Shield tail sealing device and shield machine

Abstract

The invention relates to the field of engineering machinery, and especially relates to a shield tail sealing device and a shield tunneling machine. The device comprises a sealing mechanism, and the sealing mechanism comprises an elastic sealing bag and a connecting piece which is fixedly connected with one end of the elastic sealing bag. The connecting part is detachably connected to an inner wall of a shield tail housing of the shield tunneling machine. The elastic sealing bag is provided with a fluid charging and discharging mouth. After pressurized fluid is disposed in the elastic sealing bag, the working surface of the elastic sealing bag abuts against the inner wall of the shield tail housing and a pipe piece. The sealing pressure of the elastic sealing bag is high, and is good in sealing effect. Moreover, the connecting part is detachably connected to an inner wall of the shield tail housing of the shield tunneling machine, thereby facilitating the replacement of the device.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a shield tail sealing device and a shield machine. Background technique [0002] With the development of urban construction in our country, the number of underground projects such as tunnels is increasing day by day, and the shield tunneling distance of tunnels is also getting longer and longer. At present, the commonly used shield tail seal type of shield machine is three-layer steel wire shield tail brush seal, which is welded at the shield tail. The three-layer shield tail brush forms two chambers, and the shield tail grease is injected into the chamber at the same time when the shield is advancing. , from the role of sealing and lubrication. [0003] However, according to previous construction experience, this form of shield tail seal has the following disadvantages: 1. The service life is short, generally for a section (about 1.5km); 2. The sealing pressure is low (abou...

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Problems solved by technology

[0003] However, according to previous construction experience, this form of shield tail seal has the following disadvantages: 1. The service life is short, generally for a section (about 1.5km); 2. The sealing pressure is low (about 0.3MPa), and the sealing effect is not good. Ideal, easy to leak slurry; 3. Installation, welding and cutting work is cumbersome and takes a long time; 4. Repeated welding and cutting processes are likely to cause deformation at the tail of the shield, which affects the quality of segment assembly

With the development of tunnels to deeper layers, the existing shield tail seals cannot meet the pressure requirements and cannot meet the shield tail seal requirements for shield excavation in confined water formations

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