Method for reinforcing the transverse overall performance of prefabricated hollow slab girder

Abstract

The invention discloses a method for reinforcing the transverse overall performance of a prefabricated hollow slab girder, which comprises the following steps of: firstly, chiseling away a bridge deck pavement, a common cast-in-place concrete layer and a bottom carbonized concrete layer of the existing hollow slab girder, and then drilling mounting holes of a vertical prestress system at a hinge joint on the existing hollow slab girder along the longitudinal direction at certain intervals; then steel bars of the upper-layer ultra-high-performance reinforced concrete cast-in-situ slabs and steel bars of the lower-layer ultra-high-performance reinforced concrete cast-in-situ slabs are bounded on the upper face and the lower face of the existing hollow slab girder respectively, and anchorage devices and steel bars at lower ends of vertical prestress systems are pre-buried; and upper and lower ultra-high-performance reinforced concrete cast-in-situ slabs are poured onto the upper face and the lower face of the existing hollow slab girder respectively; and then the vertical prestress systems are tensioned, the mounting holes are poured and filled, and finally pavement paving is recovered. The problem of hinge joint cracking is solved, the situation that a single plate is stressed is avoided, the overall stability of an existing hollow slab girder is enhanced, the beam section is increased, and the service life of a bridge is prolonged.

Description

technical field [0001] The invention belongs to the field of beam structure reinforcement, and in particular relates to a method for strengthening the transverse overall performance of a prefabricated hollow slab beam. Background technique [0002] Hollow slab girder is a common bridge superstructure. The slabs are prefabricated in the prefabrication plant and transported to the site for hoisting. They are connected to the substructure through supports. layer, and a pavement layer on the cast-in-place layer. Hollow slab girder bridges have many advantages such as simple prefabrication process, convenient installation, low cost and small building height, so hollow slab girder bridges are widely used in various highway projects. [0003] Due to the excessive pursuit of economic indicators in the construction of hollow slab girder bridges, the neglect of structural details and resistance reserves, and the current vehicle load level is getting higher and higher, so various dise...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for strengthening the overall performance of the prefabricated hollow slab girder in the transverse direction, which solves the problem of hinge joint cracking, avoids the stress on the single slab, strengthens the overall stability of the existing hollow slab girder, and increases the section, prolonging the service life of the bridge

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