Fabrication method of pretensioned prestressed steel box concrete beam

Abstract

The invention relates to a method for manufacturing a prestressed steel box concrete beam through a pre-tensioning method. The method includes the following steps that a box body is manufactured, an upper flange board, a lower flange board and two webs are welded into the box body, and two end sealing boards are welded; multiple prestressed steel strands penetrate into the box body, and two tensioning boards are arranged at the two ends of the box body; the prestressed steel strands are tensioned, and the two ends of each prestressed steel strand are fixed to the two tensioning boards; concrete is poured; the prestressed steel strands are released; and the prestressed steel strands are cut off, the tensioning boards are detached, and the steel box concrete beam is manufactured. By the adoption of the method for manufacturing the prestressed steel box concrete beam, the use amount of a concrete material is small, energy is saved, environment friendliness is achieved, and the bearing capacity, the rigidity, the plasticity and the anti-seismic property of the steel box concrete beam are improved; no concrete formwork is adopted, the construction difficulty is lowered, a construction period is short, and the construction quality is easier to guarantee; and the pre-tensioning method is adopted for tensioning the prestressed steel strands, it is guaranteed that the prestressed steel strands and the concrete are bound more reliably, a hole blockage problem and the problem about the grouting quality are solved, and the method is suitable for erection of an expressway bridge in a mountainous area.

Description

technical field [0001] The invention relates to the technical field of composite structure bridges, in particular to a method for manufacturing a pretensioned prestressed steel box concrete beam. Background technique [0002] Due to the narrow terrain and site restrictions, the construction of modern mountainous highways generally adopts beam bridge structures. However, the existing simply supported concrete beams, due to the large weight of the beam body structure and high labor intensity, require a large amount of sand and gravel materials, and are poor in environmental protection, and the manufacturing process of the concrete beams requires vertical formwork for pouring. The period of the bridge is long, requiring health maintenance, and prone to quality defects; because the bridge piers erected in mountainous areas are generally relatively high, the construction difficulty of beam erection is increased. At the same time, geological disasters in mountainous areas are seri...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for making pre-tensioned prestressed steel box concrete beams in view of the shortcomings of existing concrete beams in the prior art, such as heavy weight, long construction period, and relatively difficult construction

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