Process for manufacturing centrifugal concrete pile

Abstract

The invention discloses a process for manufacturing a centrifugal concrete pile. The process comprises the following flows of: (1) manufacturing a reinforcement cage, and placing the manufactured reinforcement cage in a lower mold; (2) assembling an end plate, and inserting a main reinforcement into a counter bored hole to be welded with the end plate; (3) uniformly stirring cement, sand, stones, a superplasticizer and a mineral additive, then distributing materials, and closing the mold to obtain a concrete pile; (4) applying prestressing force to the main reinforcement at one end of the concrete pile by using a prestressing force reinforcement stretch-draw machine according to the requirements of production processes; (5) after the stretch-draw process is finished, performing centrifugal molding which is divided into four stages, namely a low-speed stage, a middle-speed stage, a middle-high-speed stage and a high-speed stage; (6) hoisting the concrete pile and the mold into a steam curing pond, curing, opening a kettle and transporting the pile; and (7) hoisting the pile-containing mold to a demoulding area, demoulding, and then hoisting to a storage yard. In the concrete pile manufactured by the process, the design value of bending bearing force of a pile body can be improved by more than 12 percent, and the design value of drawing bearing force can be improved by more than 10 percent.

Description

Technical field: [0001] The invention relates to a manufacturing process of a centrifugal concrete pile. Background technique: [0002] my country has only begun to introduce, develop and produce prestressed concrete pipe piles since the early 1980s. Since the 1990s, pipe piles have developed rapidly in my country, moving north from the coast of Guangdong. At the same time, with the help of the implementation of the central and western development strategy, pipe pile technology has been advancing all the way west. At present, my country's concrete pipe piles not only rank first in the world in terms of output, but also rank first in the world in terms of types. In recent years, prestressed concrete square piles have appeared in the market as a new pile type. The prestressed concrete square pile adopts the same centrifugal forming process as the prestressed concrete pipe pile, and has an appearance structure of an outer square and an inner circle, which is easy to fix and b...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high brittleness of prestressed concrete piles and insufficient horizontal bearing capacity of pile foundations, as well as the problems of low production efficiency of concrete square piles and difficulty in controlling and ensuring the quality of cast-in-situ piles, the present invention solves the problems of reinforcement ratio, selection of steel bars, and production process Starting from the same level, change the reinforcement and steel selection principles of the existing prestressed concrete pipe piles and prestressed concrete square piles, and produce centrifugal concrete piles that meet the seismic requirements without reducing the vertical bearing capacity of single piles

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