CN211645934U - Deep-buried karst cave treatment structure under tunnel bottom plate - Google Patents
Deep-buried karst cave treatment structure under tunnel bottom plate Download PDFInfo
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- CN211645934U CN211645934U CN201922278176.4U CN201922278176U CN211645934U CN 211645934 U CN211645934 U CN 211645934U CN 201922278176 U CN201922278176 U CN 201922278176U CN 211645934 U CN211645934 U CN 211645934U
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Abstract
The utility model relates to a deep-buried karst cave treatment structure under a tunnel bottom plate, which comprises a pile foundation joist bridge crossing structure, a hoop support type bent cap formwork supporting system and a support type box girder formwork supporting system; the pile foundation joist bridge spanning structure comprises a box girder, a cover girder, a bearing platform, piles and a tunnel bottom plate, wherein the piles are driven in the karst cave, the piles vertically penetrate through the karst cave, the cover girder is poured at the top of the piles below the side walls of the tunnel, the bearing platform is arranged at the top of the piles below the tunnel bottom plate, and the box girder is poured on the bearing platform; the hoop supporting type cover beam formwork system comprises a hoop, an inclined stay bar, a cover beam pile interval bottom formwork and a cover beam side formwork, wherein the cover beam pile interval bottom formwork and the cover beam side formwork are assembled together, and the inclined stay bar with a telescopic jacking support supports the cover beam pile interval bottom formwork. The utility model has the advantages that: the utility model provides a scalable top at diagonal brace top holds in the palm can be through the length of flexible regulation diagonal brace, and the better atress of the template of being convenient for reduces the template atress deformation when concreting, and technical benefit is showing.
Description
Technical Field
The utility model relates to a tunnel engineering field, in particular to bury solution cavity punishment structure deeply under tunnel bottom plate.
Background
The karst geology of China is mainly and intensively distributed in parts of areas such as the cloud, the noble, the three-province, the Shuangguang and the two lakes, and the like, along with the rapid development of the economy of China and the deep implementation of the western major development strategy, the construction strength of the infrastructure of the areas is continuously increased, and the continuous planning construction of large-scale highway and railway engineering needs to deal with a large number of engineering problems caused by the karst geology, particularly the karst tunnel engineering problem. Due to the improvement of the design standard of the railway, the large and deep buried karst tunnel is inevitably generated due to the limitation of the longitudinal slope and the curve radius of the line. Meanwhile, due to the limitation of a survey technical means and a survey period and the irregularity of karst development, the concrete karst forms of the tunnel passing through the section are difficult to be completely found in a survey design stage, and the karst probability of different forms and different damages is extremely high in the tunnel construction process, so that a deep-buried karst cave is formed below a tunnel bottom plate in the karst tunnel construction process, how to treat the deep-buried karst cave is realized, and the construction quality and the operation safety are guaranteed to be very important. At present, no relevant patent is available on how to treat the deep-buried karst cave under the tunnel floor.
Therefore, at present, a deep-buried karst cave under a tunnel bottom plate which can be effectively treated and is rapid in construction and high in stability is needed to be found, and the structure is very important.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough among the prior art, provide a bury solution cavity punishment structure deeply under tunnel bottom plate.
The treatment structure for the deep-buried karst cave under the tunnel bottom plate comprises a pile foundation joist bridge spanning structure, a hoop support supporting type bent cap formwork supporting system and a support supporting type box girder formwork supporting system; the pile foundation joist bridge spanning structure comprises a box girder, a cover girder, a bearing platform, piles and a tunnel bottom plate, wherein the piles are driven in the karst cave, the piles vertically penetrate through the karst cave, the cover girder is poured at the top of the piles below the side walls of the tunnel, the bearing platform is arranged at the top of the piles below the tunnel bottom plate, and the box girder is poured on the bearing platform; the hoop supporting type bent cap formwork system comprises a hoop, an inclined stay bar, a bent cap pile interval bottom formwork and a bent cap side formwork, wherein the bent cap pile interval bottom formwork and the bent cap side formwork are assembled together; the supporting type box girder formwork system comprises a box girder formwork and a formwork supporting structure, wherein the box girder formwork comprises a box girder side formwork, a box girder flange formwork and a box girder middle formwork, a formwork supporting structure consisting of upright rods, horizontal rods and inclined supporting rods is erected on a bearing platform, the box girder side formwork is fixed on the horizontal rods, and the box girder flange formwork is supported by the inclined supporting rods; the bottom of the karst cave is filled with grouting within a certain height range.
Preferably, the method comprises the following steps: the joists in the pile foundation joist bridge spanning structure are box girders and cover girders.
