CN113944492B - Expansion shell type yielding anchor cable and construction method thereof - Google Patents
Expansion shell type yielding anchor cable and construction method thereof Download PDFInfo
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- CN113944492B CN113944492B CN202111198440.9A CN202111198440A CN113944492B CN 113944492 B CN113944492 B CN 113944492B CN 202111198440 A CN202111198440 A CN 202111198440A CN 113944492 B CN113944492 B CN 113944492B
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- 238000010276 construction Methods 0.000 title claims abstract description 11
- 238000004873 anchoring Methods 0.000 claims abstract description 40
- 239000002184 metal Substances 0.000 claims abstract description 27
- 239000011435 rock Substances 0.000 claims abstract description 12
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 239000011230 binding agent Substances 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 239000011443 resin grout Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 230000008093 supporting effect Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007569 slipcasting Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
Classifications
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- 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
-
- 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
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- 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
- E21D21/006—Anchoring-bolts made of cables or wires
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- 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
The invention belongs to the technical field of anchoring and supporting of underground engineering such as tunnels and the like, and discloses an expansion shell type yielding anchor cable and a construction method thereof, wherein the upper end of an expansion shell anchoring piece is fixedly provided with a variable cross-section yielding anchor cable, and the lower end of the expansion shell anchoring piece is fixedly provided with an anchor; the middle part of the anchor cable body is provided with a hollow metal pipe, and the outside of the hollow metal pipe is wrapped with a high-strength conical pipe; the outside of the anchor rope body is wrapped with a variable cross-section threaded sleeve through an adhesive. The invention is mainly applied to the anchoring support of a water-rich tunnel, in particular to the anchoring support and grouting protection of a high-stress large-deformation water-rich underground engineering, and an anchoring technology integrating rapid anchoring, pressure-bearing support and grouting protection is formed by a variable-section pressure-bearing anchor cable, a shell-expanding anchoring piece, an anchorage device and a backing plate; the surrounding rock is quickly supported by the biting force formed by the expanded shell anchoring piece and the surrounding rock of the hole wall after the expanded shell anchoring piece is expanded, the deformation capacity of the anchor cable is increased by the yielding function of the variable-section yielding anchor cable, and the post grouting protection is realized by the hollow metal pipe built in the variable-section anchor cable.
Description
Technical Field
The invention belongs to the technical field of anchoring support of underground engineering such as tunnels and the like, and particularly relates to an expansion shell type yielding anchor cable and a construction method thereof.
Background
At present, in underground engineering such as tunnel, the stock is the first choice that realizes top and bottom plate and side wall stability, has advantages such as supporting effectual, extensive applicability, adaptability height, has also emerged a series of novel stock that collect quick anchor in an organic whole with permanent support such as resin slip casting stock, shell slip casting stock that rises and sectional type stock. However, the anchor bolt supporting strength is smaller than that of the anchor cable, and the anchor cable is difficult to obtain a good supporting effect along with the high-stress complex geological environment such as deep trend of tunnels, structural belts and the like, and large deformation disasters frequently occur. For this reason, in the high-stress large-deformation underground engineering, the anchor cable support is increasingly adopted, wherein the application of the small-aperture resin prestressed anchor cable with the functions of rapid support and strong support is the widest, and the typical tunnel engineering application is in the mountain-like highway tunnel, so that the (extremely) reduction of the primary support replacement rate is realized. However, the resin anchoring agent can inevitably have the phenomenon that the anchoring force (extremely) is greatly reduced in the water-rich section, so that the advantage of high anchor cable supporting force is difficult to develop; meanwhile, the deformation capacity of the anchor cable is far smaller than that of the anchor rod, and the anchor cable is extremely easy to break in the supporting process of large deformation; all of which would lead to failure of the cable support.
Therefore, as tunnel engineering gradually moves to the edge and the depth of Qinghai-Tibet plateau, the encountered engineering environment is more complex, the ground stress level is continuously increased, and the underground water is generally developed and communicated, and under the current situation, the novel anchor cable which has the anchoring force not influenced by the groundwater environment, has large deformation capacity and can realize permanent support is developed, so that the support and construction of the tunnel engineering can be greatly assisted.
