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Method for dewatering large-area foundation pit on silt stratum

A large-area, foundation pit technology, used in infrastructure engineering, construction, etc., can solve the problems of high cost and low dewatering efficiency of light wells, and achieve the effects of short construction period, improved dewatering efficiency and low cost.

Inactive Publication Date: 2012-07-04
HEBEI CONSTR & INVESTIGATION RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for dewatering large-area foundation pits in silty soil strata, which solves the problems of low dewatering efficiency and high cost of light well points at present

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  • Method for dewatering large-area foundation pit on silt stratum
  • Method for dewatering large-area foundation pit on silt stratum

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Embodiment

[0028] The foundation pit of a single electrolytic aluminum workshop in the implementation project has a length of 1200m, a width of 40m, a precipitation area of ​​48,000 square meters, and an excavation depth of 4.0m. Utilize construction method precipitation of the present invention, concrete implementation process is as follows:

[0029] (1) Set up a circle of maintenance well points 0.5m outside the boundary of the foundation pit, a total of 800 maintenance well points, with a distance of 4.0m between maintenance well points. The well points within the scope of the foundation pit are arranged in parallel rows along the width direction of the factory building. A total of 5 rows of dewatering wells are arranged, the spacing between the well points is 6.7m, the well point spacing in each row is 4.0m, and the depth of the dewatering wells is 6.0m.

[0030] (2) Use a high-pressure water gun to form holes, and the water pressure is controlled at 0.4-0.8MPa. After punching to th...

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Abstract

The invention discloses a method for dewatering a large-area foundation pit on a silt stratum, which belongs to modification of existing methods of dewatering light well points and includes the steps: firstly, setting well points, and determining spacing and depth of the well points according to dewatering depth and dewatering area; secondly, constructing the well points; thirdly, installing a dewatering system; fourthly, cleaning up wells; fifthly, operating the dewatering system to pump water; sixthly, regionally repeating the steps from one to five for dewatering a large-area foundation pit, lowering the water level to an expected depth, and maintaining the water level; seventhly, dismantling the dewater system within the foundation pit, maintaining the system to operate until the foundation pit is backfilled above the underground water level, and maintaining the underground water level to meet demands during construction; and eighthly, dismantling the foundation pit and maintaining the dewatering system. Mutual coupling among the well points is fully utilized, so that dewatering efficiency is improved. Compared with conventional light well point dewatering methods, the method is short in construction period, low in manufacturing cost and effective.

Description

technical field [0001] The invention relates to a method for dewatering large-area foundation pits in silt soil strata, and belongs to the technical field of building foundation treatment. Background technique [0002] In the field of engineering construction, it is often necessary to lower the groundwater level first during foundation construction, and dewatering at foundation pit well points is a more commonly used dewatering method. There are many methods of dewatering well points in foundation pits, and commonly used methods include tube well well points, light well points, jet well points, and electroosmotic well points. Dewatering in silty soil strata is one of the difficulties in dewatering projects at present. If tube wells are used, the dewatering effect will not be ideal. Although jetting wells and electroosmotic wells can solve the problem of dewatering, the construction process is relatively complicated and the cost is high. In the prior art, the light well poin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/10
Inventor 聂庆科王英辉梁书奇贾向新解静
Owner HEBEI CONSTR & INVESTIGATION RES INST
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