close contact to be
supported.
[0156] In addition, as in the first embodiment, the fastening
socket 550 formed in a hollow shape opened in the longitudinal
direction to extend in the longitudinal direction in order to
surround and accommodate an outer surface of the second binding end
member 540 and an outer surface of the first binding end member
530, having a female screw portion 541 for coupling the fastening
socket 550 helically coupled to the male screw portion for coupling
the fastening socket 550 formed in the longitudinal direction at an
inner surface, and having one or a plurality of locking steps
locked to a step of the second binding end member 540 is formed,
and fastening becomes possible by the fastening socket 550 moving
from the second binding end member 540 toward the first binding end
member 530.
[0157] In the fastening process, first, the first binding end
member 530 is penetrated by insertion of the first threaded joint
type reinforcing bar 510, and the second binding end member 540 is
penetrated by insertion of in the second threaded joint type
reinforcing bar 520 while the fastening socket 550 is penetrated by
insertion of the second threaded joint type reinforcing bar 520 in
advance in a direction in which the fastening socket extends toward
the first reinforcing bar. Thus, protruding end portions of the
first threaded joint type reinforcing bar 510 and the second
threaded joint type reinforcing bar 520 may tightly support each
other.
[0158] Then, the fastening socket 550 that is penetrated by
insertion is moved toward the first threaded joint type reinforcing
bar 510 and rotated in the fastening direction to allow the locking
step of the fastening socket 550 to be tightly supported by the
step of the second binding end member 540, and is rotated in the
fastening direction such that an end portion surface of the first
threaded joint type reinforcing bar 510 and an end portion surface
of the second threaded joint type reinforcing bar 520 abut and
tightly support each other.
[0159] The first binding end member 530 and the second binding end
member 540 are integrally fastened by the fastening socket 550 to
complete mechanical joining of the first threaded joint type
reinforcing bar 510 and the second threaded joint type reinforcing
bar 520.
[0160] Accordingly, when the fastening is completed, the end
portions of the first threaded joint type reinforcing bar 510 and
the second threaded joint type reinforcing bar 520 tightly support
each other, thereby enabling joining of reinforcing bars that
tightly support each other stably.
[0161] The end portion surfaces of the first threaded joint type
reinforcing bar 510 and the second threaded joint type reinforcing
bar 520 that tightly support each other may be formed in various
shapes. The end portion shapes of the first threaded joint type
reinforcing bar 510 and the second threaded joint type reinforcing
bar 520 have the same configuration as the examples of the end
portion shapes of the first binding end member 530 and the second
binding end member 540 of the first embodiment.
[0162] That is, the end portion shape of the first threaded joint
type reinforcing bar 510 may be any one selected from a cone 511, a
truncated cone, a rounded cone, a cylinder, a polygonal pyramid, a
truncated polygonal pyramid, a rounded polygonal pyramid, a
polygonal column, a cut spherical shape, and a cut
elliptical-spherical shape protruding from the center in the
longitudinal direction, and a flat surface 560 and an embossed
surface perpendicular to the longitudinal direction, and in a
selected example, a possible processed shape of the end portions of
the first threaded joint type reinforcing bar 510 and the second
threaded joint type reinforcing bar 520 is a shape that may be cut
in a processing method using rotational motion, and may be the
shape of a cone, a truncated cone, a cut sphere, and a cut
elliptical sphere.
[0163] Any one of a case in which the end portion shape of the
second threaded joint type reinforcing bar 520 is an accommodation
unit of the end portion shape of the first threaded joint type
reinforcing bar 510 formed in the same shape as the end portion
shape of the first threaded joint type reinforcing bar 510 and a
case in which the end portion shape of the first threaded joint
type reinforcing bar 510 and the end portion shape of the second
threaded joint type reinforcing bar 520 are changed with each other
may be realized.
[0164] Preferably, the end portion of the first threaded joint type
reinforcing bar 510 is formed in the shape of a cone or a truncated
cone, and the end portion of the second threaded joint type
reinforcing bar 520 forms an accommodation unit of that shape to
allow the shape to be tightly fitted thereto. That is, since an end
portion area of the first threaded joint type reinforcing bar 510
becomes a space that is narrower than an end portion area of the
first binding end member 530, due to the narrowness of the space, a
shape that may be easily processed and may easily abut the
accommodation unit is preferably selected as the shape of the end
portion. The embossed surface has the same configuration as in the
first embodiment. The fastening socket 550 has the same
configuration as in the first embodiment.
