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Backfill grouting double liquid and backfill grouting method

A technology of grouting and grouting behind the wall, which is used in earth-moving drilling, wellbore lining, tunnel lining, etc., can solve the problems of failure to achieve early strength, long cementation time, and inability to quickly suppress subsidence, and achieve difficult material separation, The effect of fast cementation and good fluidity

Inactive Publication Date: 2019-12-31
YANGTIE MACHINERY HANGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the ratio of cement slurry to water glass liquid used in domestic double-liquid grouting is 1:1. However, the cementing time required for this ratio of double-liquid grouting is longer, ranging from about 3 minutes to 3 hours, and cannot The subsidence is rapidly suppressed, and the post-grouting of the double liquid wall fails to achieve the required early strength (reaching 0.5kgf / cm within 1h 2 , and reach 8kgf / cm within 24h 2 )

Method used

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  • Backfill grouting double liquid and backfill grouting method
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  • Backfill grouting double liquid and backfill grouting method

Examples

Experimental program
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Effect test

Embodiment 1

[0070] Cement 230kg, bentonite 30kg, stabilizer 3kg and water 842kg are placed in mixing station, carry out mixing slurry making under the condition of 250rpmrpm, obtain A liquid; With described A liquid and B liquid (water glass 97kg) according to volume ratio 10: 1. Send them to the head of the shield machine through the above-ground grouting pump, and then input them to the grouting mixing system through the underground grouting pump for mixing and filling the shield tail gap.

[0071] According to the test method of GB / T50107-2010, the back grouting test body of embodiment 1 is carried out compressive strength measurement, and concrete results are shown in Table 1;

[0072] Carry out cementing time measurement to the grouting test body behind the wall of embodiment 1, the specific method is to pack A liquid and B liquid in two containers, calculate the time from the mixing of the two liquids, continue to dump alternately, and record the cementing time. For specific results,...

Embodiment 2

[0077] Cement 220kg, bentonite 30kg, stabilizer 3kg and water 848kg are placed in mixing station, under 250rpm condition, carry out mixing slurry making, obtain A liquid; With described A liquid and B liquid (water glass 97kg) according to volume ratio 10: 1. Send them to the head of the shield machine through the above-ground grouting pump, and then input them to the grouting mixing system through the underground grouting pump for mixing and filling the shield tail gap.

[0078] According to the test method of GB / T50107-2010, the back grouting test body of embodiment 2 is carried out compressive strength measurement, and concrete results are shown in Table 2;

[0079] Carry out cementing time measurement to the grouting test body behind the wall of embodiment 2, the specific method is to put A liquid and B liquid in two containers, calculate the time from the mixing of the two liquids, continue to dump alternately, record the cementing time, the specific results are shown in ...

Embodiment 3

[0083] 240kg of cement, 30kg of bentonite, 3kg of stabilizer and 836kg of water are placed in the mixing station, and mixed and slurryed under the condition of 250rpm to obtain liquid A; the liquid A and liquid B (water glass 104kg) are mixed according to the volume ratio of 10:1 They are sent to the head of the shield machine through the above-ground grouting pump, and then input to the grouting mixing system through the underground grouting pump for mixing and filling the shield tail gap.

[0084] According to the test method of GB / T50107-2010, the back grouting test body of embodiment 3 is carried out compressive strength measurement, and concrete results are shown in Table 3;

[0085] Carry out cementing time measurement to the grouting test body behind the wall of embodiment 3, the specific method is to pack A liquid and B liquid in two containers, calculate the time from the mixing of the two liquids, continue to dump alternately, record the cementing time, the specific r...

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Abstract

The invention belongs to the technical field of grouting in shield machines and in particular relates to a backfill grouting double liquid and a backfill grouting method. The cementing speed of the backfill grouting double liquid is high, and the backfill grouting double liquid can rapidly provide early strength (the compressive strength reaches 0.5 kgf / cm2 within 1 h, and the compressive strengthreaches 8 kgf / cm2 within 24 h). The the compressive strength of the backfill grouting double liquid can reach 0.6-1.1 kgf / cm2 within 1 h and can reach 9-13 kgf / cm2 within 24 h. The cementing time ofthe backfill grouting double liquid after being mixed is 8-15 s and is obviously less than the cementing time (3 min-3h) of an existing double liquid. Compared with single liquid synchronous grouting,the grouting of the cemented backfill grouting double liquid is harder to generate material separation.

Description

technical field [0001] The invention relates to the technical field of grouting in a shield machine, in particular to a double-liquid grouting behind the wall and a grouting method behind the wall. Background technique [0002] At present, with a large number of subway constructions at home and abroad, tunnel shield machine excavation has gradually become the main means of urban underground construction by virtue of its own advantages. During the propulsion process of the shield machine, when the tail of the shield is separated from the segment, since the diameter of the excavation surface of the cutter head is larger than the outer diameter of the segment, there will be a gap between the segment and the tunnel stratum. If the gap is not backfilled in time, it will inevitably Causing stratigraphic changes that can have destructive effects on adjacent subterranean structures. Existing shield machines usually use synchronous grouting to suppress formation settlement and preve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/38C04B28/26
CPCC04B28/26E21D11/105E21D11/38C04B7/00C04B14/104C04B2103/22
Inventor 刘启成
Owner YANGTIE MACHINERY HANGZHOU CO LTD
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