Construction method of returning device of mechanical construction pump room equipment in tunnel

Abstract

The invention discloses a construction method of a returning device of mechanical construction pump room equipment in a tunnel. In the shield tunnel, after a pipe jacking machine achieves jacking downwards in place (the specific jacking depth is determined according to the depth of a pump room), firstly, muddy water in a muddy water bin is replaced by using balanced shield mud, and air is compressed to form a mud film; then, a mud inlet and discharging pipeline is dismounted in a pressure maintaining manner, a concrete pumping-in pipeline is connected in through a central pump pipe connector,a pipe jacking machine head partition plate and a shield body are unbound, a cutterhead is started to rotate, and an oil cylinder is contracted to withdraw the cutterhead; and the backward speed of amain machine and the concrete injection amount are strictly controlled to be balanced, compressed air injection is not stopped in the whole process, and the soil bin pressure is kept unchanged. Afterthe pipe jacking machine is pushed downwards in place, the device can operate the cutterhead to back off and carry out the bottom sealing procedure under pressure at the same time, the aim that the cutterhead main machine can be recycled is achieved, and the pump room bottom structure construction requirement is met.

Description

technical field [0001] The invention relates to a construction method of a retracting device for mechanized construction pump room equipment in a tunnel, and belongs to the technical field of tunnel shield construction. Background technique [0002] After years of development and utilization of urban underground space, there are fewer and fewer available resources in shallow underground space. Especially in the central area of ​​the city, it is very common for subway tunnels to be buried as deep as 30 meters, and the trend of deeper burial is more obvious. After deep burial, it means that it has to face greater groundwater pressure and newer and more complex geological conditions. Conventional mining method construction will become more and more difficult. There will be more and more mechanized construction represented by shield tunneling method. Construction needs to give priority to freezing method or mechanized construction. Due to the shortcomings of long construction p...

AI Technical Summary

Problems solved by technology

[0009] The present invention mainly solves the problem of mud film formed by the replacement of mud in the mud tank by the balance shield mud, the unbinding problem of the casing of the pipe jacking machine and the partition board of the cutter head, and the balance of the retreat speed of the main machine and the amount of concrete injected.

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