Slurry protection wall construction method with holes formed in cast-in-situ bored pile sand soil layer

Abstract

The invention discloses a slurry protection wall construction method with holes formed in a cast-in-situ bored pile sand soil layer. The slurry protection wall construction method comprises the following steps: (1) before construction, a slurry pit is dug in advance, and artificial slurry making is conducted, wherein a mortar mixing drum is used for preparing slurry with a water-cement ratio ranging from 0.55 to 0.6, hyper-viscous swelling soil is used as raw materials, industrial alum which accounts for 0.8-1.2% of the hyper-viscous swelling soil in weight is added at the same time, and the specific gravity of the prepared slurry ranges from 1.2 to 1.35; (2) drilling is conducted, and the prepared slurry is pumped by a slurry pump and injected into drilled holes to form circulation so as to protect walls when an ore layer is drilled; (3) after the sand soil layer is drilled, clear water is added to the holes to reduce the specific gravity of the slurry to be within the range of 1.1-1.25 until hole forming is completed. The slurry protection wall construction method with the holes formed in the cast-in-situ bored pile sand soil layer has the advantages that compared with the prior art, the integrality of pile foundations is improved greatly under geological conditions provided with the sand soil layer, and the situation that a drilling bucket is buried or collapse occurs in the holes and other accidents due to poor quality are avoided; the concrete filling coefficient of pile shafts is reduced, and therefore the concrete consumption is reduced.

Description

technical field [0001] The invention relates to a construction method of building pile foundations, in particular to a construction method of mud retaining walls for forming holes in the sandy soil layer of bored piles, and belongs to the technical field of building construction. Background technique [0002] Mud is injected during the drilling process of the wall-retaining hole-forming cast-in-place pile. Its purpose is to protect the wall and discharge slag. Traditionally, natural slurry is mainly used to directly inject water to form mud, thereby making it suitable for different soil layers. It is difficult to adjust, especially in the sandy soil layer, it is easy to collapse in the hole and bury the drill. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a mud retaining construction method for forming holes in the sandy soil layer of bored piles, which can avoid quality accidents such as buried drilling and ho...

AI Technical Summary

Problems solved by technology

[0002] Mud is injected during the drilling process of the wall-retaining hole-forming cast-in-place pile. Its purpose is to protect the wall and discharge slag. Traditionally, natural slurry is mainly used to directly inject water to form mud, thereby making it suitable for different soil layers. Difficult to adjust, especially in sandy soil layer, easy to collapse in the hole and buried drill and other problems