Large-cross-section driven-casing cast-in-place post-grouted concrete hollow square pile and production method thereof

Abstract

The invention provides a large-cross-section driven-casing cast-in-place post-grouted concrete hollow square pile, which structurally comprises a cast-in-place outside-square inside-circular pile body. A reinforcement cage is disposed in or not disposed in the outside-square inside-circular pile body. A post-cast pile cap is arranged at the top of the outside-square inside-circular pile body, and a precast pile tip is arranged at the bottom of the outside-square inside-circular pile body. The invention further provides a production method of the large-cross-section driven-casing cast-in-place post-grouted concrete hollow square pile. The large-cross-section driven-casing cast-in-place post-grouted concrete hollow square pile and the production method thereof have the advantages that using the construction method guarantees substantial equation between single-pile bearing capacity and pile axial load strength provided by resistance of pile periphery soil and pile end oil; the large-cross-section driven-casing cast-in-place post-grouted concrete hollow square pile compared with piles of the same size has larger inertia moment and larger perimeter and higher horizontal and flexural rigidity, and reinforcement is facilitated; the pile is high in horizontal bearing capacity; construction cycle of projects such as a pile foundation, foundation pit supporting, a composite foundation and the like is shortened, construction equality is improved, site environment pollution is avoided, and construction costs are economized; the effect of the pile used for foundation engineering with deep and thick soft soil layers is more evident, and the pile is convenient in application and has broad prospects.

Description

technical field [0001] The invention relates to the technology of pile foundation engineering structure, in particular to a grouting hollow square pile after pouring concrete with a large-section immersed tube and a manufacturing method thereof. Background technique [0002] 1. In the treatment of weak foundations, pile-type reinforcements are often set in weak foundations, and composite foundations are formed by pile-type reinforcements and in-situ foundation soil. The characteristic value of the bearing capacity of the composite foundation shall be determined through the field foundation load test, and may also be estimated according to the following formula. [0003] f spk = m R a A p + β ( 1 - m ) f sk ...

AI Technical Summary

Problems solved by technology

[0017] 3. In the pile support structure such as bored piles and cast-in-place concrete pipe piles in the foundation pit support project, when calculating the horizontal deformation coefficient of the pile, the calculated width of the pile is 0.9 times that of the square pile of the same size. , the horizontal bearing capacity of the single pile provided by the resistance of the soil is small, the moment of inertia, horizontal and bending stiffness of the circular and circular sections are small, which is not conducive to reinforcement, and the strength of the pile body and the strength of the reinforcement cannot be fully utilized

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