U.S. patent application number 14/235098 was filed with the patent office on 2014-06-05 for self-drilling friction bolt.
This patent application is currently assigned to FCI HOLDINGS DELAWARE, INC.. The applicant listed for this patent is Mauricio Antonio Hidalgo Salgado. Invention is credited to Mauricio Antonio Hidalgo Salgado.
Application Number | 20140154017 14/235098 |
Document ID | / |
Family ID | 50382848 |
Filed Date | 2014-06-05 |
United States Patent
Application |
20140154017 |
Kind Code |
A1 |
Hidalgo Salgado; Mauricio
Antonio |
June 5, 2014 |
SELF-DRILLING FRICTION BOLT
Abstract
A reinforcement system includes an adapter, a friction bolt, a
drilling rod coupled to the adapter, and a drill bit configured to
drill an opening optimally sized for receiving the friction bolt.
The drilling rod has a diameter that allows for introduction of the
drilling rod into the friction bolt.
Inventors: |
Hidalgo Salgado; Mauricio
Antonio; (Santiago, CL) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hidalgo Salgado; Mauricio Antonio |
Santiago |
|
CL |
|
|
Assignee: |
FCI HOLDINGS DELAWARE, INC.
Wilmington
DE
|
Family ID: |
50382848 |
Appl. No.: |
14/235098 |
Filed: |
August 22, 2012 |
PCT Filed: |
August 22, 2012 |
PCT NO: |
PCT/US12/51852 |
371 Date: |
January 27, 2014 |
Current U.S.
Class: |
405/259.1 |
Current CPC
Class: |
E21D 21/004 20130101;
E21D 21/0053 20160101 |
Class at
Publication: |
405/259.1 |
International
Class: |
E21D 21/00 20060101
E21D021/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 23, 2011 |
CL |
2065-2011 |
Claims
1. A reinforcement system comprising: an adapter; a friction bolt;
a drilling rod coupled to the adapter, the drilling rod having a
diameter that allows for introduction of the drilling rod into the
friction bolt; and a drill bit configured to drill an opening
optimally sized for receiving the friction bolt.
2. The reinforcement system of claim 1, wherein the adapter
includes first and second threaded portions and a neck that acts as
a guide and impact element for installing the friction bolt.
3. The reinforcement system of claim 2, wherein the first threaded
portion of the adapter is positioned at one end of the adapter and
the second threaded portion is positioned at the other end of the
adapter.
4. The reinforcement system of claim 2, wherein the drilling rod
includes a threaded portion engaged with the second threaded
portion of the adapter.
5. The reinforcement system of claim 4, wherein the adapter defines
a central passageway along the entire length of the adapter to
enable circulation of water or air from a drilling machine.
6. The reinforcement system of claim 3, wherein the friction bolt
defines a passageway that receives a portion of the drilling
rod.
7. The reinforcement system of claim 2, wherein the drilling rod is
coupled to the drill bit.
8. The reinforcement system of claim 2, wherein the drill bit
defines a polygonal-shaped recess and the drilling rod includes a
polygonal-shaped projection, the polygonal-shaped recess of the
drill bit is configured to receive the polygonal-shaped projection
of the drilling rod.
9. A method of installing a friction bolt comprising: drilling a
borehole using a drill bit coupled to a drilling rod, the drilling
rod coupled to an adapter; and installing a friction bolt
simultaneously while drilling the borehole.
10. The method of claim 9, further comprising removing the adapter
and the drill rod from the friction bolt.
11. The method of claim 10, further comprising leaving the drill
bit in the borehole.
12. The method of claim 9, wherein the friction bolt is installed
by impacting the friction bolt while drilling the borehole.
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of Chilean Patent
Application No. 2065-2011, filed Aug. 23, 2011.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to reinforcement systems and,
more particularly, to a self-drilling friction bolt for mining and
civil applications.
[0004] 2. Description of Related Art
[0005] There are various reinforcement techniques and elements
currently in use for strata control. Reinforcement systems can be
classified in a variety of ways. Reinforcement systems can be
classified according to work force, including Passive Anchors (ref.
Antonio Ros, Dissertation project, pg. 142); Active Anchors (ref.
