CN219472135U - Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time - Google Patents
Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time Download PDFInfo
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- CN219472135U CN219472135U CN202320213105.XU CN202320213105U CN219472135U CN 219472135 U CN219472135 U CN 219472135U CN 202320213105 U CN202320213105 U CN 202320213105U CN 219472135 U CN219472135 U CN 219472135U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Abstract
The utility model discloses a Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, which comprises steel strands, and a composite anchoring unit and a lock foot auxiliary unit which are respectively arranged at two ends of the steel strands; the composite anchoring unit consists of a resin anchoring section and a cement slurry anchoring section from inside to outside in sequence; the resin anchoring section is provided with large-diameter anchoring holes at part, and resin anchoring agents are filled in the holes; the cement paste anchoring section is locally provided with large-diameter anchoring holes, and cement paste anchoring agents are filled in the holes; the lock leg accessory unit is positioned on the sprayed concrete surface of the primary support arch leg and sequentially comprises a steel belt, an anchor backing plate and an anchor device from inside to outside, and locks after pretightening force is applied to the steel strand. The technical scheme of the utility model can ensure that the lock foot anchor cable has the technical effects of timely bearing, gao Maogu force and high durability, thereby effectively controlling the deformation of the arch foot of the extremely soft rock tunnel by the lock foot anchor cable.
Description
Technical Field
The utility model relates to the field of tunnel engineering, in particular to a Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time.
Background
Soft rock tunnels are usually excavated in sections by a step method and the like, deformation of the arch feet of the primary support is quite remarkable in construction, the deformation is a weak part of the whole primary support structure, and the deformation of the primary support is easy to limit and damage, so that the deformation control of the arch feet of the tunnel and the construction quality of the locking feet of the tunnel are generally considered in tunnel construction. The locking anchor cable is a newly proposed technical measure for controlling the deformation of the arch foot of the primary support of the soft rock tunnel, and compared with the locking anchor pipe (rod), the locking anchor cable adopts a single steel strand, has larger flexibility, is not limited by the space of the tunnel, can pass through a surrounding rock relaxation area, is anchored on stable surrounding rock, can exert pretightening force and plays a role in active support.
The supporting effect of the pin-locking anchor cable is closely related to the factors such as surrounding rock strength, drilling pore-forming quality, anchoring agent performance, stirring effect, design parameters of the pin-locking anchor cable and the like. The patent application No. 201720951622.1 discloses an extrusion type soft surrounding rock tunnel prestress anchor cable group supporting structure, wherein arch portion lock foot anchor cables and side wall lock foot anchor cables are anchored on an initial support to reduce surrounding rock deformation growth rate and deformation accumulation amount, detachment and replacement of an arch are avoided, cement slurry grouting anchoring is adopted in an anchoring mode, compared with resin anchoring agent anchoring, the anchoring system has good durability, long-term service of supporting members is facilitated, and the defects are that cement slurry curing needs a long time, and the pre-tightening force is difficult to be rapidly applied and supporting effect is exerted. The Chinese patent with application number 202210156184.5 discloses a tunnel foot-locking anchor cable and an initial support arch foot horizontal convergence deformation control method, wherein the tunnel foot-locking anchor cable adopts a resin anchoring agent for anchoring, and compared with cement slurry grouting anchoring, the anchoring mode has the advantages of high curing speed of the anchoring agent and capability of rapidly applying pretightening force, thereby realizing rapid bearing, and the defect of relatively poor durability is unfavorable for long-term service of support members. In addition, for the extremely soft rock tunnel, no matter what anchoring mode is adopted, the surrounding rock strength is extremely low, so that the foot locking anchor cable has the outstanding problems of low anchoring force and difficulty in applying high pretightening force.
