U.S. patent application number 09/824698 was filed with the patent office on 2001-08-16 for jacket tube for a drilling and anchoring device.
Invention is credited to Bohm, Karl, Mocivnik, Josef.
Application Number | 20010013427 09/824698 |
Document ID | / |
Family ID | 3518213 |
Filed Date | 2001-08-16 |
United States Patent
Application |
20010013427 |
Kind Code |
A1 |
Mocivnik, Josef ; et
al. |
August 16, 2001 |
Jacket tube for a drilling and anchoring device
Abstract
The invention relates to a jacket tube (6) for a device for
drilling holes and forming an anchorage in the earth or rock. The
inventive jacket tube (6) is coupled with a drill pipe (3) and/or a
drill bit (1) or a drill hammer and is configured with a plurality
of through openings across its periphery. Once the borehole (2) has
been made, or after an anchor has been introduced, the jacket tube
can be filled with a hardenable suspension. According to the
invention, the jacket tube consists of at least one expanded metal
element (6) which has evenly distributed through openings (9) and
connecting elements (7, 8), especially sleeves, at the ends for
connecting to a drill bit (1) and/or other jacket tube elements
(6). The borehole (2) is therefore easy to produce and the jacket
tube (6) can be anchored securely.
Inventors: |
Mocivnik, Josef; (Fohnsdorf,
AT) ; Bohm, Karl; (Ansfelden, AT) |
Correspondence
Address: |
JACOBSON, PRICE, HOLMAN & STERN
PROFESSIONAL LIMITED LIABILITY COMPANY
THE JENIFER BUILDING
400 SEVENTH STREET, N.W.
WASHINGTON
DC
20004
US
|
Family ID: |
3518213 |
Appl. No.: |
09/824698 |
Filed: |
April 4, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09824698 |
Apr 4, 2001 |
|
|
|
PCT/AT99/00237 |
Oct 4, 1999 |
|
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Current U.S.
Class: |
175/230 ;
175/314 |
Current CPC
Class: |
E21D 21/0026 20130101;
E21D 21/0033 20130101; E21D 21/0053 20160101 |
Class at
Publication: |
175/230 ;
175/314 |
International
Class: |
E21B 017/10 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 5, 1998 |
AT |
A 1659/98 |
Claims
1. A jacket tube for a device for drilling holes and forming an
anchorage in soil or rock material, wherein the jacket tube is
coupled with a drill rod assembly and/or a drill bit or a drilling
hammer, respectively, and is formed with a plurality of passage
openings about its circumference and capable of being filled with a
curable suspension after completion of the drill hole or after
insertion of a roof bolt, wherein the jacket tube is formed of at
least one expanded metal element provided with uniformly
distributed passage openings and comprising, on its ends,
connecting elements, in particular sleeves, for connection with the
drill bit and/or further jacket tube elements.
2. A jacket tube according to claim 1, wherein the passage openings
of the expanded metal element have substantially rhomboidal or
lozenged contours.
3. A jacket tube according to claim 1, wherein the expanded metal
element has a grid-like or wire netting-like structure.
4. A jacket tube according to claim 1, wherein an annular space is
defined by spacers arranged between the jacket tube and the drill
rod assembly or roof bolt, respectively, in particular sleeve
elements provided in the end regions of the expanded metal
element(s).
5. A jacket tube according to claim 1, wherein the jacket tube is
designed in several layers with a synthetic tube being provided
between expanded metal elements designed with passage openings and
arranged on the inner and outer surfaces, viewed in the radial
direction.
6. A jacket tube according to claim 5, wherein the synthetic tube
is designed with a plurality of outlet openings opening and
closeable merely in the direction towards the outer side of the
jacket tube.
7. A jacket tube according to claim 5, wherein the connecting
elements formed by sleeves have stepped contours or contours formed
with offset regions, on which the internally and externally
arranged expanded metal elements and the intermediate synthetic
tube are fixable.
8. A jacket tube according to claim 1, wherein the jacket tube
under tensile actuation is capable of being coupled with the drill
bit or the drilling hammer, respectively, optionally by interposing
a coupling element, in particular an impact shoe acting on the
drill bit.
Description
[0001] The present invention is a continuation application of
PCT/AT99/00237, filed Oct. 4, 1999.
FIELD OF THE INVENTION
[0002] The present invention relates to a jacket tube for a device
for drilling holes and forming an anchorage in soil or rock
material, wherein the jacket tube is coupled with a drill rod
assembly and/or a drill bit or a drilling hammer, respectively, and
is formed with a plurality of passage openings about its
circumference and capable of being filled with a curable suspension
after completion of the drill hole or after insertion of a roof
bolt.
