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Methane static pressure exhaust construction method

A biogas and static pressure technology, used in gas discharge, safety devices, mining devices, etc., can solve problems such as large differences in stratum bearing capacity, rupture and damage of segments, and deformation of tunnel structures, achieving favorable emissions and high costs. , the effect of long construction period

Inactive Publication Date: 2020-11-13
CHINA RAILWAY 19TH BUREAU GRP RAIL TRANSIT ENG
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the distribution of underground gas is uneven, the air pressure is different, and the bearing capacity of the formation is quite different, it often causes uneven settlement during the gas release process, which in turn induces serious deformation of the tunnel structure, and even segment fracture and damage
[0006] 2. During the construction process, when the shallow methane gushes out in a large area, due to poor ventilation, it will cause accumulation within a certain range
When the concentration is within the explosion limit range of 5% to 15%, a violent explosion will occur when encountering an open flame, which will seriously endanger personal safety.

Method used

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  • Methane static pressure exhaust construction method

Examples

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Effect test

Embodiment 1

[0041] as attached figure 1 and 2 As shown, a biogas static pressure exhaust construction method provided for an embodiment of the present invention includes the following steps:

[0042] 1. Measurement positioning:

[0043] First, according to the specific location of each biogas discharge hole determined by the design, the coordinates are collected in the electronic topographic map, and then the surveyor adopts the GPS-RTK method on the basis of the ZJCORS platform, according to the "Global Positioning System Real-time Kinetic Measurement (RTK) Specification" (CH / T2009-2010) requires surveying, and the coordinate results adopt the local coordinate system and the 1985 national elevation datum; since the points of this project are on land, the point marks are marked with red spray paint to prevent man-made damage; if the biogas discharge hole needs to be moved, it should pass through The person in charge of the project and the general contractor, supervisor, designer, and t...

Embodiment 2

[0126] Apply the biogas static pressure exhaust construction method in Example 1 to the section from Hejing Road Station to Qingliu Road Station, the section from Qingliu Road Station to Qingpeng Road Station, and the section from Qingpeng Road Station to Yipeng in the first phase project of Hangzhou Metro Line 8 East 2nd Road station section project.

[0127] Among them, the section from Jinglu Station to Qingliu Road Station is an underground shield section. This section mainly passes through the residential area of ​​Jianyi Village and Xiaosibuzhi River. The length of the line is 987.968m; left DK10+738.712~left DK11+726.678, the length of the left line is 2.223m, the length of the left line is 990.189m, and a communication channel is set up in the section.

[0128] Among them, the section from Qingliu Road Station to Qingpeng Road Station is an underground shield section. The line extends eastward after exiting Qingliu Road Station, deflects to the southeast after passing ...

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Abstract

The invention is suitable for the technical field of shield tunnel methane discharge, and provides a methane static pressure exhaust construction method. The methane static pressure exhaust construction method comprises the following steps of measuring and positioning, pipeline detection, pressing on a probe rod through a static pressure device, methane discharge and hole sealing, construction hole backfilling and pavement restoration. According to the method, comprehensive construction technologies, such as a static pressure pore-forming technology, a controlled discharge technology, a hole sealing and backfilling technology, are creatively adopted, so that the air pressure of an interval biogas layer is successfully reduced to 0.05 Mpa or below, the problem that shallow methane harms engineering construction and personnel is well solved, and good social, economic and environmental benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of methane discharge in shield tunnels, and in particular relates to a construction method for static pressure discharge of methane. Background technique [0002] In recent years, with the increase of subway lines, more and more planned subway lines in coastal and riverside cities pass through biogas-bearing strata. Shallow biogas is mainly distributed in estuaries and continental shelf sea areas, and can be divided into two types according to its origin. One is the cause of thermal methane. Generally, the organic matter below 2000m below the seabed forms hydrocarbons due to kerogen cracking under high temperature and pressure, and its properties depend on the characteristics of the original organic matter and the geological environment. The other is biogenesis. When a large amount of terrigenous clastic material was deposited on the seabed, it brought abundant biological debris and organic matter. Methanob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21F17/18E21F17/00
CPCE21F7/00E21F17/18E21F17/00
Inventor 王晓旭王树才胡雷高崇
Owner CHINA RAILWAY 19TH BUREAU GRP RAIL TRANSIT ENG
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