In order to effectively control the deformation of the arch springing of the extremely soft rock tunnel, the pin locking anchor cable simultaneously meets the following 3-point technical requirements: (1) The curing rate of the anchoring agent is high, so that the pre-tightening force can be rapidly applied, and timely bearing is realized; (2) The anchoring force is high, and high pretightening force can be applied, so that strong active support is realized; (3) Meets the requirement of tunnel engineering on long-term service of an anchoring system. In this regard, it is necessary to develop a Gao Maogu force high durability tunnel lock leg anchor cable that can be carried in time to effectively control deformation of the very soft rock tunnel arch leg.
Disclosure of Invention
Aiming at the technical problems, the utility model provides the Gao Maogu-force high-durability tunnel lock pin anchor cable which can be borne in time, so that the lock pin anchor cable has the functions of bearing in time, gao Maogu force and high durability, and can effectively control the deformation of the arch pins of the tunnel with extremely soft rock.
The technical scheme adopted by the utility model is as follows:
the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time comprises steel strands, and a composite anchoring unit and a lock foot auxiliary unit which are respectively arranged at two ends of the steel strands, wherein the steel strands are arranged in boreholes in the primary support shotcrete and surrounding rock; the composite anchoring unit is positioned in an anchoring section of the steel strand in the surrounding rock and sequentially comprises a resin anchoring section and a cement slurry anchoring section from inside to outside, and the steel strand is bonded to the wall of the anchoring hole through a resin anchoring agent and a cement slurry anchoring agent respectively; the lock leg accessory unit is positioned on the sprayed concrete surface of the primary support arch leg, and locks the steel strand after applying pretightening force.
In the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, large-diameter anchor holes are formed in the corresponding positions of the resin anchor sections, resin anchoring agents are filled in the anchor holes, and the steel strands are bonded to the hole walls of the anchor holes.
In the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, large-diameter anchor holes are formed in the corresponding positions of the cement paste anchor sections, cement paste anchoring agents are filled in the anchor holes, and the steel strands are bonded to the walls of the anchor holes.
In the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, the large-diameter anchor hole is in an inverted wedge shape, the length is 15-20cm, and the diameters of the two ends are 28-32mm and 70-80mm respectively.
In the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, the diameter of the steel stranded wire is 17.8-21.8mm, and the diameter of the anchoring hole is 28-32mm when the hole is not reamed.
In the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, 1-2 large-diameter anchor holes are respectively formed in the resin anchor section and the cement anchor section.
In the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, the lock foot accessory unit sequentially comprises a steel belt, an anchor backing plate and an anchor device from inside to outside.
In the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, the steel belt is a W-shaped steel belt longitudinally arranged along the tunnel.
In the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time, the anchor is a single-hole anchor.
The construction steps of the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time are as follows:
(1) The method comprises the steps that the normal drilling operation of the lock foot anchor cable is carried out towards surrounding rock on the surface of sprayed concrete at the arch foot of the primary support of the tunnel, and the normal drilling diameter and the drilling depth meet the design requirements;
(2) The normal drilling bit on the drilling machine is disassembled, and a reaming tool is arranged on the drilling machine;
(3) Pushing a reaming tool into the bottom of a drilled hole, starting a drilling machine, and reaming an anchoring hole to form a plurality of inverted wedge-shaped large-diameter anchoring holes one by one from inside to outside;
(4) Adopting a high-pressure air pipe to clear the drilled holes;
(5) Feeding a resin anchoring agent cartridge into the bottom of the drill hole;
(6) One end of the steel strand is inserted into a drill hole, the other end of the steel strand is connected with a drilling machine, and after the drilling machine is started, the steel strand starts to rotate to stir the resin anchoring agent, so that the bonding anchoring of the steel strand and the wall of the drill hole is realized, and a resin anchoring section is formed;
(7) Injecting cement slurry anchoring agent into the drill hole to realize bonding and anchoring of the steel strand and the wall of the drill hole, so as to form a cement slurry anchoring section;
(8) The method comprises the steps of installing a foot locking accessory unit, sequentially installing a steel belt, an anchor backing plate and an anchor device from inside to outside, and connecting a plurality of scattered foot locking anchor cables by the steel belt along the longitudinal direction of a tunnel to form an integral bearing structure;
(9) And applying pretightening force to the steel strand at the exposed end of the steel strand and locking to complete the construction of the pin-locking anchor cable.
