Hinged Hollow Slab Girder Bridge and Its Transverse Unbonded Post-tensioning Prestressed Construction Technology

Abstract

The invention relates to a hinge joint hollow slab beam bridge and a transverse unbonded post-tensioning prestress construction technology thereof. The hinge joint hollow slab beam bridge comprises a plurality of hollow slabs which are spliced together, a plurality of through holes are evenly distributed in the lower portion of the side wall of each hollow slab in the length direction of the corresponding hollow slab, and stranded steel wires are arranged in the through holes. The hinge joint of every two adjacent hollow slabs is filled with concrete. A plurality of transverse reinforcements and a plurality of longitudinal reinforcements are evenly laid on the upper surfaces of the hollow slabs, and the upper surfaces of the hollow slabs are further covered with a concrete layer. On one hand, reinforcement treatment is conducted on the bridge deck pavement, tensile strength of the pavement is reinforced, the synergistic effect on beam bodies is enhanced, and the integral rigidity is enhanced; on the other hand, because the transverse unbonded post-tensioning prestress construction technology is adopted for the hinge joint hollow slab beam bridge, the transverse linkage between beams of the hollow slab beam bridge is reinforced, meanwhile, the strength of the concrete of the hinge joints is enhanced under the action of prestress, cracks of the hinge joints can be effectively prevented, and the single-slab stress phenomenon which is unfavourable to the structure is prevented.

Description

technical field [0001] The invention relates to a hinged hollow slab girder bridge and a transverse unbonded post-tensioning prestressed construction technology thereof, which belongs to the field of bridges. Background technique [0002] Among the current types of reinforced concrete beam (slab) bridges in China, prefabricated hollow slab girder bridges are more commonly used, because this type of bridge has a simple structure, low building height, economical materials, convenient prefabrication, and easy standardized production and construction. With the advantages of easy transportation and hoisting, it has become the preferred bridge type for domestic highway bridges with spans below 20m. However, the deck pavement thickness of this type of bridge is relatively small, generally 8cm, and the spacing between the steel bars in the transverse bridge direction is relatively large, generally 15cm. Insufficient pavement thickness of the bridge deck, small steel bar diameter, a...

AI Technical Summary

Problems solved by technology

Due to the existence of these reasons, the hinge joints are destroyed, which brings great disaster to the bridge.

Firstly, the veneer is stressed, the hinge joint concrete falls off, and the horizontal connection between the beams is destroyed, and the single hollow plate bears the wheel load; secondly, seepage and water damage, due to the hinge joint damage, rainwater enters, causing the bridge to suffer erosion, Alkalization, frost heaving and other problems, finally, the damage of hinge joints will also indirectly cause damage to bridge deck pavement, abutment piers and supports

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