CN211573529U - Large karst cavity rock fall prevention elastic tunnel structure - Google Patents
Large karst cavity rock fall prevention elastic tunnel structure Download PDFInfo
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- CN211573529U CN211573529U CN201922426537.5U CN201922426537U CN211573529U CN 211573529 U CN211573529 U CN 211573529U CN 201922426537 U CN201922426537 U CN 201922426537U CN 211573529 U CN211573529 U CN 211573529U
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Abstract
An elastic tunnel structure for preventing large karst cavities from falling rocks is used for solving the problems of safety and economy of the tunnel structure in the large karst cavities. The tunnel structure adopts reinforced concrete monolithic to pour, and the bottom is located on the tunnel basis that is located on the stable rock foundation, sets up the atress pier stud along the vertical interval symmetry of circuit outside the horizontal both sides of tunnel structure on the tunnel basis. The top end of the stress pier stud is 2-3m higher than the top of the tunnel structure, and a rubber pad is fixedly arranged. The bearing plate longitudinally extending along the line is arranged above the tunnel structure, the two transverse ends of the bearing plate are located on the rubber pads, and the bearing plate is connected with the same-side stressed pier stud through the fixed anchor cables penetrating through the rubber pads. The top surface of the bearing plate is provided with an upper elastic structure, the top end of the elastic structure is provided with an anti-impact plate, and the top surface of the anti-impact plate is fixedly provided with a buffer body; and the outside of the two transverse sides of the tunnel structure is filled with tunnel waste to form a back pressure body.
Description
Technical Field
The utility model relates to geotechnical engineering, in particular to large-scale karst cavity rock fall prevention elasticity tunnel structure.
Background
The karst landform distribution of China is wide, karst cavities formed by soluble rocks in karst regions are uncertain and are usually difficult to accurately detect, the karst cavities are quite common for tunnel engineering when the karst cavities pass through the soluble rocks, concrete is usually adopted for filling the cavities if the karst cavities are small, when the karst cavities are large, the concrete is very uneconomical when the karst cavities are all filled, and if the karst cavities are not all filled, rock falling at the tops of the karst cavities can cause hidden danger to the safety of a tunnel structure, so that the large karst cavity rock falling-proof elastic tunnel structure and the construction method have important significance, and the large karst cavity rock falling-proof elastic tunnel structure and the construction method have the characteristics of good rock falling impact resistance effect, convenience in construction, economy, environmental protection, popularization and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a large-scale karst cavity rock fall prevention elasticity tunnel structure is provided to solve the safety and the economic nature problem of tunnel structure in the large-scale karst cavity, effectively resist the rock fall impact force at karst cavity top, ensure tunnel structure and circuit operation safety.
The utility model provides a technical scheme as follows that above-mentioned technical problem took:
the utility model discloses a large-scale karst cavity rock fall prevention elasticity tunnel structure, including passing through large-scale karst cavity tunnel structure, characterized by: the tunnel structure is integrally cast by adopting reinforced concrete, the bottom of the tunnel structure is located on a tunnel foundation above a stable rock foundation, and stressed pier studs are longitudinally and symmetrically arranged on the tunnel foundation at intervals along lines outside the two transverse sides of the tunnel structure; the top end of the stressed pier stud is 2-3m higher than the top of the tunnel structure, and a rubber pad is fixedly arranged; a bearing plate longitudinally extending along the line is arranged above the tunnel structure, and two transverse ends of the bearing plate are located on the rubber pads and are connected with the stressed pier columns on the same side through fixed anchor cables penetrating through the rubber pads; the top surface of the bearing plate is provided with an upper elastic structure, the top end of the elastic structure is provided with an anti-impact plate, and the top surface of the anti-impact plate is fixedly provided with a buffer body; and the outside of the two transverse sides of the tunnel structure is filled with tunnel waste to form a back pressure body.
And a lower elastic structure is arranged between the top of the tunnel structure and the bearing plate.
The utility model has the advantages that the bearing plate, the elastic structure, the anti-impact plate and the waste tire are arranged above the top of the tunnel structure to form a large-deformation elastic high-strength anti-impact combined structure for resisting the rock falling impact force at the top of the karst cavity; the impact force is mainly transmitted to the stressed pier stud, so that the influence on the tunnel structure is avoided; a rubber pad is arranged between the bearing plate and the stressed pier stud, so that the anti-cutting effect of the bearing plate is greatly relieved; a large enough suspension distance is reserved between the bearing plate and the top of the tunnel structure, and a lower elastic structure is arranged, so that the bearing plate stress can be improved, the engineering investment can be saved, and a large enough deformation space is reserved; the arrangement of the back pressure body ensures the transverse stability of the tunnel structure and greatly relieves the impact of the falling rocks at the top to the two sides of the tunnel structure; the structure solves the problems of safety and economy of the tunnel structure in the large karst cavity, effectively resists the rockfall impact force at the top of the karst cavity and ensures the safety of the tunnel structure and the line operation.
