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Tunnel construction method

A technology of tunnel construction and construction method, which is applied in the direction of tunnel, tunnel lining, earthwork drilling and mining, etc. It can solve the problems of temporary support fracture, vault sinking is difficult to control, and construction risk increases, so that it is not easy to break and reduces construction costs. Risk, the effect of reducing the amount of subsidence

Pending Publication Date: 2021-09-21
中铁十四局集团第三工程有限公司 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventor found that under the same condition of the surrounding rock of the tunnel, as the area of ​​the excavation surface increases, the sinking of the vault is difficult to control, the temporary support is prone to breakage, and the probability of construction risks increases

Method used

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Embodiment 1

[0029] This embodiment discloses a tunnel construction method, comprising the following steps:

[0030] Step 1: Start at the initial end of the tunnel, and use the double-side-wall pilot-pit method to construct the part above the inverted arch of the tunnel.

[0031] Such as figure 1 As shown, the specific steps of the construction of the double sidewall pilot pit method are:

[0032] Step a: Excavate the pilot pit 1 on the upper left side of the tunnel to form the upper left step, and construct the initial support and temporary support after the excavation is completed.

[0033] Specifically, the excavation of the pilot pit 1 adopts multi-step excavation, and the excavation distance of each step is controlled at the distance of 1-2 steel frames. In this embodiment, the excavation distance of each step is controlled at about 1.5m. After the excavation is completed, the construction method of initial support and temporary support is as follows: the tunnel face and the side wa...

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Abstract

The invention relates to a tunnel construction method. The tunnel construction method comprises the following steps that excavation construction is conducted on the part above an inverted arch of a tunnel through a double-side-wall pilot tunnel construction method; after the part above the inverted arch of the tunnel is excavated to a set safe distance, a temporary support is dismantled; after the temporary support is dismantled by a set distance, the inverted arch part of the tunnel starts to be constructed; and excavation construction of the part above the inverted arch of the tunnel, dismantling of the temporary support and construction of the inverted arch part are synchronously conducted until the construction of the tunnel is completed. According to the construction method, a transverse support does not need to be arranged, so that the operation space is increased; and the temporary support is not prone to breakage, so that the construction safety is guaranteed, and the safety is better than that of a traditional method.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to a tunnel construction method. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] There are many methods of tunnel excavation, such as CD method, double-side-wall pilot-pit method, etc. Among them, double-side-wall pilot-pit method is a commonly used construction method in tunnel excavation. During the excavation process, the self-supporting capacity of the surrounding rock can be fully controlled, and the deformation of the surrounding rock can be controlled. [0004] At present, the construction of urban tunnels is becoming larger and larger with the scale of people's functional requirements. The scale of tunnels is also gradually developing in the direction of multiple, large and long. in people's field of vision. The inventors found that un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/12
CPCE21D11/105E21D11/12
Inventor 李德祺王键潘卢心吴文俊舒金会曹梦洁李鹏程张国柱李树忱冯现大袁超邢科航卢彬鲁瑞
Owner 中铁十四局集团第三工程有限公司
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