WO1998057035A1 - A rock bolt - Google Patents

A rock bolt Download PDF

Info

Publication number
WO1998057035A1
WO1998057035A1 PCT/GB1998/001569 GB9801569W WO9857035A1 WO 1998057035 A1 WO1998057035 A1 WO 1998057035A1 GB 9801569 W GB9801569 W GB 9801569W WO 9857035 A1 WO9857035 A1 WO 9857035A1
Authority
WO
WIPO (PCT)
Prior art keywords
shank
slot
elongate member
rock bolt
washer
Prior art date
Application number
PCT/GB1998/001569
Other languages
French (fr)
Inventor
Arturo Benedetto Giorgio Pastorino
Original Assignee
Steeledale Group Limited
Higgins, Michael, Roger
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Steeledale Group Limited, Higgins, Michael, Roger filed Critical Steeledale Group Limited
Priority to AU76669/98A priority Critical patent/AU746675B2/en
Priority to CA002293518A priority patent/CA2293518A1/en
Publication of WO1998057035A1 publication Critical patent/WO1998057035A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/008—Anchoring or tensioning means

Definitions

  • This invention relates to a rock bolt.
  • the invention provides, in the first instance, a rock bolt shank which includes an
  • elongate member in which is formed at least one longitudinally extending slot.
  • the slot may spiral along the length of the elongate member or may extend in any
  • the slot is straight and extends substantially parallel to a longitudinal axis of the elongate member.
  • the slot may have any suitable profile in cross section.
  • the slot may for example by U- shaped.
  • the slot is substantially closed on itself with a relatively narrow slit at a surface of the elongate member and forms a substantially closed passage inside the
  • the slot in this example of the invention, may have a substantially
  • the elongate member may be threaded around at least part of the slot.
  • the slot may have a tube in it.
  • the slot may be at least partially covered or closed in any suitable way for
  • the shank may include a washer which is engaged with the elongate member and sealing
  • the washer may include a hole or an inlet device through which a settable substance such as a grout or resin may be injected.
  • the invention extends, in the second instance, to a rock bolt which includes a shank, at
  • the shank is preferably of the aforementioned kind.
  • the invention also extends to a method of forming a rock bolt shank which includes the steps of rolling at least one longitudinally extending slot in an elongate member and
  • the method may include the step of locating a tube in the slot.
  • the method may include the step of subjecting the elongate member to a rolling process
  • the slot may be
  • the method may include the steps of engaging an expanding anchor mechanism with the shank at one end of the shank and a washer and a nut with a threaded opposing end of
  • Figure 1 schematically illustrates successive stages in the formation of a profiled shank for use in a rock bolt according to the invention
  • Figure 2 is a side view of a rock bolt shank according to one form of the invention.
  • Figure 3 is a cross-sectional view of the shank of Figure 2;
  • Figure 4 is a side view of a rock bolt shank according to a different form of the
  • Figure 5 is a cross-sectional view of the shank shown in Figure 4.
  • Figure 6 is a side view of an assembled rock bolt according to the invention illustrating
  • FIG. 1 of the accompanying drawings schematically illustrates five sets of rollers 10 A, 10B, IOC, 10D and 10E, respectively and a rotatable sheave 12 which is driven through a gear mechanism by means of an electric motor, not shown.
  • An elongate member 14 of appropriate composition and cross-section e.g. round bar
  • the round bar 14 of an appropriate diameter, is fed from a coil, not shown, through the rollers and around the sheave.
  • the round bar 14 is formed from steel which can be processed, as
  • Each pair of the rollers 10A to 10E is designed to shape the round bar into a
  • the profile 14D has a slot 18
  • shaped slot is closed substantially onto itself and has a tear- drop shape 20 in cross section.
  • a relatively narrow slit 22 extends on the outer surface of the round bar along
  • the rotating sheave 12 draws the bar through the rollers in a manner which is known in the art and which consequently is not further described herein.
  • the round bar is formed continuously with the slot and thereafter is straightened and cut
  • a thread can be rolled over all or
  • Figure 2 illustrates a portion of a shank 24 of a rock bolt according to one form of the
  • Figures 4 and 5 are views similar to Figures 2 and 3 respectively and illustrate a shank 26. In this case, though use is made of a profile which is similar to the profile 14D.
  • thin walled plastic tube 28 is located in the slot along the length of the shank 26.
  • a substantially closed passage can be provided in any other way. For example once a
  • Figure 6 illustrates from the side a rock bolt 30 constructed using a shank 24 of the kind
  • the rock bolt has an expanding anchor mechanism 32 engaged with
  • a washer 34 is engaged with an opposed end of the shank and a nut 36 is threadedly engaged with thread 38 on this end of the shank.
  • the washer 34 is domed and includes an inlet aperture 40 which may, in practice, accommodate a filler valve of any appropriate kind e.g. a one-way valve.
  • An inner surface of the washer has a flexible sealing disc 42, made for example of foam rubber,
  • the rock bolt In use the rock bolt is inserted into a hole 44 formed in a rock face 46.
  • the nut 36 is tightened and the mechanism 32 is expanded into frictional contact with a wall of the hole. This is substantially in accordance with conventional techniques and provides the so-called "temporary" support. Thereafter a grout or any other suitable settable medium
  • rock bolt of the invention thus makes it possible to provide a temporary support of the kind referred to in the preamble of this specification and to make use of the same