The utility model has the advantages that:
(1) the utility model provides a scalable top at diagonal brace top holds in the palm can be through the length of flexible regulation diagonal brace, and the better atress of the template of being convenient for reduces the template atress deformation when concreting, and technical benefit is showing.
(2) The utility model provides a staple bolt supports a formula bent cap formwork system construction is simple, the atress is good, stability is high, has good technical benefit.
(3) The utility model discloses a stability of solution cavity bottom can be improved in controllability slip casting packing, is in the same place the better combination of rock mass of pile foundation and solution cavity bottom, improves the bearing capacity of pile foundation.
Drawings
FIG. 1 is a schematic view of a bridge span structure of a pile foundation joist;
FIG. 2 is a schematic longitudinal section of the left side wall of the tunnel;
FIG. 3 is a schematic view of a hoop supported bent cap formwork system;
fig. 4 is a schematic view of a support box girder formwork system.
Description of reference numerals: 1-box girder; 2-a capping beam; 3, bearing platform; 4, piling; 5-tunnel midline; 6, tunnel bottom plate; 7-empty karst cave; 8-bolt and nut; 9-grouting and filling; 10-karst cave outline; 11-tunnel section at upper part of karst cave; 12, hooping; 13-diagonal brace; 14, a telescopic jacking; 15-a bottom template of the capping beam pile interval section; 16-capping beam sideform; 17-a box girder middle template; 18-box beam flange formwork; 19-box beam sideform; 20-erecting a pole; 21-horizontal bar.
Detailed Description
The present invention will be further described with reference to the following examples. The following description of the embodiments is merely provided to aid in understanding the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
The deep-buried karst cave treatment structure under the tunnel bottom plate comprises a pile foundation joist bridge spanning structure, a hoop support type bent cap formwork supporting system and a support type box girder formwork supporting system; the spanning structure of the pile foundation joist bridge comprises a box girder 1, a cover beam 2, a bearing platform 3, piles 4 and a tunnel bottom plate 6, wherein the piles 4 are driven in a karst cave, the piles 4 vertically penetrate through the karst cave, the cover beam 2 is poured at the tops of the piles 4 below the side walls of the tunnel, the bearing platform 3 is arranged at the tops of the piles 4 below the tunnel bottom plate 6, the box girder 1 is poured on the bearing platform 3, and the load of the tunnel is transmitted to a rock mass at the bottom of the karst cave through a pile foundation; the hoop supporting type bent cap formwork system comprises a hoop 12, an inclined stay bar 13, a bent cap pile interval section bottom formwork 15 and a bent cap side formwork 16, the bent cap pile interval section bottom formwork 15 and the bent cap side formwork 16 are assembled together, the inclined stay bar 13 with a telescopic jacking 14 supports the bent cap pile interval section bottom formwork 15, and the lower end of the inclined stay bar 13 is fixed on a pile 4 through the hoop 12, a bolt and a nut 8; the supporting type box girder formwork system comprises a box girder formwork and a formwork supporting structure, the box girder formwork comprises a box girder side formwork 19, a box girder flange formwork 18 and a box girder middle formwork 17, a formwork supporting structure consisting of upright rods 20, horizontal rods 21 and inclined supporting rods 13 is erected on the bearing platform 3, the box girder side formwork 19 is fixed on the horizontal rods 21, the box girder flange formwork 18 is supported by the inclined supporting rods 13, the length of the inclined supporting rods 13 can be adjusted by telescopic jacking supports 14 on the inclined supporting rods 13, the box girder flange formwork 18 is supported more stably, and deformation of the box girder flange formwork 18 is controlled; grouting and filling are carried out within a certain height range at the bottom of the karst cave, so that a rock body at the bottom of the karst cave is combined with the pile body, and the stability of the pile foundation is improved.
The joists in the bridge spanning structure of the pile foundation joist are a box girder 1 and a cover girder 2.
The bearing platform 3 can be cast in place or prefabricated in a factory and then transported to the site for assembly.
The construction method of the deep-buried karst cave treatment structure under the tunnel bottom plate comprises the following steps:
(1) and constructing a pile foundation. The piles 4 are driven into the rock mass at the bottom of the cavern as shown in figures 1 and 2.
(2) And grouting the bottom of the karst cave. And (3) performing controlled grouting and filling at the bottom of the karst cave to combine the rock mass at the bottom of the karst cave with the pile body, as shown in figures 1 and 2.
(3) And constructing a bent cap formwork system. Assembling a bottom template 15 and a side template 16 of the capping beam pile interval, supporting the bottom template 15 of the capping beam pile interval through an inclined strut 13 with a telescopic jacking 14, and fixing the lower end of the inclined strut 13 on the pile 4 by using a hoop 12, a bolt and a nut 8, as shown in fig. 3.
