Light slurry for shield synchronous grouting

A synchronous grouting, lightweight technology, applied in the field of materials, can solve problems such as safety accidents, segment floating, loss, etc., to ensure the quality of the project, reduce the loss and save costs.

Inactive Publication Date: 2020-07-31
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] However, the problem of "segment floating" often occurs when grouting in the water-rich section of hard rock, which is likely to cause safety accidents and the quality of the tunnel is difficult to guarantee
The main reason for "segment floating" is that there is upward buoyancy in the segment itself in the water-rich section. The synchronous "mortar" slurry commonly used at present is mainly composed of "sand" (accounting for about 2 / 5 to 3 / 5 ), one of the biggest characteristics of synchronous mortar is that the bulk density is very large. After injection, it will quickly sink to the bottom of the segment. "chip floating" phenomenon

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0025] In terms of parts by weight, the light grout for shield grouting includes 250kg 42.5 grade ordinary silicon cement, 750kg first grade fly ash, 50kg 20 mesh expanded perlite particles (true density less than 0.60), 1.0kg polycarboxylate powder Body water reducing agent, 20kg coagulation agent, 10kg UWB-II type high resistance to dispersion polysaccharide flocculant and 650kg water.

[0026] The bulk density of light grout for shield grouting is 1400kg / m 3 , the initial setting time is 640min, and the final setting time is 800min; it does not disperse or segregate in water; the fluidity of 3h can still maintain 195mm and above; the 3d strength is 0.7MPa, and the 28d is greater than 2.5MPa. When constructing in the hard rock water-rich section , which can effectively prevent the floating phenomenon of segments caused by a large amount of slurry loss.

Embodiment 2～12

[0028] Examples 2-12 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.

[0029] The composition of each embodiment of light grout for shield tunneling grouting in table 1

[0030]

[0031] Table 2 The performance parameters of each embodiment of light grout for shield tunneling grouting

[0032]

[0033] As can be seen from Table 2, the 3d compressive strength of the lightweight slurry in water for shield tunneling grouting of the present invention can reach more than 0.5MPa, and the bulk density is 1120kg / m 3 ~1420kg / m 3 , The 3h flow performance remains above 195mm, which can meet the requirements of the synchronous grouting pump for the fluidity of the slurry. At the same time, it does not disperse, segregate, and bleed in water, and the stone rate is 100%.

[0034] Compared with the prior art, the lightweight grout for shield grouting...

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Abstract

The invention discloses light slurry for shield synchronous grouting. The light slurry comprises the following components in parts by weight: 200 to 300 parts of cement, 50 to 160 parts of light aggregate, 600 to 800 parts of fly ash, 1.0 to 1.6 parts of a water reducing agent, 10 to 16 parts of a flocculating agent, 15 to 25 parts of a thickening time control agent and 600 to 750 parts of water.Compared with the prior art, the volume weight of the light slurry for shield synchronous grouting is 1.0-1.4 kg/m<3>; the volume weight is far less than that of existing synchronous mortar, the lightslurry cannot will not quickly sink to a bottom cushion supporting pipe sheet or be taken away by the circulating slurry at the slurry discharge port below, thereby greatly reducing the loss amount after the synchronous slurry is injected, obviously improving the shield synchronous grouting effect, and effectively preventing the pipe sheets from floating upwards in the shield construction in a water-rich section. Besides, the light slurry for shield synchronous grouting is not dispersed in water, the 3d compressive strength in water can reach 0.5 MPa or above, the final setting time is shorter than 15 h, the light slurry is particularly suitable for filling building gaps between pipe sheets and surrounding rock in tunnel synchronous shield tunneling construction, and the engineering quality can be better guaranteed.

Description

technical field [0001] The invention belongs to the field of materials, and more specifically, the invention relates to a light grout for synchronous grouting of shield tunneling. Background technique [0002] At present, in tunnel shield excavation construction, the building gap between the segment and the surrounding rock must be filled with grouting slurry. (2) The condensed grout will be used as the first waterproof barrier of the shield 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, effectively It is beneficial to the control of the direction of shield tunneling and ensures the final stability of the shield tunnel. [0003] However, the problem of "segment floating" often occurs when grouting in the water-rich section of hard rock, which is likely to cause safety accidents and the quality of the tunnel is difficult to guarantee. The main reason for "segment f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/40C04B111/70
CPCC04B28/04C04B2111/40C04B2111/70C04B2201/20C04B2201/50C04B14/185C04B18/08C04B24/24C04B24/38C04B24/122C04B24/04C04B22/064
Inventor 崔学军杨宏波赵建光王辉诚史力生谢鸿辉刘文彬李继祖王恒周伟商宁宁李应川曹耀东周思强
Owner 中广核工程有限公司
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