CN113944492A - 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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- CN113944492A CN113944492A CN202111198440.9A CN202111198440A CN113944492A CN 113944492 A CN113944492 A CN 113944492A CN 202111198440 A CN202111198440 A CN 202111198440A CN 113944492 A CN113944492 A CN 113944492A
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- 238000010276 construction Methods 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 30
- 238000004873 anchoring Methods 0.000 claims abstract description 29
- 239000000853 adhesive Substances 0.000 claims abstract description 12
- 230000001070 adhesive effect Effects 0.000 claims abstract description 12
- 239000011435 rock Substances 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 32
- 239000010959 steel Substances 0.000 claims description 32
- 239000011440 grout Substances 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 2
- 239000003822 epoxy resin Substances 0.000 claims description 2
- 229920000647 polyepoxide Polymers 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000000630 rising effect Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011443 resin grout Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation 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
- 238000007569 slipcasting Methods 0.000 description 1
- 238000010618 wire wrap Methods 0.000 description 1
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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
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- 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
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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
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
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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
- E21D21/0026—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 support of underground engineering such as tunnels and the like, and discloses a shell-expanding yielding anchor cable and a construction method thereof, wherein the upper end of a shell-expanding anchoring part is fixedly provided with a variable-section yielding anchor cable, and the lower end of the shell-expanding anchoring part is fixedly provided with an anchorage device; a hollow metal pipe is arranged in the middle of the anchor cable body, and a high-strength conical pipe wraps the outside of the hollow metal pipe; the outer side of the anchor cable body is wrapped with a variable cross-section threaded sleeve through an adhesive. The variable cross-section yielding anchor cable, the rising shell anchor part, the anchor and the base plate form an anchoring technology integrating rapid anchoring, yielding support and grouting protection; surrounding rocks are quickly supported by the occlusion force formed by the expanded shell anchoring piece and the surrounding rocks on the wall of the cave after the expansion shell anchoring piece is expanded, the deformation capacity of the anchor rope is increased by the yielding function of the variable-section yielding anchor rope, and post-grouting protection is realized by the hollow metal pipe arranged in the variable-section anchor rope.
Description
Technical Field
The invention belongs to the technical field of anchoring and supporting 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 works such as tunnels, the stock is the first choice that realizes that roof-bottom board and side wall are stable, has advantages such as strut effectual, extensive applicability, adaptability height, has also emerged a series of novel stocks of quick anchor of collection and permanent support in an organic whole such as resin slip casting stock, shell grouting stock and sectional type stock. However, the support strength of the anchor rod is smaller than that of the anchor cable, and along with the gradual trend of the tunnel towards high-stress complex geological environments such as deep ground, structural belts and the like, a better support effect is difficult to obtain, and large deformation disasters are frequent. Therefore, anchor cable support is increasingly adopted in high-stress large-deformation underground engineering, wherein the application of the small-bore resin prestressed anchor cable with quick and strong support is the widest, and the typical tunnel engineering application is in highway tunnels of Khatsuki mountains, so that the (extremely) great reduction of the primary support replacement rate is realized. However, the resin anchoring agent inevitably has a phenomenon of greatly reducing the anchoring force in a water-rich section, so that the advantage of high anchor cable supporting force is difficult to be exerted; meanwhile, the deformation capability of the anchor cable is far smaller than that of the anchor rod, and the anchor cable is easy to break in the large-deformation supporting process; which all would result in failure of the cable bolt support.
Therefore, along with the gradual trend of tunnel engineering towards the edge and the longitudinal depth of the Qinghai-Tibet plateau, the engineering environment met is more complicated, the ground stress level continuously increases, and under the current situation of the universal development and communication of underground water, the novel anchor cable which is not influenced by the underground water environment, has large deformation capacity and can realize permanent support is researched and developed to greatly assist the support and construction of the tunnel engineering.
