Shield tail brush sealing performance testing device and testing method thereof

Abstract

The invention discloses a shield tail brush sealing performance testing device and a testing method thereof. The shield tail brush sealing performance testing device comprises a framework, a pressure testing groove, a top cover and a pressure monitoring device. A plurality of tested tail brushes are installed on an in-groove bottom of the pressure testing groove. The internal of each tested tail brush is connected to an oil pipeline having an oil supply through in a sealing manner, wherein the oil pipeline is arranged in an oil supply through hole on the bottom of the pressure testing groove, and thus is communicated with an oil supply system. A rightmost cavity in an inclination direction of the tested tail brush passes through a slurry pipeline in a slurry supply hole formed on the pressure testing groove bottom in a sealing manner and is communicated with a slurry injection system. A pressure signal input terminal of the pressure monitoring device is connected to pressure testing devices which are respectively arranged in a high pressure cavity and a low pressure cavity through a cable. The shield tail brush sealing performance testing device and the testing method thereof can adopt the mode of the shield tail brush and arrange the shield tail brushes under different pressure conditions, and avoid tunnel construction risks caused by leakage due to inappropriate mode selection of the tail brush.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a shield tail brush sealing performance test device and a test method thereof. Background technique [0002] In the process of tunnel construction using shield tunneling, the shield tail brush itself is not of high value, but it has an impact on the success or failure of shield tunneling construction. During the construction process of the shield, it mainly relies on the cover of a rigid shell, and continuously excavates forward through the installation of segments. Because the shell of the cover is constantly digging forward through the propelling cylinder, in order to ensure that the shell does not squeeze or damage the segment, there is an annular gap between the shell and the outside of the segment, and the outside of the segment is the state of underground high pressure, and the inside of the segment is under high pressure. It is working under normal pressure, a...

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Problems solved by technology

[0003] In the current shield design process, conventional engineering design mainly relies on experience. Foreign shields are equipped with 4 tail brushes, and we also install 4, because the conventional engineering pressure is low, such as ordinary subways only have a pressure of 2-3bar , generally there will be no major sealing problems, but with the development of my country's economy, there are more and more large-diameter, high-buried and deep underwater tunnels, such as the Weisan Road Tunnel, the Chongming Tunnel, and the Wuhan River-Crossing Tunnel that have been completed. , the Guangzhou-Shenzhen-Hong Kong Shiziyang Railway Tunnel, the Shiziyang Tunnel of the Foguan Intercity Railway, the Suai Passage, etc., and the Qiongzhou Strait Tunnel and the Bohai Bay Tunnel that are currently being planned in my country, especially the Qiongzhou Strait Tunnel with a buried depth of 170 m, currently there is no relevant experience in the tunnel construction industry, so scientific methods must be used to carry out relevant calculations and experimental verifications for the shield tunnels constructed

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