Method for reinforcing hollow plate girder bridge by adopting corrugated steel plates and UHPC

Abstract

The invention relates to the technical field of bridge reinforcement, in particular to a method for reinforcing a hollow plate girder bridge by adopting corrugated steel plates and UHPC, which is characterized by comprising the following steps: treating the concrete surface of an original hollow plate girder bridge bottom plate (1), removing an original steel bar protective layer, and exposing steel bars (5) of an original structure; a corrugated steel plate (3) is prepared, welding studs (4) are arranged on the corrugated steel plate (3), the welding studs and reinforcing steel bars (5) of anoriginal structure are welded together, and then UHPC (2) is poured, so that the corrugated steel plate (3) and a hollow plate girder bridge bottom plate (1) are formed into a whole. The advantages of the corrugated steel plates (3) and the UHPC (2) are fully utilized and combined to be well used for reinforcing the hollow plate girder bridge, so that the hollow plate girder can better work cooperatively, the transverse integrity of the hollow plate girder bridge is enhanced, the service life of the hollow plate girder bridge is prolonged, the bearing capacity of the existing hollow plate girder bridge is enhanced, and the hollow plate girder bridge has wide application prospects.

Description

technical field [0001] The invention relates to a method for strengthening a hollow slab girder bridge by adopting corrugated steel plates and UHPC, and belongs to the technical field of bridge strengthening. Background technique [0002] Over the past 40 years of reform and opening up, with the rapid development of the economy, a large number of hollow slab girder bridges have been built in my country. Hollow slab girder bridges are simple in shape, convenient in construction, economical in materials, clear in structural stress, and fast in construction. They are one of the most common types of small- and medium-span concrete bridges. [0003] The prefabricated hollow slabs of hollow slab girder bridges are generally manufactured with a width of 1m, and the transverse connection structure is adopted between the slabs to form an overall joint force. The commonly used horizontal connection method is groove-and-groove concrete hinge joints. In the early design, a large number...

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Problems solved by technology

The commonly used horizontal connection method is groove-and-groove concrete hinge joints. In the early design, a large number of small hinge joints were used for the hinge joints, and the horizontal connection was weak; Or poor vibration during pouring of hinge joints, resulting in reduced strength of the connection structure; meanwhile, the load level continues to increase, especially the large increase in overloaded vehicles

All of the above unfavorable factors will cause the hinged seam to be damaged in the later use process.

As an important horizontal connection structure of the hollow slab girder bridge, the hinged joint bears the joint force of the main girders. Once the hinged joint is damaged, the load cannot be effectively transmitted to the main girders, and the phenomenon of single-slab stress will be formed. The bearing capacity and service life of the hollow slab girder bridge are greatly reduced

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