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Construction method for ultralarge-diameter shield synchronous grouting

A synchronous grouting and ultra-large diameter technology, which is applied in earthwork drilling, wellbore lining, tunnel lining, etc., can solve the problems of high grouting cost, short grout setting time, easy blockage, etc., and achieve better balance and higher construction efficiency effect on construction quality

Active Publication Date: 2012-10-31
SHANGHAI URBAN CONSTR GRP +2
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AI Technical Summary

Problems solved by technology

In the past, in the construction process of large-diameter shield tunnels with a diameter of about 11m, the synchronous grouting construction method generally adopts the double-liquid grouting method of mixing cement slurry and water glass. It has high strength, certain anti-seepage and anti-seepage effects, and can better control the initial settlement and stability of the tunnel. However, there are the following shortcomings when using the double-liquid synchronous grouting construction method in China: easy to block, high requirements for operation control ; The amount of grouting is about 180-250% of the theoretical value, and the cost of grouting is relatively high; if the grouting is not in place, it will easily cause the surface to subside, and secondary grouting is usually used

Method used

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  • Construction method for ultralarge-diameter shield synchronous grouting
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  • Construction method for ultralarge-diameter shield synchronous grouting

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with specific examples.

[0037] A construction method for synchronous grouting of a super-large diameter shield tunnel of the present invention comprises the following steps:

[0038] First, produce and prepare slurry materials;

[0039] A stirring system receives a command from a control room and starts;

[0040] The mixing system weighs each raw material according to the ratio of the fixed volume slurry material; the raw materials include bentonite, fly ash, slaked lime, cement and sand according to the feeding order; in the mixing step, when the raw materials are mixed evenly, add water and Aqua.

[0041] According to the preset feeding sequence, each weighed raw material is sequentially added to a mixer and stirred to form a slurry material;

[0042] The slurry material is loaded into a ground container and the next mixing of a fixed volume of slurry material is performed. Performance testing ...

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Abstract

The invention discloses a construction method for ultralarge-diameter shield synchronous grouting. The construction method comprises the following steps of: producing and preparing a slurry material, and conveying the slurry material to a shield construction working face in a tunnel; carrying out instant grouting on a building gap by using a grouting system in a shield excavation process; and treating a waste slurry material. Due to adoption of the construction method for ultralarge-diameter shield synchronous grouting, a synchronous grouting construction method which can play a favorable quality control effect can be achieved; and the construction method for ultralarge-diameter shield synchronous grouting has the characteristics of high construction efficiency, capability of protecting the surrounding environment and strong stability of a ring-forming tunnel structure.

Description

technical field [0001] The invention relates to a construction method, in particular to a construction method for synchronous grouting of a super-large-diameter shield tunnel. Background technique [0002] During tunnel excavation construction using the shield method, synchronous grouting is the main means to control the surrounding soil disturbance and the stability of the ring tunnel structure, and it is also a key process in the shield tunneling construction. During the shield tunneling construction, it is required that the grouting should be injected in a timely, uniform and sufficient amount to ensure that the building voids are filled in a timely and sufficient amount, and thereby minimize the surface deformation and segment offset. [0003] Due to the large excavation volume, the construction of shield tunnels with a super large diameter, that is, shield tunnels with a diameter of 15m or more, will cause greater disturbance to the surrounding soil, and at the same tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
Inventor 郑宜枫黄俊曹文宏段创峰杨志豪巴雅吉乎魏林春张冠军顾沉颖
Owner SHANGHAI URBAN CONSTR GRP
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