Disclosure of Invention
In order to overcome the problems in the related art, the embodiment of the invention discloses an expanding shell type yielding anchor cable and a construction method thereof. The technical scheme is as follows: an expansion shell type yielding anchor cable, the expansion shell type yielding anchor cable comprising: variable cross-section yielding anchor cable, expansion shell anchoring piece and anchorage device; the upper end of the expansion shell anchoring piece is fixedly provided with a variable cross section yielding anchor cable, and the lower end of the expansion shell anchoring piece is fixedly provided with an anchor;
the variable cross-section lets presses anchor rope to include: the anchor cable comprises an anchor cable body, a hollow metal pipe, a high-strength conical pipe, a variable-section threaded sleeve and a binder; the middle part of the anchor cable body is provided with a hollow metal pipe, and the outside of the hollow metal pipe is wrapped with a high-strength conical pipe; the outside of the anchor cable body is wrapped with a variable-section threaded sleeve through an adhesive;
the expansion shell anchoring piece comprises: the device comprises a serrated outer wedge body and an inner wedge body with an inner threaded connector, wherein the inner wedge body with the inner threaded connector is clamped in the serrated outer wedge body;
the anchor comprises: wedge clamping piece, base, wherein the outside at the anchor rope body is installed to the base, and the cartridge has the toper clamping piece between base and the anchor rope body.
In one embodiment, the anchor cable body is composed of multiple layers of steel wires, an intermediate layer steel wire is arranged outside the central steel wire, and the outermost layer steel wire is wrapped outside the intermediate layer steel wire;
The diameter of the middle layer steel wire is smaller than that of the outermost layer steel wire.
In one embodiment, the central steel wire of the anchor cable body is a hollow metal tube, the diameter of the hollow metal tube is 5-10 mm, the wall thickness of the hollow metal tube is greater than 1mm, and the hollow metal tube is arranged along the whole length of the anchor cable body.
In one embodiment, the front end of the anchor cable body is provided with an anchor cable front end, and a high-strength conical tube is arranged between the middle layer steel wire and the outermost layer steel wire of the anchor cable front end to form a yielding conical end.
In one embodiment, the high-strength conical tube has an inclination angle of 15-30 degrees and a length of 20-50 mm.
In one embodiment, the variable cross-section threaded sleeve is externally arranged at the front end of the anchor cable and is fixed with the front end of the anchor cable by an adhesive.
In one embodiment, the binder is one of a resin grout, a cement paste, or an epoxy resin.
In one embodiment, the variable-section threaded sleeve is a circular section with two open ends, and is composed of a large-section and a small-section;
The diameter of the large-section is 5-20 mm larger than the maximum diameter of the yielding conical end, and the length of the large-section is set according to the yielding sliding deformation requirement;
The diameter of the small section is larger than the minimum diameter of the yielding conical end, smaller than the maximum diameter of the yielding conical end and not smaller than 50mm.
In one embodiment, the front end of the variable-section threaded sleeve is matched with the threads of the inner wedge body with the inner threaded connector and is directly connected through rotation;
The middle part of the inner wedge body with the inner threaded connector is provided with a hollow channel;
The serrated outer wedge body is of a two-petal semicircular structure, the outer wall is of a reverse serrated structure, and the inner wall is adhered to the inner wedge body;
the wedge-shaped clamping piece is provided with three petals.
The invention further aims to provide a construction method for realizing the expansion shell type yielding anchor cable, which comprises the following steps of:
s1, determining a target rock mass, and forming an anchor hole on the target rock mass;
S2, rotationally connecting the variable-section yielding anchor cable with the expansion shell anchoring piece through threads;
S3, conveying the assembled expansion shell yielding anchor cable to the bottom of a drilling hole;
s4, stretching the anchor rope body outwards to drive the inner wedge body with the inner threaded connector to move outwards of the anchor hole, so that the hole bottom expansion shell anchoring piece is expanded, and the serrated outer wedge body is meshed with the anchor hole to finish fixation;
s5, sequentially installing a backing plate and an anchorage device at the rear end of the anchor rope body;
S6, stretching the anchor cable body by using prestress stretching equipment to drive the wedge-shaped clamping piece to move outwards, placing Zhang Maosuo body, retracting the wedge-shaped clamping piece to squeeze the base, and completing prestress loading;
And S7, grouting through the external grouting joint of the hollow metal pipe after the tunnel deformation is basically completed, and discharging slurry from the end part of the inner wedge body of the internal thread joint through the hollow metal pipe to the hollow channel until the orifice overflows, so that permanent protection of the anchor cable is finally formed.
