Method for processing prestress square pile

Abstract

The invention relates to the construction field. The processing method of a pre-stress square pile includes the steps that: firstly, bar sheathing, wherein, a main octagonal reinforced bar is sheathed in an inner octagonal spiral hoop bar according to a hole position and then a main tetragonal reinforced bar is sheathed in a tetragonal position in a tetragonal hoop bar and the two ends are locked tightly by anchorages; secondly, tensioning, wherein, the main reinforced bar is tensioned by sections in a tensioning platform to 105 percent of the tension and then anchoring is carried out; thirdly, casting, wherein, the concrete casting is conducted in compound die after the inspection of tension and when the strength of the concrete meets the requirements, the reinforced bar is released and the unwanted main reinforced bar is cut; fourthly, finishing operation is carried out. Compared with the similar processing method, the method of the invention does not need pre-cast reinforced cage, and the bar sheathing can be directly conducted in the tensioning platform; the hoop bar is a spiral bar, thus having convenient installation but no breaking end, saving time and labor and having no need for wielding. The processing method of the invention can be used for pre-making solid pile or hollow pile in various sizes, thus increasing the anti-cracking strength and the limit bending moment of the pile body and prolonging the service life to 50 to 100 years.

Description

1. Technical field: [0001] The invention relates to the field of building construction, in particular to a square pile production method. 2. Background technology: [0002] In the design of pile foundation, ordinary reinforced concrete piles cannot bear 4-5N / mm 2 Tensile stress. Under normal conditions, cracks will inevitably appear when the pile is hammered into the soil. For slender piles, cracks will also appear during stacking, transportation, hoisting, and erection. When the pile is underground, the cracks will seep The erosion of harmful substances will inevitably affect its durability. Therefore, in ordinary reinforced concrete piles, although a large number of steel bars are configured, it is still difficult to solve the problem of cracks in the pile body, and the service life of the pile cannot be guaranteed. Prestressed concrete piles can effectively improve the crack resistance of piles. Pre-set reinforcement cages are used, and the reinforcement cages require 50...

AI Technical Summary

Problems solved by technology

[0002] In the design of pile foundation, ordinary reinforced concrete piles cannot bear 4-5N / mm 2 Tensile stress. Under normal conditions, cracks will inevitably appear when the pile is hammered into the soil. For slender piles, cracks will also appear during stacking, transportation, hoisting, and erection. When the pile is underground, the cracks will seep The erosion of harmful substances and harmful substances will inevitably affect its durability. Therefore, in ordinary reinforced concrete piles, although a large number of steel bars are configured, it is still difficult to solve the problem of cracks in the pile body and cannot ensure the service life of the pile.

Prestressed concrete piles can effectively improve the crack resistance of piles. Pre-set steel cages are used, and the steel cages need 50-100 stirrups to tighten the main reinforcement at a certain distance, and then the molds are cast and maintained. The production process of stressed concrete piles is complicated, and the production of steel cages is time-consuming and laborious, which increases the production cost of prestressed concrete piles

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