Construction method of earth cabin back filling and cabin entering operation during earth pressure shielding

Abstract

The invention discloses a construction method of earth cabin back filling and cabin entering operation during earth pressure shielding. The construction method comprises the following steps: (1) injecting bentonite slurry outside the casing of a shield machine; (2) injecting polyurethane outside the body of a shield to form a seal ring; (3) injecting two-liquid slurry outside a tube piece to form a seal ring; (4) replacing muck in an earth cabin with bentonite, and carrying out muck replacement through the cooperation of the a bentonite injection system and a spiral conveyer; (5) carrying out pressure injecting on low, middle and high-strength cement bentonite mortar slurry, and allowing the bentonite slurry in the earth cabin to form cumulates with certain strength; (6) injecting slurry to a cutting ring of the shield machine and the top of a cutter head; (7) carrying out cabin entering operation by constructors; and (8) closing an earth cabin door after cutter replacement is completed, injecting and back-filling bentonite to the earth cabin to establish an earth pressure balanced mode to restore tunneling. The construction method disclosed the invention breaks through the difficulty of cabin entering operation below a special unstable formation and the difficulty of cabin entering operation under a building during shielding, and has the characteristics of high efficiency, strong operability and the like.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to a construction method for an earth pressure balance shield machine (earth pressure shield machine for short) backfilling a soil bin into a bin. Background technique [0002] The shield tunneling method is the mainstream construction method for tunnel construction in soft soil, and it is widely used in the construction of urban subway projects. Most of them are earth pressure shield machines. During shield construction, tools are used to cut rock and soil, so construction workers need to enter the soil bin to replace worn tools. The operation method of entering the warehouse generally includes: entering the warehouse under normal pressure, entering the warehouse after strengthening the formation, and entering the warehouse under air pressure. [0003] First, normal pressure tool change. That is to say, under the condition that the self-stability of the gr...

AI Technical Summary

Problems solved by technology

The disadvantage of pneumatic work is that conventional hot work cannot be used

[0006] But there is still a fourth situation, neither ground reinforcement nor air pressure into the warehouse can be implemented, such as the development of stratum fissures and high permeability coefficient

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