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A method for efficient excavation of earth pressure shield machine in water-rich round gravel stratum

A technology of shield machine and round gravel, which is used in earthwork drilling, underground chamber, wellbore lining, etc., can solve the problems of large land subsidence, slurry loss, tool wear, etc. effect of life

Active Publication Date: 2017-06-13
CHINA TUNNEL CONSTR GUANGDONG
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Problems solved by technology

Shield construction in water-rich boulder formations will face construction risks such as severe tool wear, serious slurry loss, large ground subsidence, and gushing

Method used

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  • A method for efficient excavation of earth pressure shield machine in water-rich round gravel stratum

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Embodiment Construction

[0024] refer to figure 1 , the present invention is a kind of earth pressure shield machine the method for efficient excavation in water-rich boulder stratum, comprises the following steps:

[0025] 1) The main drive of the cutter head of the earth pressure balance shield machine 7 is hydraulic drive, the maximum torque of the shield machine 7 is not less than 6228 kNm to adapt to the excavation in the water-rich boulder formation 5, and the escape torque of the shield machine 7 is not Less than 7447kNm, the opening rate of the cutter head of the shield machine 7 is 20% to 30%;

[0026] 2), the shield machine 7 adopts wear-resistant protection methods including surfacing, wear-resistant protection, burning wear-resistant welding, welding wear-resistant protection blocks, and welding carbide strips to protect the cutter head, cutter, knife box, cutter head nozzle and Screw machine to increase service life;

[0027] 3) The shield machine 7 adopts three different improvement te...

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Abstract

The invention discloses a method of an earth pressure shield machine tunnelling in high efficiency in the water-rich round gravel stratum, which includes the following steps: reasonably designing the shield machine main drive, the cutting tool diameter and the aperture ratio; performing the wear-resistant protection to a cutterhead, a cutting tool, a cutting tool box, a nozzle of the cutterhead and a screw conveyor; adopting various muck improving technologies to improve the muck in the water-rich round gravel stratum; adopting a twin screw conveyor for the shield machine to decompress so that a good deslagging effect can be achieved; controlling the tunnelling parameter of the shield machine in the process of the shield so that the problem that the settling of the shield machine in the water-rich round gravel stratum is solved; adopting the synchronous grouting and the complementary grouting behind the segment wall to control the settling of the segment, the phenomena of the serious tool wear, the ground substantial settling, spewing and the like are reduced, and the method of the earth pressure shield machine tunnelling in high efficiency in the water-rich round gravel stratum is used in the field of a shield construction method.

Description

technical field [0001] The invention relates to a shield construction method, in particular to an efficient excavation method of an earth pressure shield machine in a water-rich round gravel stratum. Background technique [0002] The topography of Nanning City is a basin shape centered on the broad valley of the Yongjiang River. The geomorphology is distinguished according to the distribution map of geomorphology and external dynamic geological phenomena in the "Geological Series Atlas of Nanning City, Guangxi Zhuang Autonomous Region". It belongs to the second-order stage on the north bank of the Yongjiang River. The underlying bedrock is Lower Tertiary mudstone, silty mudstone, argillaceous siltstone, and siltstone. There are many round gravel layers in Nanning area and the groundwater is abundant. The round gravel strata are gray, off-white, yellow, etc., slightly dense to medium dense, partially dense, saturated, mainly gravel, and a small part of pebbles, particle size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/08E21D9/04E21D9/12E21D11/10
CPCE21D9/001E21D9/06E21D9/12E21D11/10
Inventor 赖伟文郭清华何伦王星钧王科伟陈章王法茗郑浩张英强
Owner CHINA TUNNEL CONSTR GUANGDONG
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