Large-diameter cavity long spiral thin-wall cast-in-situ pile casing and pile-forming construction method

Abstract

The invention discloses a large-diameter cavity long spiral thin-wall pouring pile sleeve which comprises an outer pipe with two ends open and an inner pipe. An outer wall of the outer pipe is provided with spiral fan blades, the inner pipe is sleeved with the outer pipe, a plurality of evenly distributed locating clamping grooves are fixedly welded to the bottom of an inner wall of the outer pipe, and a plurality of wedge-shaped blocks are evenly distributed on the end face of the bottom of the outer pipe along the perimeter. A plurality of evenly distributed clamping strips matched with the clamping grooves are fixedly welded to the bottom of an outer wall of the inner pipe, and the inner pipe is sleeved with the outer pipe through the matching between the clamping grooves and the clamping strips. The pile sleeve construction method comprises a first step of clearing the site, inserting the clamping strips in the clamping grooves, and achieving movable connection between the inner pipe and the outer pipe; a second step of performing drilling in the pile sleeve; a third step of lifting the inner pipe upwards to enable the clamping strips to be separated from the clamping grooves and perform rotation dislocation, and inserting the inner pipe back; a fourth step of pulling out the outer pipe; a fifth step of clearing hole bottom sediment; a sixth step of placing a reinforcement cage and pouring concrete; a seventh step of pulling out the inner pipe while pouring the concrete and utilizing the inner pipe to tamp the concrete; and an eighth step of forming a pile. The large-diameter cavity long spiral thin-wall pouring pile sleeve has the advantages that the power requirements for long spiral drilling machine are low, bearing capacity can be obviously improved under the same concrete use quantity, earth is taken simply and efficiently, and the construction is safe.

Description

technical field [0001] The invention relates to a cast-in-place pile sleeve, in particular to a large-diameter cavity and long spiral thin-walled cast-in-situ pile sleeve; the invention also relates to a construction method for forming a pile by using the pile sleeve. Background technique [0002] In pile foundation engineering, the long helical drilling pile driver is a pile driver widely used in construction sites. Driven by power, the drill bit under the main drill pipe and the long helical fan blade set on the main drill pipe can The pile hole is drilled permanently, and then the hollow main drill pipe is used to pour concrete into the pile hole to form a pile. The long auger drilled cast-in-situ pile has the advantages of high bearing capacity, wide applicable stratum range and freely changeable pile length, etc., and is widely used. However, the application of long auger drilling rigs in large-diameter cast-in-place piles is limited. Generally, it can only be used when...

AI Technical Summary

Problems solved by technology

[0002] In pile foundation engineering, the long helical drilling pile driver is a pile driver widely used in construction sites. Driven by power, the drill bit under the main drill pipe and the long helical fan blade set on the main drill pipe can The pile hole is drilled permanently, and then the hollow main drill pipe is used to pour concrete into the pile hole to form a pile. The long auger drilled cast-in-situ pile has the advantages of high bearing capacity, wide applicable stratum range and freely changeable pile length, etc., and is widely used. However, the application of long auger drilling rigs in large-diameter cast-in-place piles is limited. Generally, it can only be used when the diameter of cast-in-place piles is less than 800mm. Soil cutting resistance, the power of the long auger can not meet the requirements

[0003] In the construction of foundation pile foundation engineering, the construction of super-large and ultra-deep pile foundation engineering piles is more common. For large-diameter cast-in-place piles, at present, the more advanced technology is to use large-diameter thin-walled cast-in-situ pile technology, which is a method of sinking Pipe, soil, formwork, hole clearing, reinforcement cage placement, concrete pouring, pipe drawing, formwork removal, backfilling, and pile-forming construction techniques. This construction technique can reduce the amount of concrete under the same bearing capacity requirements. The advantage of reducing the cost or increasing the flexural strength of the pile body significantly under the same amount of concrete; the existing defect is that for large-diameter thin-walled cast-in-situ piles, the soil is generally excavated by full-section manual excavation or mechanical excavation. Adopting this construction method is not only a waste of labor, but also the construction personnel need to reach the bottom of the pile hole when installing the formwork, and the construction process has certain dangers

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