Antonio Ros, Dissertation project, pg. 142); and Mixed Anchors
(ref. Antonio Ros, Dissertation project, pg. 142). Reinforcement
systems can also be classified according to the support mechanism,
including Adherence Anchors (ref. Antonio Ros, Dissertation
project, pg. 142) and Friction Anchors (ref. Antonio Ros,
Dissertation project, pg. 142). With Adherence Anchors, the annular
space between the bolt and the perforation or borehole is filled
with mortar made out of resin or cement, which, upon setting,
ensures sufficient adherence to solidify the rod to the ground.
Friction bolt arrangements make use of the resistance generated
against the rock as their fastening method, taking advantage of the
friction or rubbing between the rock and the element as the latter
is deformed during installation made through impact with a shank or
adapter. The conventional way in which these elements are installed
is as follows: first, drilling takes place in the rock using a
suitable drilling system, followed by placement of the bolt in the
machine that installs it. The bolt is positioned in the newly made
perforation and percussion installs the element.
SUMMARY OF THE INVENTION
[0006] For strata control tasks in both mining and civil
applications, reinforcement systems are required that provide
greater reliability and improved installation times, thus
increasing safety and reducing the time involved in performing
these duties.
[0007] One embodiment of the present invention relates to a
reinforcement system that employs the principle of a friction bolt,
self-installed or self-drilled, thus simplifying previous tasks
associated with current conventional systems that initially involve
suitable drilling, followed by the bolt's installation in the
recently made perforation.
[0008] In one embodiment, a reinforcement system includes an
adapter, a friction bolt, a drilling rod coupled to the adapter,
and a drill bit configured to drill an opening optimally sized for
receiving the friction bolt. The drilling rod has a diameter that
allows for introduction of the drilling rod into the friction
bolt.
[0009] The adapter of the reinforcement system may include first
and second threaded portions, and a neck that acts as a guide and
impact element for installing the friction bolt. The first threaded
portion of the adapter may be positioned at one end of the adapter,
with the second threaded portion positioned at the other end of the
adapter. The drilling rod may include a threaded portion engaged
with the second threaded portion of the adapter. The adapter may
define a central passageway along the entire length of the adapter
to enable circulation of water or air from a drilling machine. The
friction bolt may define a passageway that receives a portion of
the drilling rod. The drilling rod may be coupled to the drill bit.
The drill bit may define a polygonal-shaped recess and the drilling
rod may include a polygonal-shaped projection, with the
polygonal-shaped recess of the drill bit configured to receive the
polygonal-shaped projection of the drilling rod.
[0010] In a further embodiment, a method of installing a friction
bolt includes drilling a borehole using a drill bit coupled to a
drilling rod, with the drilling rod coupled to an adapter, and
installing a friction bolt simultaneously while drilling the
borehole. The method may further include removing the adapter and
the drill rod from the friction bolt. The method may further
include leaving the drill bit in the borehole. The friction bolt
may be installed by impacting the friction bolt while drilling the
borehole.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a perspective view of a self-drilling friction
reinforcement system according to one embodiment of the present
invention.
[0012] FIG. 2 is an exploded perspective view of the system of FIG.
1.
[0013] FIG. 3 is a perspective view of a shank or adapter according
to one embodiment of the present invention.
[0014] FIG. 4 is a cross-sectional view of the shank or adapter of
FIG. 3 showing the threads contained within and the impact area for
the friction bolt.
[0015] FIG. 5 is a perspective view of a modified drill rod
according to one embodiment of the present invention.
[0016] FIG. 6 is a perspective view of a friction bolt according to
one embodiment of the present invention.
[0017] FIG. 7A is a perspective view of a rock drill bit according
to one embodiment of the present invention showing the water cut
detail.
[0018] FIG. 7B is a further perspective view of the rock drill bit
of FIG. 7A showing the rod connection.
[0019] FIG. 8 is a top view of the rock drill bit of FIG. 7A
showing the distribution of hardened inserts, such as tungsten.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] For purposes of the description hereinafter, the terms
"upper", "lower", "right", "left", "vertical", "horizontal", "top",
"bottom", and derivatives thereof, shall relate to the invention as
it is oriented in the drawing figures. However, it is to be
understood that the invention may assume various alternative
variations and step sequences, except where expressly specified to
the contrary. It is also to be understood that the specific devices
and processes illustrated in the attached drawings, and described
in the following specification, are simply exemplary embodiments of
the invention. Hence, specific dimensions and other physical
characteristics related to the embodiments disclosed herein are not
to be considered as limiting.