The beneficial technical effects of the utility model are as follows:
1. the foot locking anchor cable anchoring section consists of a resin anchoring section and a cement slurry anchoring section, so that the complementary advantages of the resin anchoring and the cement slurry anchoring are realized: the resin anchoring section adopts a resin anchoring agent, and the steel stranded wires are fast bonded and anchored with the anchoring holes, so that the foot locking anchor cable can fast apply pretightening force, and the aim of timely bearing and controlling the deformation of the primary support arch foot is fulfilled; the cement slurry anchoring section adopts cement slurry as an anchoring agent, so that the high durability of the anchoring system can be ensured, the requirement of tunnel engineering on long-term service of the anchoring system is met, and the problem of tunnel structure stability caused by insufficient resin anchoring force and resin anchoring failure in the later service process is avoided.
2. The resin anchoring section and the cement slurry anchoring section are provided with anchoring holes with enlarged local diameters, so that the contact area between the anchoring agent and the walls of the anchoring holes is increased, and the anchoring force of the foot-locking anchor cable is improved; in addition, the lock foot anchor cable anchoring section is provided with a plurality of reaming anchoring sections, so that the advantages of reaming anchoring can be fully exerted, and the lock foot anchor cable has high anchoring force.
In a word, adopting this technical scheme, can making lock foot anchor rope possess simultaneously can in time bear, gao Maogu force, high durable's technical effect, and then can realize lock foot anchor rope to the effective control of extremely soft rock tunnel arch foot deformation.
Drawings
Fig. 1 is a schematic diagram of a Gao Maogu force high-durability tunnel lock pin anchor cable capable of being timely carried in an embodiment of the utility model;
fig. 2 is a schematic view of a pin-locking anchor cable anchoring hole in an embodiment of the utility model;
fig. 3 is a schematic view of a resin anchoring section of a foot-locking anchor cable in an embodiment of the utility model;
fig. 4 is a schematic view of a cement paste anchoring section of a foot-locking anchor cable in an embodiment of the utility model;
FIG. 5 is a schematic view of the structure of the steel strip of the present utility model;
fig. 6 is a schematic structural view of the anchor of the present utility model.
Reference numerals: 1-steel strand; 2-spraying concrete; 3-surrounding rock; 4-large diameter anchor holes; 5-a resin anchoring agent; 6-cement slurry anchoring agent; 7-steel belt; 8-anchor backing plates; 9-an anchor; 11-a resin anchoring section; 12-cement paste anchoring section; 14-anchoring holes.
Detailed Description
The specific technical scheme of the present utility model will be described with reference to fig. 1 to 4:
a Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time comprises a steel strand 1, and a composite anchoring unit and a lock foot auxiliary unit which are respectively arranged at two ends of the steel strand 1, wherein the steel strand 1 is arranged in a drill hole in an initial shotcrete 2 and a surrounding rock 3; the auxiliary locking unit is positioned on the surface of the sprayed concrete 2 at the arch foot of the primary support and comprises a steel belt 7, an anchor backing plate 8 and an anchor 9 from inside to outside in sequence, and the steel strand 1 is locked after pretightening force is applied by the auxiliary locking unit.
