CN211950516U - Rock pillar structure and system for replacing high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnel - Google Patents
Rock pillar structure and system for replacing high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnel Download PDFInfo
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- CN211950516U CN211950516U CN202020538726.1U CN202020538726U CN211950516U CN 211950516 U CN211950516 U CN 211950516U CN 202020538726 U CN202020538726 U CN 202020538726U CN 211950516 U CN211950516 U CN 211950516U
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Abstract
The utility model discloses a rock pillar structure and system in high ground stress soft rock large deformation super little clear distance tunnel replacement, including concrete, fastener and a plurality of prestressing force connecting pipe, the both ends of prestressing force connecting pipe are used for connecting first branch and repair the tunnel with the second branch, and a plurality of prestressing force connecting pipes set up along vertical direction in bank contact, are equipped with a plurality of holes on the prestressing force connecting pipe, and concrete placement is in the prestressing force connecting pipe, and the clearing hole spills over the gap of pouring between a plurality of prestressing force connecting pipes, and the fastener is used for fixed connection prestressing force connecting pipe and first branch to repair tunnel and second branch to repair the tunnel. The prestress can apply pressure to the connecting piece in advance before bearing external load, can totally or partially offset the tensile stress that external load leads to when bearing the effect of external load, avoids rock pillar structural damage in the replacement, reaches the purpose of rock pillar in the replacement, has avoided the condition that stress concentration can not be from steady in the work progress, has guaranteed the security and the stability of work progress.
Description
Technical Field
The utility model relates to a rock pillar structure and system in the railway tunnel field, especially high ground stress soft rock large deformation super little clear distance tunnel replacement.
Background
Railway engineering can be divided into single-track railways and double-track railways according to the number of the main tracks, and the plane arrangement of the double-track railways in the tunnel is usually combined and repaired into one double-track tunnel arrangement, and is also divided into two single-track tunnels. However, for various reasons, it is sometimes necessary to change from one double-wire tunnel to two single-wire tunnels in the tunnel, and it is necessary to set a combined repair span and a separate repair small-clearance section in the tunnel. At present, in a railway tunnel under construction or put into operation, a section with good surrounding rock geological conditions is generally selected as a combined and separated repair transition section, and the complicated stress of an ultra-small clear distance tunnel structure in the construction process is mainly considered, the mutual influence is large in the construction of a left line and a right line, and the stress of the structure needs to be converted for many times to form a complicated three-dimensional stress state. If the tunnel surrounding rock is hard and complete, the good self-bearing capacity of the tunnel surrounding rock can share more surrounding rock load, the supporting structure is stable, and the construction difficulty and the construction risk are relatively low.
However, with the continuous development of railway construction in China, the planning of a railway network is continuous and perfect, more and more tunnels are built in complex and difficult mountain areas, and various complex geological problems occur in the construction process, wherein the situation of large deformation of high ground stress soft rock frequently occurs. Due to the restriction of various factors such as large curve radius, complex topographic and geological conditions and the like on a line extending line, the tunnel joint and separate repair transition section has to be arranged in a high-ground-stress soft rock large-deformation tunnel.
The high-ground-stress soft rock large-deformation tunnel is large in processing difficulty and high in construction risk, and when the combined and separated repair transition section ultra-small clear distance tunnel is arranged in the high-ground-stress soft rock large-deformation section, the stress of the two tunnel structures is very complex. In the construction of the ultra-small clear distance tunnel with the clear distance smaller than 5m, the medium rock pillar is a rock mass located in the middle of the ultra-small clear distance tunnel, and has an extremely important effect on keeping the two tunnels stable. In the construction process of the ultra-small clear distance tunnel in the high ground stress soft rock large deformation section, the middle rock pillar is subjected to stress concentration and secondary stress field superposition and cannot be self-stabilized, and the tunnel collapse accident is easily caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the method aims at the problems that in the construction process of the ultra-small clear distance tunnel in the high-ground-stress soft-rock large-deformation section, the middle rock pillar cannot be self-stabilized due to stress concentration and secondary stress field superposition, and the tunnel is prone to collapse accidents, and provides a middle rock pillar structure for replacing the high-ground-stress soft-rock large-deformation ultra-small clear distance tunnel.
