Combined bracing structure for foundation pit and construction method thereof

A technology of foundation pit support and construction method, which is applied in the directions of foundation structure engineering, excavation, construction, etc., can solve the problems of difficulty in guaranteeing pile quality and verticality of pile body, poor water-stop effect, and high engineering cost, and achieves high construction cost. Simple and fast, reducing the bending moment of the pile body, and the effect of large overall rigidity

Inactive Publication Date: 2011-07-06
SOUTHEAST UNIV
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  • Abstract
  • Description
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Problems solved by technology

Three-axis deep mixing piles generally have better pile quality than biaxial deep mixing piles, but in sandy soil, if the reinforcement depth is too deep (for example, more than 15 meters), the pile quality and verticality of the pile body are difficult to guarantee, and the lower part is anti-seepage The wall is discontinuous and there are splits, the water-stop effect is not good, and the project cost is high

Method used

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  • Combined bracing structure for foundation pit and construction method thereof
  • Combined bracing structure for foundation pit and construction method thereof

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Embodiment Construction

[0018] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0019] like figure 1 As shown, a combined foundation pit support structure includes a bored pile 1 as a support structure and a steel sheet pile 2 as a water-stop curtain. The bored pile 1 and the steel sheet pile 2 pass through the inner pile top ring beam 3, The outer pile top ring beam 4 and the inner and outer pile top connecting beams 5 form a space truss structure. The bored pile 1 and the steel sheet pile 2 of the present invention are arranged between the ground surface 6 behind the wall and the foundation pit bottom 7 .

[0020] The construction method based on the combined foundation pit supporting structure of the present invention may further comprise the steps:

[0021] Step 1: Determine the pile length, pile diameter, spacing and reinforcement of the bored pile 1 according to the site conditions and calculation analysis, and determine th...

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Abstract

The invention provides a combined bracing structure for a foundation pit and a construction method thereof, relating to the combined bracing structure for the foundation pit and belonging to the technical field of geotechnical engineering. The combined bracing structure for the foundation pit comprises a cast-in-situ bored pile used as the bracing structure and a steel sheet pile used as a waterproof curtain, wherein a space truss structure is formed by the cast-in-situ bored pile and the steel sheet pile through an inner pile block ring beam, an outer pile block ring beam as well as inner and outer pile block connecting beams. The invention achieves the purposes of simple and fast construction, easy quality control, cycle use and high integral rigidity.

Description

technical field [0001] The invention relates to a combined foundation pit support structure, which belongs to the technical field of geotechnical engineering. Background technique [0002] Foundation pit support is a support reinforcement and protection measure for the side wall of the foundation pit and the surrounding environment to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit. The supporting structure of the foundation pit can be selected according to the surrounding environment of the foundation pit, excavation depth, engineering geology and hydrogeology, construction equipment and construction season. Cement soil wall, inverted arch wall, soil nail wall or a combination of the above types. [0003] Among them, bored pile + deep mixing pile water-stop curtain is the most mature and most commonly used foundation pit support type. Bored cast-in-situ piles have high bearing capacity and can pass throug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04
Inventor 方磊李仁民王军培龚文宗李青苗
Owner SOUTHEAST UNIV
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