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Slurry suitable for large-diameter shield tunnel synchronous grouting

A technology of shield tunneling and simultaneous grouting, applied in tunnels, tunnel linings, wellbore linings, etc., can solve the problems of high later strength, short setting time, and rapid early strength growth, etc., and achieves easy quality, low cost, and preparation method. simple effect

Inactive Publication Date: 2018-08-24
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of synchronous grouting grout in the construction of existing shield tunnels, the present invention provides a synchronous grouting grout suitable for large-diameter shield tunnels. It has high strength in the later stage, and has the advantages of not easy to segregate and block pipes, etc., and has a good effect on the settlement control of large-diameter shield tunnels

Method used

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  • Slurry suitable for large-diameter shield tunnel synchronous grouting

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Effect test

Embodiment 1

[0026] In said A liquid, the weight ratio (Kg / m3) of each raw material component 3 ) is: cement: 700; water 630; mud: 180; retarder: 35.

[0027] The bleeding rate of the liquid A is 3.5%, the fluidity is not less than 210mm, the coagulation time after the liquid A and the liquid B are mixed is 18.6s, and the 28d compressive strength is 23.1MPa.

Embodiment 2

[0029] In said A liquid, the weight ratio (Kg / m3) of each raw material component 3 ) is: cement: 650; water 650; mud: 130; retarder: 13.

[0030] The bleeding rate of the liquid A is 4.3%, the fluidity is not less than 240mm, the coagulation time after the liquid A and the liquid B are mixed is 17.3s, and the 28d compressive strength is 22.3MPa.

Embodiment 3

[0032] In said A liquid, the weight ratio (Kg / m3) of each raw material component 3 ) is: cement: 700; water 560; mud: 210; retarder: 14.

[0033] The bleeding rate of the liquid A is 3.1%, the fluidity is not less than 230mm, the coagulation time after the liquid A and the liquid B are mixed is 16.4s, and the 28d compressive strength is 24.5MPa.

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Abstract

The invention relates to slurry suitable for large-diameter shield tunnel synchronous grouting. The slurry is composed of liquid A and liquid B, wherein the usage volume ratio of the liquid A to the liquid B is 10:1, the weight ratio of raw materials of cement to water to mud to a retarder in the liquid A is 1: (0.8-1.2): (0.1-0.5): (0.01-0.05), the liquid B is water glass with Baume degree of 30,and the liquid A and the liquid B are mixed to obtain the slurry. A preparation method of the slurry is simple, the mass of the slurry is easy to control, the cost of the ingredients is low, and goodeconomic and social benefits are achieved. The setting time of the slurry is short and is between 15s-20s, the early strength increases rapidly, and the later strength is high, the slurry has the advantages of being not prone to segregating and blocking pipes, and has a good effect on settlement control of large-diameter shield tunnels.

Description

technical field [0001] The invention belongs to the technical field of building materials for shield tunnel construction, and in particular relates to a synchronous grouting grout suitable for large-diameter shield tunnels. Background technique [0002] During shield excavation, since the outer diameter of the cutter head and shield shell is larger than that of the lining segment, a certain construction gap will be formed between the segment and the surrounding soil after the segment is pulled out of the shield tail. The shield synchronous grouting technology refers to injecting an appropriate amount of grouting material into the gap of the shield tail under a certain pressure at the same time when the segment is out of the shield tail, so as to fill the building gap behind the wall in time, so as to prevent the formation damage caused by the shield tunneling construction. The formation of settlement is effectively controlled, and the grouting construction is convenient, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/06E21D11/10
CPCE21D9/0607E21D11/10
Inventor 袁大军韩冰宇李兴高金大龙王将毛家骅王滕
Owner BEIJING JIAOTONG UNIV
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