The composite anchoring unit is positioned in an anchoring section of the steel strand 1 in the surrounding rock 3 and sequentially comprises a resin anchoring section 11 and a cement slurry anchoring section 12 from inside to outside, and the steel strand 1 is bonded on the wall of an anchoring hole 14 through a resin anchoring agent 5 and a cement slurry anchoring agent 6 respectively;
the diameter of the steel strand 1 is generally 17.8-21.8mm, the diameter of the anchoring hole is 28-32mm when the steel strand is not reamed, and the steel strand 1 is adhered to the inner wall of the anchoring hole 14 through an anchoring agent. And the anchor hole 14 is subjected to partial reaming to form a large-diameter anchor hole, so that the contact area of the anchoring agent and the wall of the anchor hole can be remarkably increased compared with an anchor hole without partial reaming, the anchoring force of the foot-locking anchor cable is improved, a reliable acting point is provided for the stress of the foot-locking anchor cable, and the foot-locking effect on primary support can be effectively exerted. As shown in FIG. 2, the large-diameter anchor hole 4 is in the shape of an inverted wedge, and has a length of 15-20cm and diameters of 28-32mm and 70-80mm at both ends, respectively. As shown in fig. 3 and 4, the large-diameter anchoring holes 4 are arranged at the corresponding positions of the resin anchoring sections 11 in the utility model, and the section of anchoring holes are filled with resin anchoring agents 5 to bond the steel strands to the walls of the section of anchoring holes. And the corresponding position of the cement paste anchoring section 12 is also provided with a large-diameter anchoring hole 4, the cement paste anchoring agent 6 is filled in the anchoring hole, and the steel strand is bonded on the wall of the anchoring hole.
As a preferred form, each of the foot-locking anchor cables is provided with 1 large diameter anchor hole 4 in the resin anchor section 11 and 2 large diameter anchor holes 4 in the grout anchor section 12.
In fig. 5 and 6, the steel strip 7 is a W-shaped steel strip longitudinally arranged along the tunnel, the anchorage 9 is a single-hole anchorage, and the above-mentioned foot locking accessory units are all conventional component products, which are not described herein.
The construction steps of the Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time are as follows:
(1) Carrying out normal drilling operation of the pin locking anchor cable towards surrounding rock 3 on the surface of sprayed concrete 2 of the tunnel primary support, wherein the normal drilling diameter is 30mm, and the drilling depth is 5000mm;
(2) The normal drilling bit on the drilling machine is disassembled, and a reaming tool is arranged on the drilling machine; pushing a reaming tool into the bottom of a drilled hole, starting a drilling machine, and reaming the anchoring holes 14 to form 3 large-diameter anchoring holes 4 one by one from inside to outside;
(4) Adopting a high-pressure air pipe to clear the drilled holes;
(5) Feeding a resin anchoring agent 5 cartridge into the bottom of the drill hole;
(6) One end of a steel strand 1 is inserted into a drill hole, the other end of the steel strand is connected with a drilling machine, and after the drilling machine is started, the steel strand starts to rotate to stir a resin anchoring agent 5, so that the bonding anchoring of the steel strand 1 and the wall of the drill hole is realized, and a resin anchoring section is formed;
(7) Injecting cement slurry anchoring agent 6 into the drilled hole to realize bonding and anchoring of the steel strand 1 and the wall of the drilled hole, so as to form a cement slurry anchoring section;
(8) The method comprises the steps of installing a foot locking auxiliary unit, sequentially installing a steel belt 7, an anchor backing plate 8 and an anchorage 9 from inside to outside, and connecting a plurality of scattered foot locking anchor cables by the steel belt 7 along the longitudinal direction of a tunnel to form an integral bearing structure;
(9) And (5) applying pretightening force to the steel strand at the exposed end of the steel strand 1 and locking the steel strand to finish the construction of the lock foot anchor cable.
In the technical scheme, the foot-locking anchor cable anchoring section consists of the resin anchoring section 11 and the cement slurry anchoring section 12, and construction is completed successively. The resin anchoring section 11 can be used for rapidly applying pretightening force to the anchor cable of the locking foot, so that the aim of timely bearing and controlling the deformation of the arch foot of the primary support is fulfilled; the cement paste anchoring section 12 can ensure high durability of the anchoring system, meet the requirement of tunnel engineering on long-term service of the anchoring system, and avoid the problem of tunnel structure stability caused by insufficient resin anchoring force and resin anchoring failure in the later service process.