In order to realize the purpose, the utility model discloses a technical scheme be:
the high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnel replacing medium rock pillar structure comprises concrete, a fastener and a plurality of prestress connecting pipes;
one end of each prestress connecting pipe is used for being connected with the first sub-repair tunnel, the other end of each prestress connecting pipe is used for being connected with the second sub-repair tunnel, and the plurality of prestress connecting pipes are arranged in a row in a contact mode along the vertical direction;
the prestressed connecting pipes are provided with a plurality of holes, concrete is poured in the prestressed connecting pipes and overflows through the holes to pour gaps among the prestressed connecting pipes;
the prestress connecting pipe is connected with the first sub-repairing tunnel through a fastening piece, and the prestress connecting pipe is connected with the second sub-repairing tunnel through a fastening piece.
By the structure, concrete is poured in the prestressed connecting pipes and gaps among the prestressed connecting pipes, the prestress can apply pressure to the connecting pieces in advance before bearing external load, the pre-applied pressure can completely or partially offset tensile stress caused by the external load when bearing the external load, and the rock pillar structure in replacement is prevented from being damaged, so that the safety and the stability of the rock pillar structure in replacement are improved, the aim of replacing the rock pillar is fulfilled by the prestressed connecting pipes and the concrete, the conditions of stress concentration and incapability of self-stabilization in the construction process of the ultra-small clear distance tunnel in the high-ground stress soft rock large deformation zone are avoided, the rock pillar structure in replacement is connected with the first divided tunnel and the second divided tunnel into a whole by the fastening piece to bear the surrounding rock pressure of the high-ground stress soft rock large deformation zone together, and the safety and the stability of the construction process of the ultra-small clear distance tunnel in the high-ground stress soft rock large deformation zone are ensured, the construction is convenient.
In the utility model, the arrangement of the plurality of prestressed connecting pipes in a row along the vertical direction means that the bottoms and the tops of the adjacent prestressed connecting pipes are contacted together;
the utility model discloses well super little clear apart from tunnel is the clear apart from being less than 5 m's tunnel.
As the preferred scheme of the utility model, the prestressing force connecting pipe is the prestressing force steel pipe. Through above-mentioned structure, prestressing force steel pipe intensity is high, and the atress ability is good, can improve the security and the stability of rock pillar structure in the replacement.
As the preferred scheme of the utility model, the concrete is high-strength concrete. Through the structure, the high-strength concrete has high strength and good stress performance, and can improve the stability and safety of the rock pillar structure in replacement.
As the utility model discloses an optimal scheme, the fastener includes steel backing plate and bolt, and the bolt passes the steel backing plate, and the prestressing force connecting pipe links to each other through the bolt with first minute tunnel of repairing, and the prestressing force connecting pipe is divided with the second and is repaired the tunnel and pass through the bolt and link to each other.
The high-ground-stress soft rock large-deformation ultra-small clear distance tunnel middle rock pillar replacing system comprises a middle rock pillar replacing structure and a sub-repair tunnel, wherein the sub-repair tunnel comprises a first sub-repair tunnel and a second sub-repair tunnel;
and the rock pillar structure in the replacement is fixedly arranged between the first sub-tunnel and the second sub-tunnel.
The first sub-tunnel is provided with a first primary support, the second sub-tunnel is provided with a second primary support, and two ends of the prestress connecting pipe are fixedly connected with the first primary support and the second primary support respectively.
Through the structure, the rock pillar system can bear the surrounding rock pressure of a high-ground-stress soft rock large-deformation section in replacement, and the safety and the stability of the ultra-small clear distance tunnel in the construction process are ensured.
As the utility model discloses a preferred scheme, the length of rock pillar structure is less than or equal to the net distance between first branch repair tunnel and the second branch repair tunnel in the replacement, and the length of rock pillar structure is greater than first distance between strutting and the second first distance of strutting in the replacement simultaneously. Through the structure, resources and cost can be saved while the safety and stability of the ultra-small clear distance tunnel construction process are ensured.
As the utility model discloses an optimal scheme, the top of rock pillar structure is not higher than the junction of dividing to repair tunnel hunch portion and side wall in the replacement, and the bottom of rock pillar structure is not less than the side wall corner of dividing to repair the tunnel in the replacement. Through the structure, during construction, the first tunnel of dividing of being under construction earlier, second tunnel upper portion and middle part of dividing and repairing are under construction again, and the top of rock pillar structure is not higher than the junction of dividing and repairing tunnel hunch portion and side wall in the replacement has guaranteed that the operation space in the dividing and repairing tunnel can hold the prestressing force connecting pipe, ensures that the prestressing force connecting pipe can get into and divide and repair the inside tunnel of being under construction, and the rock pillar structure has sufficient operation space in the assurance replacement in the work progress.