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

A rock bolt (30) which includes a shank (24), at least one longitudinally extending slot (18) in the shank, an expanding anchor mechanism (32) at one end of the shank, a washer (34) at an opposed end of the shank, and a nut (36) which is engaged with thread (38) formed at least at the said opposed end of the shank.

Description

A ROCK BOLT
This invention relates to a rock bolt.
Mechanical rock bolts e.g. of the expanding head type are sometimes categorised as temporary supports. After these bolts have been installed to provide immediate support in an underground excavation it is quite commonplace to provide what is referred to as permanent support by fixing shepherd crooks or similar devices in place using grouting techniques or appropriate resins.
The use of the aforementioned two types of supports does provide adequate rock reinforcement but at significant additional expense attributable to the drilling of two sets of holes in the rock body and the placing of two sets of rock anchors.
SUMMARY OF THE INVENTION
The invention provides, in the first instance, a rock bolt shank which includes an
elongate member in which is formed at least one longitudinally extending slot.
The slot may spiral along the length of the elongate member or may extend in any
other appropriate way. Preferably however the slot is straight and extends substantially parallel to a longitudinal axis of the elongate member.
The slot may have any suitable profile in cross section. The slot may for example by U- shaped.
Alternatively the slot is substantially closed on itself with a relatively narrow slit at a surface of the elongate member and forms a substantially closed passage inside the
elongate member. The slot, in this example of the invention, may have a substantially
tear-drop shape in cross-section.
The elongate member may be threaded around at least part of the slot.
The slot may have a tube in it.
Alternatively the slot may be at least partially covered or closed in any suitable way for
example by making use of tape or any closing mechanism or substance in order to form
a substantially closed passage inside the elongate member.
The shank may include a washer which is engaged with the elongate member and sealing
means on an inner face of the washer to enable the washer to be brought into substantial
sealing contact with a rock face during use of the rock bolt shank.
The washer may include a hole or an inlet device through which a settable substance such as a grout or resin may be injected.
The invention extends, in the second instance, to a rock bolt which includes a shank, at
least one longitudinally extending slot in the shank, an expanding anchor mechanism at one end of the shank, a washer at an opposed end of the shank, and a nut which is
engaged with thread formed at least at the said opposed end of the shank.
The shank is preferably of the aforementioned kind.
The invention also extends to a method of forming a rock bolt shank which includes the steps of rolling at least one longitudinally extending slot in an elongate member and
forming thread on at least part of the member.
The method may include the step of locating a tube in the slot.
The method may include the step of subjecting the elongate member to a rolling process
in order to cause the slot to close substantially onto itself. In this way the slot may be
shaped to form a substantially enclosed passage inside the shank.
The method may include the steps of engaging an expanding anchor mechanism with the shank at one end of the shank and a washer and a nut with a threaded opposing end of
the shank.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is further described by way of example with reference to the accompanying drawings in which:
Figure 1 schematically illustrates successive stages in the formation of a profiled shank for use in a rock bolt according to the invention;
Figure 2 is a side view of a rock bolt shank according to one form of the invention;
Figure 3 is a cross-sectional view of the shank of Figure 2;
Figure 4 is a side view of a rock bolt shank according to a different form of the
invention;
Figure 5 is a cross-sectional view of the shank shown in Figure 4; and
Figure 6 is a side view of an assembled rock bolt according to the invention illustrating
its manner of use.
DESCRIPTION OF PREFERRED EMBODIMENT
Figure 1 of the accompanying drawings schematically illustrates five sets of rollers 10 A, 10B, IOC, 10D and 10E, respectively and a rotatable sheave 12 which is driven through a gear mechanism by means of an electric motor, not shown.
An elongate member 14 of appropriate composition and cross-section, e.g. round bar
14 of an appropriate diameter, is fed from a coil, not shown, through the rollers and around the sheave. The round bar 14 is formed from steel which can be processed, as
described hereinafter, and which possesses the necessary qualities for use as a rock bolt shank.
Each pair of the rollers 10A to 10E is designed to shape the round bar into a
