CN210530875U - Supporting construction in asymmetric little clean distance tunnel - Google Patents
Supporting construction in asymmetric little clean distance tunnel Download PDFInfo
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- CN210530875U CN210530875U CN201921253740.0U CN201921253740U CN210530875U CN 210530875 U CN210530875 U CN 210530875U CN 201921253740 U CN201921253740 U CN 201921253740U CN 210530875 U CN210530875 U CN 210530875U
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Abstract
A supporting structure of an asymmetric small-clear-distance tunnel supports the arch waist and the top of the tunnel for the first time through a small advanced conduit and an anchor rod; the anchor rods and the steel frames support the vault of the tunnel for the second time, and the secondary lining supports the full section of the tunnel; the steel frame supports the large-section tunnel again, and the steel arch structure supports the middle rock pillar part between the large-section tunnel and the small-end-face tunnel again; the tunnel supporting system with certain safety degree is formed together with surrounding rocks, various loads which may occur are borne, the stability of the section of the tunnel is kept, and the tunnel supporting system has the characteristics of simple structure, reasonable design, simplicity and convenience in construction, high construction efficiency and good using effect.
Description
Technical Field
The utility model belongs to the tunnel support field, concretely relates to supporting construction in asymmetric little clean apart from tunnel.
Background
In tunnel engineering, in order to adapt to changes of geological conditions and structural conditions, effectively control surface subsidence caused by tunnel construction and maintain stability of surrounding rocks in a construction area, various single supporting methods such as anchor rods, sprayed concrete, steel arches and the like are combined properly to jointly form a reasonable, effective and economic supporting structure. If the primary support is not performed in time, the deformation of the surrounding rock may exceed the allowable range, and in severe cases, the tunnel face is unstable, the tunnel collapses, and great economic loss is caused. At the moment, the deformation of the surrounding rock is controlled by adopting a tunnel advance support measure, so that the aim of ensuring the safety of tunnel construction is fulfilled, and the advance support auxiliary construction measure can effectively avoid the collapse of the excavation face of the tunnel and reduce the excessive deformation of the stratum of the construction area. Wherein, the advanced small conduit is widely applied to underground engineering of vast tunnels. In the tunnel construction process, the most important advantages of the advanced small duct grouting technology compared with other advanced support methods mainly have the advantages of low construction level requirement, simple construction process and flow and obvious economic benefit. In addition, the advanced small guide pipe grouting adopted in the construction has higher adaptability under different soil body environments, and the construction scheme can be timely adjusted if the soil quality of the stratum changes greatly.
For the asymmetric small-clear-distance tunnel, the load and deformation of the two sections have certain difference, and the two sections can influence each other. Along with the gradual increase of two tunnel distances, the plasticity scope that the pillar receives in the loess area small clear distance tunnel can reduce gradually, and comparatively obvious through phenomenon will appear gradually in the plasticity district, and the emergence of this phenomenon probably can make to make whole well pillar take place great destruction, and then leads to the unstability of the soil body to collapse in the excavation construction.
At present, asymmetric small-clear-distance tunnels are rare, support in the tunnel excavation process is always blindness, for example, no matter the size of a tunnel section, the current conventional method adopts a unified support measure, so that the situation of over conservation exists for small-section tunnels, unnecessary waste is caused, and the situation of being more unsafe exists for large-section tunnels, and construction potential safety hazards exist. There is therefore room for optimization of the support structure for asymmetric small clear distance tunnels.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art, the utility model aims to provide a supporting construction in asymmetric little clear distance tunnel constitutes the tunnel support system who has certain degree of safety through this supporting construction and country rock together, can bear the various loads that probably appear, keeps the sectional stability in tunnel, has simple structure, and it is convenient to support, easily dismantles, the high characteristics of security.
