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Construction method for shallow soil-covered river bed under shield tunnel

A technology for shield tunneling and construction methods, which is applied in tunnels, earthwork drilling, mining equipment, etc., and can solve problems such as changes in geological conditions, easy water gushing, collapse, unfavorable shield tunneling, etc., and achieve the effect of ensuring construction safety

Active Publication Date: 2008-02-27
CHINA RAILWAY NO 2 ENG GRP CO LTD
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Problems solved by technology

When the shield crosses the riverbed, not only the problem of shallow covering of soil exists, but also due to the rapid changes in geological conditions, the soil quality and groundwater conditions are also very complicated, which is very prone to water gushing and collapse accidents, and the setting of a reasonable earth pressure on the front of the shield is also a difficulty. These are very detrimental to shield propulsion

Method used

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  • Construction method for shallow soil-covered river bed under shield tunnel

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Embodiment

[0056] This embodiment is a construction method for the shield tunneling (Jiuting Station-Qibao Station) shield tunneling (Jiuting Station-Qibao Station) of the first phase project of Shanghai Rail Transit Line 9 to cross the river Xiaolai Port. The process flow is shown in Figure 1. Include the following main steps:

[0057] First, engineering research:

[0058] Investigate the basic conditions of the shield tunnel in this section that need to cross the riverbed and overburden of Xiaolaigang River, among which:

[0059] The height difference between the top of the shield tunnel and the planned river bottom is about 5.1m for the upper and lower lines, and about 2.3m for the east entrance and exit line;

[0060] The height difference between the shield tunnel and the current river bottom is: the upper and lower lines are about 6.6m, and the east entrance and exit line is about 4.0m; 2.3m;

[0061] The section shield tunnel that needs to cross the riverbed is about 19 meters ...

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Abstract

The construction process for shielded tunnel to penetrate through river bed with shallow covered soil layer includes the following steps: engineering investigation, river bed analogy, calculation and analysis, research and determination of technological scheme, determining auxiliary measures and setting the initial shielding parameters, river bed penetrating construction, etc. The auxiliary measures include foundation consolidation, setting anti-floating plate, surface blasting weight, etc. The initial shielding parameters include earth pressure, earth output amount, propulsion speed, grouting amount, etc. During the construction, one computerized real-time monitoring system is adopted for comprehensive monitoring on tunnel sedimentation, displacement and other conditions. The construction process can ensure safety and avoid water inrush, collapse and other accidents.

Description

technical field [0001] The invention relates to a construction method for a shield tunnel passing through a shallow soil-covered river bed, and belongs to the technical field of tunnel shield construction. Background technique [0002] With the development and utilization of underground space, the construction of shield method has been more and more widely used in our country. Shield method tunnel construction is a construction method of underground excavation and construction of tunnels under the ground. Shield tunneling is used as a tool for excavating underground soil, supporting soil and assembling tunnel lining. One ring is excavated, one ring is assembled, and the cycle Work until the entire tunnel is complete. The successful application of the shield tunneling method in subway construction in Beijing, Shanghai and other cities has made this construction technology more and more perfect in our country. [0003] Compared with the traditional drilling and blasting meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/093
Inventor 李林陈强崔学忠
Owner CHINA RAILWAY NO 2 ENG GRP CO LTD
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