As the utility model discloses a preferred scheme, first support including first upper portion first, first middle part first and first lower portion first, first upper portion first sets up tunnel upper portion is repaiied in first branch, first middle part first sets up tunnel middle part is repaiied in first branch, first lower portion first sets up tunnel lower part is repaiied in first branch. Through the structure, the first primary support is used for supporting and protecting the tunnel in the first tunnel repairing construction process.
As the utility model discloses a preferred scheme, the second is just strutted including second upper portion just, the second middle part is just propped and just prop up with the second lower part, and the second upper portion is just propped up the setting and is repaiied tunnel upper portion at the second, and the second middle part is just propped up the setting and is repaiied tunnel middle part at the second, and the second lower part is just propped up the setting and is repaiied tunnel lower part at the second. Through the structure, the second primary support is used for supporting and protecting the tunnel in the second tunnel repairing construction process.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
concrete is poured in the prestressed connecting pipes and gaps among the prestressed connecting pipes, the prestress can apply pressure to the connecting pieces in advance before bearing external load, the pre-applied pressure can completely or partially offset tensile stress caused by the external load when bearing the external load, the structural damage of the rock pillar in replacement is avoided, the safety and the stability of the rock pillar structure in replacement are improved, the aim of replacing the rock pillar is achieved by the prestressed connecting pipes and the concrete, the situations that stress is concentrated and cannot be self-stabilized in the construction process of the ultra-small clear distance tunnel in the high-ground stress soft rock large deformation section are avoided, the rock pillar structure in replacement is connected with the first repairing tunnel and the second repairing tunnel into a whole by the fastening piece, the surrounding rock pressure of the high-ground stress soft rock large deformation section is jointly borne, and the safety and the stability of the construction process of the ultra-small clear distance tunnel in the high-ground stress soft rock large deformation section are ensured, the construction is convenient.
Drawings
FIG. 1 is a schematic structural diagram of a rock pillar system in the replacement of a high-ground-stress soft rock large-deformation ultra-small clear distance tunnel.
Fig. 2 is a schematic plan view of the ultra-small clear distance tunnel according to the present invention.
Fig. 3 is a schematic view of the connection between the prestressed steel pipe and the fastener according to the present invention.
Icon: 1-tunnel repair span; 2, respectively repairing the tunnel; 3-first dividing and repairing the tunnel; 31-first repairing the core soil on the upper part of the tunnel; 31-first upper primary branch; 32-first middle primary branch; 33-first lower primary branch; 4-replacement of the medium pillar structure; 41-prestressed steel pipes; 42-concrete; 43-a fastener; 5-second tunnel maintenance; 51-second upper primary branch; 52-second middle primary branch; 53-second lower primary branch.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Examples
As shown in fig. 1-3, the present embodiment provides a high ground stress soft rock large deformation ultra small clear distance tunnel replacement medium rock pillar structure 4 comprising prestressed connecting pipes, concrete 42 and fasteners 43.
The ultra-small clear distance tunnel comprises a tunnel combined repair long span 1 and a sub-repair tunnel 2, and a rock pillar structure 4 is fixedly arranged in the sub-repair tunnel 2 in replacement.
The number of the prestress connecting pipes is a plurality, specifically, the prestress connecting pipes are prestress steel pipes 41, and the diameter of each prestress connecting pipe is 200 plus 500 mm; prestressed steel pipe 41 intensity is high, and the atress ability is good, can improve the security and the stability of rock pillar structure 4 in the replacement, and a plurality of prestressed steel pipe 41 sets up along vertical direction contact in rows. The prestress can exert pressure on the connecting piece in advance before bearing external load, and the pressure exerted in advance can fully or partially offset the tensile stress caused by the external load when bearing the external load, so that the rock pillar structure 4 in replacement is prevented from being damaged, and the safety and the stability of the rock pillar structure 4 in replacement are improved.