predetermined cross-sectional profile. The respective profiles produced by the pairs of rollers, are shown alongside the rollers, designated 14A to 14E respectively. The rollers 10A produce a shallow longitudinally
extending slot 16 in the round bar and this slot is deepened by the rollers 10B.
Successive rollers gradually close the slot onto itself. The profile 14D has a slot 18
which is substantially U-shaped. In a final step carried out by the rollers 10E the U-
shaped slot is closed substantially onto itself and has a tear- drop shape 20 in cross section. A relatively narrow slit 22 extends on the outer surface of the round bar along
the length of the round bar at the junction of the side walls of the slot.
Apart from forming the slot to the desired shape the rollers ensure that the round bar is
deformed appropriately so that it has a substantially circular cross section.
The rotating sheave 12 draws the bar through the rollers in a manner which is known in the art and which consequently is not further described herein.
The round bar is formed continuously with the slot and thereafter is straightened and cut
into straight sections each of a predetermined length. A thread can be rolled over all or
part of each section using standard thread rolling equipment, according to requirement, to form a shank of a rock bolt.
Figure 2 illustrates a portion of a shank 24 of a rock bolt according to one form of the
invention while Figure 3 illustrates the shank in cross section. In this case use is made
of a profile which is substantially similar to the profile 14E. It is apparent that through
the rolling process a substantially closed and continuous passage 20 is formed along the length of the shank.
Figures 4 and 5 are views similar to Figures 2 and 3 respectively and illustrate a shank 26. In this case, though use is made of a profile which is similar to the profile 14D. A
thin walled plastic tube 28 is located in the slot along the length of the shank 26.
Thus in the Figure 4 embodiment a closed passage is provided along the length of the
shank by means of the tube 24 which is located in the slot 16.
A substantially closed passage can be provided in any other way. For example once a
slot has been formed along the length of the shank the mouth of the slot can be closed
by means of tape which is wrapped around the shank. Any other closing mechanism can
be employed. Another possibility is to provide a tubular sheath over the shank which encases the shank and effectively provides a closed passage inside the shank. The shank could also be closed using an adhesive or other suitable settable composition, or by
means of welding. The invention is not restricted in this way.
Once the slot has been formed and processed according to requirement thread is rolled
at least over a portion of the length of the shank. This is done using conventional thread rolling machinery.
Figure 6 illustrates from the side a rock bolt 30 constructed using a shank 24 of the kind
shown in Figure 2. The rock bolt has an expanding anchor mechanism 32 engaged with
one end of the shank. A washer 34 is engaged with an opposed end of the shank and a nut 36 is threadedly engaged with thread 38 on this end of the shank.
The washer 34 is domed and includes an inlet aperture 40 which may, in practice, accommodate a filler valve of any appropriate kind e.g. a one-way valve. An inner surface of the washer has a flexible sealing disc 42, made for example of foam rubber,
or rubber, secured to it.
In use the rock bolt is inserted into a hole 44 formed in a rock face 46. The nut 36 is tightened and the mechanism 32 is expanded into frictional contact with a wall of the hole. This is substantially in accordance with conventional techniques and provides the so-called "temporary" support. Thereafter a grout or any other suitable settable medium
is injected through the aperture 40 in the washer. The medium flows into the hole 44
filling the entire volume thereof, and comes into close contact with the shank 24 and the
opposing surface of the wall of hole 44. Air in the hole 44 is expelled through the passage 20 in the shank of the rock bolt. The sealing ring 42 prevents the settable
medium from escaping from the hole. The medium, when it sets, bonds the shank to the
wall of hole 44 and provides what is referred to as "permanent" support.
The rock bolt of the invention thus makes it possible to provide a temporary support of the kind referred to in the preamble of this specification and to make use of the same
installation assembly and to inject grout or resin or any other settable substance into the hole, occupied by the rock bolt, to provide what is referred to in the art as a permanent
support. It is therefore not necessary to make use of two sets of anchors to provide temporary and permanent supports. A substantial saving in cost in the drilling of holes and the use of steel is therefore achieved.
Another benefit results from the work hardening of the round bar 14 as it progresses through the rollers. This increases the tensile strength of the shank of the rock bolt.