Disclosure of Invention
In order to overcome the problems in the related art, the disclosed embodiment of the invention provides an expanding-shell type yielding anchor cable and a construction method thereof. The technical scheme is as follows: an expanding shell type yielding anchor cable, comprising: the variable cross-section yielding anchor cable, the expansion shell anchoring part and the anchorage device; the upper end of the shell expansion anchoring part is fixedly provided with a variable-section yielding anchor cable, and the lower end of the shell expansion anchoring part is fixedly provided with an anchorage device;
the variable cross section lets presses the anchor rope and includes: the anchor cable comprises an anchor cable body, a hollow metal pipe, a high-strength conical pipe, a variable cross-section threaded sleeve and an adhesive; a hollow metal pipe is arranged in the middle of the anchor cable body, and a high-strength conical pipe wraps the outside of the hollow metal pipe; the outer side of the anchor cable body is wrapped with a variable cross-section threaded sleeve through an adhesive;
the expanding shell anchor comprises: the inner wedge body with the internal thread connector is clamped in the sawtooth-shaped outer wedge body;
the anchor comprises: the anchor cable comprises a wedge-shaped clamping piece and a base, wherein the base is installed outside the anchor cable body, and the conical clamping piece is inserted between the base and the anchor cable body.
In one embodiment, the anchor cable body is composed of a plurality of layers of steel wires, an intermediate layer steel wire is arranged outside the right center steel wire, and the outermost layer steel wire wraps the outer side of 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 steel wire at the center of the anchor cable body is a hollow metal tube, the diameter of the hollow metal tube is 5 mm-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 pipe 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 the variable cross-section threaded sleeve is fixed with the front end of the anchor cable by using an adhesive.
In one embodiment, the binder is one of resin grout, cement paste, or epoxy resin.
In one embodiment, the variable cross-section threaded sleeve is a circular cross section with openings at two ends, and the variable cross-section threaded sleeve 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 requirement of yielding sliding deformation;
the diameter of the small section is larger than the minimum diameter of the yielding conical end and smaller than the maximum diameter of the yielding conical end, and the length of the small section is not smaller than 50 mm.
In one embodiment, the front end of the variable cross-section threaded sleeve is matched with the thread of the inner wedge body with the internal threaded connector and is directly connected through rotation;
the middle part of the inner wedge-shaped body with the internal thread connector is provided with a hollow channel;
the outer wedge-shaped body of the sawtooth shape is of a two-petal semicircular structure, the outer wall of the sawtooth-shaped outer wedge-shaped body is of a reverse sawtooth structure, and the inner wall of the sawtooth-shaped outer wedge-shaped body is attached to the inner wedge-shaped body;
the wedge-shaped clamping piece has three petals.
The invention also aims to provide a construction method for realizing the shell-expanding yielding anchor cable, which comprises the following steps:
s1, determining a target rock mass, and arranging an anchor hole on the target rock mass;
s2, rotationally connecting the variable cross-section yielding anchor cable with the shell expansion anchoring piece through threads;
s3, sending the assembled expanding shell yielding anchor cable to the bottom of the drilled hole;
s4, stretching the anchor cable body outwards to drive the inner wedge-shaped body with the internal threaded connector to move outwards of the anchor hole, so that the anchor part of the hole bottom expansion shell expands, and the sawtooth-shaped outer wedge-shaped body engages with the anchor hole to finish fixing;
s5, sequentially mounting a backing plate and an anchorage device at the rear end of the anchor cable body;
s6, stretching the anchor cable body by using pre-stress stretching equipment, driving the wedge-shaped clamping piece to move outwards, releasing and stretching the anchor cable body, retracting and extruding the base by the wedge-shaped clamping piece, and completing pre-stress loading;
and S7, after the deformation of the tunnel is basically completed, grouting is carried out through a grouting joint connected outside the hollow metal pipe, the grout flows to the hollow channel through the hollow metal pipe, and the grout flows out from the end part of the inner wedge body of the inner threaded joint until the grout overflows from the orifice, so that the 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 variable cross-section yielding anchor cable, the rising shell anchor part, the anchor and the base plate form an anchoring technology integrating rapid anchoring, yielding support and grouting protection; the basic principle of the method is that surrounding rock is quickly supported through the occlusion force formed by the expanded shell anchoring piece and the surrounding rock on the wall of the hole after the expansion shell anchoring piece is expanded, the deformation capacity of the anchor rope is improved through the yielding function of the variable cross-section yielding anchor rope, and post-grouting protection is realized through a hollow metal pipe arranged in the variable cross-section anchor rope.
(2) The invention realizes the rotary connection of the anchor cable body and the expansion shell anchoring part through the threaded sleeve, and provides the expansion shell type anchor cable which has simple structure, is easy to process and is convenient to construct.
