CN218882271U - A lock foot anchor rope for broken country rock tunnel - Google Patents
A lock foot anchor rope for broken country rock tunnel Download PDFInfo
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- CN218882271U CN218882271U CN202223355127.4U CN202223355127U CN218882271U CN 218882271 U CN218882271 U CN 218882271U CN 202223355127 U CN202223355127 U CN 202223355127U CN 218882271 U CN218882271 U CN 218882271U
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- anchor rope
- surrounding rock
- steel pipe
- steel strand
- hole
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Abstract
The utility model discloses a lock foot anchor rope for a broken surrounding rock tunnel, which comprises a steel strand, a retaining wall steel pipe and a lock foot auxiliary unit, wherein the surface of the surrounding rock is provided with a preliminary support, and the inside of the surrounding rock is provided with a first drilling hole and a second drilling hole which are coaxial; inserting the wall protection steel pipe into the primary support sprayed concrete and a first drill hole in the surrounding rock, wherein the end part of the wall protection steel pipe is flush with the surface of the primary support sprayed concrete; one end of the steel strand penetrates through the retaining wall steel pipe and then goes deep into the surrounding rock, the steel strand is bonded in a second drilled hole in the surrounding rock through a resin anchoring agent, and the locking foot auxiliary unit is provided with a primary support sprayed concrete surface to apply pre-tightening force to the exposed end of the steel strand and lock the steel strand. The utility model discloses the hole that easily collapses, the difficult scheduling problem of resin anchoring agent installation that exist when can solving broken country rock tunnel lock foot anchor rope construction ensure the smooth installation of tunnel lock foot anchor rope.
Description
Technical Field
The utility model relates to a tunnel engineering field, concretely relates to lock foot anchor rope for broken country rock tunnel.
Background
The displacement of the primary support arch springing in the soft surrounding rock tunnel subsection excavation construction is often remarkable, the displacement is a weak part of the whole primary support structure, the deformation, the limit invasion and the damage of the primary support are easily caused, and tunnel collapse can also occur in the case of serious conditions. The foot locking anchor cable is a newly proposed technical measure for controlling the deformation of the primary support arch springing, and particularly can play a good role in controlling the horizontal convergence deformation of the arch springing. The support function of the lock leg anchor cable is closely related to various factors such as the strength of surrounding rock, the drilling and pore-forming quality, the performance of an anchoring agent, the stirring effect, the design parameters of the lock leg anchor cable and the like.
The Chinese patent with the application number of 201720951622.1, an extrusion type weak surrounding rock tunnel prestressed anchor cable group supporting structure, discloses an extrusion type weak surrounding rock tunnel prestressed anchor cable group supporting structure, wherein a leg locking anchor cable is adopted, an arch leg locking anchor cable and a side wall leg locking anchor cable are anchored on primary support to reduce the deformation growth rate and deformation accumulation of surrounding rock and avoid the arch replacement caused by excessive deformation, the specific anchoring mode is grouting anchoring, due to the time required for solidification of anchoring grout (cement mortar), the anchor cable is tensioned to apply prestress when the strength of the mortar reaches more than 70%, and the initial tension is only 40-50% of the total tension, so that quick anchoring and supporting are difficult to realize. Compared with grouting anchoring, resin anchoring agent anchoring has the characteristic of quick anchoring, anchoring of the anchor cable can be realized after the resin anchoring agent is stirred for tens of seconds, and further, quick application of prestress can be carried out, so that the method plays an important role in early stabilization of surrounding rocks. However, the resin anchoring agent cartridge is soft before stirring and curing, so that the problem that the resin anchoring agent is difficult to install due to the fact that drilling holes collapse and block during construction of the leg locking anchor cable of the broken surrounding rock tunnel generally exists, and construction of the leg locking anchor cable is difficult. These problems have become bottlenecks that limit the application and popularization of resin anchored leg-lock cable support technology. When the primary support arch springing is deformed, invades the limit and is damaged, emergency treatment measures such as temporary support, surrounding rock grouting reinforcement and arch replacement are often forced to be taken, and construction progress, safety and quality are seriously influenced.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the utility model provides a lock foot anchor rope for broken country rock tunnel to the drilling that exists when solving broken country rock tunnel lock foot anchor rope construction easily collapses hole jam, resin anchoring agent installation difficulty scheduling problem, ensures the smooth installation of tunnel lock foot anchor rope.
