Construction method for slowly-bonded hollow prestressing floor slab through large-span ultra-thick cast-in-place post-tensioning method

Abstract

The invention discloses a construction method for a slowly-bonded hollow prestressing floor slab through a large-span ultra-thick cast-in-place post-tensioning method. The method includes the main construction steps of (1) bottom formwork laying, (2) reinforcing steel bar construction, (3) side formwork installation, (4) prefabricated hollow block installation and reinforcement, (5) concrete pouring, and (6) prestressing tension. Main floor slab reinforcing steel bars are connected with a side formwork, so that the position of a main reinforcing steel bar framework is fixed. Prefabricated hollow blocks are connected with the main floor slab reinforcing steel bars through anti-floating reinforcing steel bars. The good effect is achieved in dealing with floating of the hollow blocks. U-shaped clips are used for locating the hollow blocks in the horizontal direction. Slowly-bonded prestressing reinforcing steel bars are located through locating supports accurately. By the adoption of the construction method, the use amount of concrete is reduced, the construction efficiency is improved, the manufacturing cost is reduced, damage to the environment is reduced, and the economic and social benefits are good.

Description

technical field [0001] The invention relates to a construction method of a prestressed hollow floor slab, in particular to a construction method of a large-span ultra-thick cast-in-place post-tensioning slow bonded prestressed hollow floor slab. technical background [0002] In recent years, with the substantial improvement of the level of engineering technology and the increasing demand for individualization, the demand for open and large spaces in the domestic construction market has increased; prestressed hollow floor technology has the advantages of small weight, high rigidity, strong crack resistance, and strong deformation resistance. It has good adaptability to large-span and heavy-load structures. [0003] In the traditional hollow slab construction technology, most of the anti-floating prefabricated hollow blocks are connected and fixed with the main steel bars, and the buoyancy generated by the prefabricated hollow blocks is transmitted to the steel skeleton. Ther...

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Problems solved by technology

[0003] In the traditional hollow slab construction technology, most of the anti-floating prefabricated hollow blocks are connected and fixed with the main steel bars, and the buoyancy generated by the prefabricated hollow blocks is transmitted to the steel skeleton. There will be huge buoyancy in the poured concrete. If it is not handled properly, it may cause the steel bars and the bottom form to float up as a whole, and the formwork support will lose stability and collapse; traditional prestressed hollow-core slabs use unbonded prestressed tendons or bonded prestressed reinforcement. Stressed tendons and unbonded prestressed tendons have the disadvantage of insufficient structural performance, while the construction of bonded prestressed tendons needs to arrange tunnels and pressure drop, the process is complex and produces a lot of pollutants

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