Telescopic main drive sealing device of larger-diameter shield machine

Abstract

The invention discloses a telescopic main drive sealing device of a larger-diameter shield machine, wherein a sealing clamp ring is fixedly arranged at the lower part of a shield body, an air bag seal is arranged at the lower part of the sealing clamp ring, a sealing caulking ring is fixed on the sealing clamp ring, lip seals are nested at the lower part of the sealing caulking ring, the lip seals are closely contacted with a driving box, and the lip seals are positioned in front of the air bag seal; a sealing pressure ring is fixed at the front side of the sealing clamp ring, a snap ring is fixed at the upper part of the sealing pressure ring, the upper part of the snap ring is in clamp connection with the lower part of the shield body, a slag removal plate is fixed at the lower part of the sealing pressure ring by a pressing plate, and the lower part of the slag removal plate is arranged on the driving box. The upper part of the telescopic main drive sealing device is clamped at the lower part of the shield body, and the residue soil or mud in a soil chamber can be sealed in a main drive stretching process by means of enabling the lip seals or air bag seal to be connected with the driving box; furthermore, a cutter is more conveniently replaced under a condition of atmospheric pressure or belt pressure, so that a cutter head of the shield machine is bailed out in case of emergency, and the shield machine is further enabled to carry out shield construction smoothly.

Description

technical field [0001] The invention relates to the technical field of subway tunnel construction, in particular to a retractable main drive sealing device for a large-diameter shield machine, which is mainly used in composite or hard rock formations. Background technique [0002] With the progress of society, in order to alleviate traffic pressure, underground traffic engineering is an important development direction of urban municipal engineering. At present, the tunnels of national key projects such as urban underground highway tunnels and road-rail dual-purpose tunnels are all large-diameter tunnels, which are constructed using large-diameter earth pressure balance shields or mud-water balance shields. The design diameter of relevant project tunnels has exceeded 15 meters. [0003] The super-large diameter (more than 14m) long-distance tunnel constructed by the shield method has become the development trend of a new round of urban highway tunnel construction. As of 2014...

AI Technical Summary

Problems solved by technology

With the increase of the excavation section, the number of cutter heads increases, and the risk of cutter head being stuck increases.

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