[0165] Next, FIG. 7 is a cross-sectional view illustrating
connection of reinforcing bars according to a sixth embodiment of
the present invention in detail.
[0166] Next, the sixth embodiment according to the present
invention includes a first reinforcing bar 610, a second
reinforcing bar 620, a first binding end member 630, a second
binding end member 640, and a fastening socket 650, and the first
reinforcing bar 610 and the second reinforcing bar 620 are
reinforcing bars in which male screw portions are formed at end
portions, unlike the fifth embodiment.
[0167] That is, the first reinforcing bar 610 has a configuration
in which a female screw portion for coupling a reinforcing bar
having a male screw portion formed at an end portion helically
coupled to an end portion of the first reinforcing bar 610 is
formed by penetrating an inner surface in the longitudinal
direction for the first reinforcing bar to penetrate the first
binding end member 630 to protrude toward the second reinforcing
bar 620, and a male screw portion for coupling the fastening socket
650 is formed in the longitudinal direction at an outer
surface.
[0168] In addition, with respect to the second reinforcing bar 620
facing the first reinforcing bar 610, a female screw portion for
coupling a reinforcing bar having a male screw portion formed at an
end portion helically coupled to an end portion of the second
reinforcing bar 620 is formed by penetrating an inner surface in
the longitudinal direction for the second reinforcing bar 620 to
penetrate the second binding end member 640 to protrude toward the
first reinforcing bar 610, and one end portion in the axial
direction is perpendicular to the longitudinal direction at an
outer surface to have one or a plurality of steps with which a
locking step of the fastening socket is tightly supported.
[0169] In addition, as in the first embodiment, the fastening
socket 650 formed in a hollow shape opened in the longitudinal
direction to extend in the longitudinal direction in order to
surround and accommodate an outer surface of the second binding end
member 640 and an outer surface of the first binding end member
630, having a female screw portion 641 for coupling the fastening
socket 650 helically coupled to the male screw portion for coupling
the fastening socket 650 of the first binding end member 630 formed
in the longitudinal direction at an inner surface, and having one
or a plurality of locking steps locked to a step of the second
binding end member 640 is formed, and fastening becomes possible by
the fastening socket 650 moving from the second binding end member
640 toward the first binding end member 630.
[0170] In the fastening process, first, the first binding end
member 630 is penetrated by insertion of the first reinforcing bar
610, the second binding end member 640 is penetrated by insertion
of the second reinforcing bar 620, while the fastening socket 650
is penetrated by insertion of the second reinforcing bar 620 in
advance in a direction in which the fastening socket extends toward
the first reinforcing bar. Thus, protruding end portions of the
first reinforcing bar 610 and the second reinforcing bar 620 may
abut and tightly support each other.
[0171] Then, the fastening socket 650 that is penetrated by
insertion is moved toward the first reinforcing bar 610 and rotated
in the fastening direction to allow the locking step of the
fastening socket 650 to be tightly supported by the step of the
second binding end member 640, and is rotated in the fastening
direction such that an end portion surface of the first reinforcing
bar 610 and an end portion surface of the second reinforcing bar
620 are tightly supported by each other.
[0172] The first binding end member 630 and the second binding end
member 640 are integrally fastened by the fastening socket 650 to
complete mechanical joining of the first reinforcing bar 610 and
the second reinforcing bar 620.
[0173] Accordingly, when the fastening is completed, the end
portions of the first reinforcing bar 610 and the second
reinforcing bar 620 tightly support each other, thereby enabling
joining of reinforcing bars that tightly support each other
stably.
[0174] The end portion surfaces of the first reinforcing bar 610
and the second reinforcing bar 620 that tightly support each other
may be formed in various shapes. The end portion shapes of the
first reinforcing bar 610 and the second reinforcing bar 620 have
the same configuration as the examples of the end portion shapes of
the first binding end member 630 and the second binding end member
640 of the first embodiment.