The utility model adopts the technical scheme as follows:
a foot locking anchor cable for a broken surrounding rock tunnel comprises a steel strand, a wall protecting steel pipe and foot locking auxiliary units, wherein an initial support is arranged on the surface of the surrounding rock, and a first drilling hole and a second drilling hole which are coaxial are arranged in the surrounding rock; inserting the wall protection steel pipe into a first drill hole in the primary support sprayed concrete and the surrounding rock, wherein the end part of the wall protection steel pipe is flush with the surface of the sprayed concrete; one end of the steel strand penetrates through the retaining wall steel pipe and then goes deep into the surrounding rock, and is anchored in a second drilling hole in the surrounding rock through a resin anchoring agent, and the locking pin auxiliary unit is arranged on the surface of primary support sprayed concrete and applies pretightening force to the exposed end of the steel strand and locks the steel strand.
In the foot-locking anchor cable for the broken surrounding rock tunnel, the length of the steel strand anchoring section is 1-1.5m.
In the foot locking anchor cable for the broken surrounding rock tunnel, the diameter of the first drill hole is 42-65mm, and the diameter of the second drill hole is 24-32mm.
In the foot locking anchor cable for the broken surrounding rock tunnel, the length of the wall protection steel pipe is 3-8m, the outer diameter is 42-60mm, and the wall thickness is 3.5-4.5 mm.
In the foot locking anchor cable for the broken surrounding rock tunnel, the diameter of the steel strand is 15-22mm.
In the foot-locking anchor cable for the broken surrounding rock tunnel, the foot-locking auxiliary unit sequentially comprises a steel belt, an anchor backing plate and an anchor from inside to outside.
In the foot-locking anchor cable for the broken surrounding rock tunnel, the steel belt is provided with the strip hole for the steel strand to pass through.
In the foot locking anchor cable for the broken surrounding rock tunnel, the anchor is a single-hole anchor.
The utility model has the advantages of as follows:
1. adopt the technical scheme of the utility model, through the effect of strutting of performance dado steel pipe to lock foot anchor rope drilling pore wall, avoid broken country rock tunnel lock foot anchor rope drilling to take place to collapse the hole and block up, ensure that resin anchoring agent can reach the anchor section position of locating through drilling smoothly, drilling that exists when having solved broken country rock tunnel lock foot anchor rope construction is easily collapsed hole jam, resin anchoring agent installation difficulty problem. The technical scheme enables the leg-locking anchor cable to realize successful anchoring, and plays a role in determining the anchoring effect of the leg-locking anchor cable.
2. The utility model discloses the dado steel pipe that adopts among the technical scheme can compensate lock foot anchor rope bending stiffness not enough, makes lock foot anchor rope not only possess axial tensile strength, still possesses certain horizontal bending resistance simultaneously to more be favorable to the control to encircleing the vertical settlement deformation of foot.
Drawings
Fig. 1 is a schematic view of a mounting structure of a lock pin anchor cable in an embodiment of the present invention;
FIG. 2 is a schematic view of the positions of a first borehole and a second borehole in a surrounding rock;
FIG. 3 is a schematic view of a steel strip arranged along the longitudinal direction of a tunnel according to an embodiment of the present invention;
FIG. 4 is a schematic view of an anchor pad according to an embodiment of the present invention;
FIG. 5 is a schematic view of an anchor according to an embodiment of the present invention;
reference numerals: 1-a wall protecting steel pipe; 2-a resin anchoring agent; 3-steel strand wires; 4-a steel belt; 5-anchor backing plate; 6-an anchorage device; 7-primary support; 8-surrounding rock; 9-a first bore; 10-second bore.
