Manufacture method of prestressed reinforced concrete piles

Abstract

A manufacture method of prestressed reinforced concrete piles includes the following steps: adopting a bedding-in to install a reinforcement cage, before mold assembly, using a stretch-draw appliance to symmetrically stretch and draw main reinforcements along the circumferences of a stretch-draw plate and an end plate to 10% of a first pass yield (FPY) standard value, after the upper half mold and the lower half mold are combined, symmetrically fastening bolts, and using the stretch-draw appliance to symmetrically stretch and draw the main reinforcements along the circumferences of the stretch-draw plate and the end plate to 105% of the FPY standard value, maintaining the load for 2 min and retracting to 100% of the FPY, locking an anchorage device, detecting after 10-20min, after the supplement stretch is qualified, hanging the mold in a standing mode, moving the mold into a vertical kiln and fixing the mold, after the tensile stress is supplemented, installing concrete hopper pouring concrete from an upper end plate center hole, then inserting a penetrating vibrator into pile core concrete, vibrating from the bottom end of the pile, and pulling the penetrating vibrator outwards step by step, until the whole pile core concrete is vibrated compactly; and after the pile concrete is poured, sealing the kiln and heating for maintenance, the longitudinal temperature in the kiln is maintained balanced and 60-80 DEG C, heating continuously for at least 24h, then hanging the mold out of the vertical kiln for releasing the tensile stress, further disassembling mold plates, cutting off the exposed main reinforcements, and carrying out normal temperature maintenance for at least 5 days.

Description

technical field [0001] The invention relates to a method for manufacturing a reinforced concrete pile, in particular to a method for manufacturing a prestressed reinforced concrete pile capable of ensuring uniform concrete strength of the pile body. Background technique [0002] In construction engineering design, it is difficult for ordinary reinforced concrete prefabricated piles to reach 4-5N / mm 2 of tensile stress. Therefore, under normal circumstances, during the process of sinking piles into the soil, cracks will inevitably appear in prefabricated piles, especially in the process of stacking, transportation, hoisting and erection of slender piles. When the pile is in the ground, its durability will also be affected due to water seepage and erosion of harmful substances. And even if the reinforcement ratio is increased, it is still difficult to solve the problem of cracks in the pile body. First, the service life of the pile cannot be guaranteed, and second, the proje...

AI Technical Summary

Problems solved by technology

When the pile is underground, its durability will also be affected due to water seepage and erosion of harmful substances.

Even if the reinforcement ratio is increased, it is still difficult to solve the problem of cracks in the pile body. First, the service life of the pile cannot be guaranteed, and second, the project quality cannot be guaranteed.

At the same time, although the prestressed pipe piles currently used have improved the crack resistance of the piles, because the thin-walled pipe piles have poor anti-seepage and corrosion resistance, and are not resistant to impact, their tensile bearing capacity and shear resistance are low. During construction, the pile body is prone to brittle fracture, fragmentation, main reinforcement pier head falling off to end plate failure, which affects the quality of pile connection