A construction method for the shield machine to go under the existing station and start

Abstract

The invention discloses a construction method enabling a shield tunneling machine to underneath pass through an existing station to start. A steel sleeve is adopted for construction, and the followingflow including bottom plate levelling and steel plate laying for an underneath passing channel, vertical freezing reinforcement for a tunnel door, installation for the lower half-circle of the steelsleeve, downhole installation for the shield tunneling machine, overall underneath passing and longitudinal movement of the steel sleeve, breaking for the tunnel door, installation for a negative ring, backfilling for the sleeve, pressure testing, pulling-out for a freezing pipe, sealing for a freezing hole, and starting of the shield tunneling machine. The steel sleeve comprises a main sleeve body, a transition ring, a reinforcing ring, a bottom frame and a counter-force frame, wherein the main sleeve body is formed by splicing four sections of sleeve bodies with the same length; and each sleeve body is composed of an upper half-circle sleeve body and a lower half-circle sleeve body. The transition ring is connected to the front end of the main barrel body; the reinforcing ring is connected to the rear end of the main barrel body; the bottom frame is also divided into four sections of bases; and the counter-force frame is connected to the rear end of the reinforcing ring. According tothe construction method, damage to a constructed station structure can be avoided, the construction risk and difficulty of starting driving of the shield tunneling machine and later-period detachmentfor the sealing device for the tunnel door are lowered, and the construction period is accelerated.

Description

technical field [0001] The invention relates to a construction method for a shield tunneling machine to go under an existing station. Background technique [0002] In recent years, my country's urban underground rail transit has developed rapidly. During the construction of underground tunnels, shield machines are usually used for tunnel excavation. Shield line planning is affected by related factors such as the urban environment and the subway line under construction. It is inevitable that the newly built subway line will cross and underpass the existing underground track project, or due to the small starting site, the cross operation Many, the shield machine needs to temporarily borrow the site of the existing station for the hoisting ground operation area when the shield machine goes down the well, so that after the shield machine goes down the mine, it needs to be pushed forward and vertically moved down through the existing station to the portal before starting, which i...

AI Technical Summary

Problems solved by technology

Shield line planning is affected by related factors such as the urban environment and the subway line under construction. It is inevitable that the newly built subway line will cross and underpass the existing underground track project, or due to the small starting site, the cross operation Many, the shield machine needs to temporarily borrow the site of the existing station for the hoisting ground operation area when the shield machine goes down the well, so that after the shield machine goes down the mine, it needs to be pushed forward and vertically moved down through the existing station to the portal before starting, which is easy for the existing station The structure was damaged, and major safety accidents such as settlement exceeding the limit and collapse occurred

If the traditional departure plan is still adopted, it is easy to cause leakage of the portal, collapse of the ground, and failure of departure; it may even cause uneven deformation, cracking and leakage of the station structure

In addition, when the shield machine goes under the existing station to start construction, noise and vibration will be generated when the tunnel door is cut out, and the tunnel door enclosure structure is excavated, which will have a great impact on the daily operation of the existing station and passengers ;During the tunneling and excavation of the shield machine, the soil under the floor of the existing station is greatly disturbed, and it is easy to over-excavate, easily form a cavity, and groundwater pours in

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