Subway shield gas tunnel construction method

Abstract

The invention discloses a subway shield gas tunnel construction method, which comprises the following steps: 1, dividing a gas tunnel to be constructed into one or more harmful gas pressure sections from end to end; 2, respectively constructing the harmful gas pressure sections in turn according to the construction work stages of the gas tunnel to be constructed, wherein construction processes of one harmful gas pressure section are as follows: calculating limit gas emission and correspondingly judging the level of the gas tunnel, and modifying the explosion protection performance of a shield machine, the ventilation quantity of a ventilation system and a gas monitoring control system; setting the driving speed of the shield machine; performing shield driving construction; and performing duct piece assembly and lining construction; and 3, completing constructing all the harmful gas pressure sections of the gas tunnel to be constructed until realizing the run-through of the gas tunnel to be constructed. The method has the advantages of skillful and reasonable design, convenient implementation, small construction difficulty and good construction effect, and can effectively solve the problem of safe construction for running through a shield tunnel of a gas reservoir, namely a subway shield gas tunnel.

Description

technical field [0001] The invention belongs to the technical field of subway tunnel construction by a shield method, and in particular relates to a construction method for a subway shield gas tunnel. Background technique [0002] With the development of my country's economy and the acceleration of urbanization, the pressure of urban traffic has become more prominent. At present, underground rail transit has become the mainstream direction of urban traffic development. However, at present, the underground shallow harmful gas (biogas) found in the subway engineering survey process of the coastal Yangtze River Delta cities (such as Shanghai, Hangzhou, Ningbo, Suzhou) and inland cities with large rivers and large rivers has become a major issue in the construction of subways. a hazard. [0003] Take Wuhan's key construction project, its subway project, as an example. Wuhan Metro Line 2 is the first subway project in Wuhan. At the same time, the Fan-Han Interval Tunnel is also ...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: since the design stage of Wuhan Metro Line 2 did not consider the existence of underground gas in the Fan-Han section, once the design line is changed, the entire Wuhan Metro Line 2 will be affected, resulting in huge economic losses and a long construction period

The disadvantage of this method is that the open cut method must close the road, which has a huge impact on urban traffic, and the construction period is long, and the corresponding construction cost will also increase

The disadvantages of this method are: the gas pumping effect is not obvious, and at the same time, the ground drilling needs to close the road to discharge the gas, which has a great impact on traffic, and it is difficult to carry out traffic guidance reform, and the implementation is difficult

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