Replaceable component for improving fatigue property of steel box girder and construction method of replaceable component

Abstract

The invention discloses a replaceable component for improving the fatigue property of a steel box girder and a construction method of the replaceable component. The replaceable component comprises a longitudinal rib protecting section (3) fixedly connected with the lower surface of a steel box girder top plate (1.1). An upper groove fixing section (5.1) is connected to the lower surface of the longitudinal rib protecting section (3), and a lower groove fixing section (5.2) is fixedly connected to the upper surface of a steel box girder bottom plate (1.2). The upper groove fixing section (5.1)and the lower groove fixing section (5.2) are connected through a telescopic clamping component (4). During using, the local load borne by the steel box girder top plate (1.1) is transmitted to a steel box girder web, the steel box girder bottom plate (1.2) and the like through the replaceable component, thus fatigue cracks are prevented from generating or expanding, and the purpose of improving of the fatigue property is achieved; and under the effect of the vehicle load, after deformation or damage occurs to the telescopic clamping component (4), replacement can be quickly conducted, and practical application is facilitated accordingly.

Description

technical field [0001] The invention relates to a replaceable component for improving the fatigue performance of a steel box girder and a construction method thereof, belonging to the field of bridge engineering. Background technique [0002] Due to its strong spanning ability and superior mechanical properties, steel box girder bridges have been widely used in the field of long-span bridges at home and abroad. At present, the roof of steel box girder bridges generally adopts orthotropic steel bridge decks. This kind of bridge decks has the advantages of high material utilization, wide application range, large bearing capacity, and comfortable driving. The most prominent disadvantage is that it is prone to fatigue cracking. Fatigue cracking is mainly concentrated in the roof weld. Once cracking, not only the number of cracks is large, but also the fatigue damage is serious and harmful. [0003] The occurrence of fatigue cracks is related to the vehicle load, crowd load, win...

AI Technical Summary

Problems solved by technology

At present, maintenance technologies such as crack welding, local reinforcement, and impact crack closure repair have been formed. However, the existing steel box girder fatigue crack repair technology is not only time-consuming and labor-intensive, but also has high economic costs.

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