In order to achieve the above purpose, the technical solution of the present invention is realized as follows:
the utility model provides a supporting construction in asymmetric little net distance tunnel which characterized in that: the supporting structure comprises a first supporting structure, a second supporting structure, a third supporting structure and a fourth supporting structure; supporting construction one contact with the tunnel inner wall, supporting construction two sets up the inlayer at supporting construction one, supporting construction three sets up the inlayer at large section tunnel top supporting construction two, supporting construction one and supporting construction two, supporting construction two and supporting construction three, supporting construction two and supporting construction four between adopt the concrete to be connected:
furthermore, the first supporting structure comprises a small advanced guide pipe and anchor rods, wherein the small advanced guide pipe and the anchor rods are arranged on the top and the side inner walls of the large-section tunnel and the top and the side inner walls of the small-section tunnel, the small advanced guide pipe is arranged along the direction of the tunnel, and the anchor rods are distributed along the inner wall of the tunnel in a launching manner;
furthermore, the second supporting structure comprises an anchor rod and a steel frame which are arranged at the top of the large-section tunnel and the top of the small-end-face tunnel, and the anchor rod is rigidly connected with the steel frame;
furthermore, the supporting structure III comprises a steel supporting structure arranged inside the large-section tunnel, and the top of the large-section tunnel is supported through the steel supporting structure;
and furthermore, the supporting structure IV comprises a steel arch structure arranged in the middle of the large-section tunnel and the small-section tunnel, and the side wall of the large-section tunnel and the side wall of the small-section tunnel are supported through the steel arch structure.
Furthermore, the steel arch structure comprises a steel arch and pull rods, the steel arch comprises a first steel arch arranged in the large-section tunnel and a second steel arch arranged in the small-section tunnel, and the first steel arch and the second steel arch are rigidly connected through at least 3 pull rods.
Furthermore, the first steel arch is not more than 1/4 the perimeter of the large-section tunnel, and the second steel arch is not more than 1/4 the perimeter of the small-section tunnel.
Further, the steel support structure include truss and steel foot rest, the truss is fixed to be set up on the steel foot rest, the truss passes through shoulder and top and supports tunnel top pressure.
Further, the span of the truss does not exceed 2/3 of the diameter of the tunnel, and the truss is connected with the steel foot frame through bolts.
Furthermore, the density of the anchor rod of the large-section tunnel is greater than that of the anchor rod of the small-section tunnel.
Furthermore, the steel frame of the large-section tunnel adopts a profile steel frame, and the steel frame of the small-section tunnel adopts a grid steel frame.
Furthermore, the size of the steel section steel frame is not more than 1/4 of the perimeter of the large-section tunnel, and the size of the grid steel frame is not more than 1/4 of the perimeter of the small-section tunnel.
Furthermore, the inner surfaces of the large-section tunnel and the small-section tunnel are sprayed with sprayed concrete, and the advanced small guide pipe is filled with grouting.
The utility model has the advantages that:
compared with the prior art, the support structure of the asymmetric small-clear-distance tunnel provided by the utility model has the advantages that firstly, the support structure carries out advanced support on the arch waist and the vault of the tunnel through the advanced small conduit and the anchor rod; the supporting structure II carries out secondary supporting on the vault of the tunnel through an anchor rod and a steel frame; the supporting structure III supports the large-section tunnel again through a steel supporting structure; the supporting structure IV supports the middle rock pillar of the large-section tunnel and the small-section tunnel through the steel arch structure, forms a tunnel supporting system with certain safety degree together with surrounding rocks, bears various loads which possibly occur, keeps the stability of the section of the tunnel, and has the characteristics of simple structure, reasonable design, simple and convenient construction, high construction efficiency, good use effect and high stability.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of a grid type steel mesh.
Wherein: 1. the system comprises a small advanced guide pipe, 2 anchor rods, 3 steel frames, 4 secondary lining, 5 drainage ditches, 6 steel arch structures, 7 steel arches, 8 pull rods, 9 steel support structures, 10 trusses, 11 steel foot frames, 12 grid steel frames, 13 drainage pipelines I and 14 drainage pipelines II.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, a supporting structure of an asymmetric small-clear-distance tunnel includes a first supporting structure, a second supporting structure, a third supporting structure and a fourth supporting structure; the supporting structure I belongs to a forepoling structure at the initial stage of tunnel excavation and is in contact with the inner wall of the tunnel; the supporting structure II belongs to primary supporting of tunnel excavation and is arranged on the inner layer of the supporting structure I; the supporting structure III belongs to secondary supporting after excavation of the top of the large-section tunnel and is arranged on the inner layer of the large-section tunnel supporting structure II; and the supporting structure II, the supporting structure II and the supporting structure III are connected with the supporting structure II through concrete.
