Prestressed reinforced concrete H-shaped support pile based on pre-tensioning method

Abstract

A prestressed reinforced concrete H-shaped support pile based on a pre-tensioning method comprises a standard pile section provided with a reinforcement cage, wherein the reinforcement cage is composed of erection reinforcing steel bars, an H-shaped steel hoop and an S-shaped steel hoop, the upper flat surface and the lower flat surface of the cross section of the reinforcement cage are provided with a plurality of horizontally and symmetrically arranged high-strength prestressed steel bars, the standard pile section is manufactured by the adoption of a steel die, the steel die comprises bottom channel steel and a turnable protruding side template, fixing stand columns are arranged on two sides of the protruding side template, pivots of the protruding side template are connected to two sides of the bottom channel steel, the upper ends of the fixing stand columns are connected with limiting channel steel, the two ends of the reinforcement cage are respectively provided with an end template provided with a plurality of horizontally-arranged through holes, and the through holes are matched with the prestressed steel bars. The prestressed reinforced concrete H-shaped support pile has the advantages that excellent anti-bending cross-section characteristic is achieved, and compared with a drilling poring pile normally adopted in a support pile, 40-50% of steel bars and 30-40% of concrete can be saved, and significant economic and technological effects are achieved.

Description

technical field [0001] The invention relates to a pile foundation of civil construction engineering, in particular to a pretensioned prestressed reinforced concrete I-shape supporting pile used in foundation pit enclosure engineering capable of bearing horizontal lateral earth pressure in deep foundation pit engineering . Background technique [0002] Existing surrounding protection piles usually adopt bored cast-in-place piles or immersed pipe-in-situ piles, and all adopt the construction method of cast-in-place piles on the construction site. Even if the construction of surrounding protection piles is completed, the poured piles must be excavated after the concrete reaches strength. foundation groove; its construction efficiency is relatively low; secondly, its section of the described bored pile or immersed pipe pile (not having the characteristics of low-squeeze soil property) is a circular section, so the mechanical characteristics of bearing horizontal lateral earth pr...

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Problems solved by technology

[0002] Existing surrounding protection piles usually adopt bored cast-in-place piles or immersed pipe-in-situ piles, and all adopt the construction method of cast-in-place piles on the construction site. Even if the construction of surrounding protection piles is completed, the poured piles must be excavated after the concrete reaches strength. foundation groove; its construction efficiency is relatively low; secondly, its section of the described bored pile or immersed pipe pile (not having the characteristics of low-squeeze soil property) is a circular section, so the mechanical characteristics of bearing horizontal lateral earth pressure are relatively low. It is not conducive to saving building material resources, and at the same time, the discharge of drilling mud will cause pollution to the surrounding environment; when bored piles or immersed pipe piles are usually used as enclosure piles, anti-seepage curtains are constructed on the outside of the enclosure piles, usually It is lapped by cement mixing piles or high-pressure jet grouting piles. Because it is not connected to the surrounding protection piles, the probability of foundation pit leakage is high

[0003] In addition, the utility model patent ZL 20121030503020424506.1 "Reinforced Concrete I-shape Support Pile" that the applicant has authorized has thick steel bars in its section, and the amount of steel used is large; and another utility model patent ZL 201320025300.6 that has been authorized by the applicant "Centrifugal pouring of prestressed reinforced concrete I-shaped cross-section support piles", in this patent, due to centrifugal pouring, process holes must be reserved, and the cross-section web must be thickened, thereby increasing the consumption of concrete materials; thus in terms of improving economic benefits are not ideal

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