A kind of suspension bridge structure and construction method for strengthening psc continuous box girder bridge

Abstract

The invention relates to a suspension bridge structure used for reinforcing a PSC (Pre-stressed Concrete) continuous box girder bridge and a construction method. The reinforced structure comprises a bridge tower, a cable rope and built-up steel placed on a center line of a bridge deck; the stress state of the PSC continuous beam bridge is changed through a suspension bridge system, so as to improve the carrying capacity. The built-up steel is anchored on a top plate of the box girder through a connecting device and a vertical prestressed reinforcement. The bridge tower is welded on the built-up steel; the bridge tower and the built-up steel are connected with each other through the cable rope and a derrick. In the invention, the cable rope is anchored at the two ends of the girder to form a stress system together with the bridge tower, the derrick and the box girder, and jointly bear the girder dead load and the live load like automobiles, crowd, etc. According to the suspension bridge structure used for reinforcing the PSC continuous box girder bridge and the construction method, disclosed by the invention, the derrick provides upwards lifting power to the girder, 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 reinforcing method of the suspension bridge can improve the carrying capacity of the PSC continuous box girder bridge more efficiently, simply, safely and economically.

Description

technical field [0001] The present invention relates to a suspension bridge structure and construction method (PSC: Prestressed Reinforced Concrete) for strengthening PSC continuous box girder bridge. The stress condition of the PSC continuous girder bridge is changed through the suspension bridge system, so as to improve its bearing capacity. The section steel is anchored to the top plate of the box girder through the connection device and the vertical prestressed steel bar. The bridge tower is welded on the composite steel, and the bridge tower and the composite steel are connected by cables and suspenders. In the present invention, the cables are anchored at the two ends of the main girder, and the bridge tower, suspender, and box girder form a stress system, which jointly bears the dead load of the main girder and the live loads of automobiles and crowds. In the invention, the suspender provides an upward lifting force to the main beam, enhances the bending resistance an...

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 order to improve the bearing capacity of PSC continuous box girder bridges, it is more efficient, simple, safe and economical to improve the bearing capacity of PSC continuous box girder bridges.

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