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Early-strength shield wall post-grouting formula

A shield wall and post-grouting technology is applied in the field of grouting formula, post-grouting of early-strength shield wall, and post-grouting formula of early-strength shield wall. The problems of long time and the floating of segments can achieve the effect of short coagulation time, good fluidity and fast coagulation speed.

Active Publication Date: 2018-04-13
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unfavorable working conditions such as long coagulation time in the early stage of the single-liquid slurry cause formation deformation, poor fluidity make it difficult to clean the plugged pipe, and low early strength cause the segment to float up and cause damage. These are important problems that plague engineers and need to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An early-strength type grouting formula for the back of the shield wall, which consists of mixing various materials by weight: 800 parts by weight of 150-mesh quartz sand, 40 parts by weight of 200-mesh sodium-based bentonite, and 110 parts by weight of F class II fly ash 460 parts by weight of Portland cement, 80 parts by weight of gypsum, 5 parts by weight of early strength agent, 10 parts by weight of organic additives, and 400 parts by weight of water.

[0035] Among them, the early strength agent includes triethanolamine, sodium chloride and calcium formate, and the weight ratio of triethanolamine, sodium chloride and calcium formate is 1:1.2:0.8; the organic additive includes methylphenyl silicone resin, calcium stearate and The weight ratio of microcrystalline cellulose, methylphenyl silicone resin, calcium stearate and microcrystalline cellulose is 1:0.8:0.6; the stirring time is 4 minutes, the grouting pressure is about 0.6MPa, and the grouting flow rate is 100L...

Embodiment 2

[0044]An early-strength type grouting formula for the back of the shield wall, which is prepared by mixing various materials by weight: 900 parts by weight of 200-mesh quartz sand, 35 parts by weight of 200-mesh sodium-based bentonite, and 170 parts by weight of class F and class II fly ash 400 parts by weight of ordinary Portland cement, 70 parts by weight of anhydrous gypsum, 2.4 parts by weight of triethanolamine, 1.92 parts by weight of calcium formate, 2.88 parts by weight of sodium chloride, 7.2 parts by weight of early strength agent, 6.67 parts by weight of methylphenyl silicone resin parts by weight, 5.33 parts by weight of calcium stearate, 4 parts by weight of microcrystalline cellulose, and 540 parts by weight of water. The stirring time is 4 minutes, the grouting pressure is about 0.6MPa, the grouting flow rate is about 100L / min, the four-point grouting up and down ratio is 6.5:3.5, and the injection rate is 140%.

[0045] The slurry density prepared by this formu...

Embodiment 3

[0047] An early-strength type grouting formula for the back of the shield wall, including mixing various materials by weight: 1,000 parts by weight of 180-mesh quartz sand, 50 parts by weight of 200-mesh sodium-based bentonite, and 220 parts by weight of Class F and Class II fly ash 600 parts by weight of ordinary Portland cement, 100 parts by weight of anhydrite, 8 parts by weight of early strength agent, 20 parts by weight of methylphenyl silicone resin, and 600 parts by weight of water; wherein, the early strength agent includes triethanolamine, chlorine Sodium chloride and calcium formate, the weight ratio of triethanolamine, sodium chloride and calcium formate is 1:1.2:0.8.

[0048] Among them, the stirring time is 4 minutes, the grouting pressure is about 0.6MPa, the grouting flow rate is about 100L / min, the four-point grouting up and down ratio is 6.5:3.5, and the injection rate is 140%.

[0049] The slurry density prepared by this formula is 1.91g / cm 3 , the fluidity ...

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Abstract

The invention belongs to the field of underground construction, and particularly discloses an early-strength shield wall post-grouting formula. The early-strength shield wall post-grouting formula comprises the following substances in parts by weight: 800 to 1000 parts of fine sand, 35 to 50 parts of bentonite, 110 to 220 parts of coal ash, 400 to 600 parts of Portland cement, 70 to 100 parts of gypsum, 5 to 8 parts of an early strength agent and 400 to 600 parts of water. The early-strength shield wall post-grouting formula has relatively high condensation rate, and also has the characteristic of high early strength; and moreover, the long-term strength and shear resistance of the grouting are further effectively guaranteed, ground deformation and duct piece floating are controlled, and the damage of duct pieces is reduced.

Description

technical field [0001] The invention belongs to the field of underground engineering, and relates to a grouting formula, in particular to a grout suitable for post-grouting of an early-strength type shield wall in gravel sand formations, in particular to an early-strength type post-injection grout for a shield wall pulp recipe. Background technique [0002] At present, grouting behind the wall has become an indispensable work content in shield tunneling construction. The grouting behind the wall is to pump the liquid phase grouting material into the annular shield tail hole behind the segment, so as to reduce the stress release and deformation of the formation. Therefore, ideally, the grout should maintain the same physical properties and state. As shield tunnels pass through strata more and more complex, the grout often cannot reach the physical and mechanical state consistent with the stratum in a short period of time, and the resulting stratum deformation accounts for a...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/20C04B2201/50C04B14/06C04B14/104C04B18/08C04B22/143C04B24/42C04B24/04C04B24/122C04B22/124
Inventor 闵凡路宋航标马佳伟刘来仓杜瑞柏煜新
Owner HOHAI UNIV
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