A kind of cable-stayed bridge structure and construction method for strengthening psc continuous box girder bridge

Abstract

The invention refers to a cable-stayed bridge structure used for reinforcing a PSC (Pre-stressed Concrete) continuous box girder bridge and a construction method. The structure comprises a bridge tower, an inhaul cable and built-up steel placed on a center line of a bridge deck, wherein the stress state of the PSC continuous beam bridge is changed through a cable-stayed bridge system, so as to improve the carrying capacity. The built-up steel is anchored on a top plate of the box girder through the connecting device. A bridge tower is welded on the built-up steel, and the bridge tower and the built-up steel are connected by the inhaul cable. In the traditional cable-stayed bridge, the girder in the mid-span no cable area is under a great axial tension, while the girder at the root of the bridge tower is under a great axial tension. According to the cable-stayed bridge structure used for reinforcing the PSC continuous box girder bridge and the construction method, disclosed by the invention, the built-up steel is anchored on the girder and the built-up steel is connected by the inhaul cable, excessive axial tension and stress act on the built-up steel without adverse effect to the girder, while the built-up steel provides upwards lifting power to the girder under the acting force of the inhaul cable, so that the bending resistance and shear-bearing capacity of the girder are enhanced, the sagging deformation of the girder is reduced and the development of the cracks in the girder can be restrained. The cable-stayed bridge structure is efficient, simple, safe and economic.

Description

technical field [0001] The present invention relates to a cable-stayed bridge structure and construction method (PSC: prestressed reinforced concrete) for strengthening a PSC continuous box girder bridge, the reinforced structure of the invention includes bridge towers, stay cables and a bridge placed on the centerline of the bridge deck Combined section steel, through the cable-stayed bridge system, changes the stress condition of the PSC continuous girder bridge, thereby improving its bearing capacity. The section steel is anchored to the top plate of the box girder through the connecting device. The bridge tower is welded on the composite section steel, and the bridge tower and the composite section steel are connected by cables. In traditional cable-stayed bridges, the main girder in the mid-span mid-span cable-free area is subject to a large axial tension; while the main girder at the root of the pylon is subject to a large axial tension. Excessive tension and pressure ...

AI Technical Summary

Problems solved by technology

[0012] With the development of social economy, the traffic volume of my country's roads has increased rapidly; at the same time, the relatively low design load standard value in the previous codes has led to a relatively insufficient carrying capacity of a large number of bridges, and there are potential safety hazards that cannot be ignored

In view of the fact that the current conventional bridge reinforcement methods still have some deficiencies in improving the bearing capacity of long-span prestressed concrete continuous box girder bridges, this invention takes the existing long-span prestressed concrete box girder bridges as the research object, collects and analyzes the bearing capacity of the existing long-span prestressed concrete box girder bridges. In view of the bridge diseases and design defects with insufficient strength, a cable-stayed bridge structure and construction method for strengthening PSC continuous box girder bridges are designed, which makes it more efficient, simple, safe and economical to improve the bearing capacity of PSC continuous box girder bridges

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