U.S. patent application number 11/128748 was filed with the patent office on 2005-11-24 for fastening element.
Invention is credited to Leibhard, Erich, Ludwig, Wolfgang.
Application Number | 20050260041 11/128748 |
Document ID | / |
Family ID | 35375303 |
Filed Date | 2005-11-24 |
United States Patent
Application |
20050260041 |
Kind Code |
A1 |
Ludwig, Wolfgang ; et
al. |
November 24, 2005 |
Fastening element
Abstract
A fastening element, which is used in particular in mines and/or
tunnel construction, includes an anchoring tube (2), a
squeezable-out, one-or multicomponent chemical mass contained in a
foil bag (5;25) arranged in the anchoring tube (2;2) between spaced
from each other, first stop (7,27) and second stop (9), and at
least one pressure application element (14) arranged between the
first stop (7,27) and/or the second stop (9) and a respective axial
end region (11,12;31) of the foil bag (5;25) for applying pressure
to the foil bag (5;25) in a shelf condition of the fastening
element (1;21)
Inventors: |
Ludwig, Wolfgang;
(Klosterlechfeld, DE) ; Leibhard, Erich; (Munich,
DE) |
Correspondence
Address: |
DAVID TOREN, ESQ.
ABELMAN FRAYNE & SCHWAB
666 THIRD AVENUE
NEW YORK
NY
10017-5621
US
|
Family ID: |
35375303 |
Appl. No.: |
11/128748 |
Filed: |
May 12, 2005 |
Current U.S.
Class: |
405/259.6 |
Current CPC
Class: |
F16B 13/146
20130101 |
Class at
Publication: |
405/259.6 |
International
Class: |
B65D 035/56 |
Foreign Application Data
Date |
Code |
Application Number |
May 13, 2004 |
DE |
10 2004-023 668.2 |
Claims
What is claimed is:
1. A fastening element, comprising an anchoring tube (2;22) having
a first end (3) and a second end (4); a squeezable-out, one-or
multicomponent chemical mass contained in a foil bag (5;25)
arranged in the anchoring tube (2;22) between spaced from each
other, first stop (7,27) and second stop (9); and at least one
pressure application element (14) arranged between one of the first
stop (7,27) and the second stop (9) and a respective axial end
region (11,12;31) of the foil bag (5;25) for applying pressure to
the foil bag (5;25) in a shelf condition of the fastening element
(1;21).
2. A fastening element according to claim 1, wherein the at least
one pressure application element (14) is formed as a spring
element.
3. A fastening element according claim 2, wherein the spring
element is formed as a helical spring (15).
4. A fastening element according to claim 1, further comprising a
drilling head (6) provided at the first end (3) of the anchoring
tube (2), wherein the first stop (7) is formed by a section of the
drilling head (6).
5. A fastening element according to claim 1, wherein the first stop
(27) is formed by mixing means (36) provided at the first end (3)
of the anchoring tube (2).
6. A fastening element according to claim 1, wherein the second
stop (9) is formed by a centering element (8) provided at the
second end (4) of the anchoring tube (2).
7. A fastening element according to claim 1, wherein the at least
one pressure application element (14) is provided between the
second stop (9) and the adjacent thereto, end region (12) of the
foil bag (5;25).
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a fastening element, in
particular for use in mine and/or tunnel constructions and
including an anchoring tube having first and second ends, and a
squeezable-out one-or multicomponent chemical mass which is
contained in a foil bag arranged in the anchoring tube between
spaced from each other, first and second stops.
[0003] 2. Description of Prior Art
[0004] Fastening elements, in particular for use in mine and tunnel
construction are generally known. They are used primarily as roof
bolts for stabilization of wall of hollow spaces of tunnels,
galleries and the like. The wall-forming, following each other rock
strata are secured to each other with fastening elements. Because
in many cases layers, which lie in an immediate vicinity of the
wall surface, have reduced mechanical characteristics, in
particular their bearing capacity, as a result of formation of
hollow spaces, the immediately adjacent to the wall surface, layers
or strata are secured to further located, undamaged layers or
strata.