The prestressed steel pipes 41 are provided with a plurality of holes, the concrete 42 is poured inside the prestressed steel pipes 41, the concrete 42 overflows through the holes and is poured in gaps among the plurality of prestressed steel pipes 41, and specifically, the concrete 42 is high-strength concrete. The high-strength concrete has high strength and good stress performance, can improve the stability and the safety of the rock pillar structure 4 in replacement, achieves the purpose of replacing the rock pillar 4 by using the prestressed steel pipe 41 and the concrete 42, avoids the conditions of stress concentration and incapability of self-stabilization in the construction process of the ultra-small clear distance tunnel in the high-ground-stress soft-rock large-deformation zone, ensures the safety and the stability of the construction process of the ultra-small clear distance tunnel in the high-ground-stress soft-rock large-deformation zone, and is convenient to construct.
The fasteners 43 comprise steel tie plates and bolts by which the rock pillar structure 4 is fixedly arranged in the replacement.
The embodiment also provides a rock pillar system in the replacement of the high-ground-stress soft rock large-deformation ultra-small clear distance tunnel, including the above replacement of the rock pillar structure 4 and the sub-repair tunnel 2, the sub-repair tunnel 2 includes a first sub-repair tunnel 3 and a second sub-repair tunnel 5, and the replacement of the rock pillar structure 4 is fixedly arranged between the first sub-repair tunnel 3 and the second sub-repair tunnel 5.
And two ends of the prestressed steel pipe 41 are fixedly connected with the first sub-repair tunnel 3 and the second sub-repair tunnel 5 through steel backing plates and bolts respectively. The steel base plate and the bolts enable the rock pillar structure 4 to be connected with the first sub-repair tunnel 3 and the second sub-repair tunnel 5 into a whole in replacement, the surrounding rock pressure of the high-ground-stress soft rock large-deformation section is jointly borne, and the safety and the stability of the construction process of the ultra-small clear distance tunnel of the high-ground-stress soft rock large-deformation section are guaranteed.
The height of the rock pillar structure 4 in the replacement is less than or equal to the clear distance between the first repair tunnel 3 and the second repair tunnel 5, so that the safety and the stability in the construction process of the ultra-small clear distance tunnel can be guaranteed, the resources and the cost can be saved, the top of the rock pillar structure 4 in the replacement is not more than the joint of the arch part of the repair tunnel 2 and the side wall, and the bottom of the rock pillar structure 4 in the replacement is not more than the side wall corner of the repair tunnel 2. And enough working space is ensured for the rock pillar structure 4 in the replacement in the construction process.
First branch is repaiied tunnel 3 and is equipped with first preliminary bracing, and first preliminary bracing is strutted including first upper portion preliminary 31, first middle part preliminary 32 and first lower part preliminary 33, and first upper portion preliminary 31 sets up on first branch is repaiied tunnel 3 upper portion, and first middle part preliminary 32 sets up in first branch is repaiied tunnel 3 middle part, and first lower part preliminary 33 sets up in first branch is repaiied tunnel 3 lower part. The first primary support is used for supporting and protecting the tunnel in the construction process of the first repair tunnel 3, and the safety and the stability of the tunnel excavation face are ensured.
The outside of second branch tunnel 5 is equipped with the first support and supports, and the first support is supported including first 51, the first 52 in the middle part of second upper portion and the first 53 in the lower part of second, and the first 51 in the upper portion of second branch tunnel 5 sets up in the upper portion of second branch tunnel, and the first 52 in the middle part of second sets up in the middle part of second branch tunnel 5, and the first 53 in the lower part of second sets up in the lower part of second branch tunnel 5. The second primary support is used for supporting and protecting the tunnel in the construction process of the second sub-tunnel 5, and the safety and the stability of the tunnel excavation face are ensured.
The replaced medium-sized rock pillar system can bear the surrounding rock pressure of a high-ground-stress soft rock large-deformation section, and the safety and the stability of the ultra-small clear distance tunnel in the construction process are guaranteed.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The medium-pillar structure (4) for replacing the high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnel is characterized by comprising concrete (42), a fastener (43) and a plurality of prestressed connecting pipes;
one end of each prestress connecting pipe is used for being connected with the first sub-repairing tunnel (3), the other end of each prestress connecting pipe is used for being connected with the second sub-repairing tunnel (5), and the prestress connecting pipes are arranged in a row in a contact mode along the vertical direction;
a plurality of holes are formed in the prestress connecting pipe, and the concrete (42) is poured in the prestress connecting pipe and overflows through the holes to pour gaps among the prestress connecting pipes;
the prestress connecting pipe is connected with the first sub-repairing tunnel (3) through the fastening piece, and the prestress connecting pipe is connected with the second sub-repairing tunnel (5) through the fastening piece.
