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A two-way mixing method for making bottom-expanding powder-sprayed piles using alkali slag

A technology of two-way mixing and base powder expansion, applied in sheet pile wall, construction, infrastructure engineering, etc., can solve the problems of poor integrity, poor economy, and high cost, so as to improve the integrity of the pile body, improve the overall bearing capacity, improve the The effect of end resistance

Active Publication Date: 2022-02-11
STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For soft soil with high water content, only cement is used as the curing agent or conventional dosage of cement is used as the curing agent. In the actual use process, it is often found that the powder jetting pile has low curing strength and poor integrity, and cannot achieve the ideal curing effect; dose, the cost is high and the economy is poor

Method used

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  • A two-way mixing method for making bottom-expanding powder-sprayed piles using alkali slag
  • A two-way mixing method for making bottom-expanding powder-sprayed piles using alkali slag

Examples

Experimental program
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Embodiment 1

[0052] (1) Level the site, put the two-way mixing pile driver in place, ensure that the shaft of the pile driver remains vertical, and the inclination of the drill pipe of the drilling rig is less than 1.0%;

[0053] (2) Adjust the working radius of the stirring blade of the inner drill bit according to the diameter of the conventional pile body, control the connecting rod of the blade to shrink and rotate, and perform the first drilling (the drilling speed is 0.8m / min), the first ash spraying (alkali spraying) The amount of slag is 100kg / m) and the first stirring, construction conventional pile body, the diameter of the pile body is 500mm, after drilling to the top surface design elevation of the enlarged pile body; adjust the working radius of the inner drill bit stirring blade according to the diameter of the enlarged pile body, Control the extension of the connecting rod of the blade, continue the first drilling, the first ash spraying (the amount of alkali spraying slag is...

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Abstract

The invention provides a two-way stirring method for making bottom-expanding powder-sprayed piles by using alkali slag, and belongs to the technical fields of deep soft soil solidification treatment and solid waste utilization. The bottom-expanding powder-sprayed pile of the present invention includes a conventional pile body and an enlarged pile body; it is obtained by four spraying and four stirring. The invention uses alkali slag mixed with a small amount of cement as a solidification material, utilizes the high water absorption of the alkali slag to reduce the water content of soft soil within the range of the powder-sprayed pile body, and mixes a small amount of cement powder to increase the strength of the powder-sprayed pile. Two-way stirring method is adopted, four sprays and four stirs (four times of powder spraying and four times of stirring), the pile body is stirred evenly, and the integrity of the pile body is improved; the bottom of the powder spraying pile is expanded to increase the end resistance of the powder spraying pile, thereby improving The overall bearing capacity of the powder spraying pile. The data of the embodiment shows that the powder sprayed pile obtained by the present invention has good uniformity, the characteristic value of the average bearing capacity of a single pile is 176.5kN, and the average value of the unconfined compressive strength reaches 1.14MPa.

Description

technical field [0001] The invention relates to the technical field of deep soft soil solidification treatment and solid waste utilization, in particular to a two-way stirring method for making bottom-expanding powder-sprayed piles by using alkali slag. Background technique [0002] The powder-sprayed pile has the advantages of simple construction, rapid construction, and small disturbance, and is a common treatment method for deep soft soil foundations. [0003] At present, cement is commonly used as a curing agent, and the cement and the in-situ soft soil are forced to be stirred by a deep mixing machine. A series of physical and chemical reactions occur between the cement and the soft soil with high water content, and the soft soil hardens into a mixed columnar body with a certain strength. , thereby increasing the bearing capacity of the foundation and reducing the amount of foundation settlement. [0004] For soft soil with high water content, only cement is used as th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/46E02D15/00
CPCE02D5/46E02D15/00
Inventor 张魁赵晓晴宗钟凌鲁先龙孙海霞张胜林朱立位宋海勇林祥军何玲郁飞郑许林
Owner STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO
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