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A low-gas shield tunnel construction method

A technology for shield tunneling and construction methods, which is applied in tunnels, tunnel linings, ventilation of mines/tunnels, etc., can solve problems such as hidden dangers of construction safety, lack of reducing the gas volume of low-gas shield tunnels, etc., so as to reduce the gas content and reduce the The effect of construction risk

Active Publication Date: 2019-08-20
POWERCHINA RAILWAY CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the prior art lacks an effective means to reduce the amount of gas in the low-gas shield tunnel. During the construction of the low-gas shield tunnel, the gas is only discharged through ventilation means, and there is a certain construction safety. Hidden dangers, the purpose is to provide a low gas shield tunnel construction method to solve the above problems

Method used

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  • A low-gas shield tunnel construction method
  • A low-gas shield tunnel construction method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a low-gas shield tunnel construction method of the present invention includes the following steps: S1: Design the slag discharge scheme of the shield machine, and set the slag discharge scheme as the slag discharge from the side of the trolley; S2: According to the amount of slag discharge Select the model of the screw discharge machine and the model of the slag transport battery car, and determine the type and quantity of the gantry crane at the shield tunnel according to the amount of slag discharged; S3: Ventilate the shield tunnel and set up gas monitoring points; S4: Tunneling in the shield machine During the process, the muck is improved with foam and water until the muck forms a soil plug on the screw conveyor; S5: Excessive grouting at the joints of the formed tunnel; S6: When the gas in the tunnel exceeds the limit, an emergency plan is implemented.

[0035] When this embodiment is implemented, the slag discharge scheme of the shield ...

Embodiment 2

[0037] Such as figure 2 As shown, in this embodiment, on the basis of Embodiment 1, step S6 includes the following sub-steps: S61: setting the first threshold and the second threshold of the gas limit; S62: when the gas concentration reaches the first threshold, emergency shutdown of the spiral Conveyor gate, stop shield tunneling and strengthen ventilation; when the gas concentration reaches the second threshold, the gas will be pre-released in advance. The gas pre-release includes the following steps: determining the pre-discharge means according to the geological conditions in front of the shield tunnel; the pre-discharge means include excavating a vertical shaft in front of the tunnel face and constructing multiple groups of boreholes in front of the tunnel face. The excavation shaft in front of the tunnel face includes a vertical shaft and an inclined shaft, and the direction of the inclined shaft is consistent with the direction of the surrounding rock joints.

[0038]...

Embodiment 3

[0040] In this example, on the basis of Example 1, the foam described in step S4 is a foam with an FER of 15, and the concentration of the foam mixture is 3%.

[0041] During the implementation of this embodiment, the inventor found that the purpose of realizing the soil plug can be achieved through the foam of this proportion.

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Abstract

The invention discloses a construction method of a low gas shield tunnel. The method comprises the following steps that a deslag scheme of a shield machine is designed as chassis side-surface deslag;the model of a spiral discharging device and the model of a slag moving battery car are selected according to the deslagging amount; the model and number of gantry cranes in a shield well are determined according to the deslagging amount; the shield tunnel is ventilated, and gas monitoring points are arranged; in the driving process of the shield machine, foam and water are used improve slag so that the slag forms a soil plug in a spiral conveyer; and seams of the formed tunnel is grouted excessively. According the construction method, the gas source of the low gas shield tunnel is divided into gas penetration in a spiral conveyer port, gas penetration in the seams of the formed tunnel and gas release of slag in the deslagging process; aimed construction measures can be adopted for different sources; and the gas content in the low gas shield tunnel is reduced from the source, and the construction risk of the low gas shield tunnel is reduced effectively.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a low-gas shield tunnel construction method. Background technique [0002] According to the field test and comprehensive analysis in the survey stage, the Chuansu Wharf Oil and Gas Field and the Sanwan Oil and Gas Field on the entire line of Chengdu Rail Transit Line 18 have different degrees of gas distribution in different sections along the line. This bidding section is located at the junction of Sumao oil and gas field and Sanwan oil and gas field. Su Wharf gas field, the controlled reserves of natural gas are 74.38×10 8 m 3 , the recoverable reserves are 29.75×10 8 m 3 , gas-bearing area of ​​94.0km 2 . The main gas reservoirs in the high-yield gas well section of the Penglaizhen Formation in the Sumao structure are buried at a depth of about 550-1500m. After analyzing the cross-sectional pressure of the main faults in the Sumao structure, it is found that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/06E21D9/12E21D11/10E21F1/08E21F17/18
Inventor 李新强王英俊薛彦军孟庆明肖政伟赵炜李元坤
Owner POWERCHINA RAILWAY CONSTR