By combining all the technical schemes, the invention has the advantages and positive effects that:
(1) The invention is mainly applied to the anchoring support of a water-rich tunnel, in particular to the anchoring support and grouting protection of a high-stress large-deformation water-rich underground engineering, and an anchoring technology integrating rapid anchoring, pressure-bearing support and grouting protection is formed by a variable-section pressure-bearing anchor cable, a shell-expanding anchoring piece, an anchorage device and a backing plate; the basic principle is that the surrounding rock is quickly supported by the biting force formed by the expanded shell anchoring piece and the surrounding rock of the hole wall after the expanded shell anchoring piece is expanded, the deformation capacity of the anchor cable is increased by the yielding function of the variable-section yielding anchor cable, and the post grouting protection is realized by the hollow metal pipe built in the variable-section anchor cable.
(2) The invention realizes the rotary connection of the anchor cable body and the expansion shell anchoring piece through the threaded sleeve, and provides the expansion shell anchor cable which has a simple structure, is easy to process and is convenient to construct.
(3) Aiming at the defect of insufficient deformation capacity of the anchor cable, the constant-resistance yielding function is ensured and the deformation capacity of the anchor cable is enhanced by shearing and sliding the yielding conical end in the adhesive in the threaded sleeve; further, the adjustment of the yielding force can be realized by changing the length and the angle of the yielding conical end, the type of the adhesive, the thickness, the diameter and the like of the large-section of the sleeve, and the adjustment of the yielding force can be realized by changing the length of the large-section of the sleeve; furthermore, the threaded sleeve adopts a variable cross section mode, and the diameter of the small cross section is set to realize 'stopping' after reaching the preset yielding amount, so that the threaded sleeve can continue to bear deformation until fracture occurs.
(4) The anchor cable body adopts a multi-steel wire form, and the central steel wire is arranged into a hollow structure form, so that the reverse grouting is realized from the bottom, the post grouting effect is ensured, and the permanent protection is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic cross-sectional structure of a tension shell type yielding anchor cable according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional structure of a tension shell type compression anchor cable according to an embodiment of the present invention after compression sliding.
Fig. 3 is a side view of a variable cross-section yielding cable in a tension shell yielding cable provided in accordance with an embodiment of the present invention.
Fig. 4 is a 5-5 cross-sectional view of a tension shell type yielding cable provided by an embodiment of the present invention.
Fig. 5 is a 6-6 cross-sectional view of a tension shell type yielding cable provided in accordance with an embodiment of the present invention.
Fig. 6 is a 7-7 cross-sectional view of a tension shell type yielding cable provided in accordance with an embodiment of the present invention.
Fig. 7 is a cross-sectional view of an expanded shell type yielding anchor cable according to an embodiment of the present invention, taken along line 8-8.
Fig. 8 is a smooth tapered tube of a tension shell type yielding anchor cable provided by an embodiment of the present invention.