2. The high-geostress soft rock large-deformation ultra-small-clearance tunnel replacement medium rock pillar structure (4) according to claim 1, characterized in that the prestressed connecting pipe is a prestressed steel pipe (41).
3. The high ground stress soft rock large deformation ultra small clear distance tunnel replacement medium rock pillar structure (4) of claim 1, characterized in that the concrete (42) is high strength concrete.
4. The medium pillar structure (4) of a high geostress soft rock large deformation ultra small clear distance tunnel replacement as claimed in claim 1, characterized in that said fasteners (43) comprise a steel tie plate and bolts, said bolts pass through said steel tie plate, said pre-stressed connecting pipe is connected with said first sub-tunnel (3) through said bolts, said pre-stressed connecting pipe is connected with said second sub-tunnel (5) through said bolts.
5. The medium-distance tunnel replacement rock pillar system for high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnels is characterized by comprising a medium-distance tunnel replacement rock pillar structure (4) as claimed in any one of claims 1-4, and further comprising a sub-repair tunnel (2), wherein the sub-repair tunnel (2) comprises a first sub-repair tunnel (3) and a second sub-repair tunnel (5);
the middle rock pillar structure (4) is fixedly arranged between the first sub-tunnel (3) and the second sub-tunnel (5);
the first sub-repairing tunnel (3) is provided with a first primary support, the second sub-repairing tunnel (5) is provided with a second primary support, and two ends of the prestress connecting pipe are fixedly connected with the first primary support and the second primary support respectively.
6. The high ground stress soft rock large deformation ultra-small clear distance tunnel middle rock pillar system in replacement according to claim 5, characterized in that the length of the middle rock pillar structure (4) in replacement is less than or equal to the clear distance between the first sub-tunnel (3) and the second sub-tunnel (5), and the length of the middle rock pillar structure (4) in replacement is greater than the distance between the first primary support and the second primary support.
7. The high-ground-stress soft-rock large-deformation ultra-small-clear-distance tunnel replacement medium rock pillar system as claimed in claim 6, wherein the top of the replacement medium rock pillar structure (4) is not higher than the junction of the arch part of the partial repair tunnel (2) and a side wall, and the bottom of the replacement medium rock pillar structure (4) is not lower than the side wall corner of the partial repair tunnel (2).
8. The medium rock pillar system for replacing the high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnel according to claim 5, characterized in that the first primary support comprises a first upper primary support (31), a first middle primary support (32) and a first lower primary support (33), the first upper primary support (31) is arranged at the upper part of the first repair tunnel (3), the first middle primary support (32) is arranged at the middle part of the first repair tunnel (3), and the first lower primary support (33) is arranged at the lower part of the first repair tunnel (3).
9. The medium rock pillar system for replacing the high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnel according to claim 5, wherein the second primary support comprises a second upper primary support (51), a second middle primary support (52) and a second lower primary support (53), the second upper primary support (51) is arranged at the upper part of the second repair tunnel (5), the second middle primary support (52) is arranged at the middle part of the second repair tunnel (5), and the second lower primary support (53) is arranged at the lower part of the second repair tunnel (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020538726.1U CN211950516U (en) | 2020-04-13 | 2020-04-13 | Rock pillar structure and system for replacing high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnel |
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| CN202020538726.1U CN211950516U (en) | 2020-04-13 | 2020-04-13 | Rock pillar structure and system for replacing high-ground-stress soft rock large-deformation ultra-small-clear-distance tunnel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464147A (en) * | 2021-07-22 | 2021-10-01 | 中铁五局集团成都工程有限责任公司 | Construction method of soft rock large-span and variable-section tunnel |
| CN114183134A (en) * | 2021-07-07 | 2022-03-15 | 中国石油化工股份有限公司 | Shale gas horizontal well ground stress prediction method and system |
-
2020
- 2020-04-13 CN CN202020538726.1U patent/CN211950516U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183134A (en) * | 2021-07-07 | 2022-03-15 | 中国石油化工股份有限公司 | Shale gas horizontal well ground stress prediction method and system |
| CN114183134B (en) * | 2021-07-07 | 2022-09-13 | 中国石油化工股份有限公司 | Shale gas horizontal well ground stress prediction method and system |
| CN113464147A (en) * | 2021-07-22 | 2021-10-01 | 中铁五局集团成都工程有限责任公司 | Construction method of soft rock large-span and variable-section tunnel |
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