A prestressed hollow concrete square pile and its forming method

Abstract

The invention discloses a prestress hollow concrete square pile which comprises a pile body, a circular through hole formed in the center of the pile body, a reinforcement cage, concrete and metal end plates. The metal end plates are arranged at the two ends of the pile body and are connected with the reinforcement cage. A stirrup of the reinforcement cage is welded to a main rib in a spiral-surrounding mode. The pile is characterized in that rust protection liquid is added into the concrete square pile. The invention further discloses a forming method of the prestress hollow concrete square pile. The method is characterized in that during a centrifugation forming process in which the concrete is placed into a centrifugation forming mould, the concrete is added, then the rust protection liquid is added, and then centrifugation forming is carried out. The prestress hollow concrete square pile has a rust protection function and is good in rust protection effect, and during storing, rust protection time can reach 2-3 years. According to the forming method of the pile, rust protection agents are added in the centrifugation forming step, the hollow concrete square pile can be generated, the production method has the advantages of being simple, burdens are avoided, operation is easy, and production efficiency reaches at least 95%-98%.

Description

technical field [0001] The invention relates to a prestressed hollow concrete square pile, which belongs to the improvement field of the concrete prestressed hollow square pile in the construction field. Background technique [0002] Existing prestressed concrete hollow square piles include reinforcement cages, concrete, metal end plates, a circular through hole in the center of the pile body, and the stirrups of the reinforcement cages are welded on the longitudinal bars in a spiral shape. The existing prestressed concrete hollow square piles The manufacturing method of the pile comprises the following steps of preparing a reinforcement cage with a spot welding machine: preparing a mold, and coating a release agent on the mold, installing the reinforcement cage on the mold and installing a tensioning device, feeding the prepared concrete into the steel Close the half-mold in the mold, pre-tension the steel bar according to the bending resistance grade of the product, lock a...

AI Technical Summary

Problems solved by technology

[0004] Although the centrifugally formed prestressed concrete hollow square pile has higher friction and bearing capacity with the ground than the pipe pile, there are still some problems to be solved. For example, the centrifugal forming will inevitably bring about internal and external delamination of the pile internal structure. This will affect the compression and impact resistance of the entire pile body. Therefore, how to control the centrifugal speed and improve the production method to solve the problem that the joints of the pile body are just on the opposite corners of the four sides, and it is not easy to cause grout leakage, etc.

[0005] On the other hand, as far as is known, the existing prestressed hollow concrete piles usually have no anti-rust function, which leads to steel rust easily occurring when the prestressed hollow concrete piles are stored for a long time, which affects the service life. And more importantly, it affects the use effect and leads to safety problems