Drawings
The specification includes the following figures:
FIG. 1 is a schematic cross-sectional view of a large karst cavity anti-rockfall elastic tunnel structure of the present invention;
the component names and corresponding labels are shown in the figure: the device comprises a tunnel structure 1, a tunnel foundation 2, a stressed pier stud 3, a rubber pad 4, a fixed anchor cable 5, a bearing plate 6, an upper elastic structure 7a, a lower elastic structure 7B, an anti-impact plate 8, a buffer body 9, a counter pressure body 10, a karst cavity boundary A and a ground line B.
Detailed Description
The invention is further described with reference to the following figures and examples:
referring to fig. 1, the utility model discloses a large-scale karst cavity rock fall prevention elasticity tunnel structure is including passing through large-scale karst cavity tunnel structure 1, tunnel structure 1 adopts reinforced concrete monolithic pouring, and the bottom is located on being located the tunnel basis 2 on stabilizing rock foundation, sets up atress pier stud 3 along the vertical interval symmetry of circuit outside the 1 horizontal both sides of tunnel structure on tunnel basis 2. The top end of the stress pier stud 3 is 2-3m higher than the top of the tunnel structure 1, and a rubber pad 4 is fixedly installed. The tunnel structure 1 is provided with a bearing plate 6 extending longitudinally along the line, and the two transverse ends of the bearing plate 6 are located on the rubber pads 4 and are connected with the stressed pier studs 3 on the same side through fixed anchor cables 5 penetrating through the rubber pads 4. An upper elastic structure 7a is arranged on the top surface of the bearing plate 6, an anti-impact plate 8 is arranged at the top end of the elastic structure 7a, and a buffer body 9 is fixedly arranged on the top surface of the anti-impact plate 8. The tunnel structure 1 is filled with tunnel waste outside the two transverse sides to form counter pressure bodies 10. A lower elastic structure 7b is arranged between the top of the tunnel structure 1 and the bearing plate 6.
The utility model discloses a set up loading board 6, upper portion elastic construction 7a, anti dash board 8 and buffer 9 and constitute big deformation elasticity high strength composite construction that shocks resistance more than tunnel structure 1 top for resist the rockfall impact force at karst cavity top. The impact force is mainly transmitted to the stressed pier stud 3, and the influence on the tunnel structure 1 is avoided. A rubber pad 4 is arranged between the bearing plate 6 and the stressed pier column 7, and a lower elastic structure 7b is arranged between the bearing plate and the top of the tunnel structure 1, so that the anti-cutting effect of the bearing plate 6 and the adverse stress form of large suspension in the middle are greatly relieved, the bearing plate stress is effectively improved, and the engineering investment is saved; the arrangement of the counter-pressure body 10 ensures the lateral stability of the tunnel structure 1 and greatly relieves the impact of the falling rocks at the top on both sides of the tunnel structure 1. The problem of the safety and the economic nature of tunnel structure in the large-scale karst cavity is solved, effectively resist the rock fall impact force at karst cavity top, ensure tunnel structure and circuit operation safety.
The stress of the bearing plate 6 and the impact-resistant plate 8 can be estimated by the maximum dangerous rock impact force at the top of the karst cavity, and the energy dissipation effect of the upper elastic structure 7a and the lower elastic structure 7b is considered for reduction.
Referring to fig. 1, as a preferred embodiment, the upper elastic structure 7a adopts a row of high elastic modulus compression springs arranged in a row at intervals along the longitudinal direction of the line and a row at intervals along the transverse direction of the line, and the lower elastic structure 7b adopts a row of high elastic modulus compression springs arranged at intervals along the longitudinal direction of the line, and the height of the row is not less than 1 m. The section of the anti-impact plate 8 is in a herringbone shape. The tunnel foundation 2 is formed by pouring concrete or building mortar rubble. The buffer body 9 is a waste tire bound on the top surface of the impact-resistant plate 8. The counterpressure body 10 is arranged at a height which generally corresponds to the height of the roof of the tunnel structure 1.
