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Structure and Construction Method for Reducing Pile Length in Deep Soft Soil Layer by Forming Composite Foundation

A technology of composite foundation and construction method, which is applied in the direction of foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems of prone to bending damage, difficult construction, complicated process, etc., achieves convenient operation, saves materials, and overcomes pile body The effect of length

Active Publication Date: 2020-11-10
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, conventional cast-in-place friction piles are used to deal with deep soft foundations. The pile body is long, and it is prone to bending failure under load; and the longer the pile body, the greater the material used, the more difficult the construction, and the more complicated the process

Method used

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  • Structure and Construction Method for Reducing Pile Length in Deep Soft Soil Layer by Forming Composite Foundation
  • Structure and Construction Method for Reducing Pile Length in Deep Soft Soil Layer by Forming Composite Foundation
  • Structure and Construction Method for Reducing Pile Length in Deep Soft Soil Layer by Forming Composite Foundation

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Experimental program
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Effect test

Embodiment 1

[0042] Step 1: On the basis of three connections and one leveling of the site, according to the data of the building survey control network and the foundation layout plan, determine the grid control network of the pile position axis and the elevation reference point, determine the center of the pile position, and take the center as the center of the circle , take the pile body radius plus the casing thickness as the radius to draw the circle of the upper part (that is, the first section), and the lime sprinkling line is used as the pile hole excavation dimension line, and four pile central axis controls are drawn out of the pile hole along the pile center position Points are marked with solid wooden stakes;

[0043] Step 2: Manual excavation of pile holes should be carried out layer by layer from top to bottom. First dig the middle part of the soil, and then expand to the surrounding area to effectively control the section size of the excavated pile holes. The height of each se...

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Abstract

The invention discloses a structure and method for reducing the pile length of a deep soft soil layer by forming a composite foundation. The structure comprises a casing pipe; the casing pipe comprises a casing pipe outer wall, a casing pipe inner wall, an overflow hole, a pressure chamber and a grouting opening; the pressure chamber is formed between the casing pipe outer wall and the casing pipeinner wall; a grouting system is vertically distributed on the outer wall of the pressure chamber; a grouting pipe is inserted into the grouting opening in a pressure chamber top board on the top ofthe pressure chamber and injects mortar into the pressure chamber; and the mortar flows out of the casing pipe outer wall through the overflow hole formed in the pressure chamber to be mixed with softsoil to form the composite foundation. According to the structure and method for reducing the pile length of the deep soft soil layer by forming the composite foundation, the mortar and the soft soilfoundation are mixed to the composite foundation, the foundation soil property is improved, the bearing force of the foundation is improved, friction resistance between a friction pile and the foundation is increased, accordingly the pile length of the friction pile is effectively reduced, the materials are saved, the cost is reduced, and at the same time, the casing pipe also achieves the supporting function, hole collapse is prevented, and the structure has very important significance for foundation engineering.

Description

technical field [0001] The invention relates to the technical field of engineering piles and construction methods, in particular to a structure and construction method for reducing the length of piles in deep soft soil layers by forming a composite foundation. Background technique [0002] Soft soil foundation refers to the foundation composed of soft soil. Its soil composition is mainly soft soil, which is characterized by high natural water content, large natural void ratio, low shear strength, high compressibility coefficient and small permeability coefficient. Under the action of load, the soft soil foundation has low bearing capacity, large foundation settlement deformation, and possible uneven settlement, which belongs to a kind of bad foundation. [0003] If the pile passes through and is supported on various compressed soil layers, the vertical load is mainly supported by the frictional resistance of the pile side soil, and such a pile is called a friction pile. At ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D15/04E02D5/46
CPCE02D5/46E02D15/04E02D2250/003
Inventor 倪小东姬良龙徐硕王媛陆江发曹文振
Owner HOHAI UNIV
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