CN214944287U - Anchor net supporting structure - Google Patents
Anchor net supporting structure Download PDFInfo
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- CN214944287U CN214944287U CN202121183924.1U CN202121183924U CN214944287U CN 214944287 U CN214944287 U CN 214944287U CN 202121183924 U CN202121183924 U CN 202121183924U CN 214944287 U CN214944287 U CN 214944287U
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Abstract
The utility model discloses an anchor net supporting construction belongs to tunnel construction technical field. An anchor net supporting structure comprising: the high-strength flexible net is arranged at the arch part, the waist part and the wall part of the tunnel, the prestressed anchor rods are anchored in the surrounding rocks of the tunnel, and the connecting device is used for connecting the high-strength flexible net and the prestressed anchor rods; the connecting device comprises a first base plate and a second base plate which are positioned at the outer side and the inner side of the high-strength flexible net, and the second base plate is provided with a connecting piece; the prestressed anchor rod sequentially penetrates through the first base plate, the high-strength flexible net, the second base plate and the connecting piece and is connected with the connecting piece. The anchor net supporting structure can partially replace the original primary support, and has the characteristics of being not easy to damage, high construction speed, being capable of guaranteeing construction safety and the like, construction time is greatly shortened, tunnel construction efficiency and safety are improved, and meanwhile, the anchor net supporting structure is adopted for tunnel construction, so that the flexibility of tunnel supporting work can be improved.
Description
Technical Field
The utility model relates to a tunnel construction technical field, concretely relates to anchor net supporting construction.
Background
The existing common support system of the tunnel is a passive support system formed by combining a plurality of support measures such as sprayed concrete, non-prestressed anchor rods, reinforcing mesh, steel arch frames, secondary lining and the like.
The passive support concept cannot actively reinforce the surrounding rock in time and can not well exert the self bearing capacity of the surrounding rock, and when the tunnel with larger deformation is faced, the passive support concept is usually processed by adopting a strong support hard top mode. The release of the deformation energy of the rock mass is inhibited, so that greater surrounding rock pressure is induced, and a great amount of engineering disasters such as deformation limit invasion, arch center distortion, sprayed concrete peeling, anchor rod breakage and even collapse occur in the construction process of the tunnel. The forced hard-top passive supporting structure has the defects of low construction speed, high construction cost, poor safety and the like.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an anchor net supporting construction to solve current supporting construction in the work progress, problem that destruction, efficiency of construction are low appear in protection architecture.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
an anchor net supporting structure comprising: the high-strength flexible net is arranged at the arch part, the waist part and the wall part of the tunnel, the prestressed anchor rods are anchored in the surrounding rocks of the tunnel, and the connecting device is used for connecting the high-strength flexible net and the prestressed anchor rods; the connecting device comprises a first base plate and a second base plate which are positioned at the outer side and the inner side of the high-strength flexible net, and the second base plate is provided with a connecting piece; the prestressed anchor rod sequentially penetrates through the first base plate, the high-strength flexible net, the second base plate and the connecting piece and is connected with the connecting piece.
The utility model discloses after the tunnel excavation, paste the high strength flexible net in arch portion, waist and the wall portion in tunnel through the prestressed anchorage pole, form a protective layer, the rock mass that the high strength flexible net can catch accident and drop prevents chain collapse to can turn into mosaic structure with broken structure to a certain extent, thereby guarantee the safety of near tunnel face construction area; meanwhile, the high-strength flexible net has good deformability, and can deform along with the deformation of surrounding rocks, so that the self-supporting capability of the surrounding rocks is fully exerted. The supporting structure can replace the original primary support, not only can adapt to the deformation of surrounding rocks, but also has high construction speed and ensures the construction efficiency.
In addition, carry out the position fixed to high strength flexible net, set up first backing plate and second backing plate to anchor through the prestressed anchorage pole, thereby can bear the point type of stock and change into the face formula of high strength flexible net and bear, thereby show improvement supporting construction's stress state, guarantee the stability in tunnel.
