Construction method of half-light and half-dark tunnel entry

A semi-dark, semi-dark, construction method technology, applied in tunnels, tunnel linings, earthwork drilling and other directions, can solve problems such as difficult construction, and achieve the effect of shortening the construction period, saving construction costs, and reducing damage

Active Publication Date: 2020-06-16
中铁十七局集团第三工程有限公司
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  • Description
  • Claims
  • 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 multiple threaded steel bars to connect with the first arch frame; install the third arch frame at the tunnel opening along the small mileage direction;

[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 formwo...

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Abstract

The invention provides a half-dark tunnel entry construction method, comprising the following steps: A. clearing dangerous rocks on the side slope of the tunnel, and installing a pipe shed at the vault of the tunnel; B. setting the tunnel arch; C. tunneling Excavation and blasting shall be carried out in the dark hole, and primary support and secondary lining shall be implemented in the tunnel; D. The tunnel roof shall be backfilled with backpressure, and a protective structure shall be set up on the tunnel side slope. The half-light and half-dark tunnel entry construction method provided by the present invention cleans up the dangerous rocks on the side slope and installs a pipe shed at the vault of the tunnel to reduce the risk of falling dangerous rocks on the side slope and ensure construction safety; The tunnel excavation and blasting construction is carried out after the casing arch is installed, which reduces the disturbance to the surrounding rock strata and the damage to the casing arch by flying stones; backfilling the cave roof by backfilling with back pressure can effectively offset the bias pressure of the tunnel and prevent tunnel deformation; The construction method solves the problem of difficult construction protection of half-lit and half-dark tunnels on high slopes, shortens the construction period, and saves construction costs.

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 Patents(China)
IPC IPC(8): E21D9/00E21D9/14E21D11/00E21D11/10
CPCE21D9/00E21D9/14E21D11/00E21D11/10
Inventor 姚亮朱克成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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