Claims

1. A rock bolt shank (24) which includes an elongate member and which is
characterised in that at least one longitudinally extending slot (18) is formed in the
elongate member.
2. A shank according to claim 1 characterised in that the slot (18) extends
substantially parallel to a longitudinal axis of the elongate member (24).
3. A shank according to claim 1 or 2 characterised in that, in cross-section, the slot (18) is U-shaped.
4. A shank according to claim 1 or 2 characterised in that the slot (18) is
substantially closed on itself with a relatively narrow slit (22) at a surface of the elongate member and forms a substantially closed passage inside the elongate member.
5. A shank according to any one of claims 1 to 4 characterised in that the elongate member is threaded around at least part of the slot.
6. A shank according to any one of claims 1 to 5 which is characterised in
that it includes a tube (28) located in the slot.
7. A shank according to any one of claims 1 to 6 which is characterised in that it includes a washer (34) which is engaged with the elongate member and sealing means (42) on an inner face of the washer to enable the washer to be brought into
substantial sealing contact with a rock face (46) during use of the rock bolt shank.
8. A rock bolt (30) which includes a shank (34), an expanding anchor
mechanism (32) at one end of the shank, a washer (34) at an opposed end of the shank,
and a nut (36) which is engaged with thread (38) formed at least at the said opposed end of the shank, and which is characterised in that at least one longitudinally extending slot
(18) is formed in the shank.
9. A rock bolt according to claim 8 characterised in that the shank (24) is
according to any one of claims 1 to 7.
10. A method of forming a rock bolt shank which is characterised in that it
includes the steps of rolling at least one longitudinally extending slot (18) in an elongate member (24) and then forming thread (38) on at least part of the member.
11. A method according to claim 10 which is characterised in that it includes the step of locating a tube (28) in the slot (18).
12. A method according to claim 10 which is characterised in that it includes
the step of subjecting the elongate member (24) to a rolling process in order to cause the
slot (20) to close substantially onto itself.
13. A method according to any one of claims 10 to 12 which is characterised in that it includes the steps of engaging an expanding anchor mechanism (32) with the shank at one end of the shank and a washer (34) and a nut (36) with a threaded opposing end (38) of the shank.
AMENDED CLAIMS
[received by the International Bureau on 22 October 1998 (22.10.98) ; origina l claims 1 -13 replaced by new claims 1- 16 (3 pages ) ]
1. A rock bolt shank (24) which includes an elongate member which is formed from a bar (14) and which has at least one longitudinally extending slot (18) in the elongate member, and which is characterised in that the slot (18) is substantially sealed to form a substantially closed passage (20) inside the elongate member.
2. A shank according to claim 1 characterised in that the passage is adjacent a surface of the elongate member.
3. A shank according to claim 1 or 2 characterised in that the slot (18) is substantially sealed by forming the slot so that it is substantially closed on itself with a relatively narrow slit (22) at a surface of the elongate member.
4. A shank according to claim 1 or 2 which is characterised in that it includes closing means over a mouth of the slot which substantially seals the slot.
5. A shank according to claim 4 characterised in that the said closing means is selected from : tape wrapped around the elongate member; a tubular sheath over the elongate member, an adhesive; a settable composition; welding.
6. A shank according to any one of claims 1 to 5 characterised in that the slot (18) extends substantially parallel to a longitudinal axis of the elongate member (24).
7. A shank according to any one of claims 1, 2, 4 and 5 characterised in that, in cross section, the slot (18) is U-shaped.
8. A shank according to any one of claims 1 to 7 characterised in that the elongate member is threaded over at least a portion of the length.
9. A shank according to any one of claims 1 to 8 which is characterised in that it includes a tube (28) located in the slot.
10. A shank according to any one of claims 1 to 11 which is characterised in that it includes a washer (34) which is engaged with the elongate member and sealing means (42) on an inner face of the washer to enable the washer to be brought into substantial sealing contact with a rock face (46) during use of the rock bolt shank.
11. A rock bolt (30) which includes a shank (24), an expanding anchor mechanism (32) at one end of the shank, a washer (34) at an opposed end of the shank, a nut (36) which is engaged with thread (38) formed at least at the said opposed end of the shank, and at least one longitudinally extending slot (18) which is formed in the shank, and which is characterised in that the slot is substantially sealed to form a substantially closed passage (20) inside the elongate member.
12. A rock bolt according to claim 11 characterised in that the shank (24) is according to any one of claims 1 to 10.
13. A method of forming a rock bolt shank which includes the steps of rolling at least one longitudinally extending slot (18) in an elongate bar (24) and then forming thread (38) over at least a part of the length of the bar, and which is characterised in that it includes the step of at least substantially sealing the slot to form a substantially closed passage (20) inside the bar.
14. A method according to claim 13 which is characterised in that it includes the step of subjecting the elongate bar (24) to a rolling process in order to cause the slot (20) to close substantially onto itself.
15. A method according to claim 13 which is characterised in that it includes the step of using closing means, over a mouth of the slot, to substantially seal the slot.
16. A method according to claim 15 which is characterised in that the said closing means is selected from : tape wrapped around the elongate member; a tubular sheath over the elongate member; an adhesive; a settable composition; welding.
PCT/GB1998/001569 1997-06-12 1998-05-28 A rock bolt WO1998057035A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU76669/98A AU746675B2 (en) 1997-06-12 1998-05-28 A rock bolt
CA002293518A CA2293518A1 (en) 1997-06-12 1998-05-28 A rock bolt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA97/5190 1997-06-12
ZA975190 1997-06-12

