Construction method of geological pile punching hole with expansion soil layer

A construction method and soil layer technology, applied in sheet pile walls, infrastructure engineering, construction, etc., can solve the problems of reducing concrete, the height of reinforcement cages cannot be placed at the bottom mark, shrinkage holes, etc., so as to avoid residual piles and shrinkage holes. effect of the phenomenon

Active Publication Date: 2018-05-04
云南建投第十一建设有限公司
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  • Summary
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AI Technical Summary

Problems solved by technology

[0003] Since the percussion drilling method uses mud to protect the wall, there will be a certain amount of water in the pile hole. In view of the characteristics of expansive soil that expands with water and shrinks when it loses water, the following three situations often occur during the pile hole punching process: 1) After the impact hammer enters the expansive soil layer, due to the impact force of the impact hammer, the impact hammer will enter the expansive soil layer. When the expansive soil layer is deep, the expansive soil above the impact hammer will expand after being exposed to water, resulting in pile holes that have been punched in the upper part. Shrinkage cavity phenomenon will ap

Method used

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Examples

Experimental program
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Embodiment 1

[0021] (a) Firstly, draw a geological histogram of the borehole according to the geological survey data, the geological histogram of the borehole includes the starting position and the end position of the expansive soil layer, and marks the position and depth of the expansive soil in the pile hole; ( b) Drilling to the starting point of the expansive soil layer according to the drilling geological histogram; (c) stop drilling, make slurry and add water in the drilled hole, and wait for the expansive soil layer to absorb water. The material used for slurrying here is It is expansive soil, clay, stone; (d) After the expansive soil layer absorbs water for about 24 hours, perform shallow stroke punching; (e) After punching to a depth of about 2m in the expansive soil layer, remove the impact hammer and replace it with a long 4 The I20 I-beam up to 6m is used to ream the retaining wall around the expansive soil, and the reaming coefficient is about 1.2; (f) After the reaming is comp...

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Abstract

The invention discloses a construction method of a geological pile punching hole with an expansion soil layer. The expansion soil layer fully absorbs water in a pile hole before punching, and expansion soil fully absorbs the water for expansion to prevent the hole shrinkage phenomenon; the hole expansion is performed after shallow-stroke punching to guarantee no hole shrinkage phenomenon after completion of a pulping protection wall after the hole expansion; and the pulping protection wall is constructed after the hole expansion is finished to prevent the hole shrinkage phenomenon, so that theexpansion soil layer cannot infiltrate a pile entity in subsequent casting to prevent a residual pile.

Description

technical field [0001] The invention relates to the technical field of pile hole punching, in particular to a construction method for geological pile hole punching with expansive soil layer. Background technique [0002] The mineral composition of expansive soil is mainly montmorillonite, which is a kind of highly plastic clay with high bearing capacity in general. Extremely unstable. It often causes uneven vertical or horizontal expansion and contraction deformation of buildings, causing displacement, cracking, tilting and even destruction, and often occurs in groups. [0003] Since the percussion drilling method uses mud to protect the wall, there will be a certain amount of water in the pile hole. In view of the characteristics of expansive soil that expands with water and shrinks when it loses water, the following three situations often occur during the pile hole punching process: 1) After the impact hammer enters the expansive soil layer, due to the impact force of th...

Claims

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Application Information

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IPC IPC(8): E02D7/06
CPCE02D7/06
Inventor 张祥辉何仕东唐龙清吴勇笪启云聂桂林柳德胜马思宇王少川
Owner 云南建投第十一建设有限公司
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