Method for manufacturing prestressed centrifugal anti-corrosion concrete hollow square piles through pre-tensioning method

Abstract

The invention discloses a method for manufacturing prestressed centrifugal anti-corrosion concrete hollow square piles through pre-tensioning method. The method comprises the steps of 1) designing of a concrete mix proportion and anti-corrosion concrete preparing; 2) pouring; 3) end plate model selection and assembly; 4) pile point model selection and assembly; 5) tensioning, centrifugal shaping and steam curing; and 6) releasing, demolding and high-pressure steam curing to obtain finished products. According to the method, mineral admixtures and anti-corrosion materials outstanding in anti-corrosion performance are added in concrete, a concrete mix proportion is reasonably designed, and the anti-corrosion performance of concrete is improved, accordingly, the durability and the anti-corrosion performance of centrifugal steam curing precast piles and pile foundations are improved, the service life problem of concrete and reinforced concrete in corrosive media and environments is solved, and the safety of building materials and building foundations is improved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for manufacturing a pretensioned prestressed centrifugal corrosion-resistant concrete hollow square pile. Background technique [0002] The pretensioned prestressed concrete hollow square pile is a hollow square concrete prefabricated component made of prestressed steel bars and high-performance concrete as the main materials, using the pretensioned prestressed centrifugal forming process, and steam curing. [0003] Due to the vast territory of our country, the marine environment is different and the climate is diverse, such as humid heat, carbonization and chloride salt corrosion in the southeast coastal areas, freeze-thaw, carbonization and chloride salt corrosion in the northern coastal areas, and dry cold, dry heat, chloride salt corrosion in the western salt lake area. And sulfate corrosion, making the damage form of precast concrete more common and complex. [00...

AI Technical Summary

Problems solved by technology

[0005] Compared with cast-in-place concrete, the research on corrosion resistance and durability of precast concrete and the development of related technologies are seriously insufficient

In 2006, a study conducted by Zhongshan Sanhe Building Materials Co., Ltd., Shenzhen Graduate School of Tsinghua University, and the Institute of Materials Engineering of Tongji University concluded that the widely used prestressed high-strength concrete mixed with fine sand and produced by autoclaving The durability of the pile is low, so it is not suitable for pile foundation projects that require frost resistance, chloride ion penetration resistance and sulfate corrosion resistance under dry-wet cycle conditions.

This shows that steam-cured concrete members are more prone to corrosion resistance problems than naturally cured members

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