Publications (1)

Publication Number Publication Date
WO1998057035A1 true WO1998057035A1 (en) 1998-12-17

Family

ID=25586444

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001569 WO1998057035A1 (en) 1997-06-12 1998-05-28 A rock bolt

Country Status (3)

Country Link
AU (1) AU746675B2 (en)
CA (1) CA2293518A1 (en)
WO (1) WO1998057035A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102011601A (en) * 2010-11-03 2011-04-13 河南理工大学 Rapid anchor cable gun
WO2011135597A1 (en) * 2010-04-28 2011-11-03 L.T.M. S.R.L. Lavorazione Tubi E Manicotti Reinforcing element for consolidating an excavation wall
WO2011153810A1 (en) * 2010-06-10 2011-12-15 He Manchao Constant resistance and large deformation anchor rod
CN103696791A (en) * 2014-01-16 2014-04-02 湖南科技大学 Anchoring energy-absorbing anchor rod device for controlling deep rock mass
US8714883B2 (en) 2009-03-10 2014-05-06 Sandvik Intellectual Property Ab Friction bolt
EP3159554A1 (en) 2015-10-23 2017-04-26 HILTI Aktiengesellschaft Method for fixing a spreading anchor to a substrate, in which a curable composition is inserted into the annulus around the expansion anchor
EP3189901A1 (en) 2016-01-11 2017-07-12 HILTI Aktiengesellschaft Injector for filling an annular area around an anchor bolt