As a further embodiment, the resin anchoring section 11 and the cement slurry anchoring section 12 are provided with anchoring holes with enlarged local diameters, so that the contact area between the anchoring agent and the walls of the anchoring holes is increased, and the anchoring force of the foot-locking anchor cable is improved; and the anchor section of the lock foot anchor cable is provided with a plurality of reaming anchor sections, so that the advantages of reaming anchor can be fully exerted, and the lock foot anchor cable has high anchor force.
In a word, the technical scheme can realize the complementary advantages of resin anchoring and cement paste anchoring, and simultaneously by means of a multi-section reaming anchoring technology, the foot-locking anchor cable can simultaneously have the technical effects of timely bearing, gao Maogu force and high durability, and further can realize the effective control of the foot-locking anchor cable on the deformation of the arch foot of the extremely soft rock tunnel.
Claims (6)
1. Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time is characterized in that: the steel strand (1) is arranged in a drill hole in the primary support shotcrete (2) and the surrounding rock (3);
the composite anchoring unit is positioned in an anchoring section of a steel strand (1) in the surrounding rock and sequentially comprises a resin anchoring section (11) and a cement slurry anchoring section (12) from inside to outside, and the steel strand (1) is adhered to the wall of an anchoring hole (14) through a resin anchoring agent (5) and a cement slurry anchoring agent (6) respectively;
the lock leg accessory unit is positioned on the sprayed concrete surface at the position of the primary support arch leg, and locks the steel strand after applying pretightening force;
the corresponding position of the resin anchoring section (11) is provided with a large-diameter anchoring hole (4), the section of anchoring hole is filled with a resin anchoring agent (5), and the steel strand is bonded to the wall of the section of anchoring hole;
the corresponding position of the cement slurry anchoring section (12) is provided with a large-diameter anchoring hole (4), cement slurry anchoring agent (6) is filled in the anchoring hole, and the steel strand is bonded on the wall of the anchoring hole;
the large-diameter anchoring hole (4) is in an inverted wedge shape, the length is 15-20cm, and the diameters of the two ends are 28-32mm and 70-80mm respectively.
2. The Gao Maogu force high-durability tunnel lock foot anchor cable capable of being borne in time according to claim 1, wherein the anchor cable is characterized in that: the diameter of the steel strand (1) is 17.8-21.8mm, and the diameter of the anchoring hole (14) is 28-32mm when the steel strand is not reamed.
3. The Gao Maogu force high-durability tunnel lock foot anchor cable capable of being borne in time according to claim 1, wherein the anchor cable is characterized in that: the resin anchoring section and the cement anchoring section are respectively provided with 1-2 large-diameter anchoring holes (4).
4. The Gao Maogu force high-durability tunnel lock foot anchor cable capable of being borne in time according to claim 1, wherein the anchor cable is characterized in that: the foot locking accessory unit sequentially comprises a steel belt (7), an anchor backing plate (8) and an anchor (9) from inside to outside.
5. The Gao Maogu force high durability tunnel lock foot anchor cable capable of being carried in time as claimed in claim 4, wherein: the steel belt (7) is a W-shaped steel belt longitudinally arranged along the tunnel.
6. The Gao Maogu force high durability tunnel lock foot anchor cable capable of being carried in time as claimed in claim 4, wherein: the anchorage device (9) is a single-hole anchorage device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320213105.XU CN219472135U (en) | 2023-02-15 | 2023-02-15 | Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320213105.XU CN219472135U (en) | 2023-02-15 | 2023-02-15 | Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time |
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| CN219472135U true CN219472135U (en) | 2023-08-04 |
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| CN202320213105.XU Active CN219472135U (en) | 2023-02-15 | 2023-02-15 | Gao Maogu-force high-durability tunnel lock foot anchor cable capable of being borne in time |
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