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Cement soil mixing pile construction method considering intensity uniformity

A technology of cement-soil mixing pile and construction method, which is applied in the direction of sheet pile wall, foundation structure engineering, construction, etc., can solve the problems of uneven distribution of cement slurry and uneven mixing of cement and soil, so as to improve the difference in soil strength and improve The effect of improving the pile quality and expanding the scope of application

Inactive Publication Date: 2019-06-11
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

[0003] The invention provides a construction method of cement-soil mixing piles considering the uniformity of strength, which solves the problems of uneven mixing of cement-soil and uneven distribution of cement slurry in the pile body, thereby improving the pile quality of the mixing pile and expanding the size of the cement-soil pile. Application range of mixing pile

Method used

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  • Cement soil mixing pile construction method considering intensity uniformity
  • Cement soil mixing pile construction method considering intensity uniformity

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Embodiment approach

[0033]According to an embodiment of the present invention, preferably, the drill rod of the mixer has a forward and reverse rotating agitating drill bit, so as to ensure better empty mixing quality and improve mixing uniformity.

[0034] According to the technical solution of the present invention, step S5) after lifting the drill pipe of the mixer to the predetermined depth, turn on the slurry pump to spray cement slurry into the soil, and simultaneously control the drill pipe of the mixer to rotate downward for stirring Operation: While spraying the cement slurry, the sprayed cement slurry is fully mixed with the soil by stirring.

[0035] According to one embodiment of the present invention, in step S5) in the case that the water content of the actual soil is relatively high, the water-cement ratio of the cement slurry can be selected to be 0.5, and the specific gravity of the slurry is determined to be 1.823, so that the water-cement ratio after the air stirring The soil p...

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Abstract

The invention provides a cement soil mixing pile construction method considering intensity uniformity, which comprises the following steps that a construction site is levelled, and construction positions of a plurality of unconstructed mixing piles are determined; a mixer aligns with the center position of one of the unconstructed mixing piles, and positioning of the mixer is carried out; the mixer is started to perform empty agitation sinking operation, and a drill pipe of the mixer is controlled to sink to a predetermined depth while cutting soil; the drill pipe of the mixer is controlled tocontinue to sink and simultaneously stir the soil until a design depth is reached; after the drill pipe of the mixer is lifted to the predetermined depth, a slurry sending pump is turned on to spraycement slurry into a soil body, and the drill pipe of the mixer is controlled to rotate downwards to perform stirring operation; when the drill pipe of the mixer rotates downwards to the design depth,the drill pipe of the mixer is lifted to rotate upwards to perform stirring operation, and when the drill pipe of the mixer is lifted to the earth surface or a predetermined distance above design elevation, the construction of the mixing pile is completed; and the steps are repeated until the construction of all the mixing piles is completed.

Description

technical field [0001] The invention relates to the technical field of foundation treatment, in particular to a construction method for cement-soil mixing piles considering strength uniformity. Background technique [0002] The cement-soil mixing method is a foundation treatment method used to strengthen soft soil and weak soil. The existing cement-soil mixing piles are difficult to control the grouting pressure and grouting amount due to the large difference in soil strength. Or two-way mixing process, in the construction of soft soil foundation with obvious bedding structure and large difference in soil strength, there are still problems of uneven mixing of cement and soil and uneven distribution of cement slurry in the pile body. Contents of the invention [0003] The invention provides a construction method of cement-soil mixing piles considering the uniformity of strength, which solves the problems of uneven mixing of cement-soil and uneven distribution of cement slur...

Claims

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Application Information

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IPC IPC(8): E02D5/46
Inventor 申慧涛李心平叶朝良杜同坤杨钊
Owner CHINA RAILWAY 12TH BUREAU GRP
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