Non-upper parallel connection steel truss girder composite beam and construction method

Abstract

The invention relates to a construction method of a non-upper parallel connection steel truss girder composite beam, which comprises the following steps of manufacturing a bridge deck slab section, and reserving a prestressed pipeline and a shear nail grouting groove in the bridge deck slab section, conveying the bridge deck slab sections to the steel truss girders to be positioned, and enabling the shear nail grouting grooves and the tops of the steel truss girders to be opposite to form grouting spaces, after the bridge deck slab sections are spliced into an integral structure, arranging prestressed steel beams in the prestressed pipelines, grouting the prestressed pipe after the prestressed steel beam is tensioned, so that the prestressed steel beam keeps the designed tension strength, and grouting the shear key grouting groove under the condition that the designed tension strength of the prestressed steel beam is kept. The construction method does not carry out upper parallel connection construction. By adopting a mode of firstly tensioning and then combining, the prestress in the concrete bridge deck slab can be always maintained at a relatively high level, the concrete bridge deck slab is effectively prevented from cracking, and meanwhile, the steel truss girder is of a structure without upper parallel connection, so that the construction cost is favorably saved, and meanwhile, the clear passing height of a lower layer can also be increased.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a combined beam and a construction method of an upperless parallel steel truss girder. Background technique [0002] At present, the bridge construction in our country is developing rapidly, and the bridge structures with long span, heavy load and multi-function are increasing day by day, and the double-layer bridge deck has broad development space. The upper deck of the double deck has two types of steel deck and concrete deck. The upper deck adopts the concrete deck, and the concrete deck acts as the upper flange of the steel truss girder to participate in the stress, which can give full play to the compressive performance of the concrete and reduce the amount of steel materials. At the same time, compared with the steel bridge deck, the deck pavement of the concrete bridge deck has better durability, the pavement structure is simpler, and the pavement cost is lower. Theref...

AI Technical Summary

Problems solved by technology

After research, it is found that the prestressed bridge deck structure in the related technologies has the defect of no prestressing in the cast-in-place or wet joint area, which cannot achieve full-section compression, and it is difficult to eliminate the risk of bridge deck cracking during the operation stage

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