The supporting structure is also called a forepoling, and comprises a forepoling small conduit 1 filled with grouting and an anchor rod 2 inserted into the inner wall of the tunnel hole for grouting and applying prestress, so as to form a first layer of supporting for the tunnel hole.
The second supporting structure is also called primary supporting and comprises a steel frame 3 arranged at the tops of a large-section tunnel and a small-section tunnel, wherein the steel frame 3 adopts a steel section frame with higher rigidity at the large-section tunnel and is connected with one end of the anchor rod 2, which extends out of the inner wall, through a hole reserved in the steel section frame by a bolt; the steel frame 3 adopts softer grid steelframe 12 in small cross section tunnel department, and grid steelframe 12 is articulated with stock 2 for stock 2 and steelframe 3 form a whole, and the pulling force effect through stock 2 and the supporting role of steelframe 3 carry out secondary to tunnel hole top and strut.
The supporting structure III comprises a steel supporting structure 9 arranged in the large-section tunnel, the steel supporting structure 9 comprises a truss 10 and a steel foot rest 11, the pressure of the top of the tunnel is transmitted to one end of the steel foot rest 11 fixedly connected with the truss 10 through the shoulder and the top of the truss 10, and the other end of the steel foot rest 11 is supported at the bottom of the tunnel to support the pressure from the top of the tunnel;
the supporting structure IV comprises a steel arch structure 6 arranged in the middle of the large-section tunnel and the small-section tunnel and at the middle rock pillar part; the steel arch structure 6 comprises a steel arch 7 and a pull rod 8, the steel arch 7 comprises a steel arch I arranged in a large section tunnel and a steel arch II arranged in a small section tunnel, the steel arch I and the steel arch II are connected through the pull rod 8 bolts of 3 rock pillars, the rock pillars in the middle of the large section tunnel and the small section tunnel are prevented from being run through and being unstable, collapse is prevented, the steel arch 7 can also utilize the constraint force of the arch, and even if the rock pillars in the middle of the section tunnel and the small section tunnel are unstable and deformed, the whole rock pillar part still is a whole.
The secondary lining 4 is used as an auxiliary supporting means, is constructed after the primary supporting structure is stable, and is built by adopting concrete lining; for the structure provides safe deposit, reduces the destruction of water pressure to the tunnel hole section, large cross section tunnel bottom is provided with drainage pipe one 13, and small cross section tunnel bottom is provided with drainage pipe two 14, and drainage pipe one 13 and drainage pipe two 14 link to each other with the escape canal 5 that sets up in middle rock pillar bottom in large cross section tunnel and small cross section tunnel respectively, concentrate the drainage through escape canal 5 to the tunnel hole.
In order to ensure safety and to leave enough construction space, the span of the truss 10 does not exceed 2/3 of the diameter of the tunnel, and the truss 10 and the steel foot frame 11 are bolted for easy disassembly.
In order to reduce the pressure of the top of the tunnel to the steel frame 3, reduce the burden of the anchor rod 2, ensure the safety of a supporting structure and save materials, the size of the section steel frame is not more than 1/4 of the perimeter of the large-section tunnel, and the size of the grid steel frame 12 is not more than 1/4 of the perimeter of the small-section tunnel; the steel frame 3 can also be arranged at the side part and the top part of the tunnel along the inner wall of the tunnel hole.
In order to prevent the steel arch 7 from intersecting with the steel frame 3, facilitate supporting and save materials, the first steel arch is not more than 1/4 of the perimeter of the large-section tunnel, and the second steel arch is not more than 1/4 of the perimeter of the small-section tunnel.