[0175] That is, the end portion shape of the first reinforcing bar
610 may be any one selected from a cone 511, a truncated cone, a
rounded cone, a cylinder, a polygonal pyramid, a truncated
polygonal pyramid, a rounded polygonal pyramid, a polygonal column,
a cut spherical shape, and a cut elliptical-spherical shape
protruding from the center in the longitudinal direction, and a
flat surface 560 and an embossed surface perpendicular to the
longitudinal direction, and in a selected example, a possible
processed shape of the end portions of the first reinforcing bar
610 and the second reinforcing bar 620 is a shape that may be cut
in a processing method using rotational motion, and may be the
shape of a cone, a truncated cone, a cut sphere, and a cut
elliptical sphere.
[0176] Any one of a case in which the end portion shape of the
second reinforcing bar 620 is an accommodation unit of the end
portion shape of the first reinforcing bar 610 formed in the same
shape as the end portion shape of the first reinforcing bar 610 and
a case in which the end portion shape of the first reinforcing bar
610 and the end portion shape of the second reinforcing bar 620 are
changed with each other may be realized.
[0177] Preferably, the end portion of the first reinforcing bar 610
is formed in the shape of a cone or a truncated cone, and the end
portion of the second reinforcing bar 620 forms an accommodation
unit of that shape to allow the shape to be tightly fitted thereto.
That is, since an end portion area of the first reinforcing bar 610
becomes a space that is narrower than an end portion area of the
first binding end member 630, due to the narrowness of the space, a
shape that may be easily processed and may easily abut the
accommodation unit is preferably selected as the shape of the end
portion. The embossed surface has the same configuration as in the
first embodiment. The fastening socket 650 has the same
configuration as in the first embodiment.
[0178] The fifth embodiment and the sixth embodiment are preferable
configurations when joining of reinforcing bars is performed
individually, do not require a lock nut body since a portion to be
joined by the lock nut body does not have to be fastened, and an
initial slip from a state in which reinforcing bars are joined is
completely eliminated because the end portions of the first
reinforcing bar 610 and the second reinforcing bar 620 abut and
tightly support each other using only the fastening socket 650.
That is, since the end portions that abut and tightly support each
other are integrally connected by the fastening socket while
tightly supporting each other, there is no movement of the
reinforcing bars and an initial slip is completely eliminated.
[0179] Next, FIG. 8 is a cross-sectional view illustrating
connection of reinforcing bars according to a seventh embodiment of
the present invention in detail.
[0180] The seventh embodiment according to the present invention
includes a first reinforcing bar 710, a second reinforcing bar 720,
a first binding end member 730, a second binding end member 740, a
middle binding member 760, a fastening socket 750, and a connection
socket 770, and detailed configurations of the first binding end
member 730 and the second binding end member 740 are different from
the second embodiment.
[0181] The middle binding member 760 may be interposed at any one
of a portion between the first reinforcing bar 710 and the first
binding end member 730 and a portion between the second reinforcing
bar 720 and the second binding end member 740, or may be interposed
at both sides.
[0182] First, for example, to describe a configuration in which the
middle binding member 760 is interposed between the second
reinforcing bar 720 and the second binding end member 740, the
middle binding member 760 is bound to the end portion of the second
reinforcing bar 720, a male screw portion 761 for coupling the
middle binding member 760 for helically coupling the middle binding
member 760 and the connection socket 770 is formed in a
predetermined section from one end portion to the other end portion
of the middle binding member 760, a connection unit 741 is formed
at the other end portion of the second binding end member 740
corresponding to the middle binding member 760 within a
predetermined section from the other end portion in order to
helically couple the connection socket 770, a male screw portion
742 for coupling the connection socket 770 for helical coupling to
the connection socket 770 is formed in a section of the connection
unit 741, the connection socket 770, which is a longitudinal member
and a hollow body having one side and the other side opened, that
connects the connection unit 741 to the middle binding member 760
is disposed to connect the second binding end member 740 and the
middle binding member 760 at which the male screw portions 761 and
742 are respectively formed, and a female screw portion 771
helically coupled to the male screw portion 742 for coupling the
connection socket 770 and the male screw portion 761 for coupling
the middle binding member 760 is formed at an inner surface of the
connection socket 770, thereby enabling coupling to the middle
binding member 760 by rotating the connection socket 770 in the
fastening direction.
[0183] Although the seventh embodiment is a configuration in which
the middle binding member 760 is interposed as in the second
embodiment, the second embodiment is a configuration in which an
accommodation groove and a female screw portion are formed at the
first binding end member 730 and the second binding end member 740
to accommodate the middle binding member 760, while in the seventh
embodiment, a configuration in which the connection unit 741 and a
male screw portion are formed at the first binding end member 730
and the second binding end member 740 is formed, unlike the second
embodiment.
