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

A construction method and backfilling technology, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of stratum fissure development, large permeability coefficient, and inability to reinforce the ground, and achieve small disturbance, ensure safety, and high efficiency Effect

Active Publication Date: 2012-07-04
GUANGZHOU RAIL TRANSIT CONSTR SUPERVISION CO LTD
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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

Method used

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

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Embodiment Construction

[0047] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following embodiments.

[0048] like Figure 1 to Figure 5 As shown, the construction method of the present invention is realized through the following steps:

[0049] (1) Judging the geological conditions of the tool change position of the shield machine. According to the geological survey data and the dreg samples excavated by the shield machine (such as: the percentage of the dreg samples containing granite rock blocks in the total dreg samples, the shape of the dreg samples; the total amount of non-granite dreg samples) to determine whether to use backfilling Soil warehouse method enters the warehouse for construction work.

[0050] (2) First, use the radial hole 16 reserved by the shield machine itself to fill its surroundings with bentonite, and the mix ratio is 260Kg / ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06E21D11/10
Inventor 竺维彬梁红兵黄威然王晖米晋生钟长平廖鸿雁鞠世健叶建兴
Owner GUANGZHOU RAIL TRANSIT CONSTR SUPERVISION CO LTD
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