PVC freezing pipe for shield tunneling freeze-consolidation

Abstract

A PVC freezing pipe for shield tunneling freeze-consolidation is used in a freeze-consolidation area. A shield tunneling machine penetrates through the freeze-consolidation area along the axis. The PVC freezing pipe comprises a pipe body, wherein the pipe body is made of PVC, the bottom end of the pipe body is sealed by a PVC pipe choke plug, a flange assembly is arranged at the other end of the pipe body, the flange assembly comprises a steel flange plate on the outer side and a PVC flange plate on the inner side, the steel flange plate is connected with the PVC flange plate, a liquid inlet pipe passes through the flange assembly and then stretches into the pipe body, and a liquid outlet pipe is further arranged on the pipe body. The PVC freezing pipe for shield tunneling freeze-consolidation is simple in structure, convenient to operate, and capable of meeting engineering strength and deformation requirements in shield tunneling saline water freezing design. Meanwhile, the freezing pipe can be directly cut off during shield tunneling and does not need to be pulled out after freezing is achieved, and therefore safety of shield tunneling is improved.

Description

technical field [0001] The invention relates to the technical field of freezing of shield tunnels, in particular to a PVC freezing pipe for freezing and strengthening of shield tunnels. Background technique [0002] The artificial ground freezing method is to use artificial refrigeration technology to freeze the water in the ground rock and soil, turn the natural rock and soil into frozen soil, increase its strength and stability, and isolate the connection between groundwater and underground engineering, so that it can be frozen in the frozen wall. It is a special construction technology for underground engineering construction under protection. Its essence is to use artificial refrigeration to temporarily change the properties of rock and soil to strengthen the formation. The artificial ground layer freezing method is basically not limited by the support range and support depth, and can effectively prevent water gushing and adjacent soil deformation during urban excavation...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: the existing freezing method generally adopts low-carbon seamless steel pipes, but in the process of pulling out the frozen steel pipes, it is easy to cause a large amount of water and silt to flow out of the ground through the freezing holes and cause the door to collapse ; and the frozen tube is prone to breakage and residue, which poses a great risk for the shield machine to enter and exit the hole

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