[0184] According to this embodiment, a configuration in which the
connection unit 741 and a male screw portion for coupling the
connection socket 770 formed at the connection unit 741 are formed
at the first binding end member 730 and the second binding end
member 740 is formed such that the end portion shapes of the first
binding end member 730 and the second binding end member 740 may be
adjusted to abut each other within a more distant range than when
the joining length is adjusted as in the second embodiment, and a
length of a reinforcing bar may be adjusted in a more extended
range and a construction error may be absorbed by the connection
unit 741.
[0185] The end portion shapes of the first binding end member 730
and the second binding end member 740 that tightly support each
other may have various shapes and have the same configuration as
the examples of the end portion shapes of the first binding end
member 730 and the second binding end member 740 of the first
embodiment.
[0186] According to the first to seventh embodiments of the present
invention, although there may be various examples of binding of the
first reinforcing bars 100, 200, and 710 and the first binding end
members 120, 220, and 730, binding of the second reinforcing bars
110, 210, and 720 and the second binding end members 130, 230, and
740, binding of the first reinforcing bars 200 and 710 and the
middle binding members 250 and 760, and binding of the second
reinforcing bars 210 and 720 and the middle binding members 250 and
760, examples using welding will be described.
[0187] For example, a configuration of binding by any one selected
from friction welding, linear friction welding, arc stud welding,
butt welding, ultrasonic vibration welding, resistance welding,
plasma welding, electronic beam welding, laser welding,
high-frequency welding, and argon welding may be considered.
[0188] Hereinafter, to describe the binding of the first
reinforcing bar and the first binding end member as an example,
first, friction welding is a method in which, when two metal
materials are clamped by a friction welder while one side is fixed
and the other side is frictionally rotated back and forth at a high
speed of 2,000 rpm, binding of end portions becomes possible due to
high-temperature heat of 600 to 1,200.degree. C. generated at the
frictional surface, and then the rotation is suddenly stopped
instantaneously and the two materials are pressed with a strong
pressure to bind the two materials. When the first binding end
member is rapidly rotated while the first reinforcing bar is
clamped to rotate an end portion to be bound by bringing the end
portion to be bound in close contact with an end portion of the
first reinforcing bar to create friction with the end portion of
the first reinforcing bar, and binding of the end portion becomes
possible due to the high-temperature heat, the first binding end
member is pressed toward the first reinforcing bar in order to bind
the first binding end member to the first reinforcing bar. In the
actual binding, the end portion to be bound is preheated to easily
reach the high-temperature state, and natural binding is induced by
pressing the first binding end member even in a process of inducing
the high-temperature state.
[0189] Linear friction welding is a method of binding two materials
to be bound by linearly moving the materials back and forth, and
this method overcomes a weakness of friction welding in which any
one of the contact cross-sections needs to be circular. This method
is a useful friction binding method in binding to the first
reinforcing bar when the shape of the transverse cross-section of
the first binding end member is polygonal instead of circular in
the present invention.
[0190] The friction welding and the linear friction welding are
high-phase binding techniques in which energy required for binding
is obtained by mechanical means.
[0191] Next, the arc stud welding method is a method in which
binding is performed by generating an arc between a front end of a
stud bolt or a round bar, which is a component, and a base material
and pressing when welded portions are molten. An arc type and a
condenser type (C.D Type) are used. The arc type is useful in bolt
welding or pin welding because it mostly uses a power supply source
of 6-phase control, and the condenser type performs pin welding
mostly using a single-phase power supply device using a silicon
controlled rectifier (SCR). In the actual binding, the base
material is grounded to a negative electrode and a wire is
connected to a positive electrode to supply power and perform
welding. That is, the first binding end member may substitute a
stud member and ground a negative electrode to the first binding
end member as a stud and ground a positive electrode to the first
reinforcing bar to receive a current required for welding from a
stud welder in order to generate an arc by slightly spacing the
first binding end member while the welding current from the welder
is conducted after bringing an end portion of the first binding end
member in contact with an end portion of the first reinforcing bar,
and when melting occurs due to the high-temperature arc, press the
first binding end member again to enable welding of the molten
portion.