(3) Aiming at the defect of insufficient deformation capability of the anchor cable, the constant-resistance yielding function is ensured and the deformation capability of the anchor cable is enhanced by shearing and sliding the yielding conical end in the adhesive in the threaded sleeve; furthermore, the pressure can be adjusted by changing the length and angle of the yielding conical end, the type of the adhesive, the thickness and diameter of the large section of the sleeve and the like, and the yielding amount can be adjusted by changing the length of the large section of the sleeve; furthermore, the threaded sleeve adopts a variable cross-section form, and the diameter of the small cross-section is set, so that the purpose of 'stopping yielding' after the preset yielding amount is reached is realized, and the threaded sleeve continues to bear and deform until the threaded sleeve breaks.
(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 reverse grouting from the bottom is realized, the post-grouting effect is ensured, and 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.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic cross-sectional structure view of an expanding-shell type yielding anchor cable provided in an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional structure diagram of the expanding-shell type yielding anchor cable after yielding and sliding.
Fig. 3 is a side view of a cross-section yielding anchor cable in the expanding-shell type yielding anchor cable provided by the embodiment of the invention.
Fig. 4 is a cross-sectional view of 5-5 of an expanding-shell type crush cable bolt provided by an embodiment of the present invention.
Fig. 5 is a 6-6 cross-sectional view of an expanding-shell type crush cable bolt provided by an embodiment of the present invention.
Fig. 6 is a cross-sectional view of 7-7 of an expanding-shell type crush cable bolt provided by an embodiment of the present invention.
Fig. 7 is a cross-sectional view of an 8-8 expanding-shell type crush cable bolt provided by an embodiment of the present invention.
Fig. 8 is a smooth tapered tube of an expanding-shell type yielding anchor cable provided by an embodiment of the invention.
In the figure: 10. an anchoring agent; 11. an outer wedge; 12. an inner wedge with an internal threaded connector; 13. yielding the conical end; 14. an anchor cable body; 15. an anchor eye; 16. a base plate; 17. a base; 18. a tapered clip; 19. a variable cross-section threaded bushing; 20. a binder; 21. the front end of the anchor cable; 31. a hollow channel of the inner wedge; 32. yielding slippage; 40. a hollow metal tube; 41. an outermost layer of steel wire; 42. a middle layer steel wire; 45. a high-strength tapered tube; 50. the variable cross section lets the anchor rope press; 60. an expansion shell anchoring part; 70. an anchorage device.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured 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. As used herein, the terms "vertical," "horizontal," "left," "right," and the like are for purposes of illustration only and are not intended to represent 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. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
An expanding casing type yielding anchor cable comprises: the variable cross-section yielding anchor cable 50, the shell expansion anchoring part 60, the anchorage device 70 and the backing plate 16; the variable cross-section yielding anchor cable 50 comprises an anchor cable body 14, a hollow metal pipe 40, a high-strength tapered pipe 45, a variable cross-section threaded sleeve 19 and an adhesive 20; the shell expansion anchoring part 60 comprises a sawtooth-shaped outer wedge-shaped body 11 and an inner wedge-shaped body 12 with an internal threaded connector; the anchor comprises a wedge-shaped clamping piece 18 and a base 17.
Further, the anchor rope body 14 is composed of three layers of 19 steel wires, wherein the center steel wire 40, the middle layer steel wires 42 and the outermost layer steel wires 41 are arranged, and the diameter of the middle layer steel wires 42 is smaller than that of the outermost layer steel wires 41.
Further, the right center steel wire 40 of the anchor cable body is a hollow metal pipe, the diameter of the hollow metal pipe is 5-10 mm, the wall thickness of the hollow metal pipe is larger than 1mm, and the hollow metal pipe is arranged along the whole length of the anchor cable body.
A high-strength tapered pipe 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, so that a yielding tapered end 13 is formed.
The inclination angle of the high-strength conical tube 45 is 15-30 degrees, and the length is 20-50 mm.
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 and the front end 21 of the anchor cable are fixed through an adhesive 20.
The adhesive 20 may be resin grout, grout or epoxy.
The variable cross-section threaded sleeve 19 is a circular cross section with openings at two ends and consists 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 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 and smaller than the maximum diameter of the yielding conical end 13, and the length of the small section is not smaller than 50 mm.
The front end of the variable cross-section threaded sleeve 19 is matched with the thread of the inner wedge-shaped body 12 with the internal threaded connector and is directly connected through rotation.
The middle part of the inner wedge-shaped body 12 with the internal thread connector is provided with a hollow channel 31.
The outer wedge-shaped body 11 of the sawtooth shape is of a two-petal semicircular structure, the outer wall of the sawtooth-shaped outer wedge-shaped body is of a reverse sawtooth structure, and the inner wall of the sawtooth-shaped outer wedge-shaped body is attached to the inner wedge-shaped body 12.