(4) And constructing a box girder formwork system. A formwork supporting structure consisting of upright rods 20, horizontal rods 21 and diagonal braces 13 is erected on the bearing platform 3, box girder formworks are assembled, box girder side formworks 19 are fixed on the horizontal rods 21, and box girder flange formworks 18 are supported by the diagonal braces 13, as shown in fig. 4.
(5) And pouring the cover beam box girder. And pouring concrete in the erected capping beam and box beam templates, vibrating and forming, and removing the templates after the strength of the concrete meets the requirement.
(6) And constructing a tunnel bottom plate. And pouring a tunnel bottom plate 6 on the cover beam 2 and the box beam 1 as shown in figure 1.
Claims (2)
1. Bury solution cavity punishment structure deeply under tunnel bottom plate, its characterized in that: the pile foundation joist bridge span structure comprises a pile foundation joist bridge span structure, an anchor ear supporting type bent cap formwork system and a supporting type box girder formwork system; the bridge crossing structure of the pile foundation joist comprises a box girder (1), a cover girder (2), a bearing platform (3), piles (4) and a tunnel bottom plate (6), wherein the piles (4) are driven in a karst cave, the piles (4) vertically penetrate through the karst cave, the cover girder (2) is poured on the tops of the piles (4) below the side walls of the tunnel, the bearing platform (3) is arranged on the tops of the piles (4) below the tunnel bottom plate (6), and the box girder (1) is poured on the bearing platform (3); the hoop supporting type bent cap formwork system comprises a hoop (12), an inclined stay bar (13), a bent cap pile section bottom formwork (15) and a bent cap side formwork (16), the bent cap pile section bottom formwork (15) and the bent cap side formwork (16) are assembled together, the inclined stay bar (13) with a telescopic jacking support (14) supports the bent cap pile section bottom formwork (15), and the lower end of the inclined stay bar (13) is fixed on a pile (4) through the hoop (12) and a bolt and a nut (8); the supporting type box girder formwork system comprises a box girder formwork and a formwork supporting structure, the box girder formwork comprises a box girder side formwork (19), a box girder flange formwork (18) and a box girder middle formwork (17), the formwork supporting structure consisting of upright rods (20), horizontal rods (21) and diagonal braces (13) is erected on the bearing platform (3), the box girder side formwork (19) is fixed on the horizontal rods (21), and the box girder flange formwork (18) is supported by the diagonal braces (13); the bottom of the karst cave is filled with grouting (9) within a certain height range.
2. The structure of claim 1, wherein the bottom plate of the tunnel is provided with a deep-buried cavern, and the structure comprises: the joists in the pile foundation joist bridge spanning structure are a box girder (1) and a cover girder (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922278176.4U CN211645934U (en) | 2019-12-18 | 2019-12-18 | Deep-buried karst cave treatment structure under tunnel bottom plate |
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| CN201922278176.4U CN211645934U (en) | 2019-12-18 | 2019-12-18 | Deep-buried karst cave treatment structure under tunnel bottom plate |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112727495A (en) * | 2021-01-29 | 2021-04-30 | 中铁二院工程集团有限责任公司 | Bracing structure for controlling deformation of bottom of tunnel |
| CN113324454A (en) * | 2021-07-09 | 2021-08-31 | 广东中人岩土工程有限公司 | Karst geological foundation pit blasting construction device and process thereof |
| CN114232666A (en) * | 2021-06-16 | 2022-03-25 | 广西交通设计集团有限公司 | Multi-span prestressed elastic foundation beam structure for spanning complex karst cave group and construction method |
-
2019
- 2019-12-18 CN CN201922278176.4U patent/CN211645934U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112727495A (en) * | 2021-01-29 | 2021-04-30 | 中铁二院工程集团有限责任公司 | Bracing structure for controlling deformation of bottom of tunnel |
| CN112727495B (en) * | 2021-01-29 | 2022-08-26 | 中铁二院工程集团有限责任公司 | Bracing structure for controlling deformation of bottom of tunnel |
| CN114232666A (en) * | 2021-06-16 | 2022-03-25 | 广西交通设计集团有限公司 | Multi-span prestressed elastic foundation beam structure for spanning complex karst cave group and construction method |
| CN113324454A (en) * | 2021-07-09 | 2021-08-31 | 广东中人岩土工程有限公司 | Karst geological foundation pit blasting construction device and process thereof |
| CN113324454B (en) * | 2021-07-09 | 2022-09-02 | 广东中人岩土工程有限公司 | Karst geological foundation pit blasting construction device and process thereof |
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