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Water-dispersion-resistant slurry with controllable initial setting time for shield synchronous grouting and preparation method

A technology of anti-water dispersion and initial setting time, applied in the field of shield tunnel construction building materials, can solve the problems of low late strength and long initial setting time, and achieve the effects of improving late strength, good water retention and simple preparation method

Active Publication Date: 2019-08-30
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a grouting grout that is suitable for high-permeability water-rich formations and has controllable initial setting time in order to overcome the shortcomings of the existing shield tunnel cellulose ether modified synchronous grouting slurry with long initial setting time and low later strength. Synchronous grouting slurry for shield tunneling and its preparation method

Method used

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  • Water-dispersion-resistant slurry with controllable initial setting time for shield synchronous grouting and preparation method

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Embodiment 1

[0032] A preferred embodiment of the present invention provides a shield water-resistant dispersion synchronous grouting slurry with controllable initial setting time. The specific preparation steps are as follows:

[0033] First, take each raw material component according to the following mixing ratio, and the dosage per unit volume (kg / m3) is as follows: cement 240, fly ash 300, water 432, sand 775, hydroxyethyl methylcellulose 0.33, calcium formate 75.5, except Materials other than water are in powder or granular form.

[0034] Among them, the cement used is ordinary Portland cement with the label P.O 42.5 produced by Sichuan Lanfeng Cement Co., Ltd.; ) 20%-45%, water content ≤ 5%; the sand is river sand in Chengdu area, fineness modulus 2.2-2.8, particle size <5mm; the hydroxyethyl methylcellulose used is Shandong Youso Chemical Technology Co., Ltd. The parameters produced by the company are hydroxyethyl methylcellulose with a viscosity of 10W and a purity greater than 98...

Embodiment 2

[0037] A preferred embodiment of the present invention provides a shield water-resistant dispersion synchronous grouting slurry with controllable initial setting time. The specific preparation steps are as follows:

[0038]First, weigh each raw material component according to the following mixing ratio, and the dosage per unit volume (kg / m3) is as follows: cement 240, fly ash 300, water 432, sand 775, hydroxyethyl methylcellulose 0.33, other materials except water All in powder or granular form.

[0039] Among them, the cement used is ordinary Portland cement with the label P.O 42.5 produced by Sichuan Lanfeng Cement Co., Ltd.; ) 20%-45%, water content ≤ 5%; the sand is river sand in Chengdu area, fineness modulus 2.2-2.8, particle size <5mm; the hydroxyethyl methylcellulose used is Shandong Youso Chemical Technology Co., Ltd. The parameters produced by the company are hydroxyethyl methylcellulose with a viscosity of 10W and a purity of more than 98%, which is white or off-wh...

Embodiment 3

[0042] A preferred embodiment of the present invention provides a shield water-resistant dispersion synchronous grouting slurry with controllable initial setting time. The specific preparation steps are as follows:

[0043] First, take each raw material component according to the following mixing ratio, and the dosage per unit volume (kg / m3) is as follows: cement 240, fly ash 300, water 432, sand 775, hydroxyethyl methylcellulose 0.33, calcium formate 55, except Materials other than water are in powder or granular form.

[0044] Among them, the cement used is ordinary Portland cement with the label P.O 42.5 produced by Sichuan Lanfeng Cement Co., Ltd.; ) 20%-45%, water content ≤ 5%; the sand is river sand in Chengdu area, fineness modulus 2.2-2.8, particle size <5mm; the hydroxyethyl methylcellulose used is Shandong Youso Chemical Technology Co., Ltd. The parameters produced by the company are hydroxyethyl methylcellulose with a viscosity of 10W and a purity greater than 98%,...

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Abstract

The invention discloses water-dispersion-resistant slurry with controllable initial setting time for shield synchronous grouting and a preparation method. The slurry is prepared from the following rawmaterials in parts by mass: 400-500 parts of water, 200-300 parts of cement, 200-500 parts of coal ash, 600-900 parts of sand, 0.1-2.0 parts of hydroxyethyl methyl cellulose and 0-100 parts of calcium formate. According to the water-dispersion-resistant slurry with controllable initial setting time for shield synchronous grouting and the preparation method, the requirement of water dispersion resistance of synchronous grouting in a high-permeability water-rich stratum can be realized, and particularly the slurry initial setting time and compressive strength in a shield synchronous grouting process can be controlled, so that the slurry initial setting time requirements matched with aspects of different stratum conditions, shield excavation, duct piece assembling speed, grouting equipment performance and the like in engineering practice are met.

Description

technical field [0001] The invention belongs to the field of building materials for shield tunnel construction, and in particular relates to a shield tunnel water-resistant dispersion synchronous grouting slurry with controllable initial setting time and a preparation method thereof. Background technique [0002] As an important process for filling the shield tail gap and stabilizing the formation, the grout required in the synchronous grouting process must have good fluidity, stability, small fluidity loss over time, and reasonable setting time. However, during the construction of shield tunnels in recent years, water-rich environments such as high-permeability formations, water-rich karst environments, and water-rich rock formations with developed fractures are often encountered. Because ordinary synchronous grouting grouts are prone to problems such as segregation, loss of cementitious materials, uncompacted gels or even voids, and insufficient durability under the condit...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/27C04B18/08C04B24/383C04B24/04C04B14/06
Inventor 王士民阮雷陈兵王先明鲁茜茜蹇蕴奇
Owner SOUTHWEST JIAOTONG UNIV
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