Method for reinforcing double arch bridge

Abstract

The invention discloses a method for reinforcing a double arch bridge, which belongs to the technical field of bridge reinforcement. The method comprises the following steps of: grinding and cleaning the inside of an arch tile and the surface of an adjacent arch rib, and spraying an epoxy interface agent; drilling a through hole from the arch back to the lower side of the arch tile; implanting a structural main reinforcing steel bar at an arch springing; implanting a constructional steel bar from the lower side of the arch tile to an arch plate; slightly jacking each control section of the arch rib and applying a pre-stress to the control section; binding the steel bars below the arch tile to form a steel bar framework; mounting a template below the steel bar framework between the arch ribs; casting micro-expansion concrete in a closed space formed among the arch rib, an arch support and the template below the arch tile from the through hole; unloading a jack after the micro-expansion concrete to be cast reaches the strength of a design requirement; and dismounting the template to finish the reinforcement of the double arch bridge. The method entirely solves the problem of poor composite structure of the double arch bridge, greatly improves the bearing capacity of the bridge and can be widely applied to the reinforcement and reconstruction of the existing double arch bridge.

Description

technical field [0001] The invention belongs to the technical field of bridge reinforcement. It is especially concerned with the reinforcement technology of double-curved arch bridges. Background technique [0002] After the appearance of the double-curved arch bridge, it has been popularized rapidly, and it occupies a large proportion in the old bridges in our country. [0003] The double-curved arch bridge is an arch bridge composed of four components: longitudinal arch ribs, transverse arch waves, transverse beams and cast-in-place arch slabs. Its disadvantages are weak integrity, loose stressed structure, thin arch ring section and low rigidity. , Poor horizontal linkage. It is easy to be damaged under overload and earthquake load. [0004] The traditional strengthening techniques of double-curvature arch bridges are generally classified into the method of enlarging the section (including bonding steel) and the method of reducing load. See "Bridge Inspection and Stre...

AI Technical Summary

Problems solved by technology

[0005] There are two main methods of increasing the cross-section, that is, the mold construction method increases the cross-sectional area of ​​the arch rib, and the hanging net anchor spraying method increases the thickness of the arch wave. These two traditional methods do not change the structural system of the original double-curved arch bridge, and the overall structure The problem of poor performance has not been effectively dealt with; the load reduction method is mainly to replace the high-density arch back filler with light-weight materials such as aerated concrete. traffic, also did not change the structural system of the original double-curved arch bridge