Method for enabling extra heavy-loaded vehicle to cross simply supported girder bridge

Abstract

The invention relates to a method for enabling an extra heavy-loaded vehicle to cross a simply supported girder bridge. The method for enabling the extra heavy-loaded vehicle to cross the simply supported girder bridge comprises the steps of a, interrupting the traffic before the extra heavy-loaded vehicle begins to cross the simply supported girder bridge, laying steel bearing beams on the simplysupported girder bridge, erecting bridge crossing steel boxes on the steel bearing beams and enabling the bridge crossing steel boxes to form two lines of paths for the extra heavy-loaded vehicle topass through; when the extra heavy-loaded vehicle is crossing the bridge, enabling the extra heavy-loaded vehicle to run along the bridge crossing steel boxes, wherein the weight of the extra heavy-loaded vehicle is transmitted to the simply supported girder bridge through the bridge crossing steel boxes and the steel bearing beams so that maximum bending moment generated by the extra heavy-loadedvehicle on the simply supported girder bridge is reduced; and c, after the extra heavy-loaded vehicle crosses the bridge, dismantling the bridge crossing steel boxes and the steel bearing beams and enabling the simply supported girder bridge to recover normal traffic. According to the method for enabling the extra heavy-loaded vehicle to cross the simply supported girder bridge, the maximum bending moment generated by the extra heavy-loaded vehicle in the simply supported girder bridge span can be reduced, the traffic blocking generated by the extra heavy-loaded vehicle during crossing the simply supported girder bridge can be minimized, the bridge crossing steel boxes and the steel bearing beams can be rapidly dismantled after the extra heavy-loaded vehicle crosses the simply supported girder bridge and the bridge crossing steel boxes and the steel bearing beams can also be repeatedly used. The invention relates to the technical field of bridge engineering.

Description

Technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a method for overweight vehicles to cross a simply supported beam bridge. Background technique [0002] With the development of economy and the increasing frequency of industrial exchanges, some overweight vehicles have a demand for passing simply supported beam bridges. However, due to the excessive load of overweight vehicles, metropolises will exceed the ultimate flexural capacity of the main girder of the simply supported girder bridge. Therefore, it is necessary to strengthen the main girder of the simply supported girder bridge and increase temporary supports to improve its ultimate bending resistance. Only after the bearing capacity can overweight vehicles pass. [0003] In view of the above problems, the current reinforcement method that can be used for reference is disclosed in patent CN105297640B: a method for applying external prestress to the fabricated slab brid...

AI Technical Summary

Problems solved by technology

[0004] (1) It is difficult to effectively control the tensile force of the external cables: Excessively applied external cable tension will cause the main girder of the simply supported girder bridge to bend back, resulting in cracking at the upper edge of the main girder of the simply supported girder bridge; if the tensile force is small, the It is difficult to improve the ultimate bending capacity of the main girder of simply supported girder bridges

[0005] (2) The construction procedures are cumbersome, the construction period is long, and the traffic needs to be closed for a long time for construction; at the same time, there are problems such as complex external cable anchorage structure, difficult to effectively control the construction quality, and high construction technology requirements

[0006] (3) The overweight vehicle crossing the bridge is a temporary behavior, while the external cable reinforcement is a permanent structure, which loses its use value after the overweight vehicle crosses the bridge, resulting in great economic waste

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