Construction method for replacing middle rock pillar in high ground stress soft rock with large deformation and ultra-small clear distance tunnel
A technology of high ground stress and construction method, applied in tunnels, tunnel linings, earthwork drilling, etc., can solve the problems of tunnel collapse and self-stabilization, achieve good mechanical performance, ensure safety and stability, and operate conveniently and quickly Effect
Active Publication Date: 2021-07-13
CHINA RAILWAY ERYUAN ENG GRP CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to: in the construction process of ultra-small clear distance tunnel in high ground stress soft rock and large deformation section existing in the prior art, the stress concentration and secondary stress field superposition of the middle rock pillar can not be self-stabilized, which can easily cause tunnel occurrence For the problem of collapse accidents, provide a construction method for replacing middle rock pillars in tunnels with high geostress soft rock, large deformation and ultra-small clear distance
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[0034] like figure 1 , Image 6 As shown, this embodiment provides a medium rock pillar structure 4 for replacement of a tunnel in high ground stress soft rock with large deformation and ultra-small clear distance, including prestressed connectors, concrete 42 and fasteners 43 .
[0035] The ultra-small clear distance tunnel includes the long-span section 1 of the combined tunnel repair and the sub-repair tunnel 2, and the replacement middle rock pillar structure 4 is fixedly arranged in the sub-repair tunnel 2.
[0036] The number of prestressed connectors is several, specifically, the prestressed connectors are prestressed steel pipes 41; the prestressed steel pipes 41 have high strength and good force bearing capacity, which can improve the safety and stability of the rock pillar structure 4 in the replacement, Several prestressed steel pipes 41 are vertically arranged in a row in contact with each other. Prestressing can apply pressure to the connector in advance before ...
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The invention discloses a construction method for replacing middle rock pillars in parallel tunnels with large deformation and ultra-small clear distance in high ground stress soft rock, including S1: excavating the first sub-repair tunnel steps; S2: excavating the second sub-repair tunnel upper steps and middle steps; S3: Insert the prestressed steel pipe in the direction of the side wall of the first sub-repair tunnel to the second sub-repair tunnel, one end of the pre-stressed steel pipe is fixed and locked with the first initial support, and the other end of the pre-stressed steel pipe is connected to the second sub-repair tunnel. The second primary branch of the tunnel is fixed and locked, and concrete is pressed into the prestressed steel pipe at the side wall of the step in the second sub-repair tunnel; S4: excavate the second sub-repair tunnel and go down the steps; S5: in the first sub-repair tunnel The side wall of the lower step penetrates the prestressed steel pipe towards the direction of the second sub-repair tunnel, one end of the pre-stressed steel pipe is fixed with the first initial support, and the other end of the pre-stressed steel pipe is fixed with the second initial support of the second sub-repair tunnel. Tighten, and press concrete into the end of the prestressed steel pipe at the inverted arch of the second sub-repair tunnel. The above construction method can effectively realize the function of replacing the middle rock column structure, and the operation is convenient and quick.
Description
technical field [0001] The invention relates to the field of railway tunnels, in particular to a construction method for replacing middle rock pillars in tunnels with high ground stress, soft rock, large deformation and ultra-small clear distance. Background technique [0002] According to the number of main lines, railway projects can be divided into single-track railways and double-track railways. The plane layout of double-track railways in tunnels is usually combined into one double-track tunnel, or divided into two single-track tunnels. However, due to various reasons, sometimes it is necessary to change from one double-line tunnel to two single-line tunnels in the tunnel, and it is necessary to set up a large-span section for joint repair and a small clear distance section for separate repair in the tunnel. At present, in the railway tunnels under construction or put into operation, the transition section of joint and separate repairs is generally selected in the secti...
Claims
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IPC IPC(8): E21D11/10E21D9/14E21D11/00E21D11/14
CPCE21D9/14E21D11/003E21D11/10E21D11/14
Inventor 陈锡武周跃峰吴华邸成张磊姜波王若晨龙杰殷召念郑杰元罗永刚张涛
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD