A kind of construction method for ventilation of shield earth silo

Abstract

The invention provides a construction method for ventilating shield tunnels. Firstly, the shield tunneling machine is shut down to keep the pressure so that it will no longer drive forward, and then the ventilation of the advanced tunnel is strengthened so that the The gas quality remains normal, and then the shield machine and the tunnel part close to the shield machine are isolated from the surrounding soil to prevent toxic and harmful gases from entering the tunnel and the soil chamber of the shield machine, and to isolate the source of toxic and harmful gases. Finally, the poisonous and harmful gas in the soil bin is discharged to realize the ventilation construction of the shield tunneling soil bin. By adopting the ventilation construction method of the shield tunneling machine, it is possible to isolate the toxic and harmful gas in the ground where the shield machine is excavated from the tunnel and the soil bunker of the shield machine, and at the same time replace the toxic and harmful gas in the shield tunneling bunker, The good air quality in the soil warehouse is maintained, so that the operators can carry out pressurized operations, achieve the purpose of entering the warehouse in the toxic and harmful gas area, and at the same time ensure the safety of the personnel entering the warehouse and the safety of the surrounding environment.

Description

technical field [0001] The invention relates to the field of underground tunnel construction, in particular to a construction method for ventilating a shield tunnel. Background technique [0002] In the process of excavating underground tunnels using the shield method, the cutter head in front of the shield machine cuts the soil, the shield body of the shield machine pushes forward, and the shield tail of the shield machine lays supporting segments and sprays grout, so as to realize the excavation of the tunnel. The construction of the "shield" of penetration and tunnel. However, during the propulsion process of the shield machine, it may advance to an area with a large amount of toxic and harmful gases. For example, the soil in the area is rich in methane, carbon monoxide, and hydrogen sulfide. These toxic and harmful gases will affect the construction of the shield machine. The lives of personnel are threatened. If the shield machine is difficult to move forward due to th...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that it is difficult to ensure the safety of the operation in the soil bin of the shield machine when it is necessary to enter the warehouse in the toxic and harmful gas area to replace the cutter on the cutter head in the process of excavating an underground tunnel by the shield tunneling method in the prior art. The problem is to provide a ventilation construction method for the shield tunneling soil bunker, which can isolate the toxic and harmful gases in the stratum where the shield tunneling is located, and at the same time replace the toxic and harmful gases in the shield tunneling bunker, maintaining a good environment in the soil bunker. The air quality meets the requirements that operators can carry out under pressure operations, achieve the purpose of entering the warehouse in a toxic and harmful gas environment, and at the same time ensure the safety of the personnel entering the warehouse and the safety of the surrounding environment

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