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Method for strengthening jet grouting pile used in peat soil and organic soil

A technology of jet grouting piles and peat, which is applied in sheet pile walls, buildings, and foundation structure engineering, etc. It can solve problems such as waste of materials, environmental pollution, and inability to consolidate cement grout, so as to avoid grouting, strong adaptability, and good reinforcement effect

Inactive Publication Date: 2014-03-26
CHINA TIESIJU CIVIL ENG GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Its purpose of the present invention just is to provide a kind of method for the reinforcement of jet spray pile in peat soil and organic soil, the method of the present invention is safe and effective, can effectively solve the problem that cement grout can't be consolidated in peat soil, organic soil, And avoid the phenomenon of returning slurry caused by excessive soil pressure, resulting in waste of materials and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0019] The construction method of rotary grouting pile reinforcement in peaty soil layer is constructed according to the following process:

[0020] a. The drilling rig sinks to the design pile bottom elevation;

[0021] b. Mix the composite clay slurry, and spray the high-pressure clay slurry in the range of 1m above and below the argillaceous carbon soil and organic soil layer, and the spraying amount is controlled at 1.5 times the designed cement slurry volume;

[0022] c. After 14 days, after the composite clay slurry reacts fully with the undisturbed soil acid-base and reaches a certain strength, then spray the cement slurry with a certain admixture. The amount of cement slurry is controlled at 1.1 times the design amount, and the nozzle is 2.5mm. The slurry pressure is controlled at 30MPa, the rotating speed is 18r / min, and the lifting speed is 15-20cm / min.

[0023] The slurry is crushed and filtered with clay and mixed with water. The slurry is crushed and filtered wit...

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Abstract

The invention discloses a method for strengthening a jet grouting pile used in peat soil and organic soil. Lime and clay composite grout is sprayed in a peat soil body required to be strengthened with a high pressure jet grouting pile machine device to fill gaps in the peat soil, part of undisturbed soil is replaced, the acid-base property of the soil body is improved, and cement paste is sprayed after certain strength is achieved to form a solidification body to achieve the aim of strengthening the peat soil. The method is safe and effective, the problem that the cement grout in the peat soil and the organic soil cannot be solidified can be effectively solved, and the material waste and environment pollution phenomena caused by grout returning caused by the overlarge soil layer pressure are avoided.

Description

technical field [0001] The invention relates to a method for reinforcing rotary grouting piles in peaty soil and organic soil. Background technique [0002] In my country, peaty soil and organic soil are common in some areas. These two types of soil have characteristics of light soil quality, high water content, large void ratio, high compressibility, high organic matter content, low physical and mechanical indicators, and weakly acidic soil quality. features. The main component of organic matter in organic soil and peaty soil is humic acid, and humic acid is divided into three types: humin, fulvic acid and humic acid. Cement will produce a large amount of calcium ions when forming hydrates, and humic acid can react with calcium ions to form insoluble or insoluble precipitates, which consumes a part of calcium ions and affects the reinforcement of cement soil, resulting in The strength of cement soil is reduced. Fulvic acid has strong reducing ability and complexing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/46
Inventor 李旭杰李仲峰朱川鄂张成张永翔刘锐任金林
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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