[0192] Referring to FIG. 18, to facilitate the arc generation
above, a groove may be formed at a center of an end portion surface
of the first binding end member to be welded for an ignition tip
970 that performs ignition to ignite an arc to be inserted and
installed. The ignition tip 970 is inserted and installed at the
center of the end portion surface of the first binding end member
to facilitate the arc generation even when the binding end member
is wide, thereby obtaining a high-quality welding surface. That is,
when the groove is formed at the center of the end portion surface
of the binding end member to be welded and the ignition tip 970
that performs ignition to ignite an arc is inserted and installed
at the center of the end portion surface of the binding end member,
binding occurs due to melting from the central portion due to the
ignition of the arc generation from the center of the end portion
surface even when the binding end member is wide, thereby obtaining
a high-quality welding surface. Also, a ceramic ferrule may be
installed to surround the end portion surface to be welded in order
to improve welding quality.
[0193] Description of the binding of the first binding end member
and the first reinforcing bar using butt welding, ultrasonic
vibration welding, resistance welding, plasma welding, electronic
beam welding, laser welding, high-frequency welding, and argon
welding will be omitted since those are technical configurations
that are obvious to those of ordinary skill in the field of welding
and joining of two base materials.
[0194] However, it is preferable that the end portion surface to be
bound including the end portion surface of the first binding end
member and the end portion surface of the first reinforcing bar be
precisely cut or have a cut end portion surface cut-processed using
a saw tool and a processing tool capable of shearing to improve
welding quality of a bound surface when binding by welding
regardless of which welding method is selected from the above
welding methods.
[0195] In addition, according to the present invention, end
portions of the first binding end members 120, 220, 330, 430, 530,
630, and 730 and the second binding end members 130, 230, 350, 440,
540, 640, and 740 are bound according to the above-mentioned
embodiment and are fastened by the fastening sockets 141 and 751
even when sizes of reinforcing bars to be joined are different,
i.e. when sizes of the first reinforcing bars 100, 200, 410, 610,
and 710 and the second reinforcing bars 110, 210, 420, 620, and 720
or sizes of the first threaded joint type reinforcing bars 310 and
510 and the second threaded joint type reinforcing bars 320 and 520
are different, and even with respect to a method of coupling
reinforcing bars of different types, thus enabling various types of
reinforcing bars to be joined.
[0196] Furthermore, with respect to a bar material including a
round bar capable of not only joining reinforcing bars but also
joining binding portions, the first binding end members 120, 220,
and 730, the second binding end members 130, 230, and 740, and the
middle binding members 250 and 760 may be bound even to an end
portion of the bar material including a round bar such that joining
of abutting bar materials having end portions facing each other
becomes possible. in accordance with embodiments.
[0197] For example, joining of adjacent bar materials having end
portions facing each other becomes possible when the first binding
end member 120 and the second binding end member 130 are bound to
the end portions of the bar materials in the first embodiment, when
the second binding end member 230 at one side and the middle
binding member 250 at the other side are bound to the end portions
of the bar materials in the second embodiment, when bar materials
having screws formed at end portions are helically coupled to the
first binding end member 430 and the second binding end member 440
in the fifth embodiment, and when the first binding end member 730
at one side and the middle binding member 760 at the other side are
bound to the end portions of the bar materials in the seventh
embodiment.
[0198] In the third to sixth embodiments according to the present
invention, when the first binding end member 330 and the second
binding end member 350 and the first threaded joint type
reinforcing bar 310 and the second threaded joint type reinforcing
bar 320 are respectively helically coupled, when the first binding
end member 430 and the second binding end member 440 and the first
reinforcing bar 410 and the second reinforcing bar 420 having male
screw portions formed at end portions are respectively helically
coupled, when the first binding end member 530 and the second
binding end member 540 and the first threaded joint type
reinforcing bar 510 and the second threaded joint type reinforcing
bar 520 are respectively coupled by being penetrated by insertion,
or when the first binding end member 630 and the second binding end
member 640 and the first reinforcing bar 610 and the second
reinforcing bar 620 having male screw portions formed at end
portions are helically coupled, in order to facilitate gripping of
a fastening tool, the transverse cross-sections of the first
binding end members 330, 430, 530, and 630 and the second binding
end member 350, 440, 540, and 640 may not be maintained in a
circular shape but made to form a polygonal shape up to a
predetermined section from an end portion surface or as a whole,
one pair or multiple pairs of grip surfaces forming parallel
surfaces may be disposed at positions facing each other, or knurl
processing or spline processing may be performed on the
predetermined section or as a whole.
