Construction method for reinforced concrete arched roof of grain store

Abstract

The invention discloses a construction method for a reinforced concrete arched roof of a grain store. The method comprises the following steps of: erecting a scaffold at the middle longitudinal part of a ring beam, and making a pedestal; paving lower chord prestressed steel bars, and performing prestressed tensioning; erecting a lower chord bottom die and a side die, installing a partition plate,and installing an upper chord arched bottom die and an upper chord arched side die at the top of the partition plate; paving upper chord steel bars; pouring concrete; stretching the prestressed steelbars when the strength of the concrete reaches over 85 percent, welding diagonal braces, and obtaining an arched plate after the diagonal braces are welded; and translating the arched plate, and welding and fixing the arched plate with an embedded steel plate. Because the construction mode of overhead prefabrication and integral translation is adopted, a large machine for hoisting is avoided, theconstruction progress is quickened, the safety risk is reduced, the cost is saved, the temporary site is reduced, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to a reinforced concrete construction method, in particular to a construction method for a reinforced concrete arched roof of a granary. Background technique [0002] The existing granaries for storing grain and oil mainly adopt multiple scattered flat warehouses built in a centralized manner, and each loose flat warehouse is a brick-concrete structure, the roof truss system is a reinforced concrete arched roof, and the upper chord is a quadratic parabolic equation. The prestressed reinforced concrete arch slab is a multi-functional roof truss system integrating load bearing, waterproof, heat insulation, etc. The upper and lower chords are connected as a whole with partitions, and there are 4 embedded parts under each arch plate, which are welded together with the ring beam. The concrete strength grade of the arch slab and partition is C35, the lower chord prestressed reinforcement adopts CRB800 grade, and the upper chord and par...

AI Technical Summary

Problems solved by technology

[0004] The hoisting construction method after ground prefabrication mainly has the following shortcomings: (1) The ground prefabrication needs to wait for the concrete strength to reach 100% before hoisting, and the hoisting and prefabrication need time intervals, and the construction period is long; (2) Large machinery is required for hoisting Hoisting, because the thickness of the upper and lower chords is thin, the hoisting is easy to damage the upper and lower chords, resulting in quality problems, which is not conducive to quality control, and the initial capital investment is large, and the cost of machinery use is relatively high

[0005] The overall pouring construction method mainly has the following disadvantages: (1) The arch slab construction has a large amount of engineering, great difficulty, and high requirements; (2) Scaffolding, springboards, and formwork need to be erected under the entire concrete pouring area

Therefore, the entire construction not only takes up a lot of space, but also requires a large amount of material and labor input, and the construction cost is high; it is also prone to idle work, and the construction efficiency is low

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