Construction method for soft rock deformation tunnel lining support dismantling-replacing arch

A construction method and lining technology, which is applied in the direction of tunnel lining, tunnel lining, shaft lining, etc., can solve problems such as unsafe construction, and achieve the effects of large construction space, saving construction period, and strong operability

Inactive Publication Date: 2016-07-20
CCCC SECOND HIGHWAY ENG CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that the existing method cannot dismantle and replace the lining and support of the entire section at one time, and the construction is unsafe, the present invention provides a construction method for the lining support and arch replacement of soft rock deformed tunnels. The present invention does not set a platform for reinforcing the lining The construction space is large, which is conducive to the rapid construction of mechanization. The original bearing capacity, integrity, erosion and waterproof and anti-seepage performance of the tunnel lining structure are guaranteed through the dismantling and replacement construction; the construction workers can effectively Safe operation under protection can effectively avoid and reduce the risk of top falling blocks or landslides during the removal of the initial support, shorten the operation cycle time, and gradually advance the operation in depth, speed up the construction progress and effectively save the construction period

Method used

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  • Construction method for soft rock deformation tunnel lining support dismantling-replacing arch
  • Construction method for soft rock deformation tunnel lining support dismantling-replacing arch

Examples

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Embodiment 1

[0040] In order to overcome the problem that the existing method cannot dismantle and replace the lining support of the whole section at one time, and the construction is unsafe, the present invention provides such figure 1 , figure 2 Shown is a construction method for removing and replacing arches for the lining support of soft rock deformation tunnels. The present invention does not set a pedestal for reinforcing the lining, but adopts temporary arches, which has a large construction space and is conducive to rapid mechanized construction. The original bearing capacity, integrity, erosion and waterproof and anti-seepage properties of the lining structure; construction workers can work safely under effective protection, which can effectively avoid and reduce the risk of top falling blocks or landslides during the removal of the initial support Danger, shorten the operation cycle time, and gradually advance the operation in depth, which speeds up the construction progress and...

Embodiment 2

[0063] On the basis of Example 1, in the third step in this example, before removing the primary support to be replaced, the arch wall is reinforced by radial drilling and grouting on the lining surface with a φ42 small conduit. The length of the small conduit is 5.5m , spacing 1.5m×1.5m, quincunx layout, grouting pressure 1.0MPa-3MPa, design grouting amount per linear meter is 3.5m 3 ;Use φ89 steel pipes on the top surface of the inverted arch filling to carry out vertical drilling and grouting reinforcement on the base of the inverted arch. The length of the steel pipes is 5.2-6.5m, and the spacing is 1.5m×1.5m. Eyes, the diameter of the eye hole is 10-16 mm, and the length of the tail is not less than 100 cm without drilling.

[0064] Use section steel to carry out arch reinforcement work for the second lining to be removed. Before demolition, temporary arch reinforcement should be erected on the arch wall. The arch is made of I-20b section steel with a spacing of 1 榀 / 0.6m....

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Abstract

The invention provides a construction method for a soft rock deformation tunnel lining support dismantling-replacing arch. One-time whole section integral dismantling and replacing of a lining support is achieved. The construction method has the advantages that before dismantling and replacing, a lining which loses bearing capacity is subjected to grouting reinforcement treatment first, then a temporary cover arch is additionally arranged outside for reinforcement, and afterwards, the lining support is dismantled step by step, so that potential safety hazards caused by dismantling or removing of a temporary platform frame are avoided, and some security risks are avoided effectively. According to the construction method, the construction difficult problem of soft rock large deformation occurs during construction of a tunnel in special and complex geology is solved. Through the created novel construction method, the construction difficult problem of second lining cracking deformation needing remediation due to weak surrounding rock large deformation is solved. Through the construction method, safe, fast and economic treatment and remediation of the lining support and arch replacing construction are achieved, and the tunnel structure stability and construction safety are ensured effectively.

Description

technical field [0001] The invention relates to a construction method for removing and replacing arches in soft rock deformed tunnel lining support. Background technique [0002] Railway construction in the western region is facing the challenges of complex environment and adverse geological safety construction issues. Due to the complex and special geological structure environment, the surrounding rock strength of the tunnel is low, the self-stabilization ability is poor, the supporting structure is deformed and stressed, and at the same time, it is affected by unfavorable factors such as high ground stress, groundwater and rock formations. It causes large deformation of the surrounding rock, leading to the deformation of the primary support structure, and even the deformation of the secondary lining of the tunnel, cracking and instability, which have to be frequently replaced. In particular, the secondary lining concrete even cracks and breaks, which seriously affects the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/00E21D11/10E21D11/38
CPCE21D11/003E21D11/10E21D11/38
Inventor 夏润禾杨振伟王立英王成武吴广明崔小鹏许前顺朱增耀张峰张翔孙伟刚王成刚
Owner CCCC SECOND HIGHWAY ENG CO LTD
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