A foundation pit support structure supported by inclined pile walls and its construction method

A foundation pit support and construction method technology, which is applied in the direction of foundation structure engineering, excavation, construction, etc., can solve the problems of large demand for flat sites, large diameter of double-row piles, and difficulty in implementation, so as to save cost and reduce cross-sectional size , Improve the effect of construction efficiency

Active Publication Date: 2019-07-05
ANHUI URBAN CONSTR DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Although the double-row pile support structure significantly enhances the rigidity of the enclosure structure through the "gate-type" structure, increases the height of the cantilever support, and eliminates the adverse effects of internal supports or anchor cables, but its acceptance mechanism is still a cantilever beam. When the depth of the foundation pit is deep or the soil quality is poor, the horizontal lateral pressure is very large, the diameter of the double-row piles needs to be large, the cost is high, and it is difficult to strictly control the deformation
[0018] In addition, due to the installation of two rows of piles at the front and back, there is a large demand for a flat site, and it is difficult to implement when the excavation surface is close to buildings and structures.

Method used

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  • A foundation pit support structure supported by inclined pile walls and its construction method
  • A foundation pit support structure supported by inclined pile walls and its construction method
  • A foundation pit support structure supported by inclined pile walls and its construction method

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Effect test

Embodiment 1

[0046] The single-layer inclined pile wall 2-supported foundation pit support structure is characterized in that: the inclined pile wall 2-supported foundation pit support structure includes inclined pile walls 2, supporting piles 3 and crown beams 4, and the inclined pile walls 2 are arranged obliquely. The top of the inclined pile wall 2 is inclined toward the inside of the foundation pit, and the bottom of the inclined pile wall 2 obliquely enters the soil outside the foundation pit. 2 are connected at the top, and the bottom of the supporting pile 3 is arranged in the soil at the bottom 6 of the foundation pit. Usually, the inclination angle of the inclined pile wall is 10 to 30 degrees, depending on the soil quality and the depth of the foundation pit.

[0047] Commonly used foundation pit support structures require widely distributed support structures in the foundation pit, so that the space in the foundation pit is occupied and divided, which greatly reduces the constr...

Embodiment 2

[0054] The construction method of the inclined pile wall 2 supporting type foundation pit support structure in embodiment 1 is characterized in that the steps are as follows:

[0055] Step 1, constructing meat pile 21 and plain pile 22 on natural ground 5 to form inclined pile wall 2, and construct support pile 3 simultaneously;

[0056] Step 2, after the construction of meat pile 21, plain pile 22 and support pile 3 is completed, crown beam 4 is constructed on the top of meat pile 21, plain pile 22 and support pile 3, and support pile 3 and inclined pile wall 2 are connected as a whole;

[0057] Step 3: Excavate the foundation pit bottom 6 as a whole, complete the foundation pit support and earthwork excavation, and hand over to the civil construction unit for basement structure construction.

Embodiment 3

[0059] Double-layer inclined pile wall 2 supporting type foundation pit support structure, on the basis of embodiment 1, a second inclined pile wall 23 is also arranged below the inclined pile wall 2, the structure of the second inclined pile wall 23 is the same as that of the inclined pile wall 2 have the same structure, the top of the second inclined pile wall 23 is provided with a waist beam 8, and the waist beam 8 is connected with the waist of the support pile 3. For deep foundation pits, the scheme of multi-layer inclined pile wall 2 support can be adopted. As the depth of the foundation pit increases, the surrounding soil needs a stronger supporting structure to provide supporting force. The structure of single-layer inclined pile wall 2 cannot provide sufficient supporting force. We adopt the structure of multi-layer inclined pile wall 2, and divide Layer support, and then the multi-layer inclined pile wall 2 is connected into an integral support bracket through the wa...

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Abstract

The invention discloses an inclined pile wall bearing type foundation pit support structure. The inclined pile wall bearing type foundation pit support structure is characterized by comprising an inclined pile wall, a bearing pile and a crown beam, the inclined pile wall is obliquely arranged, the top of the inclined pile wall is inclined towards the interior of a foundation pit, the bottom of the inclined pile wall obliquely enters a soil body outside the foundation pit, the bearing pile is vertically arranged below the top of the inclined pile wall, the top of the bearing pile and the top of the inclined pile wall are connected, and the bottom of the bearing pile is arranged in the soil body at the bottom of the foundation pit. Compared with the prior art, the inclined pile wall bearing type foundation pit support structure has the following beneficial effects that a horizontal diagonal brace system in the pit is eliminated, a good plane operation space is provided for foundation pit earth excavation and basement structure construction, the construction efficiency is greatly improved, and the manufacturing cost is saved; and a horizontal anchor cable anchored in the soil body outside the pit is eliminated, and the problem that the anchor cable exceeds the property line and infringes rights is solved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a foundation pit support structure supported by inclined pile walls in a temporary foundation pit support method and a construction method thereof. Background technique [0002] For deep and large foundation pits with large plane size and large excavation depth, the foundation pit support methods currently used in China mainly include: internal support support structure, pile-anchor support structure, and double-row pile support structure. [0003] The internal support structure and the surrounding enclosure structure of the pile-anchor support structure are generally arranged along the periphery of the foundation pit with vertical column row piles, underground diaphragm walls, reinforced cement-soil walls or occlusal piles, etc. [0004] The planar layout forms of the internal support of the internal support structure mainly include: grid pattern, opposite truss, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 束冬青蔡敏李彪胡萍张晓波周阳刘贵强张龙飞丁俊恩单灿灿
Owner ANHUI URBAN CONSTR DESIGN & RES INST
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