DESCRIPTION OF THE PRIOR ART
[0003] Devices for drilling and, in particular, impact drilling or
rotary percussion drilling and subsequently lining holes in soil or
rock material are known in various configurations. Thereby, a hole
or a bore optionally extending over a great length is formed by the
aid of a drill bit mounted on a drill rod assembly, the drill hole
being formed by a percussive and/or rotary movement. In order to
prevent material from breaking into the drill hole optionally
extending over a great length and/or be able to provide a lining
after completion of the bore, it was, for instance, proposed to use
a jacket tube surrounding the drill rod assembly, which is
introduced during the drilling procedure.
[0004] After completion of the bore, an anchor or roof bolt may,
for instance, be inserted into the jacket tube or the drill rod
assembly may directly be employed as an anchoring means and a
rapidly setting suspension may be introduced for strengthening the
surrounding material.
[0005] A device comprising a jacket tube of the initially defined
type may be taken, for instance, from WO 98/21439, in which a
process and a device for drilling and lining holes is disclosed. By
means of a jacket tube that surrounds a drill rod assembly
actuating a drill bit, an annular space is provided between the
jacket tube and the external periphery of the drill rod assembly,
wherein, for instance, in the region following immediately upon the
drill bit, at least one passage opening is provided in the
substantially solid jacket tube, via which passage opening worked
material can optionally be removed from the drill hole to be
produced and a curable suspension can be discharged into the
surrounding material for forming an anchorage.
[0006] Instead of introducing a jacket tube along with the
formation of the drill hole, methods have, moreover, become known
in which, after completion of the drill hole, the drill bit is
removed from the drill hole and a lining or jacket tube is
subsequently inserted into the drill hole in a time-consuming
multiple-step operation. Jacket tubes or sleeve-like inserts for
such linings of drill holes may, for instance, be taken from DE-B
21 33 593, AT-B 329 487 or AT-B 262 196. It is apparent that such a
mode of procedure is applicable only in those cases in which the
breaking in of material into the finished drill hole can be
excluded for sure, wherein, in addition, an accordingly enlarged
cross section must be drilled in order to enable the subsequent
insertion of the lining or jacket tube. In order to be able to
insert such a lining or jacket tube of great length, that tube, in
turn, must have a relatively large wall thickness in order to
enable its safe insertion such that a drill bit having a relatively
large diameter adapted to the dimensions of the jacket tube must be
employed.
[0007] For the proper anchorage of a roof bolt as well as the
jacket tube surrounding the roof bolt after ejection of a curable
suspension, an accordingly stable connection with the surrounding
material is, however, additionally required in order to be able to
reliably avoid any unintentional removal of the roof bolt under an
accordingly high load. In this context, the known embodiments of
jacket tubes such as, for instance, of WO 98/21439 involve the
drawback that they have substantially smooth surfaces, being
usually made of steel or synthetic elements, such that even upon
introduction of a suspension through a plurality of passage
openings provided in the jacket tube a partially only local
penetration of the curable suspension into the surrounding material
is rendered feasible and a substantially smooth or plane interface
will be obtained between the suspension and the external surfaces
of the jacket tube, thus partially strongly impairing the anchoring
effect, in particular in the region of the jacket tube.
SUMMARY OF THE INVENTION
[0008] The present invention aims at providing a jacket tube of the
initially defined kind, wherein, in addition to the rapid and
simple lining of a drill hole by simultaneously inserting a jacket
tube, a reliable anchorage or additional reinforcement of a roof
bolt to be inserted into the jacket tube, or of a drill rod
assembly employed as a roof bolt, will be obtained subsequently by
introducing a curable suspension discharged at least partially into
the material surrounding the drill hole with the jacket tube being
securely anchored. To solve these objects, the jacket tube
according to the invention is essentially characterized in that the
jacket tube is formed of at least one expanded metal element
provided with uniformly distributed passage openings and
comprising, on its ends, connecting elements, in particular
sleeves, for connection with the drill bit and/or further jacket
tube elements. Due to the fact that, according to the invention,
the jacket tube is formed of at least one expanded metal element
which is provided with a plurality of passage openings uniformly
distributed about its circumference, the large-surface discharge of
the curable suspension into the surrounding material after
completion of the drill hole for setting a roof bolt is safely
feasible such that an accordingly safe anchorage of the roof bolt
and of the jacket tube will be obtained. In addition, the design of
the jacket tube with at least one expanded metal element ensures
that the jacket tube does not have a completely plane, smooth
external surface so that, upon introduction of the curable
suspension, the anchoring effect within the surrounding material
after curing of the suspension will be accordingly enhanced due to
the inherent surface structure of the expanded metal element or
inherent roughness of the surfaces of the expanded metal element.
