Construction method for eliminating collapsibility of cement stirring insertion pile in collapsible loess area

A technology of collapsible loess and cement mixing piles, applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of low foundation bearing capacity, long construction time, limited depth of water injection holes, etc., to improve bearing capacity , The effect of improving the bearing capacity of the pile and shortening the construction period

Pending Publication Date: 2022-01-28
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional pre-soaking method takes a long time to construct, the depth of the water injection hole is limited, and the bearing capacity of the foundation after treatment is low

Method used

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  • Construction method for eliminating collapsibility of cement stirring insertion pile in collapsible loess area
  • Construction method for eliminating collapsibility of cement stirring insertion pile in collapsible loess area
  • Construction method for eliminating collapsibility of cement stirring insertion pile in collapsible loess area

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0032] A construction method for eliminating collapsibility by inserting piles into cement mixing piles in collapsible loess areas, specifically according to the following steps:

[0033] 1) Level the site before construction, measure and stake out according to the design drawings, and calibrate the position of each cement mixing pile (such as figure 1 shown).

[0034] 2) According to the geological survey report and superstructure requirements, according to the "Technical Specifications for Building Pile Foundations" (JGJ94-2008) and "Building Standards for Collapsible Loess Areas" (GB50025-2018), determine the elimination of negative friction resistance on the side of the cement mixing pile inserted into the pile In order to determine the collapsible loess layer collapsible treatment area, depth and remaining collapsible amount around the pile.

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Abstract

The invention discloses a construction method for eliminating collapsibility of a cement stirring insertion pile in a collapsible loess area. The method comprises the following steps of stirring for three times during construction of the cement stirring insertion pile, stirring for the first time, in the depths of a bearing stratum and a non-collapsible soil layer, spraying cement slurry by a stirring pile machine to stir and rise; in the depth of the collapsible loess layer, the stirring pile machine ascending by spraying water and stopping ascending to the ground; secondary stirring being conducted, specifically, secondary stirring sinking being conducted on the stirred soil layer, stirring sinking being conducted while water spraying is conducted on the collapsible loess layer, and sinking being conducted while cement slurry spraying is conducted on the bearing layer and the non-collapsible soil layer; third stirring for the third time, stirring and rising the stirred soil layer for the third time, rising while spraying cement slurry in a supporting layer and a non-collapsible soil layer, stirring and rising while spraying water in a collapsible loess layer, and finishing the construction of the stirring pile when the water content of the stirring soil around the pile needs to be saturated.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to a construction method for eliminating collapsibility by inserting cement stirring piles in a collapsible loess area. Background technique [0002] my country's loess covers a vast area of ​​more than 600,000 square kilometers, of which the collapsible loess covers about three-quarters of the total loess area, mainly distributed in Shanxi, Shaanxi, Gansu and other regions. The loess covering depth in these areas can reach more than 100m, and the collapsible loess thickness can reach 20-30m. The collapsibility of collapsible loess means that under a certain pressure, collapsible loess will undergo collapsible deformation with large amount of deformation and fast deformation speed after being soaked by water, which is sudden and uneven. If buildings or structures are built directly on the natural foundation of collapsible loess, unpredictable engineering accidents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/34E02D5/46E02D15/04
CPCE02D27/34E02D5/46E02D15/04E02D2250/0023
Inventor 朱彦鹏芮佳成栋王文龙董怀堂李芳川范金新黄涛
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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