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Light slurry for shield grouting

A lightweight, slurry technology, applied in the field of tunnel shield materials, can solve the problems of difficulty in guaranteeing tunnel quality, "segment floating, safety accidents, etc."

Active Publication Date: 2019-02-22
中广核工程有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The problem of "segment floating" often occurs when grouting in the water-rich section of hard

Method used

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  • Light slurry for shield grouting
  • Light slurry for shield grouting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The lightweight slurry includes the following parts by weight: 300kg 42.5 grade high belite sulfoaluminate cement (A), 250kg 20 mesh hydrophobic expanded perlite particles (true density less than 0.60), 20kg specific surface area of ​​20000m2 2 / kg silicon powder, 1.5kg polycarboxylate powder water reducer (Q), 15kgUWB-II type high anti-dispersion polysaccharide flocculant (H) and 500kg water.

[0029] The resulting light slurry has a bulk density of 610kg / m 3 , the initial setting time is 210min, the final setting time is 230min, it can float in water; it does not disperse, segregate, and precipitate in water; it can solidify rapidly in water; the early strength is high, and the 1d strength is 1.2MPa, which is rich in water in hard rock During section construction, the segments did not float up.

Embodiment 2～13

[0031] Examples 2-13 are basically the same as Example 1, except that the components of each substance are different, and the specific parameters and performance results are shown in Table 1 and Table 2.

[0032] Table 1 each embodiment light slurry raw material composition

[0033]

[0034] A: 42.5 grade high Belite sulfoaluminate cement; B: 42.5 grade ordinary Portland cement; C: 42.5 grade rapid hardening sulfoaluminate cement; D: 52.5 grade high Belite sulfoaluminate cement; E: 42.5R grade Portland cement;

[0035] H: UWB-II high dispersion-resistant polysaccharide flocculant; I: polypropylene flocculant; J: cellulose ether flocculant;

[0036] Q: polycarboxylate powder water reducer; R: melamine water reducer; S: sulfamate water reducer; T: naphthalene type water reducer.

[0037] Table 2 each embodiment lightweight slurry performance parameter

[0038]

[0039] It can be seen from Table 2 that the obtained light slurry can have a compressive strength of more tha...

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Abstract

The invention discloses light slurry for shield grouting. The light slurry is prepared from the following components in parts by weight: 300-400 parts of cement, 150-250 parts of light aggregate, 10-20 parts of silicon powder, 1.2-2.4 parts of a water reducer, 10-15 parts of a flocculating agent and 375-500 parts of water. Compared with the prior art, the light slurry for shield grouting can floatin water, is not dispersed, is free of segregation and does not precipitate in water and is controllable in condensation time, the 1d strength is greater than 1 MPa, and during construction at a hard-rock water-rich section, a duct piece does not float up.

Description

technical field [0001] The invention belongs to the field of tunnel shield materials, and more specifically, the invention relates to a light grout for shield grouting. Background technique [0002] In tunnel shield excavation construction, the building gap between the segment and the surrounding rock must be filled with grouting slurry. The purpose of grouting is: (1) Fill the building gap at the end of the shield in time, support the rock mass around the segment, and control the surface settlement ; (2) The condensed slurry will be used as the first waterproof barrier of the shield construction tunnel to enhance the waterproof ability of the tunnel; (3) Provide early stability for the segment and integrate the segment with the surrounding rock mass, which is beneficial to shield construction. It can control the tunneling direction and ensure the final stability of the shield tunnel. [0003] The problem of "segment floating" often occurs when grouting in the water-rich se...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B111/70
CPCC04B28/06C04B2111/00146C04B2111/00724C04B2111/70C04B2201/50C04B14/185C04B18/146C04B24/38C04B2103/302
Inventor 崔学军杨宏波肖术芳赵建光史力生王辉诚任延宝易明雄谢鸿辉刘文彬王镇江沈卫明郭县华周伟曹耀东李应川和丽钢
Owner 中广核工程有限公司