If bores extending over major lengths are provided, a jacket tube
that is subdivided over its longitudinal extension will be employed
in a manner known per se such that several consecutively arranged
expanded metal elements will each be mutually connected by suitable
connecting elements or immediately join the drill bit. By using an
expanded metal element having an appropriate number of passage
openings, a high elasticity of the jacket tube may be ensured by
the insertion of the jacket tube during the drilling procedure such
that the drilling procedure will not be hampered and a force
distribution over the entire jacket tube will be obtained.
Furthermore, after casting of a curable suspension, an additional
armoring effect covering the total length of the jacket tube may be
obtained by the expanded metal upon safe anchorage within the
surrounding material via the rough surface such that the jacket
tube and the roof bolt optionally received therein will fit closely
after solidification, wherein, due to the enhancement of the
anchoring or reinforcing effect by the expanded metal, it may in
some cases be feasible to do with less heavily dimensioned roof
bolts and hence optionally smaller dimensioned drill holes, which,
in turn, leads to material saving and reduced drilling work.
[0009] In order to obtain a large passage cross section for the
curable suspension as well as for an accordingly good anchoring
effect, it is provided according to a preferred embodiment that the
passage openings of the expanded metal element have substantially
rhomboidal or lozenged contours. By such rhomboidal or lozenged
contours of the passage openings, it is additionally ensured during
the drilling procedure that the passage openings will not be
completely obstructed and blocked by worked material, which, as a
rule, has a substantially rounded or spherical shape. In this
context, it is moreover contemplated in a particularly preferred
manner that the expanded metal element has a grid-like or wire
netting-like structure, from which an accordingly large clear
passage area relative to the material cross section remaining
between the individual passage openings and a high elasticity
during introduction under the simultaneous achievement of an
enhanced reinforcement and anchoring effect upon casting and curing
of the suspension result.
[0010] In order to provide for proper guidance of the jacket tube
comprised of at least one expanded metal element relative to the
drill rod assembly or a roof bolt to be set subsequently, it is
proposed that an annular space is defined by spacers arranged
between the jacket tube and the drill rod assembly or roof bolt,
respectively, in particular sleeve elements provided in the end
regions of the expanded metal element(s), as in correspondence with
a further preferred embodiment of the device according to the
invention.
[0011] While the use of an expanded metal element for the formation
of a jacket tube allows for the realization of accordingly large
passage cross sections for curable material to be introduced
subsequently and the achievement of an appropriate reinforcement
and anchoring effect, the plurality of passage openings in some
cases may bear the risk of water or moisture penetrating from the
surrounding material into the region of the roof bolt, which may
cause damage to the roof bolt by corrosion if the roof bolt remains
within the drill hole, for instance, for several years. In order to
provide for an additional protection against the penetration of
moisture to the roof bolt, it is, therefore, proposed according to
another preferred embodiment of the invention that the jacket tube
is designed in several layers with a synthetic tube being provided
between expanded metal elements designed with passage openings and
arranged on the inner and outer surfaces, viewed in the radial
direction. Due to that sandwich construction proposed according to
the invention in a preferred manner and comprised of externally
arranged expanded metal elements and an intermediate synthetic
tube, the properties of the expanded metal element that are
decisive for the enhanced anchoring effect can be utilized while
largely minimizing the penetration of moisture towards the roof
bolt, and hence the risk of corrosion, via the synthetic tube. For
discharging a suspension aimed at subsequent anchoring, the
synthetic tube must, of course, be provided with suitable passage
openings, wherein, in this context, it is contemplated in a
particularly preferred manner that the synthetic tube is designed
with a plurality of outlet openings opening and closeable merely in
the direction towards the outer side of the jacket tube such that
the reliable discharging of the curable suspension into the
surrounding region is ensured by such closeable outlet openings or
openings opening by virtue of a valve effect merely in the
direction outwards of the drill hole while avoiding the penetration
of moisture. In that manner, an accordingly safe anchorage may
again be obtained in the surrounding material, which, for instance,
is formed by what is called overlay rock or loose rock, wherein,
after curing of the suspension, the inherent roughness of the
expanded metal elements again ensure an accordingly good anchoring
effect and, at the same time, a sealing against possibly present
moisture by means of the synthetic tube.
[0012] In particular with a jacket tube comprised of a multilayer
sandwich structure, it is proposed according to another preferred
embodiment relating to the connecting elements or sleeves that the
connecting elements formed by sleeves have stepped contours or
contours formed with offset regions, on which the internally and
externally arranged expanded metal elements and the intermediate
synthetic tube are fixable.