[0199] For example, in the third embodiment, when the transverse
cross-section of the first binding end member 330 is formed in a
polygonal shape or one or more pairs of grip surfaces are disposed
to facilitate gripping of a tool when it is helically coupled to
the first threaded joint type reinforcing bar 310, the transverse
cross-section may be formed in a polygonal shape only up to
approximately 10 to 15 mm from an end portion surface toward the
first threaded joint type reinforcing bar 310 or only up to a point
at which the male screw portion for coupling the fastening socket
initially begins or one or more pairs of grip surfaces may be
disposed.
[0200] Likewise, in the fourth embodiment, when the transverse
cross-section of the first binding end member 430 is formed in a
polygonal shape to facilitate gripping of a tool when it is
helically coupled to the first reinforcing bar 410, the transverse
cross-section may be formed in a polygonal shape only up to
approximately 10 to 15 mm from an end portion surface toward the
first reinforcing bar 410 or only up to a point at which the male
screw portion for coupling the fastening socket initially begins or
one or more pairs of grip surfaces may be disposed.
[0201] In addition, even when outer surfaces of the second binding
end members 350, 440, 540, and 640 form a polygonal shape, the
transverse cross-sectional shapes of the second binding end members
350, 440, 540, and 640 are preferably circular in a section up to a
predetermined distance, e.g. approximately 10 to 15 mm, toward the
first reinforcing bar from steps of the second binding end members
or surfaces forming the steps. This is because an area that is
tightly supported when it is fastened and joined is the largest
when the transverse cross-section of the locking step of the
fastening socket forms a circular shape and the transverse
cross-section of the step with respect to the locking step forms a
circular shape and the two are brought in close contact, and thus a
cross-sectional area that tightly supports the shape of the locking
step is made larger than in an embodiment in which a polygonal
shape is formed to enable firm coupling in fastening by pressing,
and smooth rotation of the fastening socket in the fastening
tightening screw direction is possible when the fastening socket is
fastened.
[0202] In addition, in the first to seventh embodiments according
to the present invention, in formation of outer surfaces of the
fastening sockets 140, 240, 340, 450, 550, 650, and 750 and the
connection socket 770 according to the seventh embodiment, any case
selected from a case in which the transverse cross-sectional shape
is spline-processed, knurl-processed, circular or polygonal and a
case in which one pair or multiple pairs of grip surfaces facing
each other are disposed, thereby facilitating gripping of a tool or
rotating when fastening, may be adopted. The one pair or multiple
pairs of grip surfaces facing each other are parallel surfaces by
which a tool can be easily used for fastening, and they may be
formed at desired positions at the outer surfaces of the fastening
sockets 140, 240, 340, 450, 550, 650, and 750 or the connection
socket 770.
[0203] For example, in the case of the fastening sockets 140, 240,
340, 450, 550, 650, and 750, the spline processing and the knurl
processing may be performed on entire outer surfaces of the
fastening sockets 140, 240, 340, 450, 550, 650, and 750, or only up
to a predetermined distance, e.g. approximately 10 mm to 15 mm,
beginning from end portion surfaces of the fastening sockets 140,
240, 340, 450, 550, 650, and 750 toward the first reinforcing bar.
Also, even when the polygonal transverse cross-sectional shape and
one or more pairs of grip surfaces are disposed, the spline
processing and the knurl processing may be performed on the entire
outer surfaces of the fastening sockets 140, 240, 340, 450, 550,
650, and 750, or only up to a predetermined distance, e.g.
approximately 10 mm to 15 mm, from end portion surfaces of the
fastening sockets 140, 240, 340, 450, 550, 650, and 750 toward the
second reinforcing bar corresponding to outer surfaces of sections
where the locking steps are formed.
[0204] In addition, in each of the embodiments of the present
invention including the male screw portions 121, an 731 and the
female screw portions 141, 541, 641, and 751 for coupling the
fastening sockets, the male screw portions 251 and 761 and the
female screw portion 222 for coupling the middle binding members
and a screw of the lock nut body 260, the male screw portion 742
for coupling the connection socket of the first binding end member
and the second binding end member and the female screw portion 771
at the inner surface of the connection socket, screw threads
included in elements of the present invention may be formed with
screws having one or more screw threads for prevention of loosening
and prompt fastening. However, it is preferable that a
double-thread screw be used because a triple-thread screw may
loosen under tensioned.