[0005] German Publication DE-100 17 250 AI discloses a fastening
element of the type described above and including an anchoring tube
which is provided at one of its end with a drilling head and at an
opposite end with engagement means, e.g., for a drilling tool. A
foil bag, which contains a squeezable-out, one-or multicomponent
mass, is arranged in the anchoring tube between spaced from each
other, first and second stops. The first stop is formed in the
region of the first end of the anchoring tube by a mixing element,
and the second stop is formed in the region of the second end of
the anchoring tube by a pressing-out piston. The fastening element
is formed of separate elements. The drilling head has at least one
outlet channel for delivery of the chemical mass. The setting
process of the known fastening element is effected in two steps. In
the first step, the fastening element is drilled, e.g., with a
drilling tool in underground, in particular, rock. The removed,
comminuted stone, which is produced by the drilling head of the
fastening element, is removed through the intermediate space
between the wall of the bore and the outer circumference of the
fastening element. In a second step, the piston, which is provided
at the second end of the anchoring tube remote from the setting
direction end of the anchoring tube, is pressed further into the
anchoring tube, squeezing the chemical mass, which is stored in the
foil bag located in the anchoring tube, out into the bore through
the outlet channel that is provided in the drilling head.
[0006] The drawback of the fastening element which is disclosed in
DE-100 17 750AI, consists in that, in particular, during a long
shelf time of a fastening element, loss of the chemical mass takes
place as a result of a diffusion process in or through the foil
and, e.g., through the ends of the foil bag which are closed with
clips. During dispensing of the mass from the foil bag, the bag can
fold, obstructing or impairing the dispensing process. When
multicomponent masses are contained in a foil bag, the folding of
the foil bag can distort the mixing ratio of the components during
the dispensing process. This behavior of the foil bag leads to a
prohibitive bearing behavior of the fastening element or even to a
total collapse of the fastening element.
[0007] Accordingly, an object of the invention is to provide a
fastening element that can be perfectly set even after an extended
shelf life.
SUMMARY OF THE INVENTION
[0008] This and other objects of the present invention, which will
become apparent hereinafter, are achieved, according to the
invention, by providing at least one pressure application element
arranged between the first stop and/or the second stop and a
respective axial and region of the foil bag for applying pressure
to the foil bag in a shelf condition of the fastening element.
[0009] The at least one pressure application element applies a
permanent pressure to the chemical mass contained in the foil bag.
As a result, the foil of the foil bag is always deformed outwardly,
so that no hollows are formed in the foil bag, and no folding of
the foil bag during the squeezing-out or dispensing process takes
place. The pressure application element can be provided, e.g.,
between the first stop and the end region of the foil bag adjacent
to the first stop. Alternatively, the pressure application element
can be provided between the second stop and the end region of the
bag adjacent to the second stop. Also, a pressure application
element can be provided between each of the stops and a respective
end of the foil bag.
[0010] Advantageously, as a pressure application element, a spring
is used. The spring characteristic and the length of the spring are
so selected that during the entire predetermined shelf life of the
fastening element and the necessary tensioning displacement, a
sufficient pressure is applied to the foil bag and, thus, to the
chemical mass. Advantageously, as a spring, a helical spring is
used which is made, e.g., from spring steel. The dispensing means,
e.g., a pressing-out piston can, if needed, penetrate through the
spring, without the biasing force or the pressure applied to the
foil bag being reduced during the penetration of the dispensing
means through the spring and an effective beginning of the
dispensing process.
[0011] Instead of a spring, as a pressure application element, a
pressurized body, e.g., a gas-filled body or a body, which is
filled with a suitable fluid, can be provided between the first
and/or the second stop and a respective axial end region of the
foil bag for applying pressure to the foil bag in the shelf
condition of a fastening element. A ball-shaped body, e.g., can
have, advantageously, a destructible diaphragm which becomes
destroyed, directly or indirectly, during the dispensing process by
the dispensing device.
[0012] Preferably, the first stop is formed by a section of a
drilling head. The drilling head is secured at the first end of the
anchoring tube, with the first stop-forming section of the drilling
head extending into the anchoring tube. If the pressure application
element is allanged between the stop-forming section of the
drilling head and the adjacent thereto, end region of the foil bag,
the pressure application element can be supported against the
drilling head. If the pressure application element is provided
between, the second stop and the adjacent thereto, end region of
the foil bag, the foil bag, to which the pressure is applied, is
supported against the stop-forming section of the drilling head.
With the second arrangement, the region of the drilling head, which
is adjacent to the foil bag, advantageously, has a recess for
receiving a corresponding region of the foil bag, so that the foil
bag can flatly abut the support surface.
[0013] Alternatively, the first stop can be formed by mixing means
in which the separate components, which are squeezed out of the
foil bag, are used to form a finished chemical mass. The mixing
means is generally arranged between the drilling head and an
adjacent region of the foil bag, with the foil bag being supported
against the mixing means. The mixing means has an appropriate
receptacle for receiving the respective end region of the foil bag
so that the end region is flatly supported in the receptacle. When
the pressure application element is located at the mixing means, it
can be supported thereagainst.
