Construction method for penetrating through gas pipeline with pressure downwards at ultra-close distance by using shield tunneling machine

Abstract

The invention discloses a construction method for penetrating through a gas pipeline with pressure downwards at an ultra-close distance by using a shield tunneling machine, and relates to the technical field of shield tunneling machine construction methods. The construction method comprises the following steps of stopping the shield tunneling machine; accurately positioning the gas pipeline; performing three-dimensional modeling; adjusting the slope of the line, and calculating the nearest distance between the shield tunneling machine and the gas pipeline; replacing fuel gas; re-pushing the shield tunneling machine; grouting for the second time; and recovering the fuel gas. According to the construction method, nitrogen is adopted for replacing fuel gas for pressure maintaining, and the risk when the shield tunneling machine passes is reduced; the soil settlement at a shield body is guaranteed by adopting an anti-mud-effect construction method, and the soil pressure balance in the crossing process is guaranteed; a robot is used for pipeline detection, so that the position of an underground pipeline is conveniently and accurately detected; and the influence on the pipeline when the shield tunneling machine penetrates through the gas pipeline downwards is greatly reduced, the ground subsidence is reduced, the safety of the gas pipeline is guaranteed, the economic cost of pipeline diversion and the expense of long-time idleness of shutdown of the shield tunneling machine are eliminated, and great economic benefits are obtained.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling machine construction methods, and in particular relates to a construction method of using a shield tunneling machine to pass through a gas pipeline under pressure at an ultra-short distance. Background technique [0002] In recent years, the urban infrastructure has developed rapidly, and the underground pipeline network is criss-crossed. There are more and more intersections between shield tunneling construction and pipelines, which brings unprecedented difficulties and risks to shield tunneling construction work. In the project, pipelines are often passed down through the pipeline at a short distance, and the method of diverting the pipeline or adjusting the shield line is usually used to pass the risk source. This method is costly, delays the construction period, and is not conducive to the development of the shield construction; It is possible to damage the pipeline, and the conseque...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method using a shield machine to pass through a gas pipeline under pressure at an ultra-close distance, so as to solve the existing problem: using the method of diverting the pipeline or adjusting the shield tunnel to pass through the risk source, the cost is relatively large, Delaying the construction period is not conducive to the development of shield tunneling; directly passing through the risk source is very likely to damage the pipeline, and the consequences will disrupt production and life in a large area, and even cause fire or explosion, resulting in large economic losses

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