Referring to fig. 1, the utility model relates to a large-scale karst cavity rock fall prevention elasticity tunnel structure builds according to following step:
clearing loose soil and stones at corresponding positions at the bottom of the tunnel structure 1 until a foundation rock surface is stabilized;
constructing a tunnel foundation 2;
thirdly, after the tunnel foundation 2 reaches 80% of the design strength, constructing the reinforced concrete of the tunnel structure 1;
fourthly, constructing the stressed pier stud 3 by using reinforced concrete, and embedding and connecting the lower part of the fixed anchor cable 5 in the center of the top of the stressed pier stud 3;
installing a rubber pad 4 on the top of the stress pier stud 3, and fixing the anchor cable 5 to penetrate through the rubber pad 4;
sixthly, binding a reinforcement cage of the bearing plate 6 on the top of the rubber gasket 4, fixedly connecting a main reinforcement with the upper part of the fixed anchor cable 5 in a light tensioning manner, embedding connecting reinforcements at positions where an upper elastic structure 7a and a lower elastic structure 7b are correspondingly arranged on the top and the center of the bearing plate 6, and pouring concrete of the bearing plate 6;
seventhly, installing an upper elastic structure 7a and a lower elastic structure 7b, and connecting the upper elastic structure and the lower elastic structure with the embedded connecting steel bars;
installing and fixing an impact resistance 8 on the top of the upper elastic structure 7 a;
ninthly, fixedly installing a buffer body 9 on the top of the impact-resistant plate 8;
and filling the reverse pressure body 10 in the middle part of the red part by adopting the tunnel waste in a layered and symmetrical mode.
The construction method is simple, can quickly and economically realize the construction of the karst cavity elastic tunnel structure, and has the characteristics of safety, convenience, environmental protection, contribution to popularization and the like.
The above is only used for illustrating the present invention, and the present invention is not limited to the specific structure and the application range of the construction method, so all the corresponding modifications and equivalents that may be utilized belong to the claimed patent scope.
Claims (7)
1. The utility model provides a large-scale karst cavity rock fall prevention elasticity tunnel structure, is including passing through large-scale karst cavity's tunnel structure (1), characterized by: the tunnel structure (1) is integrally cast by adopting reinforced concrete, the bottom of the tunnel structure is located on a tunnel foundation (2) above a stable rock foundation, and stress pier studs (3) are longitudinally and symmetrically arranged on the tunnel foundation (2) at intervals along the line on the outer sides of the transverse direction of the tunnel structure (1); the top end of the stressed pier stud (3) is 2-3m higher than the top of the tunnel structure (1), and a rubber pad (4) is fixedly installed; a bearing plate (6) extending longitudinally along the line is arranged above the tunnel structure (1), two transverse ends of the bearing plate (6) are located on the rubber pads (4), and the bearing plate is connected with the stressed pier columns (3) on the same side through fixed anchor cables (5) penetrating through the rubber pads (4); an upper elastic structure (7a) is arranged on the top surface of the bearing plate (6), an anti-impact plate (8) is arranged at the top end of the elastic structure (7), and a buffer body (9) is fixedly arranged on the top surface of the anti-impact plate (8); and the tunnel structure (1) is externally filled with tunnel waste on the two transverse sides to form a back pressure body (10).
2. The large karst cavity rockfall prevention elastic tunnel structure of claim 1, wherein: and a lower elastic structure (7b) is arranged between the top of the tunnel structure (1) and the bearing plate (6).
3. A large karst void rockfall prevention elastic tunnel structure as claimed in claim 1 or 2, wherein: the upper elastic structure (7a) is a high-elastic modulus compression spring which is arranged in a row at intervals along the longitudinal direction of the line and in a row at intervals along the transverse direction of the line, and the lower elastic structure (7b) is a row of high-elastic modulus compression springs which are arranged at intervals along the longitudinal direction of the line and have the height not less than 1 m.
4. The large karst cavity rockfall prevention elastic tunnel structure of claim 1, wherein: the section of the anti-impact plate (8) is in a herringbone shape.
5. The large karst cavity rockfall prevention elastic tunnel structure of claim 1, wherein: the tunnel foundation (2) is formed by pouring concrete or building mortar rubble.
6. The large karst cavity rockfall prevention elastic tunnel structure of claim 1, wherein: the buffer body (9) is a waste tire bound on the top surface of the anti-impact plate (8).
7. The large karst cavity rockfall prevention elastic tunnel structure of claim 1, wherein: the set height of the back pressure body (10) is consistent with the top elevation of the tunnel structure (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922426537.5U CN211573529U (en) | 2019-12-29 | 2019-12-29 | Large karst cavity rock fall prevention elastic tunnel structure |
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| CN201922426537.5U CN211573529U (en) | 2019-12-29 | 2019-12-29 | Large karst cavity rock fall prevention elastic tunnel structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111101966A (en) * | 2019-12-29 | 2020-05-05 | 中铁二院工程集团有限责任公司 | Large karst cavity rockfall-preventing elastic tunnel structure and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111101966A (en) * | 2019-12-29 | 2020-05-05 | 中铁二院工程集团有限责任公司 | Large karst cavity rockfall-preventing elastic tunnel structure and construction method |
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