Concrete pre-stress hollow square pile and molding method thereof

Abstract

The invention discloses a concrete pre-stress hollow square pile. The centre of the concrete pre-stress hollow square pile is provided with a central through hole which runs through the entire concrete pre-stress hollow square pile along the longitudinal axis of the concrete pre-stress hollow square pile; the cross section at the periphery of the concrete pre-stress hollow square pile is square; the cross section of the central through hole of the concrete pre-stress hollow square pile is also square; and the wall thicknesses from the four surfaces of the concrete pre-stress hollow square pile to the central through hole are the same. The invention also discloses a molding method of the concrete pre-stress hollow square pile. Because the concrete pre-stress hollow square pile is formed byvibration molding, the wall thickness of the concrete pile is consistent; thus the disadvantage of over-high pile failure rate produced due to non-uniform concrete distribution during the molding of the pile is prevented; meanwhile, the common fault of layering of inner and outer layers of the concrete produced by centrifugal molding, the problem of non-uniform concrete reinforcement protective layer due to confusing in a cast-in-place construction site and the influence of age of concrete on the working period are prevented.

Description

Technical field [0001] The invention relates to the improvement of concrete prestressed hollow square piles in the field of construction and the prefabricated production of cast-in-place concrete structural columns, in particular to the improvement of the existing concrete hollow square pile type and forming process. Background technique [0002] Existing concrete hollow square piles, the distribution of the pile’s ribs uses square reinforcements, with a round hole in the center. Most of them are formed by centrifugal molding. If the centrifugal speed is not well controlled in the centrifugal molding process, it is very easy to produce internal and external stratification and reduce the pile The overall structural performance of the body, the pile body is easily damaged during pile sinking. [0003] In addition, precast concrete piles usually used for foundations include pipe piles, hollow square piles, and solid square piles. Among them, the forming process of pipe piles and holl...

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Problems solved by technology

[0004] Centrifugal forming will inevitably lead to internal and external delamination of the internal structure of the pile, which will affect the compression and impact resistance of the entire pile body

[0005] When the pipe piles are centrifugally formed, the wall thickness of the pipe piles is the same, and there will be no uneven distribution of concrete on the cross-section, but the concrete hollow square piles will have a cross-section with an outer square and an inner circle if the centrifugal formation is adopted, and the wall of the pile The thickness is not the same, and the concrete is unevenly distributed on the cross-section. When the pile is sunk by the holding pressure method, cracks will often be generated at the thinnest part of the concrete in the pile cross-section, and the pile damage rate is too high, resulting in waste. When the pile is sunk by the hammering method , it is possible that at the thinnest section of the pile body, longitudinal cracks will occur in the pile body due to excessive force, which will also cause excessive pile damage rate, which will not only cause waste of concrete, but also bury hidden dangers for the safety of the building

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