Large-diameter cavity long spiral thin-wall cast-in-place pile casing

Abstract

The invention discloses a large-diameter hollow-cavity long-spiral thin-wall bored concrete pile casing which comprises an outer tube and an inner tube. The outer tube with both ends open is hollow inside and sleeves the inner tube. A spiral blade is arranged on the outer wall of the outer tube, and the lower end of the spiral blade extends out of the lower end of the outer tube. A plurality of grooves are uniformly formed in the inner wall of the outer tube along the circumference and the length, balls mounted in the grooves are capable of rotating in any angle freely, thus socket jointing between the inner tube and the outer tube is achieved. Besides, soil cleaning plates are mounted at positions, close to the bottom end of outer tube, of the inner wall of the outer tube circumferentially. The large-diameter hollow-cavity long-spiral thin-wall bored concrete pile casing has the advantages of low requirement for power of long-spiral drilling machines and high bearing capacity on the condition of same concrete usage as compared with existing long-spiral drilling bored concrete pile casings and further is wide in stratum application range, easy and efficient in soil taking and safe in construction.

Description

technical field [0001] The invention relates to a cast-in-place pile casing, in particular to a large-diameter cavity, long spiral thin-walled cast-in-place pile casing. 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 the diameter of cast-in-place piles is less than 800mm. Cutting soil resistance, the power of lon...

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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