Prestressed centrifugal square pile

Abstract

The invention provides a prestressed centrifugal square pile. The square pile comprises a pile body formed by concrete and a reinforcement cage, wherein the reinforcement cage comprises a main reinforcement and a reinforcement stirrup; the reinforcement stirrup is spirally and continuously welded on the main reinforcement; both ends of the pile body are provided with end plates connected with the reinforcement cage; a hoop is arranged at a joint of the end plate and the pile body; the pile body is square in appearance and corners on four sides of the pile body are provided with a pair of stress relieving arc angles and a pair of right angles; the radius R of the arc angles is 5-9mm; the length L of the hoop is 110mm-320mm; the hoop is provided with 2-4 bulges with the radius of 1-3mm along the axial direction of the pile body; the main reinforcement is parallel to an outline of the pile body and is provided with an upset head at the joint with the end plate. The prestressed centrifugal square pile has the advantages of material saving, light self weight, no easy damage, good pile body ductility, high pile bearing capacity and good bending resistance. The pile body has a high concrete strength of C60-C80; the bearing capacity provided by a single pile is 30% higher than the ordinary process, the economical efficiency is high, and the cost is saved by nearly 25%.

Description

technical field [0001] The invention belongs to the construction field, and relates to the improvement of the shape and structure of a foundation pile in the construction field, in particular to a prestressed centrifugal square pile. Background technique [0002] Traditional square piles, sinking pipe piles, etc. have relatively low bearing capacity of single piles, poor bending (tensile) and shear resistance, long construction period, and pile quality does not meet the design requirements; piles are damaged during transportation and use Seriously, it will lead to poor durability of pile concrete. The surface of the prefabricated pile is smooth, and the friction between the pile material and the soil layer is small. There is also a prestressed centrifugal concrete square pile with an end plate at the pile end, which has light weight, saves material, is convenient for hoisting and transportation, and has a large bearing capacity of the pile body. However, the layout of its ...

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Problems solved by technology

[0003] Since the four corners are arc angles with the same radius, it is also necessary to ensure that the distance from the outermost side of the arc at the corner of the square pile to the outside of the main reinforcement at the corner of the reinforcement cage is equal to the right angle from the periphery of the square pile to the reinforcement cage. The outer distance of the main reinforcement on the side, so that although the thickness of the concrete protective layer wrapped around the main reinforcement of the reinforcement cage is ensured, the location of the reinforcement reinforcement is close to the central hole, so that the bending resistance is correspondingly reduced, and the safety is poor.

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