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A kind of retaining wall mud for underground diaphragm wall of deep and large foundation pit in round gravel formation and its configuration method

An underground continuous wall and stratum technology, applied in chemical instruments and methods, fertilization devices, agriculture, etc., can solve the problem that specific gravity, pH value, viscosity stability are easily affected by groundwater, unfavorable environmental protection, and can not effectively ensure the stability of the tank wall. and other problems, to achieve the effects of improved slurry wall protection performance and slurry recycling rate, reduced environmental pollution and material consumption, and good tank wall stability.

Active Publication Date: 2021-04-09
CHINA TIESIJU CIVIL ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the traditional muds that are widely used use CMC (sodium carboxymethyl cellulose) as a thickener. The index of this kind of traditional mud is far from meeting the requirements of the retaining wall of "deep and large foundation pit underground diaphragm wall". Shrinkage cavity or local collapse of the tank wall is prone to occur, and common quality problems such as mud and sand inclusions at the wall joints are prone to water leakage
In addition, in the poor self-stability and strong water permeability such as round gravel formations, the stability of the specific gravity, PH value, viscosity and other indicators of traditional mud are also easily affected by groundwater. During the construction of the trough, the stability of the trough wall will not be effectively guaranteed
At the same time, traditional mud also has the problem of high waste slurry rate, which is not conducive to environmental protection

Method used

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  • A kind of retaining wall mud for underground diaphragm wall of deep and large foundation pit in round gravel formation and its configuration method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] The mud for retaining wall of the underground diaphragm wall of a deep and large foundation pit in a round boulder formation includes the following raw materials in parts by weight: 1000 parts of water, 75 parts of bentonite, 3 parts of soda ash, and 0.5 part of sodium polyacrylate.

[0035] Among them, the raw water comes from the groundwater extracted by drilling, pH 6, and used after passing the test; the soda ash is industrial soda ash, which is mixed with raw water, and the pH is 8; the sodium polyacrylate is food-grade sodium polyacrylate used as a thickener.

Embodiment 2

[0037] A kind of slurry for retaining walls of underground diaphragm walls of deep and large foundation pits in round boulder formations in this embodiment includes the following raw materials in parts by weight: 1000 parts of water, 85 parts of bentonite, 5 parts of soda ash, and 1.5 parts of sodium polyacrylate.

[0038] Among them, the raw water comes from the groundwater extracted by drilling, pH 7, and used after passing the test; industrial soda ash is used, and the pH is 10 after mixing with raw water; sodium polyacrylate is food-grade sodium polyacrylate used as a thickener.

Embodiment 3

[0040] The mud for retaining wall of the underground diaphragm wall of a deep and large foundation pit in a round boulder formation comprises the following raw materials in parts by weight: 1000 parts of water, 80 parts of bentonite, 4 parts of soda ash, and 1 part of sodium polyacrylate.

[0041] Among them, the raw water comes from the groundwater extracted by drilling, pH 6.5, and is used after passing the test; industrial soda ash is used, and the pH is 9 after being mixed with raw water; sodium polyacrylate is food-grade sodium polyacrylate used as a thickener.

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Abstract

The invention relates to the field of building construction, and provides a mud for retaining wall of an underground diaphragm wall of a deep and large foundation pit in a round boulder formation, which comprises the following raw materials in parts by weight: 1000 parts of water, 75-85 parts of bentonite, 3-5 parts of soda ash, and polyacrylic acid Sodium 0.5‑1.5 parts. The invention also provides a method for configuring the slurry for the retaining wall of the underground diaphragm wall of the deep and large foundation pit in the round gravel formation. The advantage of the present invention is that: the present invention adopts sodium polyacrylate to replace traditional CMC, and its slurry retaining wall performance and slurry recycling rate will be greatly improved, and at the same time, corresponding environmental pollution and material consumption are reduced; at the same time, it is prepared according to the formula of the present invention The various indexes of the obtained mud can meet the requirements of the circulating mud index, the effect of wall protection is good, and the stability of the groove wall is good.

Description

technical field [0001] The invention relates to the field of building construction, in particular to an underground diaphragm wall retaining mud for deep and large foundation pits in round gravel formations and a configuration method thereof. Background technique [0002] The underground diaphragm wall has the advantages of mature technology, high rigidity, good integrity, and good water-stop effect. In recent years, it has become a widely used form of enclosure structure in the construction of various foundation pits. During the trench construction of the underground diaphragm wall, the retaining mud will be deposited on the surface of the trench wall to form a mud skin, so that the trench wall is protected. At the same time, the water and soil pressure of the mud and soil layer in the tank is balanced, and the tank wall remains stable and does not collapse. [0003] For the underground diaphragm wall of deep and large foundation pits, due to the large depth of the grooves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K103/00
CPCC09K17/40C09K2103/00
Inventor 王进卢治仁梁超王圣涛陆跃孙超魏兆雷罗丁晟付乔郭可飞成帅程亚斌杨富
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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