Construction method for bored pile

Abstract

The invention discloses a construction method for a bored pile. The construction method comprises steps of preparing before construction, carrying out boring construction, implanting a wall retaining bag, descending a reinforcing cage and pouring concrete; first of all, the position of the bored pile is positioned; obstacles within an area influencing the pile foundation construction are cleaned up; a steel casing is embedded; a drilling machine is mounted; a pile hole of the cast-in-site pile is drilled; the cylindrical retaining wall bag of which the diameter equals to the inner diameter of the pile hole is implanted inside the pile hole; the wall retaining bag is sealed; the interior of the wall retaining bag is continuously inflated; the wall retaining bag is sufficiently expanded, so as to enable the wall retaining bag to be attached to the inner wall of the pile hole; the reinforcing cage is released downward; a grouting pipe is mounted above the reinforcing cage; concrete is poured from the grouting pipe into the drilled hole; when the pouring is completed, the steel casing is pulled out; the cast-in-site pile is solidified and formed. During the construction process of the bored pile provided by the invention, a slurry retaining wall is not required, so that the construction method for the bored pile is not only economical and environment friendly, but also the manufacturing cost is lowered; the wall retaining bag is adopted to replace the slurry retaining wall; operations are easy; construction steps are simplified; workload is reduced; the construction period is shortened.

Description

technical field [0001] The invention belongs to the technical field of pile foundations, and in particular relates to a construction method of bored piles. Background technique [0002] The cast-in-situ pile system refers to the pile holes formed in the foundation by means of mechanical drilling, steel pipe extrusion or manual excavation on the project site, and the piles are made by placing steel cages and pouring concrete in them. According to different hole-forming methods, Cast-in-situ piles can be further divided into countersinking piles, bored piles and excavated piles. Bored piles are a pile type defined according to the classification of pile-forming methods. [0003] The construction process of present bored cast-in-place pile generally adopts mud retaining wall, and its main function is to clean the bottom of the hole, carry drilling slag to balance the earth pressure, retaining wall to prevent collapse, lubricate and cool the drill bit. The use of mud retaining ...

AI Technical Summary

Problems solved by technology

The use of mud retaining wall has the following defects: 1. After the hole is formed, the mud needs to be replaced by concrete, which will pollute the environment and cause high production costs; 2. The mud retaining wall is cumbersome to operate and difficult to control: it is necessary to control the mud liquid level during the operation; It is necessary to control the specific gravity of the mud. If the specific gravity of the mud is too large, the water loss will be large, and the hole wall will be easily peeled off and disintegrated.

[0004] In summary, the current construction technology of bored piles needs to be improved

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