[0013] In order to enable the, in particular multilayer, jacket
tube to be readily entrained during the drilling procedure, thereby
providing an appropriate protective effect for the drill rod
assembly already during the drilling procedure, it is, moreover,
provided in a preferred manner that the jacket tube under tensile
actuation is capable of being coupled with the drill bit,
optionally by interposing a coupling element, in particular an
impact shoe acting on the drill bit.
SHORT DESCRIPTION OF THE DRAWINGS
[0014] In the following, the invention will be explained in more
detail by way of exemplary embodiments schematically illustrated in
the annexed drawing. Therein:
[0015] FIG. 1 is a partially sectioned schematic side view of a
jacket tube according to the invention for a device for drilling
with parts of the drilling device being indicated in addition;
[0016] FIG. 2 is a side view of a jacket tube according to the
invention produced of an expanded metal element; and
[0017] FIG. 3 on an enlarged scale shows a partial section through
a modified embodiment of a multilayer jacket tube according to the
invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
[0018] FIG. 1 schematically depicts a drill bit 1 for forming a
drill hole whose outer contour is indicated by 2, a schematically
indicated drill rod assembly 3 being used for actuating the drill
bit 1. Immediately with the drill bit 1 on the side facing away
from the drilling elements 4, or the impact shoe 5 of the drill bit
1, is provided a jacket tube 6, wherein the jacket tube 6, as is
particularly clearly apparent from FIG. 2, is comprised of expanded
metal elements which, on their end regions, are each designed with
sleeve elements 7 and 8 for connection with the drill bit 1, or
impact shoe 5, as well as adjacent jacket tube elements 6. The
sleeve elements 7, 8 may be designed with a view to obtaining an
appropriate plug-in or screw connection in order to enable the
appropriate extension of the jacket tube 6 similar to the extension
of the drill rod assembly 3, in particular in case of a
large-dimensional drill hole.
[0019] Such a jacket tube or expanded metal element 6 is clearly
illustrated a second time in FIG. 2, wherein it is apparent that
the passage openings uniformly distributed about the circumference
of the jacket tube 6 formed by the expanded metal element each have
substantially rhomboidal or lozenged contours 9 resulting in an
altogether grid-shaped or mesh-like structure of the surface of the
jacket tube 6.
[0020] After completion of the bore 2, either the drill rod
assembly 3 is used directly as an anchor or roof bolt or a separate
roof bolt is inserted into the completed bore 2 and into the
interior of the jacket tube 6 after removal of the drill rod
assembly 3 with at least parts of the drill bit 1, whereupon a
curable suspension is introduced into the interior of the jacket
tube 6, which is able to emerge into the surrounding material
through the passage openings 9 formed in the expanded metal element
6. After curing of the suspension, an extremely resistant anchorage
has been realized in the completed drill hole 2, the anchoring
effect being supported, in particular, by the not completely plane
surface structure of the expanded metal element 6 enabling an
accordingly secure anchorage even of the jacket tube 6 by
developing an additional reinforcement effect besides the anchorage
of the roof bolt in the hardened suspension.
[0021] FIG. 3 on an enlarged scale shows a partial section through
a modified embodiment of a jacket tube schematically indicated by
10, the multilayer jacket tube 10 being formed by an externally
arranged expanded metal element 11 again provided with a plurality
of openings, an internally arranged expanded metal element 12
provided with openings, and an intermediately provided synthetic
tube or element 13. The expanded metal elements 11 and 12 again are
configured or made in a manner similar to the expanded metal
element 6 illustrated in FIGS. 1 and 2, comprising a plurality of
rhomboidal or lozenged passage openings 9. By contrast, the
intermediately arranged synthetic tube 13 is designed to have a
reduced number of passage openings, wherein FIG. 3 depicts one of
the openings 14, which, in the sense of a valve effect, enables the
passage of a suspension to be discharged subsequently merely in the
direction indicated by the arrow 15. In the embodiment illustrated
in FIG. 3, it is thus ensured that after the introduction of a
suspension for the formation of an anchorage no moisture or water
may enter from the surrounding material in the direction towards
the drill rod assembly 3 or a roof bolt to be placed instead of the
drill rod assembly 3, thus avoiding the effect of corrosion and
allowing the production of roof bolts that are capable of remaining
within the drill hole for a great number of years.
[0022] In the embodiment illustrated in FIG. 3 of the jacket tube
10, a modified embodiment of a sleeve 16 including offset or
stepped regions 17 is used in order to enable the fixation of the
individual layers or elements 11, 12 and 13 for the formation of
the sandwich structure of the jacket tube 10. Moreover, an
additional spacer or projection of the sleeve element 18 is
indicated in FIG. 3 in order to enable appropriate positioning
relative to the drill rod assembly 3 or a roof bolt to be set, the
central line of the overall construction each being indicated by 19
in all of the Figures.
* * * * *