Secondary grouting slurry for large-diameter shield in water-rich sand layer and seal plug thereof

A water-rich sand layer and secondary grouting technology, which is applied in sealing/packing, wellbore lining, tunnel lining, etc., can solve the problems of short setting time, short durability of double liquid grout, and long time consumption, so as to improve construction Efficiency, saving construction cost and improving construction effect

Pending Publication Date: 2020-08-11
CHINA RAILWAY 14TH BUREAU GRP LARGE SHIELD ENG CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] (1) The slurry ratio is complex, the steps are cumbersome and time-consuming;
[0004] (2) The traditional double-liquid slurry (cement-sodium silicate) has a short setting time and high operation requirements, and pipe plugging is very easy to occur during the construction process;
[0005] (3) The effect of traditional double liquid slurry (cement-sodium silicate) on the floating of segments is average;
[0006] (4) The durability of traditional double liquid slurry (cement-water glass) in the formation is relatively short

Method used

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  • Secondary grouting slurry for large-diameter shield in water-rich sand layer and seal plug thereof

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Embodiment Construction

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0020] The main purpose of the secondary grouting is to promote the early stability of the segment and effectively control the floating of the segment. On the basis of the traditional secondary grouting, this project improves the grouting material and the plugging method of the grouting hole. The selection of grouting point, grouting pressure and volume are the same as the traditional secondary grouting.

[0021] (1) Single liquid slurry (cement slurry) slurry ratio

[0022] The cement slurry is composed of ordinary cement, super-early-...

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Abstract

The invention provides secondary grouting slurry for a large-diameter shield in a water-rich sand layer. The secondary grouting slurry for the large-diameter shield in the water-rich sand layer comprises common silicate cement, super-early strength sulfoaluminate cement and water. In the construction process of the secondary grouting slurry for the large-diameter shield in the water-rich sand layer, the labor investment is small, the construction process is simple and easy to operate, the durability is good, the control effect on upward movement of a segment is good, the construction cost is saved, the construction efficiency is improved, and the secondary grouting slurry is worthy of application and popularization in the water-rich sand layer.

Description

technical field [0001] The invention belongs to the technical field of shield tunneling, in particular to a secondary grouting slurry for large-diameter shield tunneling in water-rich sand layers and a sealing plug thereof. Background technique [0002] During the construction of the large-diameter shield tunnel in the water-rich sand layer, due to the large excavation diameter, the buoyancy force on the segment is much greater than the gravity of the shield segment itself, and the buoyancy of the segment is relatively large. By timely performing secondary grouting on the segments that come out of the tail of the shield, the setting time of synchronous grouting can be accelerated, the floating of the segments can be controlled within the allowable range, and water leakage caused by the floating of the segments can be avoided. The traditional secondary grouting injection is double liquid slurry (cement-sodium silicate), which has the following problems: [0003] (1) The slur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21B33/12C04B28/06C04B111/70
CPCC04B28/06C04B2111/70E21B33/12E21D11/10E21D11/105C04B22/00
Inventor 徐树军周昆陈宗凯刘四进刘继刚徐兆凯王军唐亚军庄绪良王硕娄瑞
Owner CHINA RAILWAY 14TH BUREAU GRP LARGE SHIELD ENG CO LTD
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