A construction method for the retraction device of the mechanized construction pump room equipment in the tunnel

Abstract

The invention discloses a construction method of a retracting device for mechanized construction pump room equipment in a tunnel. In a shield tunnel, after a pipe jacking machine is jacked downwards and in place (the specific jacking depth is determined according to the depth of the pump room), first, use Hengdun Mud replaces the muddy water in the mud tank and compresses the air to form a mud film; then, removes the mud inlet and discharge pipelines under pressure, connects the concrete pumping pipeline through the central pump pipe interface, and connects the partition plate of the pipe jacking machine head with the shield body Untie, start the cutter head to rotate and shrink the oil cylinder to retract the cutter head; strictly control the retreat speed of the main engine and the balance of the concrete injection volume, and do not stop the compressed air injection during the whole process to keep the pressure of the soil silo unchanged. After the pipe jacking machine is pushed down and in place, the device can operate the cutter head back and press the bottom sealing process to realize the purpose of recyclable cutter head main engine and meet the construction requirements of the bottom structure of the pump room.

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...

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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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