Method for preparing composite material end plate for pre-stressed pile

Abstract

The invention provides a method for preparing a flaky unsaturated polyester plastic composite material of a composite material end plate for a pre-stressed pile. The method comprises the following steps of: preparing epoxy resin paste; and producing and curing an epoxy flaky molding material, wherein a middle core material of the epoxy flaky molding material consists of fibers which are dipped inthe epoxy resin paste; and the upper surface and the lower surface of the material are covered by a polyethylene film. The invention also provides a method for preparing the composite material end plate for the pre-stressed pile from the flaky unsaturated polyester plastic composite material. The composite material end plate provided by the invention can meet the requirements on pre-stressing tension in the process, has high manufacturability, can form different shapes according to the shape of the pile, has high corrosion resistance performance and can meet the requirement of various erosionenvironments without special treatment.

Description

technical field [0001] The present invention relates to an end plate used at both ends of a prestressed pipe pile or a square pile, in particular to a composite material used for the composite material end plate of the above-mentioned type of prestressed pile and the use of the composite material to prepare the end plate Methods. Background technique [0002] CN 101054800 A discloses a prestressed high-strength concrete square pile and its manufacturing method and forming mold. The concrete square pile includes a reinforcement cage and stick concrete; the two ends of the square pile are provided with metal end plates connected with the reinforcement cage. There is a round hole in the center of the square end plate. Tension holes and threading holes on both sides of the tension hole are symmetrically arranged between the round hole and the four sides. The symmetrical threading holes and tension holes are symmetrical to the holes on the two opposite sides. Each tension hole A...

AI Technical Summary

Problems solved by technology

At present, the most commonly used connection is welding, which uses metal end plates. Since both the steel mold and the end plates are made of metal, the contact between them is not very good, and it is easy to leak grout, which affects the quality and appearance of the finished product; during the construction process, the end plate When the flatness of the plate does not meet the requirements or tilts, the pile sinking process will be interrupted. When connecting the piles, it takes about 15 minutes to weld. After welding, it must be cooled naturally for 8 minutes, which greatly reduces the pile sinking speed.

Due to the different quality of welding at the construction site, it is easy to desolder and crack at the weld during pile sinking, which seriously affects the quality of pile sinking

Metal materials are easily corroded in the soil. When the welds are corroded, the entire pile foundation project will not be able to bear the bearing capacity of the upper layer, greatly reducing the service life of the building

[0004] That is to say, in the current process of pile manufacturing and use, the following problems have occurred in the metal end plate: 1. The steel mold and the end plate are all metal materials, and the contact between them is rigid contact, so it is difficult to achieve a tight seal, and it is easy to leak Pulp, affecting the quality and appearance of the finished product

2. During the construction process, because the steel is easily deformed due to the influence of temperature, the joint surface is not tightly occluded, and it takes about 15 minutes to weld, and it must be naturally cooled for 8 minutes after welding, which reduces the speed of pile sinking and construction welding The quality is different, and the welding seam is easy to be desoldered or cracked, which seriously affects the quality of the pile sinking

3. The existing end plate has poor corrosion resistance and is easy to rust

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