Detailed Description
As shown in fig. 1 and fig. 2, the utility model discloses use broken country rock tunnel lock foot anchor rope construction as an example, introduce the specific technical scheme of the utility model:
the utility model discloses a lock foot anchor rope for broken country rock tunnel, including steel strand wires 3, dado steel pipe 1 and lock foot subsidiary unit, the surface of country rock 8 is provided with preliminary bracing 7 shotcrete, and the inside of country rock 8 is provided with the first drilling 9 and the second drilling 10 of coaxial line; the wall protecting steel pipe 1 is inserted into a first drilling hole 9 in the primary support 7 sprayed concrete and surrounding rocks 8, and the end part of the wall protecting steel pipe 1 is flush with the surface of the primary support 7 sprayed concrete; one end of the steel strand 3 penetrates through the retaining wall steel pipe 1 and then extends into the surrounding rock 8, and is anchored in a second drilled hole 10 in the surrounding rock 8 through a resin anchoring agent 2, and the locking pin auxiliary unit is arranged on the surface of sprayed concrete of the primary support 7, applies pretightening force to the exposed end of the steel strand 3 and locks the exposed end.
The diameter of the first drilling hole 9 is 42-65mm, the diameter of the second drilling hole 10 is 24-32mm, and the length of a bonding section, namely an anchoring section of the steel strand 3 in the surrounding rock is 1-1.5m. The length of the wall protecting steel pipe is 3-8m, the outer diameter is 42-60mm, and the wall thickness is 3.5-4.5 mm; the diameter of the steel strand is 15-22mm.
As shown in fig. 3 to 5, the leg-locking auxiliary unit sequentially comprises a steel belt 4, an anchor backing plate 5 and an anchor device 6 from inside to outside, and the anchor device 6 applies pre-tightening force to the steel strand 3 to complete installation of the leg-locking anchor cable. The steel belt 4 is arranged along the longitudinal direction of the tunnel, a long strip-shaped hole for the steel strand 3 to pass through is arranged on the steel belt, and the anchorage device 6 adopts a commercially available single-hole anchorage device.
Specific examples are given below in connection with the installation procedure.
The utility model discloses lock foot anchor rope's installation step as follows:
(1) The length of the wall protection steel pipe 1 is 4m, the outer diameter is 50mm, the wall thickness is 4mm, a pneumatic rock drill is used for completing a first drilling hole 9 in a surrounding rock 8 on the surface of sprayed concrete between two adjacent steel frames at an arch foot of a primary support 7, the diameter of the drilling hole is 50mm, the depth of the drilling hole is 4m, the drilling hole is as long as the wall protection steel pipe, and meanwhile, the drilling hole can also be as long as the length of a free section of a locking anchor cable;
(2) The wall protecting steel pipe 1 is jacked into a first drill hole 9 in surrounding rock 8 by a pneumatic rock drill to complete the installation of the wall protecting steel pipe 1;
(3) A single pneumatic anchor cable drilling machine penetrates through the wall protecting steel pipe 1 to continue drilling in the surrounding rock 8, the diameter of the drilling hole is 28mm, the drilling is finished when the accumulated drilling depth is 5.5m, namely a second drilling hole 10 with the depth of 1.5m is formed outside the length of the wall protecting steel pipe 1, and the length of the drilling hole with the depth of 1.5m can be fully or partially used as the anchoring section length of the locking anchor cable;
(4) Under the support of the wall protection steel pipe 1, 2 pieces of Z2360 type resin anchoring agent 2 are pushed to the deepest part of a drill hole in the surrounding rock 8;
(5) Inserting the steel strand 3 with the length of 5.8m and the diameter of 21.8 m into the drilled hole, and stirring the resin anchoring agent 2 to realize the end anchoring of the steel strand 3;
(6) And (3) sequentially installing a steel belt 4, an anchor backing plate 5 and a KM22 type single-hole anchorage device 6 which are longitudinally distributed on the sprayed concrete surface along the tunnel on the exposed end of the steel strand 3 on the sprayed concrete surface of the primary support 7, and applying pretightening force to the steel strand 3 to finish the installation of the broken surrounding rock tunnel locking anchor cable.