[0021] One embodiment of the present invention is a system that
enables optimal drilling and the installation of friction bolts,
which are well known and employed in the sector, in a simultaneous
fashion, subsequently enabling recovery of the devices employed
after the maneuver. These are the shank and the drilling rod, in
order that they may be subsequently employed in the installation of
more friction bolts. The only thing lost in the installation
process is the drill bit responsible for breaking the rock. The
system shall be described below in detail.
[0022] Referring to FIGS. 1-8, a reinforcement system, including a
self-drilling friction bolt, according to one embodiment is
disclosed. This system incorporates the typical characteristics of
a friction bolt, adding to it the capability to simultaneously
drill rock while it is installed, generating the work load
instantaneously, and eliminating the need to drill before
installing the bolt, as is currently done in the conventional
installation of this type of element. The system includes a shank
1, a friction bolt 2, a drilling rod 3, and a drill bit 4.
[0023] Referring to FIG. 4, the shank 1 includes a first threaded
portion 12 for receiving a drilling machine (not shown), a central
passageway 13 to enable the necessary flow of air and water to
execute drilling from the drilling machine, and a second threaded
portion 14 for receiving the drilling rod 3. The shank 1 further
includes a neck or rabbet 11 that acts as an impact zone to be able
to install the friction bolt 2.
[0024] Referring to FIG. 5, the drilling rod 3 is a steel rod
having a threaded portion 33 at one end that is received by the
second threaded portion 14 of the shank 1 and a polygonal-shaped
projection 31, such as a square-shaped projection, at the opposite
end of the rod 3 that is configured to receive the drill bit 4,
shown in FIG. 7B. Furthermore, the rod 3 defines a central
passageway 32 along its entire length, with the goal of enabling
the circulation of air or water needed in the drilling operation.
The rod 3 has a diameter that allows for its insertion along the
interior of the friction bolt 2, as shown in FIG. 1.
[0025] Referring to FIG. 6, the friction bolt 2 is an elongate body
defining a central passageway 16 and having a longitudinal slit 18
to allow the friction bolt 2 to compress upon installation, thereby
securing the friction bolt 2 within a borehole via friction.
[0026] Referring to FIGS. 7A, 7B, and 8, the rock drill bit 4 has
the needed diameter to obtain a perforation or borehole in the
rock, such that maximum resistance can be achieved in terms of the
load by the friction bolt 2. The drill bit 4 defines cavities or
perforations 41 aimed at enabling the flow of air or water
traveling through the system's interior, which is needed to remove
the loose material generated during the drilling process. The drill
bit 4 has a polygonal-shaped recess 43, such as a square-shaped
recess, that fits the corresponding polygonal-shaped projection 31
of the drilling rod 3. The rock drill bit 4 further includes
hardened material inserts 42, such as tungsten carbide, for
breaking through rock. In one non-limiting embodiment, three of the
inserts 42 are arranged in a wider diameter and two of the inserts
42 are arranged in the center, specifically on the flat face as
shown in FIG. 8, which enables drilling through rock with the
required diameter.
[0027] Referring to FIG. 1, the system is used by engaging the
first threaded portion 12 of the adapter or shank 1 with a drilling
machine (not shown) and drilling a borehole in strata with the
drill bit 4. As noted above, water or air may be used to clear the
drilled strata via the passageway 13 of the adapter 1, the central
passageway 32 of the drilling rod 3, and the cavities 41 of the
drill bit 4. The friction bolt 2 is simultaneously installed while
the borehole is being drilled by impacting the friction bolt 2 with
the neck 11 of the adapter 1. After drilling the borehole, the
adapter 1 and the drilling rod 3 are uncoupled from the drill bit 4
and removed from the friction bolt 2. In particular, the drilling
rod 3 is removed from the passageway 16 of the friction bolt 2.
Thus, the drilling rod 3 and the adapter 1 can be subsequently used
for further installations, while only leaving the drill bit 4 in
the borehole.
* * * * *