Large-diameter cast-in-situ bored pile head overall breaking system and construction method

Abstract

The invention belongs to the technical field of cast-in-situ pile construction. A large-diameter cast-in-situ bored pile head overall breaking system comprises a pile head separation support, isolation sleeves, a first counter-force frame, a second counter-force frame and a driving part, wherein the first counter-force frame and the second counter-force frame are correspondingly arranged up and down; the multiple isolation sleeves are arranged on the pile head separation support, longitudinal main ribs on the upper portion of a steel reinforcement cage of a cast-in-situ pile are arranged in the isolation sleeves in a matched and penetrating manner, and the pile head separation support and the isolation sleeves are poured on the top of the cast-in-situ pile; and a plurality of first counter-force holes are circumferentially distributed in a pile head of the cast-in-situ pile, a plurality of second counter-force holes are circumferentially distributed in the position, on the lower portion of the pile head separation support, of the cast-in-situ pile, and the first counter-force frame and the second counter-force frame are correspondingly arranged in the first counter-force holes and the second counter-force holes correspondingly. The invention further discloses a large-diameter cast-in-situ bored pile construction method. The large-diameter cast-in-situ bored pile head overall breaking system is reasonable in overall design, the problem existing in breaking of the pile head of the large-diameter cast-in-situ bored pile in the prior art can be solved, the breaking efficiency is improved, and the structural damage to a pile body is reduced.

Description

technical field [0001] The invention belongs to the technical field of cast-in-situ pile construction, and in particular relates to a large-diameter bored cast-in-place pile head integral breaking system and a construction method. Background technique [0002] During the construction of bored piles, in order to ensure the pouring quality of the pile body concrete of the bored piles, the pile body is usually overfilled. After the pile body concrete reaches the design strength, the overfilled pile head part is chiseled off. The existing pile head removal method is mainly to manually remove the concrete at the pile head with the help of small mechanical equipment such as jacks. This method has a large workload on site and a slow construction speed. During the pile head concrete removal process, the borehole is easily damaged. The longitudinal main reinforcement of the cast-in-place pile affects the stress of the structure. [0003] In the existing related construction technolo...

AI Technical Summary

Problems solved by technology

The existing pile head removal method is mainly to manually remove the concrete at the pile head with the help of small mechanical equipment such as jacks. This method has a large workload on site and a slow construction speed. During the pile head concrete removal process, the borehole is easily damaged. The longitudinal main reinforcement of the cast-in-situ pile affects the stress of the structure

[0003] In the existing related construction technology, before the pile foundation concrete is poured, materials such as PVC sleeves are used to wrap the longitudinal main reinforcement at the top of the steel cage to avoid direct contact between the longitudinal main reinforcement at the pile head and the concrete; after the pile foundation concrete is poured, the pile Between the pile head and the pile body, the pile head is separated from the pile body by using a pick, steel wedge, etc., and then the pile head is lifted from the pile body as a whole. This construction method can better solve the problem of the grip between the pile head concrete and the longitudinal main reinforcement. However, when this method separates the pile head from the pile body, the efficiency of using mechanical equipment such as pneumatic picks is still low, and the longitudinal main reinforcement is easy to be damaged during the construction process.

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