SCAP type cabin opening method with pressure based on earth pressure balance shield machine

Abstract

The invention discloses a SCAP type cabin opening method with pressure based on an earth pressure balance shield machine. Grain composition of a stratum where the shield machine is located is collected, and a suitable mud material is selected. A gap between the shield machine and the stratum where the shield machine is located, and pores of a soil body of an excavation surface are injected with mud to be blocked, and the soil body around the shield machine is reinforced; a part of muck in a soil cabin is discharged, mud is injected into the soil cabin, and the excavation surface is kept stable; then a cutter disc is retracted, seepage pressure of the mud in the soil cabin is improved to conduct mud seepage, and an integral air tight mud film is formed on the excavation surface; and finally, the muck and the mud are discharged to prepare cabin opening operation. The mud film is effectively formed, stability and the airtight property of the excavation surface are ensured, the problems ofdifficulty of cabin opening with the pressure in a high-permeable stratum, and poor air tightness are solved, and preparation time of the cabin opening operation with the pressureis saved. Accordingto the SCAP type cabin opening method, the technological process of mud film formation is easy and simple to do, other equipment does not need to be added, andthe simple and practicable, quicker and more economic method of earth pressure shield cabin opening with the pressure is provided.

Description

technical field [0001] The invention belongs to the technical field of underground engineering construction, and in particular relates to an SCAP-type pressurized opening method of an earth pressure balance shield tunnel. Background technique [0002] When the shield machine passes through the high-permeability gravel stratum during excavation, due to the high stratum strength, severe wear and collapse of the cutter often occurs, and even the wear of the cutter head requires stopping the machine to change the tool, so the shield machine must be shut down and started. cabin, and repair or replace worn knives to improve the construction efficiency of the shield machine. [0003] At present, it has become a routine operation of shield tunnel construction in my country to shut down and open the cabin for maintenance when the shield machine excavates abnormally. With the development of underground space in our country, the number of metro construction cities is increasing. At pr...

AI Technical Summary

Problems solved by technology

At present, only a single mud material can be used, which needs to be prepared by a special manufacturer and transported to the construction site. The material preparation process is strict and time-consuming. The mud film formation process is complex and pressurized. The purchase price of mud materials is very expensive, and frequent openings are costly. Too high and the preparation process takes too long

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