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183699A (en) * 1978-05-18 1980-01-15 Donan David C Jr Washer/gasket for mine roof bolt assembly
US4247223A (en) * 1977-09-20 1981-01-27 Kubota, Ltd. Rock bolt
EP0265283A1 (en) * 1986-10-23 1988-04-27 JOE SANTA & ASSOCIATES PTY. LTD. Improved rock bolt
DE4024869A1 (en) * 1989-08-10 1991-02-14 Magyar Aluminium Hydraulic self-drilling rock anchor - consists of tube deformed along its length by involuted slot with central axial borehole for fluid
US5244314A (en) * 1991-06-27 1993-09-14 Jennmar Corporation Expansion assembly
CA2130843A1 (en) * 1993-08-30 1995-03-01 Kenneth Douglas Kynoch Rock anchor bolt

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2020195A (en) * 1994-05-24 1995-11-30 Ani Corporation Limited, The Post-grouted rock bolt

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247223A (en) * 1977-09-20 1981-01-27 Kubota, Ltd. Rock bolt
US4183699A (en) * 1978-05-18 1980-01-15 Donan David C Jr Washer/gasket for mine roof bolt assembly
EP0265283A1 (en) * 1986-10-23 1988-04-27 JOE SANTA & ASSOCIATES PTY. LTD. Improved rock bolt
DE4024869A1 (en) * 1989-08-10 1991-02-14 Magyar Aluminium Hydraulic self-drilling rock anchor - consists of tube deformed along its length by involuted slot with central axial borehole for fluid
US5244314A (en) * 1991-06-27 1993-09-14 Jennmar Corporation Expansion assembly
CA2130843A1 (en) * 1993-08-30 1995-03-01 Kenneth Douglas Kynoch Rock anchor bolt
US5688077A (en) * 1993-08-30 1997-11-18 Cape Town Iron And Steel Works (Pty) Limited Rock anchor bolt

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8714883B2 (en) 2009-03-10 2014-05-06 Sandvik Intellectual Property Ab Friction bolt
WO2011135597A1 (en) * 2010-04-28 2011-11-03 L.T.M. S.R.L. Lavorazione Tubi E Manicotti Reinforcing element for consolidating an excavation wall
WO2011153810A1 (en) * 2010-06-10 2011-12-15 He Manchao Constant resistance and large deformation anchor rod
US8974151B2 (en) 2010-06-10 2015-03-10 Manchao He Constant-resistance large-deformation anchor rod
CN102011601A (en) * 2010-11-03 2011-04-13 河南理工大学 Rapid anchor cable gun
CN103696791A (en) * 2014-01-16 2014-04-02 湖南科技大学 Anchoring energy-absorbing anchor rod device for controlling deep rock mass
CN103696791B (en) * 2014-01-16 2016-06-29 湖南科技大学 A kind of anchoring energy-absorption anchor rod device for controlling deep rock mass
EP3159554A1 (en) 2015-10-23 2017-04-26 HILTI Aktiengesellschaft Method for fixing a spreading anchor to a substrate, in which a curable composition is inserted into the annulus around the expansion anchor
WO2017067945A1 (en) 2015-10-23 2017-04-27 Hilti Aktiengesellschaft Method for fixing an expansion anchor to a substrate, in which a curable mass is introduced in the annular space around the expansion anchor
US10202999B2 (en) 2015-10-23 2019-02-12 Hilti Aktiengesellschaft Method for fixing an expansion anchor to a substrate, in which a curable mass is introduced in the annular space around the expansion anchor
EP3189901A1 (en) 2016-01-11 2017-07-12 HILTI Aktiengesellschaft Injector for filling an annular area around an anchor bolt
WO2017121706A1 (en) 2016-01-11 2017-07-20 Hilti Aktiengesellschaft Injector for filling an annular space around an anchor bolt

Also Published As

Publication number Publication date
AU7666998A (en) 1998-12-30
AU746675B2 (en) 2002-05-02
CA2293518A1 (en) 1998-12-17

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