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New type cement soil pile and its construction method

A technology of cement-soil pile and construction method, which is applied in sheet pile wall, foundation structure engineering, sustainable waste treatment, etc., can solve the problem that the mixing pile cannot form a hole, the cement slurry cannot be effectively combined with the foundation soil, and the mixing pile cannot be widely used and other problems to achieve the effect of controlling the coagulation time

Active Publication Date: 2006-01-11
何世鸣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of cement-soil pile and its construction method to solve the problem that the stirring pile cannot be formed in peat soil and other strata, and the cement slurry and the foundation soil cannot be effectively combined, which leads to the problem that the stirring pile cannot be widely used.

Method used

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  • New type cement soil pile and its construction method

Examples

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Effect test

Embodiment 1

[0013] Example 1, a new civil air defense foundation pit support project for an office building is located near the intersection of Guangfu Road and Dianchi Road in Kunming City, between Shili Chang Street and Guangfu Road. The total design area of ​​the proposed building is about 8000m 2 . Frame-shear structure, the buried depth of the basement is -6.1m, partly -5.4m, including a 600mm thick replacement cushion. The surface elevation is ±0.00, partly -0.7m, the pit depth is 6.1m and 5.4m, and the foundation design form is a pile-raft foundation.

[0014] The proposed site is geomorphologically located in the northeast of the Dianchi Basin and belongs to the lacustrine plain geomorphological unit. According to the strata exposed by the 80-meter borehole, and according to the genetic type, sedimentary rhythm, and soil physical and mechanical design parameters, the foundation soil layer is divided into six major layers, which are described from top to bottom as follows:

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Embodiment 2

[0034] Example 2, a certain silt soil is 8-11m thick, 4-6m silty clay beneath it, the depth of the foundation pit is 6-7m, and the area of ​​the foundation pit is about 40000m2 2 , using reinforced concrete piles combined with the new cement-soil piles combined soil retaining and water-stop composite support scheme, instead of the original 6-row mixing pile support scheme, can effectively reduce costs, shorten the construction period, and ensure quality. The new cement-soil pile formula (every 1m 3 In water): 350kg of cement, 750kg of good soil, 250kg of stone chips, 75kg of fly ash, 3% of quick-setting agent (weight of cement). The specific gravity of the mixture is required to be 1.3 to 1.5. The above-mentioned process of "forming holes with a long auger drilling machine and pumping new cement-soil mixture into piles in the pipe" is adopted.

Embodiment 3

[0035] Example 3, a quicksand layer with a thickness of about 5-6m, a relatively shallow groundwater depth, and a foundation pit depth of 12m. A composite support scheme for retaining soil and water is adopted that combines reinforced concrete piles with the new cement-soil piles, which can effectively prevent Soil loss between piles ensures the success of foundation pit support. The new cement-soil pile formula (every 1m 3 In water): 300kg of cement, 800kg of good soil, 3% of accelerator (weight of cement). The above-mentioned process of "forming holes with a long auger drilling machine and pumping new cement-soil mixture into piles in the pipe" is adopted.

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Abstract

The present invention relates to a new-type cement soil pile and its construction method. Said invention uses forced type or drum type stirring machine to stir cement, selected high-quality soil and additive or the ground surface, and adopts hollow long spiral drill to form hole and adopts the mode of pumping stirred material into pipe to form pile so as to obtain the invented cement soil pile.

Description

technical field [0001] The invention belongs to pile forming in building foundation construction, in particular to a novel cement-soil pile and a pile forming method thereof. It is used for forming piles such as composite foundation piles, slope protection piles, and water-stop curtain piles. Especially in peat soil, silt, quicksand and sandy pebble formations. Background technique [0002] Cement-soil mixing piles are widely used in fields such as foundation treatment, foundation pit support, and water-stop curtain piles because of their simple construction and low cost. are greatly restricted. For example, peat soil in a site in Kunming area is black, black gray and brown, saturated, soft to fluid plastic state, and highly compressible. The specific gravity is close to 1.0, the pores are large and loose, the void ratio e=3.01-8.04, the average value is 5.63, the average water content is 267%, and the average organic matter content is 45.4%. It is a strong peaty soil wit...

Claims

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Application Information

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IPC IPC(8): E02D5/36C04B14/10C04B18/06
CPCY02W30/91
Inventor 何世鸣胡云平俞春林汪本辉邢涛张宝河任攀贾城周与诚王建明
Owner 何世鸣
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