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Deep mixing pile-micro pre-stressed steel pipe concrete pile-vertical anchor rod composite foundation pit support method

A technology for steel pipe concrete piles and deep mixing piles, which is applied in foundation structure engineering, sheet pile walls, excavation, etc., and can solve the problems of damage, bending resistance, shear resistance, overturning resistance and slip resistance, which affect the safety of foundation pit buildings and other issues, to achieve short construction period, improve anti-overturning and anti-sliding ability, and favorable effects of environmental protection

Inactive Publication Date: 2010-10-06
WUHAN SURVEYING GEOTECHN RES INST OF MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventionally used gravity retaining wall with deep mixing piles has poor bending resistance, shear resistance, overturning resistance and slip resistance, and is easily damaged under the action of earth pressure, which affects the safety of the foundation pit and surrounding buildings. Therefore, it is necessary to improve the existing technology

Method used

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  • Deep mixing pile-micro pre-stressed steel pipe concrete pile-vertical anchor rod composite foundation pit support method
  • Deep mixing pile-micro pre-stressed steel pipe concrete pile-vertical anchor rod composite foundation pit support method
  • Deep mixing pile-micro pre-stressed steel pipe concrete pile-vertical anchor rod composite foundation pit support method

Examples

Experimental program
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Effect test

Embodiment 1

[0015] according to figure 1 , figure 2 As shown, a deep mixing pile + micro prestressed steel pipe concrete pile + vertical anchor bolt composite foundation pit support method, the steps are as follows:

[0016] 1. Construction of deep mixing piles;

[0017] 2. Within 12 hours after the construction of the deep mixing pile, use an engineering drilling rig to form a hole in the mixing pile, insert the ribbed steel bar into the soil layer at the anchoring end, and perform grouting at the anchoring end;

[0018] 3. After the slurry is solidified, put the round steel pipe on the ribbed steel bar and insert it into the bottom of the deep mixing pile through the inner hole of the mixing pile. After pouring the concrete cover plate and solidifying, the ribbed steel bar is stretched to apply prestress and locked with the anchor, and then to the circular Grout is poured into the steel pipe to form a miniature prestressed steel pipe concrete pile.

[0019] The outer diameter of the...

Embodiment 2

[0021] according to figure 1 , figure 2 As shown, a deep mixing pile + micro prestressed steel pipe concrete pile + vertical anchor bolt composite foundation pit support method, the steps are as follows:

[0022] 1. Construction of deep mixing piles;

[0023] 2. Within 12 hours after the construction of the deep mixing pile, use an engineering drilling rig to form a hole in the mixing pile, insert the steel hinge line into the soil layer at the anchoring end, and perform grouting at the anchoring end;

[0024] 3. After the slurry is solidified, put the square steel pipe on the steel hinge line and insert it into the bottom of the deep mixing pile through the inner hole of the mixing pile. After pouring the concrete cover plate and solidifying, stretch the steel hinge line to apply prestress and lock it with anchors, and then install it in the direction Fine stone concrete is poured into the steel pipe to form a micro prestressed steel pipe concrete pile.

[0025] The outer...

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Abstract

The invention provides a deep mixing pile-micro pre-stressed steel pipe concrete pile-vertical anchor rod composite foundation pit support method. The method comprises the following steps: (1) constructing the deep mixing pile; (2) grouting at an anchoring end; and (3) forming the micro pre-stressed steel pipe concrete pile. The method has the advantages that as the deep mixing pile is equipped with the micro pre-stressed steel pipe pile and an anchor rod or an anchor rope, the bending and shearing bearing capacity thereof is improved; the antidumping and anti-slip capability of the wall body of the mixing pile is improved under the condition of not exceeding a land red line; and meanwhile the combined support method has the advantages of short construction period, low noise, no pollution and no soil squeezing and is very beneficial to environmental protection during the construction process, thus being a novel combined support member and a method which are worth to be popularized and applied.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a composite foundation pit supporting method of deep mixing piles + micro prestressed steel pipe concrete piles + vertical anchor rods. Background technique [0002] The safety of the foundation pit is directly related to the safety of life and property. How to ensure the safety of the foundation pit under economical and reasonable conditions depends on the reliability of the support system. However, the conventionally used gravity retaining wall with deep mixing piles has poor bending resistance, shear resistance, overturning resistance and slip resistance, and is easily damaged under the action of earth pressure, which affects the safety of the foundation pit and surrounding buildings. Therefore, it is necessary to improve the prior art. Contents of the invention [0003] The purpose of the present invention is to develop a kind of deep mixing pile+miniature prestressed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/04E02D17/20E02D5/74E02D5/46E02D5/58
Inventor 姚小波刘国清江永建柳文涛万加勤胡兴坤
Owner WUHAN SURVEYING GEOTECHN RES INST OF MCC
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