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Tunnel-entering construction method for semi-open and semi-underground tunnel

A half-light and half-dark construction method technology, applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve problems such as difficult construction, achieve the effects of shortening the construction period, saving construction costs, and reducing damage

Active Publication Date: 2019-01-15
中铁十七局集团第三工程有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a half-dark tunnel entry construction method, which aims to solve the technical problem of difficult construction existing in the prior art

Method used

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specific Embodiment approach

[0034] As a specific embodiment of the semi-dark tunnel entry construction method provided by the present invention, step B specifically includes the following steps:

[0035] B1. Tunnel excavation: When the upside slope brushes to the arching line, measure and set out the line to determine the position and elevation of the arch; adopt the excavation method of layered excavation to reserve the core soil, and slot both sides of the arch side wall ;

[0036] B2. Installing the arch: install the first arch at the tunnel entrance, and fix the first arch with lock-foot anchors; install the second arch at the entrance of the tunnel along the long-distance direction Use multi-threaded steel bars to connect with the first arch frame; install the third arch frame at the tunnel opening along the direction of the small mileage;

[0037] B3. Formwork production: use the dark hole primary support steel frame as the bottom formwork support, use square wood as the bottom formwork and top fo...

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Abstract

The invention provides a tunnel-entering construction method for a semi-open and semi-underground tunnel, which comprises the steps of A, clearing dangerous rocks on the slope of the tunnel, and setting up a pipe shed at the vault of the tunnel; B, setting up a cover arch in the tunnel. C, implementing excavation blasting on a buried tunnel, and carrying out primary support and secondary lining inthe tunnel; and D, back pressure backfilling the top of the tunnel, and setting up a protective structure on the slope of the tunnel. According to the tunnel-entering construction method for the semi-open and semi-underground tunnel, the dangerous rocks on the slope of the tunnel are cleared and the vault of the tunnel is provided with the pipe shed so as to reduce the falling risk of the dangerous rocks on the slope and ensure the construction safety; the excavation blasting construction is carried out on the buried tunnel after the installation of the cover arc at the entrance of the tunnelso as to reduce the disturbance for surrounding rock strata and damages imposed on the cover arc by flying rocks; and the top of the tunnel is backfilled by adopting the back pressure backfilling mode, thereby being capable effectively neutralizing the bias pressure of the tunnel to prevent the deformation of the tunnel. The construction method solves a problem of difficult protection in the construction of the semi-open and semi-underground tunnel with a high slope. In addition, the construction period is shortened, and the construction cost is saved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and more specifically relates to a half-light and half-dark tunnel entry construction method. Background technique [0002] Tunnel excavation and slope construction technology has become mature now. There are still few semi-dark tunnel constructions on high tunnel slopes in China. The construction of semi-dark tunnels is very difficult. The main difficulties are: 1. High construction risk, There is a risk of falling rocks on the slope; 2. The bias pressure of the tunnel is serious, how to monitor the deformation of the tunnel to ensure the safety of the tunnel construction; 3. The blasting control is difficult, how to control the blasting parameters to ensure the safety and quality of the construction in the tunnel; 4. Tunnel After the construction is completed, how to solve the risk of tunnel bias and rockfall to ensure the safety of existing lines. Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/14E21D11/00E21D11/10
CPCE21D9/00E21D9/14E21D11/00E21D11/10
Inventor 姚亮蔡晓明曹松俊刘飞毕腾飞张新波
Owner 中铁十七局集团第三工程有限公司
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