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Foundation pit construction method employing steel sheet piles as support cofferdam

A technology of steel sheet pile cofferdam and construction method, which can be used in basic structure engineering, excavation, construction, etc.

Active Publication Date: 2014-12-10
CHINA CONSTR COMM ENG GRP UNITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For strong permeable geology and high groundwater level, strong drainage in the foundation pit and the use of well point dewatering system often lead to subsidence around the foundation pit, and if there are buildings around, the building will inevitably be damaged; for strong flow plastic silt geology and foundation When the excavation depth of the pit is deep, the base is prone to uplift and deformation during the excavation process, and measures such as undrained excavation and underwater bottom sealing must be considered. Therefore, the traditional construction technology of excavating first and then sealing the bottom is not suitable for the above two geology

Method used

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  • Foundation pit construction method employing steel sheet piles as support cofferdam
  • Foundation pit construction method employing steel sheet piles as support cofferdam
  • Foundation pit construction method employing steel sheet piles as support cofferdam

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Embodiment Construction

[0034] Such as Figure 1-3 , the present embodiment is the construction of bridge caps in a river, the caps are located in strong water-permeable sandy soil, the construction process includes foundation pit excavation and caps pouring, including the following steps in turn:

[0035] A. Insert and drive steel sheet piles to form steel sheet pile cofferdams;

[0036] B. Use the high-pressure rotary jet grouting method to seal the bottom surface of the foundation pit to be constructed;

[0037] C. Excavation of foundation pit and installation of support in cofferdam.

[0038] D. Cap pouring.

[0039] Described step A comprises the following steps:

[0040] (1) Determination of cofferdam structure, size and construction location as well as measurement and setting out

[0041] According to the structure, size and construction position of the cap to be constructed, the structure, size and construction position of the cofferdam are determined. Measurement and setting out of the ...

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Abstract

The invention discloses a foundation pit construction method employing steel sheet piles as a support cofferdam. The foundation pit construction method is suitable to high-water permeability sand soil geology or high-flow plasticity sludge geology and includes the steps of A, inserting and driving the steel sheet piles to form the steel sheet pile cofferdam; B, performing the ground sealing to a bottom face of the foundation pit to be constructed by employing a high pressure jet grouting method; C, excavating the foundation pit and mounting an inner support of the cofferdam. Compared with the conventional method that the ground sealing is performed to the foundation pit after the excavation, the foundation pit construction method has the advantages that the excavation is performed before the ground sealing, thus cofferdam collapse and piping or upwarp of the cofferdam base never occur in the case of the high-water permeability sand soil geology or the high-flow plasticity sludge geology, and the building-around settlement, caused by drainage and rainfall, is avoided to prevent ground sealing under the water.

Description

technical field [0001] The invention relates to the technical field of foundation construction, in particular to a foundation pit construction method using steel sheet piles as a supporting cofferdam. Background technique [0002] In civil engineering foundation construction, such as bridge cap construction, steel sheet pile cofferdam is a common construction method today. Under normal geological conditions, in the foundation construction using steel sheet pile cofferdams, the surveyors first control the plane position and elevation according to the construction drawings, and set up signs, and then excavate the foundation pit with an excavator until it reaches the top surface of the cap Set up a layer of steel sheet pile inner support, and when the groundwater overflows, use manual mud pumps to clean the base, pump water, stop leaks, prepare the bottom seal, and finally carry out the construction of the cap, that is, the construction of the steel sheet pile cofferdam——openin...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D19/04
Inventor 姜薪孙迎春戴考红肖锐王艳青王海峰陈卓林腾飞
Owner CHINA CONSTR COMM ENG GRP UNITED
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