Furthermore, the connecting piece is bowl-shaped and is buckled on the second backing plate.
The utility model discloses a connecting piece that is the bowl form carries out the transmission of force, can effectively transmit great contact stress between the bolt on connecting piece and the prestressed anchorage pole to between connecting piece and the second backing plate, produces less contact stress, ensures that the second backing plate can not damaged, can also improve and pass the power effect, ensures that the connecting piece can not damaged.
Furthermore, the first backing plate and the second backing plate are respectively provided with a groove matched with the net wire of the high-strength flexible net at one side close to the high-strength flexible net.
The utility model discloses with the net twine card of the flexible net of high strength in the space that the recess of first backing plate and the recess of second backing plate formed, reduce the local cutting effect of each backing plate to the flexible net of high strength, ensure the reliability of the net twine of the flexible net of high strength at the junction.
Furthermore, the first backing plate and the second backing plate are made of metal, and a rubber deformation layer used for reducing abrasion to the net wires of the high-strength flexible net is arranged in the groove.
The utility model discloses following beneficial effect has:
(1) the anchor net supporting structure of the utility model can convert the excavation crushing structure into an embedded structure to a certain extent, and ensure the safety of the construction area near the tunnel face; meanwhile, the supporting structure has good deformation capacity and can generate cooperative deformation along with the deformation of surrounding rocks, so that the self-supporting capacity of the surrounding rocks is fully exerted, the supporting structure can replace the original primary support, not only can the deformation of the surrounding rocks be adapted, but also the construction speed is high, and the construction efficiency is ensured.
(2) The utility model discloses can bear the point type of stock and change the face formula of the flexible net of high strength into and bear to show improvement supporting construction's stress state, guarantee the stability in tunnel.
(3) The utility model discloses after excavating the ground to the single footage length within range, only through drilling, place first backing plate, high strength flexible net and prestressed anchorage pole, the cover is established second backing plate and connecting piece and is applyed steps such as prestressing force to the prestressed anchorage pole and can form the anchor net supporting construction who has the ability of strutting to the country rock fast, construction steps is simple, need not execute at once and do preliminary bracing just can carry out the excavation of next unit footage ground body, shorten the excavation time in tunnel greatly, thereby improve the excavation efficiency in tunnel greatly.
(4) Meanwhile, the anchor net supporting structure can hold rock blocks falling accidentally, prevents chain collapse, and can convert a crushing structure into an embedded structure to a certain extent; the deformation of the surrounding rock can be self-adapted, and the self-bearing capacity of the surrounding rock is fully exerted, so that safety accidents of deformation limit invasion, arch frame distortion, sprayed concrete peeling, anchor rod breakage, even collapse and the like caused by adopting other supporting structures are avoided.
Drawings
Fig. 1 is a schematic structural view of an anchor net supporting structure of the present invention;
fig. 2 is a schematic structural view of the connecting device of the present invention;
FIG. 3 is a schematic connection diagram of the prestressed anchor of the present invention;
fig. 4 is a schematic cross-sectional structure view of the connecting device of the present invention;
fig. 5 is a schematic structural view of the second pad of the present invention.
In the figure: 10-high strength flexible mesh; 20-prestressed anchor rods; 30-a connecting means; 31-a first pad; 32-a second shim plate; 33-connecting piece.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Example 1
Referring to fig. 1, an anchor net supporting structure includes a high-strength flexible net 10 and a plurality of prestressed anchors 20. The high-strength flexible net 10 is disposed on the exposed surfaces of the tunnel arch, the waist and the wall, all the pre-stressed anchors 20 pass through the high-strength flexible net 10 and are anchored into the surrounding rock, and each pre-stressed anchor 20 places the high-strength flexible net 10 on the exposed surfaces of the tunnel arch, the waist and the wall through the connection means 30. In this embodiment, the high-strength flexible net 10 is made of a high-strength polyester fiber flexible net, and the maximum side length of the mesh of the high-strength flexible net 10 is not more than 200mm, the minimum side length is not more than 100mm, and the side length deviation of the mesh is not more than 2 mm. In other embodiments of the present invention, the material of the high-strength flexible net 10 may also be metal.
