Selection and control method of punching pile protection wall structure material for special geological conditions

A technology with a special geological and control method, which is applied in the direction of foundation structure engineering, sheet pile walls, buildings, etc., can solve problems such as unfixed movement direction, slurry leakage, failure to reach consolidated gravel, pebble soil layer retaining wall, etc., to achieve Reduce work and improve construction efficiency

Inactive Publication Date: 2018-05-04
云南建投第十一建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the following problems: 1) bentonite, soda ash, ionic cellulose mixing ratio is difficult to control; 2) although the mixing ratio of mud mixing materials is well controlled, the wall protection effect of mud is not very good in construction, even Multiple occurrences of slurry leakage in the hole
However, the punching cone of the punching drill moves vertically up and down under the action of Okinawa. During the lifting and lowering process of the punching cone in Okinawa, the direction of movement of the punching cone is not fixed, and it will scrape the retaining wall, causing the consolidated retaining wall to be destroyed again. Cannot achieve the effect of consolidating gravel and pebble soil layer retaining wall

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] When the geological structure of the pile is stable, and the geological structure is clay, strong, and moderately weathered rock punching, the retaining wall material is made of clay, and the formula for calculating the amount of clay in the mud is q=v×p1=[(p2-p3) / (p1- p3), where v-clay volume required per cubic meter of mud, p1-clay density, p2-required mud density, p3-water density, by controlling the ratio of clay to water, the viscosity of the mud is increased.

Embodiment 2

[0035] When punching in the silt layer and gravel geological structure layer, the expansive soil and cement are mixed into cement-mixed soil to make slurry. Preferably, the expansive soil and cement are mixed according to the mass ratio of 5:1. By controlling the expansive soil, water The ratio of the mixed cement mixed soil meets: 20Pa.s≤dynamic viscosity≤30Pa.s, 1.2g / cm 3 ≤Specific gravity≤1.4g / cm 3 , sand content rate ≤ 4%, water loss rate ≤ 20ml / 30min, 8 ≤ PH ≤ 11, 3Pa ≤ static shear force ≤ 5Pa, colloid rate ≥ 95%, mud thickness ≤ 3mm / 30min.

Embodiment 3

[0037] When punching holes in moderately and slightly weathered geological conditions and where the pile construction position is relatively flat, mix clay, cement, and plaster of paris to make slurry. The gypsum slurry will expand slightly in the early stage of setting and hardening, and the expansion rate is 0.5% to 1. %. This property makes the surface of gypsum products smooth, delicate, accurate in size, full in shape, good in decoration, and ensures the effect of wall protection. Preferably, clay, cement, and plaster are mixed according to the mass ratio of 100:5:3. By controlling the ratio of clay, cement, and plaster, the mixed mud meets: 18s≤England viscosity≤22s, 1.04g / cm 3 ≤Specific gravity≤1.06g / cm 3 , 1% ≤ sand content ≤ 4%, water loss < 30ml / 30min, 7 ≤ PH ≤ 9. The mud can quickly consolidate the gravel and pebble layers around the hole. As the punching cone moves up and down, the mud is squeezed to embed the loose gravel and pebble layers. The more the wall l...

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PUM

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Abstract

The invention discloses a selection and control method of a punching pile protection wall structure material for special geological conditions. During punching in strongly and moderately weathered rock, the protection wall material adopts clay slurry making; during punching in powder sand layers and gravel geological structure layers, the slurry making material is formed by mixing expansive soil with cement, and parameters such as the viscosity and the like of the mixed slurry are controlled strictly; during punching under moderately and weakly weathered geological conditions and in sections having relatively flat pile construction positions, clay, cement and calcined gypsum are mixed to form slurry, and parameters such as the viscosity and the like of the mixed slurry are controlled strictly; the protection wall quality under the different geological conditions is improved, and the construction progress is accelerated.

Description

technical field [0001] The invention relates to the technical field of pile hole punching, in particular to a method for selecting and controlling structural materials of special geological punching pile retaining walls. Background technique [0002] The geological conditions of the Honghe reverse deep fault zone in Yunnan are that folds are interwoven with faults, the geological formation is late, the geological structure is complex, the height difference of the geographical environment is as high as 440 meters, the edges of the terraces are steep walls, the slope is large and steep, the geological structure is complex, and the folds , and faults are clearly developed; the lithofacies, structures and biota of the north and south areas are significantly different; the direction of the structural line is disordered in the north area, and obvious in the south area, which is a north-west linear structure parallel to the Honghe reverse deep fault, lithology slate, mudstone It is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D13/02
CPCE02D13/02
Inventor 蒋建军周先友柳德胜罗明伦聂桂林陆永雄方文胜唐龙清吴勇
Owner 云南建投第十一建设有限公司
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