Prestressed spun concrete square piles and mould thereof

Abstract

The invention relates to a prestressed spun concrete square pile, comprising a square pile and a square metal end plate, wherein, the square pile consists of a reinforcing cage and the concrete. The reinforcing cage consists of a main reinforcement and a spiral hooping which is welded on the main reinforcement. The four arms of angle of the square pile and square metal end plate are all of circular arcs with the same radius of 10 to 40mm. The mould consists of an upper mould, a lower mould, a locking device and a hanging tight bolt. After the snap-fit of the upper mould and the lower mould, the inner chamber of the mould is square, wherein, the four interior arms of angle of the square are of circular arcs with the same radius. A locating pin is positioned at the joint part of upper mould and the lower mould; the hanging tight bolt is a coarse thread bolt, with the thread pitch of 2 to 4mm. The prestressed spun concrete square piles have the characteristics that the tensile stress of the main reinforcement is consistent after moulding and tension-releasing of the pile body, the concrete protective layer enfolded on the main reinforcement is uniform, the strength of the pile body is high; the hanging tight bolt on the mould of the prestressed spun concrete square pile has the advantages of high efficiency in folding and packing, long life and low cost.

Description

Technical field: [0001] The invention relates to a concrete pile and a forming mold thereof, in particular to a prestressed concrete hollow square pile and a forming mold thereof. Background technique: [0002] Existing prestressed concrete hollow square pile and forming mold thereof, such as Chinese patent "prestressed high-strength concrete square pile and its manufacturing method and forming mold", the patent number is 200710068545.6, prestressed high-strength concrete square pile comprises steel cage, concrete; There are square metal end plates connected to the reinforcement cage at both ends, welding grooves are set on the four sides of the two square metal end plates, and the center is a round hole, and threading holes and tension holes are symmetrically arranged between the round hole and the four sides; the stirrup of the reinforcement cage It is welded on the main reinforcement continuously in a spiral shape; the shape of the pile body and the end plate is square, a...

AI Technical Summary

Problems solved by technology

The upper mold and the lower mold are fixed by several hanging bolts. The hanging bolts are fine-threaded bolts with a pitch of 1.5mm. Due to the small pitch, the assembly efficiency of the hanging bolts is low. The impact force on the surface is large and easy to be damaged. When hoisting the upper mold and the lower mold, the lifting bolts touch the ground first, and the weight of the upper mold and the lower mold is also very easy to cause damage to the lifting bolts. user cost

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