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

A technology that resists water dispersion and initial setting time is applied in the field of shield tunnel construction building materials, which can solve the problems of long initial setting time and low late strength, and achieve the effects of good water retention, improved late strength and low bleeding rate.

Active Publication Date: 2020-05-05
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

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  • Water-resistant and dispersed synchronous grouting slurry for shield tunneling with controllable initial setting time and its 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 a shield water-resistant dispersion synchronous grouting slurry with controllable initial setting time and a preparation method, which comprises the following raw materials in parts by mass: 400-500 parts of water, 200-300 parts of cement, and 200-parts of fly ash 500 parts, 600-900 parts of sand, 0.1-2.0 parts of hydroxyethyl methylcellulose, 0-100 parts of calcium formate. The invention can realize the anti-water dispersion performance requirements of synchronous grouting in high-permeability water-rich formations, especially the control of initial setting time and compressive strength of grout in the process of synchronous grouting of shield tunneling can be realized through the invention, so as to solve the problem of different formations in engineering practice The initial setting time requirements of grout are adapted to the conditions, shield tunneling and segment assembly speed, and performance of grouting equipment.

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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Patent Type & Authority Patents(China)
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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