Shield machine belt pressure chamber opening operation construction method

Abstract

The invention relates to a shield machine belt pressure chamber opening operation construction method. The method comprises the following steps: adjusting the posture of a shield, setting up tunneling parameters, and injecting bentonite slurry into a shield cutter head and the circumference thereof so as to make the soil mass around a tunnel face and the shield form a clay film capable of blocking off a leakage passage; establishing the air pressure in the soil chamber; carrying out the pressurization and chamber entry, making staff enter a personal gateway to check and change a cutter or even check the cutter head, and the like; carrying out decompression and chamber exiting; and after the operation is completed, injecting bentonite into the soil chamber through a pipeline, and staring the cutter head and a jack to restore the shield tunneling after the soil pressure balance is rebuilt in the soil chamber. The method reduces the gas permeability of a stratum by 30 percent compared with that of the original stratum, thereby meeting the belt pressure requirements, not only ensuring the safety of the workers operating in the soil chamber, but also ensuring the soil mass stability of the tunnel face. The method brings about a good strengthening effect and little ground surface deformation; as the reinforcement is carried out inside the tunnel, the method does not occupy ground area and brings about little influence on the ambient environment and urban traffic; and the method has the characteristics of high construction efficiency, short cycle, and low cost.

Description

technical field [0001] The invention relates to a construction method for opening a shield machine under pressure, in particular to a construction method for opening a shield machine with an earth pressure balance shield machine. Background technique [0002] Due to its safety, speed and efficiency, shield construction has been more and more widely used in various underground engineering constructions such as urban subways, municipal public pipelines, oil / gas underground pipelines, etc. When using a shield machine to excavate in water-rich sand and pebbles, due to the poor self-stabilization ability of the ground, the shield itself and supporting equipment must be used to provide support pressure (EPB) to stabilize the ground. The cutterhead cutters responsible for the tunneling function on the shield machine are consumable parts, which need to be checked, maintained and replaced frequently during construction. In water-rich sand and pebble formations, the wear of excavatio...

AI Technical Summary

Problems solved by technology

However, in this water-rich sandy gravel and poor self-stabilization stratum, it is very difficult to open the warehouse. If the warehouse is opened directly after precipitation, it is easy to cause the excavation surface to collapse and even cause the ground to subside; Reinforcement takes a long time and costs, and it also needs to occupy roads for enclosure, coordinate ground traffic, and relocate underground pipelines, etc.

These are extremely unfavorable to the shield opening operation

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