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Soft-soil area underground diaphragm wall supporting slurry and method of determining slurry ratio thereof

A technology of underground diaphragm wall and determination method, which is applied in excavation, sheet pile wall, construction and other directions, can solve the problems of high difficulty in determining mud plan, unstable construction quality, low stability of groove wall, etc., and achieves enhanced protection and reduced The possible effect of collapsing walls and reducing the occurrence of hazards

Inactive Publication Date: 2019-04-05
BEIJING NO 3 CONSTR ENG
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide mud for retaining wall of underground diaphragm wall in soft soil area and its construction method, to solve the problem of low stability of underground diaphragm wall groove wall in deep foundation pit in soft soil area, high difficulty in determining mud scheme, unstable construction quality, long construction period, etc. technical problem

Method used

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  • Soft-soil area underground diaphragm wall supporting slurry and method of determining slurry ratio thereof
  • Soft-soil area underground diaphragm wall supporting slurry and method of determining slurry ratio thereof
  • Soft-soil area underground diaphragm wall supporting slurry and method of determining slurry ratio thereof

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Embodiment

[0055] Specifically, the excavation area of ​​the foundation pit of this project is about 21,000 square meters, and the total extension of the foundation pit is about 560 meters. Three concrete internal supports, the thickness of the underground diaphragm wall is 800mm, the bottom of the wall is embedded 18.8m below the base in the general area, and the elevation of the bottom of the underground diaphragm wall in the area adjacent to the subway is -42.0m; 102 underground diaphragm walls are all made of retaining mud groove walls.

[0056] like figure 1 As shown, the method for determining the mud ratio of the underground diaphragm wall retaining wall in this soft soil area, the specific steps are as follows:

[0057] Step 1: Investigate the engineering geological conditions and construction conditions; at the beginning of the project, according to the geological and hydrological exploration report provided by the third-party monitoring unit of the project, the soil layer and s...

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Abstract

The invention discloses a soft-soil area underground diaphragm wall supporting slurry and a method of determining slurry ratio thereof. The soft-soil area underground diaphragm wall supporting slurryis made by mixing bentonite, water and an admixture; per cubic meter, 110-120 kg of bentonite is added, 900-1000 kg of water is added, 4-5 kg of sodium carbonate is added, and 0.45-0.6 kg of sodium cellulose is added. The method herein is scientific and highly feasible. In practice, subsequent reinforcement cage tripping, concrete placing and other procedures can be finished quickly under high quality without affecting rail traffic operation; mainly, stability of an underground diaphragm wall is well guaranteed. Foundation pit deformation control and railway tunnel deformation control are bothwithin expectations. Safety can be ensured for a foundation pit and the ambient; the underground diaphragm wall can be stably and constantly in controllable and known state. The method herein help effectively solves problems of soft-soil area deep-large foundation pit engineering in construction layout, period control and protection; stability of the underground diaphragm wall is guaranteed.

Description

technical field [0001] The invention relates to the field of mud retaining wall construction, in particular to mud for retaining walls of underground diaphragm walls in soft soil areas and a method for determining the ratio of the mud. Background technique [0002] Diaphragm Wall (Diaphragm Wall) is a continuous underground wall with convenient functions such as seepage prevention (water), soil retaining and load bearing. Due to its good anti-seepage and waterproof slope support and stable function, the underground diaphragm wall is widely used in deep foundation pit support projects in soft soil areas. However, the instability of the groove wall is also a major problem in the construction of the underground diaphragm wall. Among them, the retaining wall mud plays a very critical role in the process of underground diaphragm wall forming grooves, and the importance of retaining wall mud is often ignored in many projects. [0003] The following problems exist in the selectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/00E02D5/20E02D17/04
CPCC04B30/00C04B2111/00293E02D5/20E02D17/04C04B14/104C04B24/383C04B22/10
Inventor 孙亮王宝峰孙东东刘金易郭婷婷郑凯阳吴晨曦吕兴邦
Owner BEIJING NO 3 CONSTR ENG
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