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Large-section loess tunnel construction method

A technology for loess tunnels and construction methods, applied in tunnels, earthwork drilling, mining equipment, etc., can solve problems such as complex construction, high cost, and slow progress, and achieve stable initial support, small disturbance of surrounding rock, and reliable engineering quality Effect

Active Publication Date: 2010-10-20
CHINA RAILWAY 23RD BUREAU GRP THIRD ENG CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a large-section loess tunnel construction method to solve the problems of complex construction, slow progress and high cost in the prior art

Method used

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  • Large-section loess tunnel construction method
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Embodiment

[0021] Example: see figure 1 , the present invention firstly divides the entire section into four parts: the upper part 1, the middle part, the lower part and the bottom part, wherein the middle part is further divided into the middle left area 2, the middle right area 4 and the middle middle area 6, and the lower part is also divided into the lower left area 3. For the lower right area 5 and the lower middle area 7, the four parts are excavated by step method. During the excavation, the upper part 1 is ahead of the middle part by 3~5m, the middle part is ahead of the bottom part by 3~5m, and the bottom part is ahead of the bottom 8. The length is 10m, and excavation is carried out step by step, and the steps are as follows for each part:

[0022] The first step: Excavation of the upper part 1 ring, ballasting and initial support of the upper part 1:

[0023] First, carry out advanced support for the upper part 1 area, and then use the arc-shaped pilot pit method to excavate ...

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Abstract

The invention discloses a large-section loess tunnel construction method, which comprises the following steps that: the whole section is divided into an upper part, a middle part, a lower part and a bottom part, wherein the middle part is divided into a middle left area, a middle right area and a middle intermediate area, the lower part is divided into a lower left area, a lower right area and a lower intermediate area, the four parts are excavated in a benching tunneling method with altitude differences, the upper part is 3-5m in front of the front middle part, the middle part is 3-5m in front of the front lower part, the lower part is 10m in front of the front bottom part, and the step-by-step tunneling excavation is carried out. The invention is suitable for collapsed loess areas, realizes the safe and reliable construction and saves a large number of temporary supporting steel frames. Due to the arc-shaped pilot tunnel method, the loop can be formed rapidly during excavation, the disturbance to the surrounding rock is low, the primary support is stable, the traditional construction method is further improved to be the 'two-step and four-part excavation method', and the construction cycle period is short. Moreover, the invention can speed up the progress of the project, shorten the construction period, and reduce the cost of the project.

Description

technical field [0001] The invention relates to a tunnel excavation construction method, in particular to a large-section loess tunnel construction method. Background technique [0002] With the construction of high-speed railways in our country, the construction of large-section railway tunnels is in full swing, which is characterized by large excavation sections, so the construction difficulty is greatly increased, especially in collapsible loess areas, the construction of large-section passenger dedicated line tunnels a difficult problem. In the prior art, there are eleven-part method, nine-part method, and six-part method, and then multi-step excavation is adopted, but because there are many blocks, more temporary supports are required, and the construction cost is relatively large. As a result, the construction of various steps interferes with each other and the construction progress is slow. Contents of the invention [0003] The object of the present invention is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/04
Inventor 丁维军李治强董凤杰朱华平黎龙强樊建国周川岭
Owner CHINA RAILWAY 23RD BUREAU GRP THIRD ENG CO LTD
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