[0014] Advantageously, the second stop is formed by a centering
element. The centering element aligns, e.g., the foil bag or a foil
bag-receiving member, such as inner tube, and retains the foil bag
or the foil bag-receiving member, during storage or during the
setting process, in the predetermined position in the anchoring
tube. When a foil bag-receiving member is used, an annular gap is
provided between the outer wall of the foil bag-receiving means and
the inner wall of the anchoring tube, which annular gap provides
for removal, e.g., by suction, of drillings which are produced
during the drilling process, or for feeding fluid to the drilling
head. The centering element is mounted on the second end of the
anchoring tube, with a section of the centering element extending
into the anchoring tube. In case, the pressure application element
is arranged between the section of the centering element which
extends into the anchoring tube and the adjacent end region of the
foil bag, the pressure application element can be supported against
the centering element. In case the pressure application element is
arranged between the first stop and the foil bag, it is the foil
bag that is supported against the centering element. In the later
case, the centering element has a receptacle for receiving the foil
bag and which is so formed that the foil bag is flatly received in
the receptacle.
[0015] Advantageously, the at least one pressure application
element is arranged between the second stop and the adjacent end
region of the foil bag. With this arrangement, during the
dispensing process, the foil bag is always folds away from its end
to which pressure is applied, so that an undesirable collapse of
the foil bag is reliably prevented. Advantageously, the end region
of the foil bag adjacent to the pressing-out piston is surrounded
by the piston at least region wise, with the pressure application
element being supported against the piston.
[0016] The novel features of the present invention, which are
considered as characteristic for the invention, are set forth in
the appended claims. The invention itself, however, both as to its
construction and its mode of operation, together with additional
advantages and objects thereof, will be best understood from the
following detailed description of preferred embodiments, when read
with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The drawings show:
[0018] FIG. 1 a longitudinal cross-sectional view of a first
embodiment of a fastening element according to the present
invention; and
[0019] FIG. 2 a longitudinal cross-sectional view of a second
embodiment of a fastening element according to the present
invention.
[0020] In both Figures, the same element are designated with the
same reference numerals.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0021] A fastening element 1 according to the present invention, a
first embodiment of which is shown in FIG. 1, includes an anchoring
tube 2 having a first end 3 and a second end 4, and a foil bag 5
containing a one-component chemical mass. A drilling head 6 is
secured on the first end 3 of the anchoring tube 2. The drilling
head 6 forms the first stop 7 for the foil bag 5. A centering
element 8 is pressed into the second end 4 of the anchoring tube 2.
The centering element 8 forms a second stop 9 for the foil bag 5.
The drilling head 6 has a receiving section 10 for supporting an
axial and region 11 of the foil bag 5 adjacent to the first stop 7.
In order to facilitate squeezing the chemical mass out, there is
provided, at the second end region 12 of the foil bag 5 adjacent to
the second stop 9, a pressing-out piston 13.
[0022] Between the pressing-out piston 13 and the centering element
8, there is provided a helical spring 15 that functions as pressure
application means 14 for applying pressure to the foil bag 5 both
in shelf condition of the fastening element 1 and during a setting
process when the fastening element 1 is being set in. The spring
characteristic and the length of the helical spring 15 are so
selected that with a diameter of the foil bag 5 of from 5 to 20 mm
and a follow-up displacement path of 80 mm and more, a pressure
applied by the helical spring 15 to the foil bag 5 is in a range
from 5 kg to 10 kg.
[0023] A fastening element 21 according to a second embodiment of
the present invention, which is shown in FIG. 2, is substantially
similar to the fastening element shown in FIG. 1, so that many of
the above-discussed elements are also present in the fastening
element 21. In distinction from the fastening element 1, the
anchoring tube 22 of the fastening element 21 is filled with a
multicomponent chemical mass that is stored in a foil bag 25. The
components of the chemical mass are mixed, during the squeezing-out
process and before exciting the drilling head 26, to a finished
mass in a mixing device 36. The first stop 27 for the axial end
region 31 of the foil bag 25 adjacent to the mixing device 36, is
formed by a receptacle 30 of the mixing device 36. As in the
fastening element 1, pressure application means 14, which is formed
as the helical spring 15, is arranged between the pressing-out
piston 13 or the axial end region 12 of the foil bag 12 and the
centering element 8.
[0024] Though the present invention was shown and described with
references to the preferred embodiments, such are merely
illustrative of the present invention and are not to be construed
as a limitation thereof, and various modifications of the present
invention will be apparent to those skilled in the art. It is,
therefore, not intended that the present invention be limited to
the disclosed embodiments or details thereof, and the present
invention includes all variations and/or alternative embodiments
within the spirit and scope of the present invention as defined by
the appended claims.
* * * * *