Concrete service bridge for opening and closing gate of large-span prestressed flood retaining gate and construction method

Abstract

The invention discloses a concrete service bridge for opening and closing a gate of a large-span prestressed flood retaining gate, and relates to the technical field of water conservancy and hydropower engineering. The structure comprises pier columns, a prestress service bridge and a bridge crane, a bridge crane rail is pre-buried in the prestress service bridge, a pre-tensioning steel strand is arranged in the prestress service bridge, the prestress service bridge adopts a T-shaped section, and rib plates are arranged on the two sides of the prestress service bridge at intervals. According to the method, the high tensile property of the pre-tensioning steel strands in the tensile area is fully utilized, the deflection deformation of the service bridge can be reduced by about 6 mm according to the scheme comparison and selection calculation result, the reduction proportion is about 15%, and therefore the concrete cracking degree of the tensile area is reduced or avoided. The invention further relates to a construction method of the concrete service bridge for opening and closing the gate of the large-span prestressed flood retaining gate.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, more specifically, it is a concrete working bridge for the opening and closing gate of the large-span prestressed flood retaining gate, and the invention also relates to the concrete working bridge for the opening and closing gate of the large-span prestressed flood retaining gate Construction methods for working bridges. Background technique [0002] The sluice mainly relies on the gate to adjust the upstream and downstream water levels. The purpose of the sluice working bridge is to facilitate the driving of the hoist and the lifting of the gate. According to the material, it is divided into a steel girder working bridge and a concrete girder working bridge; For cast-in-situ concrete working bridges, steel working bridges are used for larger spans. However, steel working bridges are expensive to maintain in the later stage, and there are risks of metal fatig...

AI Technical Summary

Problems solved by technology

[0002] The sluice mainly relies on the gate to adjust the upstream and downstream water levels. The purpose of the sluice working bridge is to facilitate the driving of the hoist and the lifting of the gate. According to the material, it is divided into a steel girder working bridge and a concrete girder working bridge; For cast-in-place concrete working bridges, steel working bridges are used for larger spans. However, steel working bridges are expensive to maintain in the later period, and there are risks of metal fatigue and bolt loosening. It is necessary to arrange technicians to inspect or perform anti-corrosion maintenance frequently.

[0003] From the perspective of force, the section size of the concrete working bridge is related to the span and the moving load of the upper hoist. The larger the span, the greater the moving load of the upper bridge machine, and the larger the size of the concrete section. The weight of the poured working bridge is also greater, and the more reinforcements are added, resulting in poor stress conditions of the working bridge and large engineering investment

[0004] When the span and upper load of the cast-in-place concrete working bridge are large, cracks are prone to occur, indicating that the concrete in the tension area of ​​the working bridge has reached the design value of tensile strength, but the tensile reinforcement has not yet reached the design value of its own tensile strength , that is to say, the tensile performance of the steel bar itself is not fully utilized, and cracks have appeared in the concrete tension area, which is the stress defect of the cast-in-place concrete working bridge

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