Referring to fig. 2 to 5, the connecting device 30 includes a first pad 31, a second pad 32 and a connecting member 33. The first backing plate 31 and the second backing plate 32 are consistent in structure and are respectively arranged on two sides of the high-strength flexible net 10, the first backing plate 31 is located between the high-strength flexible net 10 and surrounding rocks, one side, close to the high-strength flexible net 10, of the first backing plate 31 and the second backing plate 32 is respectively provided with a groove matched with a net line of the high-strength flexible net 10, the groove of the first backing plate 31 corresponds to the groove of the second backing plate 32, a limiting space is formed, and the net line of the high-strength flexible net 10 is limited in the space. In this embodiment, the first pad 31 and the second pad 32 are made of metal, and in order to reduce the wear of the wires of the high-strength flexible net 10, a deformation layer, such as made of soft rubber, is disposed in the groove.
The first shim plate 31, the second shim plate 32 and the connecting member 33 are provided with through holes for the pre-stressed anchor 20 to pass through. The connecting piece 33 is the bowl form, and the lock is on second backing plate 32, prestressed anchorage pole 20 passes connecting piece 33 in proper order, first backing plate 31, high strength flexible net 10, stretch into the country rock behind the second backing plate 32, because the net twine restriction of high strength flexible net 10 is in the recess of first backing plate 31 and second backing plate 32, consequently, prestressed anchorage pole 20 can not produce the interference with the net twine of high strength flexible net 10, can not cause the damage to high strength flexible net 10, ensure the integrality of high strength flexible net 10. The pre-stressed anchor rod 20 tightens the connecting piece 33 through the nut, and the high-strength flexible net 10 is fixed through the pre-tightening force generated by the nut and provides supporting force for falling rocks.
Example 2
A tunnel active-passive supporting construction method based on the anchor net supporting structure of embodiment 1 includes the steps of:
s1: according to the length of the single footage, the excavation work of the rock and soil body in the range is completed;
s2: the method comprises the following steps of (1) carrying out roof finding on an excavated part of the tunnel, and cleaning dangerous stones at the top of the tunnel to avoid falling of the dangerous stones caused by drilling vibration;
s3: arranging the high-strength flexible net 10 on the exposed surfaces of the arch part, the waist part and the wall part of the tunnel, and preliminarily fixing the high-strength flexible net 10 on the exposed surfaces by adopting a nail shooting method, a rapid bar planting method or other modes;
s4: drilling holes on exposed surfaces of the arch part, the waist part and the wall part of the tunnel according to the design position of the prestressed anchor rod 20;
s5: installing and fixing a first pad 31 at the drilling position by means of the space of the longitudinal ends and the meshes;
s6: sequentially penetrating the anchoring agent and the prestressed anchor rod 20 through the high-strength flexible net 10 and the first base plate 31 and extending into the drill hole, and bonding the end part of the prestressed anchor rod 20 with the surrounding stratum through the anchoring agent to realize the anchoring of the end part of the prestressed anchor rod 20; in the present embodiment, the anchoring agent is a resin grouting material;
s7: sequentially sleeving a second backing plate 32 and a connecting piece 33 on the free end of the prestressed anchor rod 20, and applying prestress to the prestressed anchor rod 20 through nuts by means of a torque wrench, so that two sides of the second backing plate 32 are respectively in close contact with the high-strength flexible net 10 and the connecting piece 33, and the high-strength flexible net 10 is tightly prepared;
s8: and repeating the steps S1 to S6 to enable the longitudinally adjacent high-strength flexible nets 10 to be lapped, arranging drill holes at the lapping positions, fixing the drill holes through the first base plate 31, the second base plate 32, the connecting piece 33 and the prestressed anchor rods 20, and then sequentially performing primary support and secondary lining to finish the tunnel construction work.
