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Deep foundation pit piping erosion blocking method

A deep foundation pit and piping technology, applied in infrastructure engineering, construction and other directions, can solve the problem of consuming a lot of manpower, material resources and time, achieve the effect of rapid construction and prevent further expansion

Inactive Publication Date: 2019-11-01
SHANGHAI BAOYE GRP NANJING BUILDING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods need to expend a large amount of manpower, material resources and time to carry soil bag, make surrounding well

Method used

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  • Deep foundation pit piping erosion blocking method
  • Deep foundation pit piping erosion blocking method

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Embodiment Construction

[0026] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer ” refer to directions towards or away from the geometric center of a particular part, respectively.

[0027] When piping is found, immediately fill the piping hole 1 with steel pipes and quilts to reduce the amount of water gushing.

[0028] Then, the prepared steel casing 8 is driven into the soil to a certain depth from above the piping hole 1 to form a cofferdam. At the same time, the soil around the steel casing 8 is compacted, and a layer of graded crushed stone is laid al...

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Abstract

The invention discloses a deep foundation pit piping erosion blocking method. The deep foundation pit piping erosion blocking method comprises the steps that firstly, a water gushing hole is filled byadopting steel tubes and quilts, and the water quantity is reduced preliminarily; then a steel retaining cylinder is driven into a soil body to the certain depth from the upside of the water gushinghole, and a cofferdam is formed; then, pea grit, graded broken stone and block stone are sequentially added into the steel retaining cylinder to form a filtering material, and piping erosion with sandis avoided; meanwhile, at least two pressure relief wells are arranged around a piping erosion point according to the piping erosion condition; in the next step, the existing steel retaining cylinderis heightened, the water pressure is balanced, and preparations are made for still water grouting; and finally, drilling grouting is carried out around a piping erosion port to form a water-resistinglayer so as to block the piping erosion point. The construction is rapid, the condition of the piping erosion with the sand can be avoided within a relatively short time, the piping erosion conditionis prevented from being further expanded, the dangerous circumstance is stabilized preliminarily, and the blocking effect can be exerted on the piping erosion point through the subsequent compactinggrouting treatment.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a piping plugging method for deep foundation pits. Background technique [0002] When the deep foundation pit is close to the river pond or there is a confined aquifer in the soil under the foundation pit, under the action of the water level difference, there is seepage water flow in the soil of the foundation pit, and due to the inhomogeneity of the soil, the The soil particles in a certain part will move under the action of seepage water flow, so that the fine particles filled in the voids of the soil skeleton will be taken away by the seepage water to form water gushing channels, that is, piping. The sediment carried in the piping will increase with the increase of the water inflow, and when the situation is serious, it will cause the foundation pit to collapse or displace. When piping occurs during the construction process, it is necessary to preven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/12E02D19/16C04B28/26C04B111/70
CPCC04B28/26C04B2111/70E02D19/12E02D19/16E02D2250/003E02D2300/0023E02D2300/0029E02D2300/0034C04B7/02
Inventor 吴雷柳勇龚云飞张海堂
Owner SHANGHAI BAOYE GRP NANJING BUILDING
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