[0205] The form of a screw may be any one form selected from a
triangular screw, a quadrangular screw, an elliptical screw, and a
round screw, and a class of a screw is any one selected from first
class which is a precise level, second class which is a middle
level, and third class which is a rough level, and although
second-class and third-class screws are used conventionally to form
couplers because a tightening work is not easy when the coupler is
formed with a first-class screw, the first-class screw may be used
in the socket fastening method of the present invention due to the
technical configuration formed to facilitate screw fastening of
screw threads. Also, a direction of a screw may be selected from a
left screw and a right screw depending on a fastening method.
[0206] The first binding end members 120, 220, 330, 430, 530, 630,
and 730, the second binding end members 130, 230, 350, 440, 540,
640, and 740, and the middle binding members 250 and 760 may be
manufactured by any one method selected from casting, forging,
cut-processing, and a three-dimensional printing formation
method.
[0207] Description of casting and forging methods will be omitted
since those are technical configurations obvious to those of
ordinary skill in methods of forming metal materials.
[0208] Meanwhile, referring to FIG. 9, in the cut-processing, in
manufacturing the accommodation unit of the first binding end
member and the second binding end member by cutting using a bit in
lathe processing, for example, processing is difficult due to
interference of the bit which is a tool when a shape of the
accommodation unit is a shape having a cross-sectional area
gradually decreasing toward a vertex, such as a cone. To solve
this, a recessed groove may be provided at a central portion of the
accommodation unit to perform cut processing while avoiding
interference of a tool using a processing recessed groove 975.
[0209] In addition, the three-dimensional printing formation method
is a method of completing formation of a three-dimensional form by
stacking cross-sections of a material using three-dimensional
cross-sectional shape data of the three-dimensional form. About
twenty formation methods including formation methods using a three
dimensional printing (3DP) system, a selective laser sintering
(SLS) system, and a stereo lithography apparatus (SLA) system are
known.
[0210] Particularly, in the SLS system, special metal powders,
which currently include 400-series stainless and 300-series
stainless powders, having a polymer binder thinly coated on a
surface are used. A three-dimensional form is formed by a process
of selectively radiating a laser beam to the applied metal powder
to melt the coated polymer binder and fix the powder, and melting a
bronze metal after a sintering heat treatment so that it permeates
into a product. The first binding end member, the second binding
end member, and the middle binding member of the present invention
may also be manufactured by the 3D printing formation methods using
a metal material.
[0211] The first binding end members 120, 220, 330, 430, 530, 630,
and 730, the second binding end members 130, 230, 350, 440, 540,
640, and 740, the fastening sockets 140, 240, 340, 450, 550, 650,
and 750, and the middle binding members 250 and 760 may be formed
of a metal material, and the stiffness thereof may be improved by a
heat treatment process after the first binding end members 120,
220, 330, 430, 530, 630, and 730, the second binding end members
130, 230, 350, 440, 540, 640, and 740, the fastening sockets 140,
240, 340, 450, 550, 650, and 750, and the middle binding members
250 and 760 are formed by the above-mentioned manufacturing
methods.
[0212] Meanwhile, referring to FIG. 17, in the first, second, and
seventh embodiments, when a longitudinal cross-sectional shape of
any one selected from end portion shapes forming the cone 810, the
truncated cone 820, the rounded cone 830, the cylinder, the
polygonal pyramid, the truncated polygonal pyramid 840, the rounded
polygonal pyramid, the polygonal column, the cut spherical shape,
and the cut elliptical-spherical shape 850 is formed to have
multiple stages, a contact area increases after the end portions of
the first binding end members 120, 220, and 730 and the second
binding end members 130, 230, and 740 are fitted to abut each
other, thereby causing an effect of distributing stress from the
axial compressive force.
