Chemical improvement curtain and well point dewatering foundation pit water stop structure and construction method

A technology of chemical improvement and well point dewatering, applied in chemical instruments and methods, infrastructure engineering, excavation, etc., can solve the problems of complex construction technology of water-stop structure and long time for water-stop to exert its effect

Pending Publication Date: 2021-09-10
杭州交投建设工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a chemically improved curtain and well point dewatering foundation pit water-stop structure and construction method to solve the complex construction process of three-axis mixing piles, underground diaphragm walls and other water-stop structures, and the long time for water-stop to exert its effect And other issues

Method used

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  • Chemical improvement curtain and well point dewatering foundation pit water stop structure and construction method
  • Chemical improvement curtain and well point dewatering foundation pit water stop structure and construction method
  • Chemical improvement curtain and well point dewatering foundation pit water stop structure and construction method

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Embodiment 1

[0070] This embodiment discloses a chemically improved curtain and a foundation pit water-stopping structure for dewatering at well points, including a foundation pit retaining structure 3 , a chemically improved grouting curtain 4 , crown beams 5 , slope concrete 6 and a dewatering well 7 .

[0071] see figure 1 , the chemically modified grouting curtain 4 is arranged in the soil body at the upper port of the foundation pit, and the chemically modified grouting curtain 4 is formed by injecting a chemical modification reagent into silt for construction, and the chemical modification reagent is a mixed solution of water glass and aluminum dihydrogen phosphate , the mixed solution of calcium lignosulfonate and water or the mixed solution of sodium polyacrylate and water, the present embodiment just adopts the mixed solution of calcium lignosulfonate and water, and the mass ratio of calcium lignosulfonate and water is 10: 90~15:85, according to the ratio of calcium lignosulfonate...

Embodiment 2

[0081] This embodiment discloses a construction method based on a chemically improved curtain and well point dewatering foundation pit water stop structure described in Embodiment 1, including the following steps:

[0082] 1) Level the site to the design elevation.

[0083] 2) Construction of the foundation pit retaining structure 3 is carried out at a predetermined position, and the construction of the crown beam 5 is completed on the upper end of the foundation pit retaining structure 3 . Wherein, the foundation pit supporting and retaining structure 3 is a plurality of bored piles arranged at intervals or construction method piles, and this embodiment adopts several bored piles arranged at intervals.

[0084] 3) Construction of the chemically improved grouting curtain 4 includes the following sub-steps:

[0085] 3-1) Configure the chemical modification reagent. Wherein, the chemical improvement reagent is a mixed solution of water glass and aluminum dihydrogen phosphate, ...

Embodiment 3

[0104] This embodiment discloses a chemically improved curtain and a foundation pit water-stop structure for dewatering at well points, including a foundation pit support structure 3 , a chemically improved grouting curtain 4 , crown beams 5 , dewatering wells 7 and beams 10 .

[0105] see figure 2 , the foundation pit retaining structure 3 is arranged along the vertical side wall of the foundation pit, and the foundation pit retaining structure 3 is a plurality of bored piles or engineering method piles arranged at intervals, and a crown beam is installed on the top of the foundation pit retaining structure 3 5. A chemically modified grouting curtain 4 is set in the soil outside the foundation pit supporting structure 3 .

[0106] The chemically modified grouting curtain 4 is constructed by injecting chemical modification reagents into silt. The chemical modification reagents are a mixture of water glass and aluminum dihydrogen phosphate, a mixture of calcium lignosulfonate ...

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Abstract

The invention discloses a chemical improvement curtain and a well point dewatering foundation pit water stop structure and a construction method. The method comprises the following steps that (1) a site is leveled to the designed elevation; (2) a foundation pit supporting and retaining structure is constructed, and a crown beam is installed at the upper end of the foundation pit supporting and retaining structure; (3) a chemically-improved grouting curtain is constructed; (4) a plurality of dewatering wells are excavated on the inner side of the chemically-improved grouting curtain, and a water suction pump is installed; and (5) the foundation pit is excavated, and graded sloping treatment is conducted till the depth of the foundation pit meets the design requirement; and the water suction pump continuously operates in the excavation process, so that the underground water level is 2.8-3.0 m below the working face. The chemically-improved grouting curtain water stop and well point dewatering foundation pit water stop combined structure is more suitable for foundation pit water stop in a water-rich silt area, and instability caused by the characteristics of large water content, low strength, large compressibility, large water permeability and the like of silt engineering can be effectively dealt with.

Description

technical field [0001] The invention relates to the field of foundation pit construction, in particular to a foundation pit water stop structure and construction method for chemically improved curtain and well point dewatering. Background technique [0002] In the riverside silt area, the groundwater level of the foundation pit changes greatly under conditions such as strong tides. Large-scale foundation pit dewatering and excavation will easily cause surface settlement, resulting in large deformation of adjacent buildings, cracking and destruction of bridge pavement, buildings, etc. Triaxial mixing piles or underground diaphragm walls are commonly used as water stop structures for foundation pit construction, but the construction process of this water stop structure is complicated, and the water stop effect takes a long time. [0003] Therefore, it is necessary to develop a foundation pit water stop structure and construction method that can solve the above problems. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D17/04E02D19/18E02D19/10E02D31/02C09K17/40C09K103/00
CPCE02D17/20E02D17/207E02D17/04E02D19/18E02D19/10E02D31/02C09K17/40C09K2103/00
Inventor 宋叶青潘国华赵殿鹏刘明维顾海军毛巍鑫张重阳孔增增赵进葛鹏飞
Owner 杭州交投建设工程有限公司
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