In this embodiment, the construction method of the primary support and the secondary lining is as follows: according to the stability and monitoring data of the tunnel, after the construction of the anchor net supporting structure of the section is finished, immediately spraying concrete and/or constructing a steel frame on the anchor net supporting structure of the upper section to finish the construction of primary support, circulating the steps, constructing secondary lining according to the deformation condition of the primary support, and finally finishing the construction work of the tunnel.
Example 3
The difference between the example 3 and the example 2 is that the primary support and the secondary lining are implemented differently in step S8, and the specific implementation manner is as follows: for the condition that the tunnel is stable, the anchor net supporting structure can be continuously constructed, so that the working efficiency near the tunnel face is improved; when the construction of the tunnel face is not influenced, concrete is sprayed and/or a steel frame is constructed on the anchor net supporting structure of the corresponding section, the construction of primary support is completed, secondary lining is constructed according to the deformation condition of the primary support, and finally the construction work of the tunnel is completed.
The anchor net supporting structure has certain supporting capacity, the construction process of the sprayed concrete and the steel frame in primary support can be flexibly adjusted backwards, and the circulating process of tunnel excavation and supporting is optimized, so that the construction time of the sprayed concrete and the steel frame can be adjusted according to the specific conditions of the construction process in the whole tunnel construction, the tunnel excavation and supporting flexibility is improved, the construction time of the primary support near the tunnel face of the tunnel is effectively shortened, the problem of multi-process occupation of limited space of the tunnel face is solved, and the tunnel excavation efficiency is effectively improved.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (5)
1. An anchor net supporting structure, comprising: the high-strength flexible net anchor device comprises a high-strength flexible net (10) arranged at the arch part, the waist part and the wall part of a tunnel, a prestressed anchor rod (20) anchored in surrounding rocks of the tunnel and a connecting device (30) for connecting the high-strength flexible net (10) and the prestressed anchor rod (20); the connecting device (30) comprises a first backing plate (31) and a second backing plate (32) which are positioned at the outer side and the inner side of the high-strength flexible net (10), and a connecting piece (33) is arranged on the second backing plate (32); the prestressed anchor rod (20) sequentially penetrates through the first base plate (31), the high-strength flexible net (10), the second base plate (32) and the connecting piece (33) and is connected with the connecting piece (33).
2. A bolting configuration according to claim 1, wherein said connecting member (33) is bowl-shaped and is snap-fitted to said second pad (32).
3. A bolting structure according to claim 2, wherein the sides of said first and second tie plates (31, 32) adjacent to said high strength flexible net (10) are provided with grooves for engaging with the wires of said high strength flexible net (10).
4. A supporting construction for an anchor net according to claim 3, wherein the first pad (31) and the second pad (32) are made of metal, and a rubber deformation layer for reducing abrasion to the wire of the high-strength flexible net (10) is provided in the groove.
5. A bolting structure according to any of claims 1 to 4, wherein said high strength flexible net (10) is of an organic fibre material or a metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121183924.1U CN214944287U (en) | 2021-05-28 | 2021-05-28 | Anchor net supporting structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121183924.1U CN214944287U (en) | 2021-05-28 | 2021-05-28 | Anchor net supporting structure |
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| CN214944287U true CN214944287U (en) | 2021-11-30 |
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| CN202121183924.1U Active CN214944287U (en) | 2021-05-28 | 2021-05-28 | Anchor net supporting structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202503A (en) * | 2021-05-28 | 2021-08-03 | 中国铁路经济规划研究院有限公司 | Anchor net supporting structure and tunnel active-passive supporting construction method |
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2021
- 2021-05-28 CN CN202121183924.1U patent/CN214944287U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202503A (en) * | 2021-05-28 | 2021-08-03 | 中国铁路经济规划研究院有限公司 | Anchor net supporting structure and tunnel active-passive supporting construction method |
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