In the figure: 10. an anchoring agent; 11. an outer wedge; 12. an inner wedge with an inner threaded connector; 13. pressing the conical end; 14. an anchor cable body; 15. an anchor hole; 16. a backing plate; 17. a base; 18. a conical clamping piece; 19. a variable cross-section threaded sleeve; 20. a binder; 21. the front end of the anchor cable; 31. a hollow channel of the inner wedge; 32. yielding a slippage; 40. a hollow metal tube; 41. an outermost layer steel wire; 42. an intermediate layer steel wire; 45. a high-strength conical tube; 50. variable cross-section yielding anchor cable; 60. a shell expansion anchoring piece; 70. an anchor.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "left", "right" and the like are used herein for illustrative purposes only and are not meant to be the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
An expansion shell type yielding anchor cable comprising: variable cross-section yielding anchor cable 50, expansion shell anchor 60, anchorage 70, and backing plate 16; the variable cross-section yielding anchor cable 50 comprises an anchor cable body 14, a hollow metal tube 40, a high-strength conical tube 45, a variable cross-section threaded sleeve 19 and a binder 20; the expansion shell anchoring piece 60 comprises a serrated outer wedge 11 and an inner wedge 12 with an inner threaded connector; the anchorage comprises a wedge-shaped clip 18, a base 17.
Further, the anchor cable body 14 is composed of three layers of 19 steel wires, namely, one central steel wire 40, eight middle steel wires 42 and eight outermost steel wires 41, and the diameter of the middle steel wires 42 is smaller than that of the outermost steel wires 41.
Further, the central steel wire 40 of the anchor cable body is a hollow metal pipe with the diameter of 5-10 mm and the wall thickness of more than 1mm, and is arranged along the whole length of the anchor cable body.
A high-strength conical tube 45 is arranged between the middle layer steel wire 42 and the outermost layer steel wire 41 of the front end 21 of the anchor cable to form a yielding conical end 13.
The high-strength conical tube 45 has an inclination angle of 15-30 degrees and a length of 20-50 mm.
The variable-section threaded sleeve 19 is externally arranged at the front end 21 of the anchor cable, and the variable-section threaded sleeve 19 is fixed with the front end 21 of the anchor cable by using an adhesive 20.
The binder 20 may be a resin grout, cement paste or epoxy.
The variable-section threaded sleeve 19 is a circular section with two open ends and is composed of a large-section and a small-section; the diameter of the large-section is 5-20 mm larger than the maximum diameter of the yielding conical end 13, and the length is set according to the actual yielding sliding deformation requirement; the diameter of the small section is slightly larger than the minimum diameter of the yielding conical end 13, smaller than the maximum diameter of the yielding conical end 13 and not smaller than 50mm in length.
The front end of the variable-section threaded sleeve 19 is matched with the threads of the inner wedge body 12 with the internal threaded connector, and is directly connected through rotation.
The middle part of the inner wedge body 12 with the internal thread connector is provided with a hollow channel 31.
The serrated outer wedge 11 is of a two-petal semicircular structure, the outer wall is of a reverse serrated structure, and the inner wall is attached to the inner wedge 12.
The wedge-shaped clip 18 has three lobes.
An expansion shell type yielding anchor cable and a construction method thereof, wherein the installation steps comprise:
s1, determining a target rock mass, and forming an anchor hole 15 in the target rock mass;
s2, rotationally connecting the variable cross-section yielding anchor cable 50 and the expansion shell anchoring piece 60 through threads;
S3, conveying the assembled expansion shell yielding anchor cable to the bottom of a drilling hole;
s4, stretching the anchor rope body 14 outwards to drive the inner wedge body 12 with the inner threaded connector to move outwards of the anchor hole, so that the hole bottom expansion shell anchoring piece 60 is expanded, and the serrated outer wedge body 11 is meshed with the anchor hole 15 to finish fixation;
s5, sequentially installing a backing plate 16 and an anchorage device 70 at the rear end of the anchor rope body 14;
S6, stretching the anchor cable body 14 by using prestress stretching equipment to drive the wedge-shaped clamping piece 18 to move outwards, placing Zhang Maosuo the body 14, and retracting the wedge-shaped clamping piece 18 to squeeze the base 17 to finish prestress loading;
And S7, grouting is carried out by externally connecting a grouting joint through the hollow metal pipe 40 after the tunnel deformation is basically completed, grouting liquid flows from the hollow metal pipe 40 to the hollow channel 31, and the end part of the inner wedge body 12 of the internal thread joint is subjected to grouting until the orifice overflows, so that permanent protection of the anchor cable is finally formed.