The wedge-shaped jaw 18 has three lobes.
An expansion shell type yielding anchor cable and a construction method thereof are disclosed, wherein the installation step comprises the following steps:
s1, determining a target rock mass, and arranging an anchor hole 15 on the target rock mass;
s2, rotationally connecting the variable cross-section yielding anchor cable 50 with the shell expanding anchor member 60 through threads;
s3, sending the assembled expanding shell yielding anchor cable to the bottom of the drilled hole;
s4, stretching the anchor cable body 14 outwards to drive the inner wedge body 12 with the internal threaded connector to move outwards of the anchor hole, so that the anchor 60 of the hole bottom expansion shell is expanded, and the sawtooth-shaped outer wedge body 11 is meshed with the anchor hole 15 to complete fixing;
s5, sequentially mounting 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 pre-stress stretching equipment, driving the wedge-shaped clamping piece 18 to move outwards, stretching the anchor cable body 14, retracting the wedge-shaped clamping piece 18 to extrude the base 17, and completing pre-stress loading;
and S7, after the tunnel deformation is basically completed, grouting is carried out through the hollow metal pipe 40 and the external grouting joint, the grout flows from the hollow metal pipe 40 to the hollow channel 31, and the grout flows out from the end part of the inner wedge-shaped body 12 of the internal threaded joint until the grout overflows from the orifice, and finally the permanent protection of the anchor cable is formed.
The invention integrates the functions of quick anchoring construction, yielding support, grouting protection and the like, effectively overcomes the defects of complex construction process, poor support timeliness, weak support capability and the like of a bonding anchoring form in a water-rich rock stratum, improves the capability of the anchor cable for absorbing rock mass deformation on the basis, eliminates the risk of brittle fracture damage of the anchor cable due to poor deformation capability, and is particularly suitable for quick strong support of a large-deformation tunnel in a 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 variations, 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 will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited only by the attached claims.
Claims (10)
1. A shell-expanding type yielding anchor cable is characterized by comprising: the variable cross-section yielding anchor cable (50), the shell expansion anchoring part (60) and the anchorage device (70); the upper end of the shell expansion anchoring piece (60) is fixedly provided with a variable cross-section yielding anchor cable (50), and the lower end of the shell expansion anchoring piece (60) is fixedly provided with an anchorage 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 cross-section threaded sleeve (19) and an adhesive (20); a hollow metal pipe (40) is arranged in the middle of the anchor cable body (14), and a high-strength conical pipe (45) wraps the outside of the hollow metal pipe (40); the outer side of the anchor cable body (14) is wrapped with a variable cross-section threaded sleeve (19) through an adhesive (20);
the expanding shell anchor (60) comprises: the wedge-shaped structure comprises a sawtooth-shaped outer wedge-shaped body (11) and an inner wedge-shaped body (12) with an internal threaded connector, wherein the inner wedge-shaped body (12) with the internal threaded connector is clamped in the sawtooth-shaped outer wedge-shaped body (11);
the anchor comprises: the anchor cable comprises a wedge-shaped clamping piece (18) and a base (17), wherein the base (17) is installed outside the anchor cable body (14), and the conical clamping piece (18) is inserted between the base (17) and the anchor cable body (14).
2. The expanding-shell type yielding anchor cable as claimed in 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 a center steel wire, and the 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 expanding-shell type yielding anchor cable according to claim 2, wherein the steel wire at the center of the anchor cable body (14) is a hollow metal tube (40), the diameter of the hollow metal tube (40) is 5 mm-10 mm, the wall thickness of the hollow metal tube (40) is greater than 1mm, and the hollow metal tube (40) is arranged along the length of the anchor cable body (14).
4. The expanding-shell type yielding anchor cable as claimed in 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 the middle layer steel wire (42) and the outermost layer steel wire (41) of the anchor cable front end (21) to form a yielding conical end (13).
5. The expanding-shell type yielding anchor cable as claimed in claim 4, wherein the high-strength conical tube (45) has an inclination angle of 15-30 degrees and a length of 20-50 mm.
6. The expanding-shell type yielding cable bolt as claimed in claim 1, wherein the variable cross-section threaded sleeve (19) is externally arranged at the front end (21) of the cable bolt, and the variable cross-section threaded sleeve (19) is fixed with the front end (21) of the cable bolt by using an adhesive (20).
