In-tunnel reverse construction method for mined metro station with oversized cross section based on arch cover method in soft rock area

A technology of super large section and reverse method, applied in underground chambers, shaft linings, tunnel linings, etc., can solve the problems of high investment, long construction period, and many temporary supports, so as to ensure stability, strengthen bearing capacity, and improve construction operations. The effect of the environment

Active Publication Date: 2020-01-31
JIESHUN RAIL TRAFFIC TECH CHONGQING
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In areas with soft rocks, underground excavation and large-section subway stations are usually constructed using the double-side-wall pilot pit method. The construction steps are complicated, there are many temporary supports, and the construction efficiency is low. Although the technology is mature, the investment is high and the construction period is long.

Method used

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  • In-tunnel reverse construction method for mined metro station with oversized cross section based on arch cover method in soft rock area
  • In-tunnel reverse construction method for mined metro station with oversized cross section based on arch cover method in soft rock area
  • In-tunnel reverse construction method for mined metro station with oversized cross section based on arch cover method in soft rock area

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Embodiment 1

[0039] Example 1, please refer to Figure 1~15 , the present invention provides a kind of inversion method in soft rock area based on the arch cover method in super large cross-section underground excavation station tunnel, comprising the following steps: Step S01, arch excavation and arch foot arch cover construction; during tunnel excavation, It is necessary to complete the excavation of the upper arch first, and complete the construction of the arch cover of the arch foot. The excavation of the arch is excavated by the double side wall pilot pit method. The excavation sequence is as follows: figure 2 As shown, pilot holes are excavated on the left and right sides of the upper part; image 3 As shown, the pilot tunnels are excavated on the left and right sides of the upper part; Figure 4 As shown, the upper, middle and upper pilot pits are excavated; Figure 5 As shown, the upper, middle and lower pilot pits are excavated; Image 6 As shown, the upper waterproof layer i...

Embodiment 2

[0053] Embodiment 2, the present invention also provides a kind of top-down method in the large-section underground excavation station hole based on the arch cover method in the soft rock area. The middle and lower part of the section is vertically divided into two layers according to the length of the station. From top to bottom are the top layer and the bottom layer, and the excavation area of ​​each layer includes the middle hopping area and the two side areas for excavation. The specific excavation method can be found in Example 1; the implementation method is as follows:

[0054] Step S01, arch excavation and arch foot arch cover construction;

[0055] Step S1, complete the excavation of the excavation area of ​​the top layer, and the excavation of the job-hopping area in the middle of the bottom layer; the height ratio of the top layer and the bottom layer is 4:6;

[0056] Step S2, carry out the construction of the local inverted arch, side wall and station hall laminate...

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Abstract

The invention provides an in-tunnel reverse construction method for a mined metro station with an oversized cross section based on an arch cover method in a soft rock area. The method comprises the following steps of S1, excavating excavated areas in a top layer and a middle layer and excavating a slot jumping area in the middle of a bottom layer; S2, carrying out construction of a local invertedarch, a second section side wall and a negative second floor driving plate structure of the station; and S3, finishing full-cross section excavation and constructing a second liner to line residual parts and the negative second floor driving plate structure of the station. The arch cover method is applied to the soft rock area effectively by means of a supporting measure combining permanent and temporary structures and a reinforcing measure of a special part and combining the in-tunnel reverse construction method of the mined tunnel. Excavation on the lower part in the cross section of the tunnel is carried out by middle broaching, and separated areas on two sides are excavated, so that construction organization in an in-tunnel three-dimensional space is achieved. Compared with a conventional tunnel face-based excavation mode, a sufficient operating space is provided for construction.

Description

technical field [0001] The invention relates to the technical field of underground construction engineering, in particular to a top-down method in a soft rock area based on an arch-covering method in a super-large cross-section underground excavation station cave. Background technique [0002] In areas with soft rocks, underground excavation and large-section subway stations are mostly constructed using the double-side-wall pilot pit method. The construction steps are complicated, there are many temporary supports, and the construction efficiency is low. Although the technology is mature, the investment is high and the construction period is long. [0003] The arch-covering method can also be used for underground excavation of large-section stations, but the traditional arch-covering method is generally applied to relatively hard rock or hard rock strata with high compressive strength, mainly utilizing the good self-stabilization ability of the side wall rock strata. In rail...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D13/02E21D11/10E21F16/00
CPCE21D13/00E21D11/10E21F16/00
Inventor 邹光炯彭辉吴天张荣周捷马强方胜孙伟刘佳月
Owner JIESHUN RAIL TRAFFIC TECH CHONGQING
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