The invention integrates the functions of quick anchoring construction, pressure-yielding support, grouting protection and the like, effectively solves the defects of complex construction procedures, poor support timeliness, weak support capacity and the like of the bonding anchoring form in the water-rich rock stratum, improves the capacity of the anchor cable for absorbing rock deformation on the basis, eliminates the risk of brittle failure and damage of the anchor cable due to poor deformation capacity, and is particularly suitable for quick strong support of large-deformation tunnels under high-stress water-rich environment.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure should be limited by the attached claims.
Claims (10)
1. The utility model provides a shell-type lets and presses anchor rope that rises, its characterized in that, shell-type lets presses anchor rope that rises includes: the variable cross-section yielding anchor cable (50), the expansion shell anchoring piece (60) and the anchorage device (70); the upper end of the expansion shell anchoring piece (60) is fixedly provided with a variable cross section yielding anchor cable (50), and the lower end of the expansion shell anchoring piece (60) is fixedly provided with an anchor device (70);
The variable cross-section yielding anchor cable (50) comprises: the anchor cable comprises an anchor cable body (14), a hollow metal pipe (40), a high-strength conical pipe (45), a variable-section threaded sleeve (19) and a binder (20); the middle part of the anchor cable body (14) is provided with a hollow metal pipe (40), and the outside of the hollow metal pipe (40) is wrapped with a high-strength conical pipe (45); the outside of the anchor cable body (14) is wrapped with a variable-section threaded sleeve (19) through an adhesive (20);
The expansion shell anchor (60) comprises: the device comprises a serrated outer wedge body (11) and an inner wedge body (12) with an internal thread connector, wherein the inner wedge body (12) with the internal thread connector is clamped in the serrated outer wedge body (11);
the anchor comprises: the wedge-shaped clamping piece (18) and the base (17), wherein the base (17) is arranged outside the anchor cable body (14), and the wedge-shaped clamping piece (18) is inserted between the base (17) and the anchor cable body (14).
2. The expansion shell type yielding anchor cable according to claim 1, wherein the anchor cable body (14) is composed of a plurality of layers of steel wires, an intermediate layer steel wire (42) is arranged outside the central steel wire, and an outermost layer steel wire (41) is wrapped outside the intermediate layer steel wire (42);
The diameter of the middle layer steel wire (42) is smaller than that of the outermost layer steel wire (41).
3. The expansion shell type yielding anchor cable according to claim 2, wherein the central steel wire of the anchor cable body (14) is a hollow metal tube (40), the diameter of the hollow metal tube (40) is 5-10 mm, the wall thickness of the hollow metal tube (40) is larger than 1mm, and the hollow metal tube (40) is arranged along the entire length of the anchor cable body (14).
4. The expansion shell type yielding anchor cable according to claim 2, wherein the front end of the anchor cable body (14) is provided with an anchor cable front end (21), and a high-strength conical tube (45) is arranged between an intermediate layer steel wire (42) and an outermost layer steel wire (41) of the anchor cable front end (21) to form the yielding conical end (13).
5. The expansion shell type yielding anchor cable according to claim 4, wherein the inclination angle of the high-strength conical tube (45) is 15-30 degrees and the length is 20-50 mm.
6. The expansion shell type yielding anchor cable according to claim 1, wherein the variable cross-section threaded sleeve (19) is externally arranged at the front end (21) of the anchor cable, and the variable cross-section threaded sleeve (19) is fixed with the front end (21) of the anchor cable by using an adhesive (20).
7. The tension shell type yielding anchor cable of claim 6, wherein the binder (20) is one of a resin grout, a cement paste or an epoxy resin.
8. The expansion shell type yielding anchor cable according to claim 1, wherein the variable cross-section threaded sleeve (19) is a circular cross section with two open ends, and the variable cross-section threaded sleeve (19) is composed of a large cross-section and a small cross-section;
The diameter of the large-section is 5-20 mm larger than the maximum diameter of the yielding conical end (13), and the length of the large-section is set according to the yielding sliding deformation requirement;
the diameter of the small section is larger than the minimum diameter of the yielding conical end (13), smaller than the maximum diameter of the yielding conical end (13) and not smaller than 50mm in length.