[0213] When a longitudinal cross-sectional shape of any one
selected from the end portion shapes forming the cylinder, the
polygonal pyramid, the truncated polygonal pyramid 840, the rounded
polygonal pyramid, the polygonal column, the spherical shape, and
the cut elliptical-spherical shape 850 in the third to fourth
embodiments, the end portion shape of the first threaded joint type
reinforcing bar and the end portion shape of the second threaded
joint type reinforcing bar in the fifth embodiment, the end portion
shape of the first reinforcing bar 610 and the end portion shape of
the second reinforcing bar 620 forming the cone 810, the truncated
cone 820, the rounded cone 830, the cylinder, the polygonal
pyramid, the truncated polygonal pyramid 840, the rounded polygonal
pyramid, the polygonal column, the cut spherical shape, and the cut
elliptical-spherical shape in the sixth embodiment, and the end
portion shapes at which the male screw portion is formed at the end
portion is formed to have multiple stages, the end portions of the
first binding end members 330 and 430 and the second binding end
members 350 and 440 are fitted to abut each other, the end portions
of the first threaded joint type reinforcing bar 510 and the second
threaded joint type reinforcing bar 520 are fitted to abut each
other, and the end portions of the first reinforcing bar 610 and
the second reinforcing bar 620 having the male screw portion formed
at the end portion are fitted to abut each other, such that the
contact area increases, thereby causing an effect of distributing
stress from the axial compressive force.
[0214] Each of the stages forming the multiple stages may form any
one angle selected from an acute angle, a right angle, and an
obtuse angle such that the multiple stages are consecutive in a
layered form in accordance with a selected shape of the
longitudinal cross-section of the end portion shapes of the first
binding end member and the second binding end member and form a
shape that is gradient with a predetermined angle overall, or for
example, a layered form in which multiple stages formed with right
angles and obtuse angles sequentially continue may be formed.
[0215] In addition, although not illustrated, in the first to
seventh embodiments, screw threads exposed to the outside without a
protector may be corroded due to external influences in a process
of moving materials to a construction site or supplying and
managing materials at the construction site and may be recessed and
damaged by an impact applied thereto. Accordingly, a case in which
fastening itself is difficult due to the non-uniformity of screw
threads during a construction work occurs, and depending on
construction sites, screw threads become rusted when the materials
are stored outdoors and directly exposed to the outside. To solve
this, a protective cap for protecting screw threads may preferably
cover at least one selected from the male screw portion for
coupling the fastening socket of the first to seventh embodiments,
the female screw portion for coupling the fastening socket, the
male screw portion for coupling the middle binding member of the
second and seventh embodiments, the female screw portion for
coupling the middle binding member, the female screw portion for
coupling the threaded joint type reinforcing bar of the third
embodiment, the female screw portion for coupling the reinforcing
bar in which the male screw portion is formed at the end portion of
the fourth embodiment, the female screw portion for coupling the
threaded joint type reinforcing bar of the fifth embodiment, the
female screw portion for coupling the reinforcing bar in which the
male screw portion is formed at the end portion of the sixth
embodiment, the male screw portion for connecting the connection
socket of the seventh embodiment, and the female screw portion at
the inner surface of the connection socket.
[0216] The protective cap may have various embodiments. For
example, with respect to the male screw portion, a shrinking member
that shrinks by heat may cover a circumference of the male screw
portion of each of the embodiments to be shrunk by applying heat
such that screw threads are protected from damage due to corrosion
and impact caused by external influences in a state in which the
shrinking member comes in close contact with the male screw
portion, a member which is a hollow body with one open side may be
forcibly fitted into the male screw portion, female screw threads
may be formed at an inner surface of the member which is a hollow
body with one open side to cover the male screw portion of each of
the embodiments with a cap member formed of a synthetic resin
material or a rubber material to be helically coupled, or the
protective cap may be formed by an insulating tape surrounding and
adhering to the male screw portion. With respect to the female
screw portion, a cap member having a boss being coupled to the
female screw portion may be used. The boss may be forcibly fitted
on the female screw portion, or the male screw portion helically
coupled to the female screw portion may be formed at an outer
surface of the boss to cover the female screw portion with a cap
member formed of a synthetic resin material or a rubber material to
be helically coupled in order to minimize external contact of the
female screw portion and to block dust permeation and prevent
rust.
[0217] The present invention is not limited to the above-mentioned
embodiments, and technical configurations that may be easily
devised by those of ordinary skill in the art from the technical
spirit of the present invention should be construed as belonging to
the scope of equivalents of the present invention.
* * * * *