The pipe diameter of the wall protecting steel pipe 1 is matched with the diameter of a drill hole of the pneumatic rock drill, after the wall protecting steel pipe 1 is jacked into a first drill hole 9 in surrounding rock 8 by the pneumatic rock drill, the wall protecting steel pipe is under the action of radial constraint force and axial friction resistance of the wall of the drill hole under the action of the radial shrinkage deformation of the drill hole, and therefore the wall protecting steel pipe is ensured to be permanently fixed and reserved in the first drill hole 9.
Adopt the technical scheme of the utility model, can exert the supporting role of dado steel pipe 1 to lock foot anchor rope drilling pore wall, avoid broken country rock tunnel lock foot anchor rope drilling to take place to collapse the hole and block up, ensure that resin anchoring agent 2 can reach the anchor section position through drilling smoothly, drilling that exists when having solved broken country rock tunnel lock foot anchor rope construction easily collapses hole and blocks up, resin anchoring agent installation difficulty problem. The technical effect ensures that the anchor of the lock leg anchor cable can realize successful anchoring and plays a determining role in the anchoring effect of the lock leg anchor cable. Furthermore, the utility model discloses dado steel pipe 1 that adopts among the technical scheme can compensate lock foot anchor rope bending stiffness's not enough, makes lock foot anchor rope not only possess axial tensile strength ability, still possesses certain horizontal bending resistance simultaneously.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (8)
1. The utility model provides a lock foot anchor rope for broken country rock tunnel which characterized in that: the wall protecting device comprises a steel strand (3), a wall protecting steel pipe (1) and a locking leg auxiliary unit, wherein a primary support (7) is arranged on the surface of a surrounding rock (8), and a first drilling hole (9) and a second drilling hole (10) which are coaxial are arranged in the surrounding rock (8); the wall protecting steel pipe (1) is inserted into a first drilling hole (9) in the primary support (7) sprayed concrete and surrounding rocks (8), and the end part of the wall protecting steel pipe (1) is flush with the surface of the primary support (7) sprayed concrete; one end of the steel strand (3) penetrates through the retaining wall steel pipe (1) and then goes deep into the surrounding rock (8), and is bonded in a second drilled hole (10) in the surrounding rock (8) through a resin anchoring agent (2), the locking foot auxiliary unit is arranged on the surface of sprayed concrete of the primary support (7), and pretightening force is applied to the exposed end of the steel strand (3) and is locked.
2. The anchor rope of claim 1, wherein the anchor rope comprises: the length of the anchoring section of the steel strand (3) is 1-1.5m.
3. The foot-locking anchor rope for the broken surrounding rock tunnel of claim 1, characterized in that: the diameter of the first drilling hole (9) is 42-65mm, and the diameter of the second drilling hole (10) is 24-32mm.
4. The anchor rope of claim 1, wherein the anchor rope comprises: the length of the wall-protecting steel pipe (1) is 3-8m, the outer diameter is 42-60mm, and the wall thickness is 3.5-4.5 mm.
5. The anchor rope of claim 1, wherein the anchor rope comprises: the diameter of the steel strand (3) is 15-22mm.
6. The foot-locking anchor rope for the broken surrounding rock tunnel of claim 1, characterized in that: the locking foot auxiliary unit sequentially comprises a steel belt (4), an anchor backing plate (5) and an anchor (6) from inside to outside.
7. The anchor rope of claim 6, wherein the anchor rope comprises: the steel belt (4) is provided with a strip hole for the steel strand to pass through.
8. The anchor rope of claim 6, wherein the anchor rope comprises: the anchorage device (6) is a single-hole anchorage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223355127.4U CN218882271U (en) | 2022-12-14 | 2022-12-14 | A lock foot anchor rope for broken country rock tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223355127.4U CN218882271U (en) | 2022-12-14 | 2022-12-14 | A lock foot anchor rope for broken country rock tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218882271U true CN218882271U (en) | 2023-04-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223355127.4U Active CN218882271U (en) | 2022-12-14 | 2022-12-14 | A lock foot anchor rope for broken country rock tunnel |
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| Country | Link |
|---|---|
| CN (1) | CN218882271U (en) |
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2022
- 2022-12-14 CN CN202223355127.4U patent/CN218882271U/en active Active
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