9. The expansion shell type yielding anchor cable according to claim 1, wherein the front end of the variable cross-section threaded sleeve (19) is matched with the threads of the inner wedge body (12) with the inner threaded connector and is directly connected through rotation;
the middle part of the inner wedge body (12) with the inner threaded connector is provided with a hollow channel (31);
The serrated outer wedge body (11) is of a two-petal semicircular structure, the outer wall is of a reverse serrated structure, and the inner wall is attached to the inner wedge body (12);
The wedge-shaped clamping piece (18) is provided with three petals.
10. A construction method for realizing the expansion shell type yielding anchor cable according to any one of claims 1 to 9, which is characterized by comprising the following steps:
s1, determining a target rock mass, and forming an anchor hole (15) in the target rock mass;
S2, rotationally connecting the variable-section yielding anchor cable (50) and the expansion shell anchoring piece (60) through threads;
S3, conveying the assembled expansion shell yielding anchor cable to the bottom of a drilling hole;
s4, stretching the anchor cable body (14) outwards to drive the inner wedge body (12) with the inner threaded connector to move outwards of the anchor hole, so that the hole bottom expansion shell anchoring piece (60) is expanded, and the serrated outer wedge body (11) is meshed with the anchor hole (15) to finish fixation;
s5, sequentially installing a backing plate (16) and an anchorage device (70) at the rear end of the anchor cable body (14);
S6, stretching the anchor cable body (14) by using prestress stretching equipment, driving the wedge-shaped clamping piece (18) to move outwards, placing Zhang Maosuo the anchor cable body (14), and retracting the wedge-shaped clamping piece (18) to squeeze the base (17) to finish prestress loading;
And S7, grouting is carried out through the external grouting joint of the hollow metal pipe (40) after the tunnel deformation is basically completed, the slurry flows to the hollow channel (31) through the hollow metal pipe (40), and the slurry is discharged from the end part of the inner wedge body (12) of the internal thread connector until the orifice overflows, and finally, the permanent protection of the anchor cable is formed.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111198440.9A CN113944492B (en) | 2021-10-14 | 2021-10-14 | Expansion shell type yielding anchor cable and construction method thereof |
| PCT/CN2022/113897 WO2023061044A1 (en) | 2021-10-14 | 2022-08-22 | Expansion shell yielding anchor cable and construction method thereof |
| LU502839A LU502839B1 (en) | 2021-10-14 | 2022-08-22 | Shell expansion yield stress anchor cable and construction method thereof |
| ZA2023/02146A ZA202302146B (en) | 2021-10-14 | 2023-02-21 | Shell expansion yield stress anchor cable and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111198440.9A CN113944492B (en) | 2021-10-14 | 2021-10-14 | Expansion shell type yielding anchor cable and construction method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113944492A CN113944492A (en) | 2022-01-18 |
| CN113944492B true CN113944492B (en) | 2024-05-17 |
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| CN202111198440.9A Active CN113944492B (en) | 2021-10-14 | 2021-10-14 | Expansion shell type yielding anchor cable and construction method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN113944492B (en) |
| LU (1) | LU502839B1 (en) |
| WO (1) | WO2023061044A1 (en) |
| ZA (1) | ZA202302146B (en) |
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| CN113944492B (en) * | 2021-10-14 | 2024-05-17 | 中铁隧道集团二处有限公司 | Expansion shell type yielding anchor cable and construction method thereof |
| CN114991839B (en) * | 2022-06-08 | 2024-02-20 | 福州大学 | Push pipe type deformation assembly for anchor cable and anchor rod and application method thereof |
| CN115898494B (en) * | 2022-11-24 | 2023-09-08 | 宁波大学 | High-elongation basalt fiber anti-corrosion anchor cable and supporting method thereof |
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- 2022-08-22 LU LU502839A patent/LU502839B1/en active IP Right Grant
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113944492A (en) | 2022-01-18 |
| WO2023061044A1 (en) | 2023-04-20 |
| ZA202302146B (en) | 2023-09-27 |
| LU502839B1 (en) | 2023-04-21 |
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