Structure for rapidly restoring hinge joint of hollow slab bridge and construction method thereof

Abstract

The invention discloses a structure for rapidly restoring a hinge joint of a hollow slab bridge and a construction method thereof, which belong to the field of bridge engineering. The structure for rapidly restoring the hinge joint of the hollow slab bridge comprises a hinge joint crossing U-shaped bar, a sealing section, a coarse aggregate and a curing body, wherein the hinge joint crossing U-shaped bar is embedded upwards from the bottom surface of a hollow slab; the sealing section is arranged at the lower part of the hinge joint; the coarse aggregate is arranged on the sealing section; the curing body is formed by a high-expansion grout pressed to a coarse aggregate area and is used for enclosing the coarse aggregate; and a combined body of the coarse aggregate and the curing body is named as grouted aggregate concrete. According to the structure for rapidly restoring the hinge joint of the hollow slab bridge, the U-shaped reinforcing steel bar is used for resisting flexural-tensile stress in a transverse direction of the bridge and the grouted aggregate concrete is used for resisting the shear force between the slabs. An internal stress is generated in the grouted aggregate concrete through a high polymer formed by the high-expansion grout so that the shrinkage of the traditional hinge joint concrete is avoided; and through the internal stress, a positive pressure between a new concrete interface and an old concrete interface is increased, the bonding force between the interfaces is increased and the anti-shear capacity of the hinge joint is enhanced. The construction method for the structure for rapidly restoring the hinge joint of the hollow slab bridge, disclosed by the invention, is advantaged in that the construction speed is high; the hollow slab bridge can be rapidly opened for traffic; the curing effect of the structure is good; and standardized operation can be realized.

Description

technical field [0001] The invention relates to a structure and a construction method for rapidly repairing hinge joints of hollow slab bridges, belonging to the field of bridge engineering. Background technique [0002] The prefabricated hollow slab bridge is one of the preferred bridge types for small and medium-span bridges because of its simple structure, clear force, and convenient construction. At present, this bridge type has become the most used bridge type on expressways and trunk roads, and it is also the bridge type with the longest mileage. [0003] Although this type of bridge has excellent service performance, it is easy to Longitudinal cracks appear along the hinge joints, which has been confirmed by bridge disease investigations all over the country. The infiltration of rainwater will aggravate the impact of cracks on the integrity and stiffness of the beam body. Under the repeated action of overloaded vehicles, the hinge joints are prone to failure, and t...

AI Technical Summary

Problems solved by technology

This requires a lot of work under the bridge, and in order to ensure the repair effect, the transverse prestress is generally stretched, which increases the difficulty of construction and affects the clearance height under the bridge

For the hinged joints that are severely damaged and the hinged concrete is broken in large quantities, it is necessary to remove the hinged concrete and re-cast new hinged concrete. Due to the need for post-maintenance, the conventional repair work will seriously affect the existing traffic.

Images