Cast-in-place pile construction method

Abstract

The invention relates to the technical field of housing building and provides a cast-in-place construction method to solve the problem that a concrete contaminated soil layer has a large range. The cast-in-place construction method includes: (1) leveling a site; (2) drilling a hole, wherein the diameter of a pre-pile hole is less than that of a pile hole in a design drawing; (3) expanding the hole, to be specific, placing a water bag into the pre-pile hole at the premise that the outer diameter of the water bag is equal to the diameter of the pile hole in the design drawing and the length of the water bag is equal to the depth of the pile hole in the design drawing, injecting water into the water bag until water pressure is greater than 1 MPa, allowing standing for at least 10 min, relieving the pressure, drawing water, and removing the water bag to form a finished pile hole; (4) sinking a reinforcement cage inside; (5) casting concrete; (6) removing a pile head by breaking. The diameter of the pre-pile hole is less than the diameter of the pile hole in the design drawing; the water bag is internally pressurized to restore, and then the wall of the pre-pile hole is extruded to arrive at hole expanding so that the wall soil layer of the finished pile hole is compact; therefore, the range of concrete leaking from the wall of the hole to the soil layer during casting is narrowed,and the range of the concrete contaminated soil layer is narrowed.

Description

technical field [0001] The invention relates to the technical field of house construction, more specifically, it relates to a construction method of cast-in-place piles. Background technique [0002] Cast-in-place pile is a kind of pile made by forming holes in place and pouring concrete or reinforced concrete. Commonly used are bored cast-in-place piles: piles are formed by pouring concrete into holes on the spot with an auger drilling machine. There is no vibration and no soil squeezing during construction, but the settlement of the piles is slightly larger. The auger drilling rig is suitable for cohesive soil, sandy soil and artificial filling soil above the groundwater level. The drilled soil block rises along the helical blade on the drill pipe and is discharged out of the hole. The hole diameter is about 300mm, and the drilling depth is 8-12m. Soil quality and water content to select drill pipe. Due to the advantages of no vibration, no soil extrusion, low noise, and...

AI Technical Summary

Problems solved by technology

[0003] However, since the cast-in-situ pile has no soil squeezing effect, the inner wall of the pile hole is relatively soft. When pouring concrete, a large amount of concrete penetrates into the gaps in the soil layer on the inner wall of the pile hole, which makes the concrete pollute the soil layer in a larger range, so there is still room for improvement.