Because the large-section tunnel has larger span and larger pressure at the top of the tunnel, the density of the anchor rod 2 of the large-section tunnel is larger than that of the anchor rod 2 of the small-section tunnel.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The utility model provides a supporting construction in asymmetric little net distance tunnel which characterized in that: the supporting structure comprises a first supporting structure, a second supporting structure, a third supporting structure and a fourth supporting structure; supporting construction one contact with the tunnel inner wall, supporting construction two sets up the inlayer at supporting construction one, supporting construction three sets up the inlayer at large section tunnel top supporting construction two, supporting construction one and supporting construction two, supporting construction two and supporting construction three, supporting construction two and supporting construction four between adopt the concrete to be connected:
the first supporting structure comprises a small advanced guide pipe (1) and anchor rods (2) which are arranged on the inner walls of the top and the side parts of the large-section tunnel and the inner walls of the top and the side parts of the small-section tunnel, the small advanced guide pipe (1) is arranged along the tunnel direction, and the anchor rods (2) are distributed along the inner wall of the tunnel in a launching manner;
the second supporting structure comprises an anchor rod (2) and a steel frame (3) which are arranged at the top of the large-section tunnel and the top of the small-end-face tunnel, and the anchor rod (2) is rigidly connected with the steel frame (3);
the supporting structure III comprises a steel supporting structure (9) arranged inside the large-section tunnel, and the top of the large-section tunnel is supported through the steel supporting structure (9);
and the supporting structure IV comprises a steel arch structure (6) arranged in the middle of the large-section tunnel and the small-section tunnel, and the side wall of the large-section tunnel and the side wall of the small-section tunnel are supported through the steel arch structure (6).
2. The supporting structure of an asymmetric small-clear-distance tunnel according to claim 1, wherein: the steel arch structure (6) comprises a steel arch (7) and pull rods (8), the steel arch (7) comprises a first steel arch arranged in the large-section tunnel and a second steel arch arranged in the small-section tunnel, and the first steel arch and the second steel arch are rigidly connected through at least 3 pull rods (8).
3. The supporting structure of an asymmetric small-clear-distance tunnel according to claim 2, characterized in that: the first steel arch is not more than 1/4 of the perimeter of the large-section tunnel, and the second steel arch is not more than 1/4 of the perimeter of the small-section tunnel.
4. The supporting structure of an asymmetric small-clear-distance tunnel according to claim 1, wherein: the steel supporting structure (9) comprises a truss (10) and a steel foot frame (11), the truss (10) is fixedly arranged on the steel foot frame (11), and the truss (10) supports the pressure of the top of the tunnel through a shoulder and the top.
5. The supporting structure of an asymmetric small-clear-distance tunnel according to claim 4, wherein: the span of the truss (10) does not exceed 2/3 of the diameter of the tunnel, and the truss (10) is connected with the steel foot frame (11) through bolts.
6. The supporting structure of an asymmetric small-clear-distance tunnel according to claim 1, wherein: the density of the anchor rod (2) of the large-section tunnel is greater than that of the anchor rod (2) of the small-section tunnel.
7. The supporting structure of an asymmetric small-clear-distance tunnel according to claim 1, wherein: the steel frame (3) of the large-section tunnel is a profile steel frame, and the steel frame (3) of the small-section tunnel is a grid steel frame (12).
8. The supporting structure of an asymmetric small-clear-distance tunnel according to claim 7, wherein: the size of the steel section steel frame is not more than 1/4 of the perimeter of the large-section tunnel, and the size of the grid steel frame (12) is not more than 1/4 of the perimeter of the small-section tunnel.
9. The supporting structure of an asymmetric small-clear-distance tunnel according to claim 1, wherein: the inner surfaces of the large-section tunnel and the small-section tunnel are sprayed with sprayed concrete, and the advanced small guide pipe (1) is filled with grouting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921253740.0U CN210530875U (en) | 2019-08-05 | 2019-08-05 | Supporting construction in asymmetric little clean distance tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921253740.0U CN210530875U (en) | 2019-08-05 | 2019-08-05 | Supporting construction in asymmetric little clean distance tunnel |
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| Publication Number | Publication Date |
|---|---|
| CN210530875U true CN210530875U (en) | 2020-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921253740.0U Expired - Fee Related CN210530875U (en) | 2019-08-05 | 2019-08-05 | Supporting construction in asymmetric little clean distance tunnel |
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| CN (1) | CN210530875U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047865A (en) * | 2021-03-31 | 2021-06-29 | 中建二局第三建筑工程有限公司 | Clamping and reinforcing bent frame for middle rock pillar of large-section small-clear-distance tunnel and construction method of clamping and reinforcing bent frame |
-
2019
- 2019-08-05 CN CN201921253740.0U patent/CN210530875U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047865A (en) * | 2021-03-31 | 2021-06-29 | 中建二局第三建筑工程有限公司 | Clamping and reinforcing bent frame for middle rock pillar of large-section small-clear-distance tunnel and construction method of clamping and reinforcing bent frame |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200515 Termination date: 20210805 |