7. The expanding-shell type yield anchor cable according to claim 6, wherein the binder (20) is one of resin grouting, cement grout or epoxy resin.
8. The expanding-shell type yielding anchor cable as claimed in claim 1, wherein the variable-section threaded sleeve (19) is of a circular section with openings at two ends, and the variable-section threaded sleeve (19) 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 of the large section is set according to the requirement of yielding sliding deformation;
the diameter of the small section is larger than the minimum diameter of the yielding conical end (13) and smaller than the maximum diameter of the yielding conical end (13), and the length of the small section is not smaller than 50 mm.
9. The expanding-shell type yielding anchor cable as claimed in claim 1, wherein the front end of the variable cross-section threaded sleeve (19) is matched with the thread of the inner wedge-shaped body (12) with the internal threaded connector and is directly connected by rotation;
the middle part of the inner wedge-shaped body (12) with the internal threaded connector is provided with a hollow channel (31);
the outer sawtooth wedge-shaped body (11) is of a two-petal semicircular structure, the outer wall of the outer sawtooth-shaped body is of a reverse sawtooth structure, and the inner wall of the outer sawtooth-shaped body is attached to the inner wedge-shaped body (12);
the wedge-shaped clamping piece (18) has three petals.
10. A construction method for realizing the expanding-shell type yielding anchor cable as claimed in any one of claims 1 to 9, wherein the construction method for the expanding-shell type yielding anchor cable comprises the following steps:
s1, determining a target rock mass, and arranging an anchor hole (15) in the target rock mass;
s2, rotationally connecting the variable cross-section yielding anchor cable (50) with the shell expanding anchor (60) through threads;
s3, sending the assembled expanding shell yielding anchor cable to the bottom of the drilled hole;
s4, stretching the anchor cable body (14) outwards to drive the inner wedge-shaped body (12) with the inner threaded connector to move outwards of the anchor hole, so that the hole bottom expanding shell anchoring part (60) expands, and the serrated outer wedge-shaped body (11) engages with the anchor hole (15) to finish fixing;
s5, sequentially mounting a base 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 pre-stress stretching equipment, driving the wedge-shaped clamping piece (18) to move outwards, releasing and stretching the anchor cable body (14), retracting the wedge-shaped clamping piece (18) to extrude the base (17), and completing pre-stress loading;
s7, after the tunnel deformation is basically completed, grouting is carried out through a grouting joint externally connected with the hollow metal pipe (40), the grout flows to the hollow channel (31) through the hollow metal pipe (40), and the grout flows out from the end part of the inner wedge body (12) of the inner threaded connector until the grout overflows from the orifice, and finally permanent protection for 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 |
| LU502839A LU502839B1 (en) | 2021-10-14 | 2022-08-22 | Shell expansion yield stress 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 |
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113944492A true CN113944492A (en) | 2022-01-18 |
| CN113944492B CN113944492B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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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 |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN113944492B (en) |
| LU (1) | LU502839B1 (en) |
| WO (1) | WO2023061044A1 (en) |
| ZA (1) | ZA202302146B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114991839A (en) * | 2022-06-08 | 2022-09-02 | 福州大学 | Pipe jacking type deformation assembly for anchor cable and anchor rod and application method thereof |
| CN115898494A (en) * | 2022-11-24 | 2023-04-04 | 宁波大学 | High-elongation basalt fiber anti-corrosion anchor cable and supporting method thereof |
| WO2023061044A1 (en) * | 2021-10-14 | 2023-04-20 | 中铁隧道集团二处有限公司 | Expansion shell yielding anchor cable and construction method thereof |
| CN116181384A (en) * | 2023-03-28 | 2023-05-30 | 成都理工大学 | Quick hybrid anchoring pre-stressed anchor cable and construction method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116988825B (en) * | 2023-09-25 | 2023-12-05 | 中国矿业大学(北京) | Resistance-increasing large-deformation grouting anchor rod and application method |
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| CN114991839A (en) * | 2022-06-08 | 2022-09-02 | 福州大学 | Pipe jacking type deformation assembly for anchor cable and anchor rod and application 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 |
| CN115898494A (en) * | 2022-11-24 | 2023-04-04 | 宁波大学 | High-elongation basalt fiber anti-corrosion anchor cable and supporting method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113944492B (en) | 2024-05-17 |
| LU502839B1 (en) | 2023-04-21 |
| ZA202302146B (en) | 2023-09-27 |
| WO2023061044A1 (en) | 2023-04-20 |
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