Construction method of subway tunnel penetrating through underground continuous walls of subway station

Abstract

The invention discloses a construction method of a subway tunnel penetrating through underground continuous walls of a subway station. The construction method comprises the following steps that a vertical shaft is excavated on the outer side of the first continuous wall, and a space enclosing structure is arranged; construction is conducted on a first freezing pipe to reinforce a first freezing pipe of soil mass in the rear of the first continuous wall in the vertical shaft in the direction of a newly-built subway tunnel, and the first freezing pipe is removed after reinforcing is completed; the first continuous wall is broken away in the direction of the newly-built subway tunnel, and thus a first tunnel portal is formed; slag and accumulated water in the vertical shaft are cleaned, and backfilling is conducted on the vertical shaft; a shield tunneling machine penetrates through the vertical shaft and the first continuous wall in the opening direction of the first tunnel portal; the shield tunneling machine is utilized to tunnel to the position of the second continuous wall, and tightly attached to the second continuous wall; a second freezing pipe for reinforcing soil mass is arranged on the outer side of the second continuous wall in a mode of obliquely drilling from the ground surface, and the second freezing pipe penetrates through the position below the newly-built subwaytunnel; shield position opening is conducted, the second continuous wall is broken away in the direction of the newly-built subway tunnel, and thus a second tunnel portal is formed; and the second freezing pipe is removed, and the shield tunneling machine penetrates through the second continuous wall in the opening direction of the second tunnel portal.

Description

technical field [0001] The invention belongs to the technical field of subway station construction, and in particular relates to a construction method for a subway tunnel passing through an underground diaphragm wall of a subway station. Background technique [0002] With the rapid development of my country's urban rail transit construction, multiple subway lines cross each other to form a subway network line, which greatly improves the travel efficiency of passengers. However, in the process of connecting subway lines into a network, it is inevitable that the subway tunnels of the new lines will pass through the existing stations. In Beijing, Guangzhou, Shanghai, Nanjing, Suzhou and other domestic cities and in London, New York, San Francisco, etc. There are similar engineering examples in foreign cities. [0003] In the Yangtze River Delta region of our country, the surface soil layer is dominated by water-rich soft soil. The subway tunnels are usually constructed using t...

AI Technical Summary

Problems solved by technology

[0006] However, when there is a connecting passage on one side of the subway station, there is no condition for excavating a vertical shaft outside the underground diaphragm wall of the subway station on this side. At this time, it is difficult to continuously break the underground, and the construction of a new subway tunnel cannot be carried out smoothly.

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