A kind of steel plate girder bridge and its construction method

Abstract

The invention discloses a lower bearing type steel plate girder bridge and relates to the field of bridge reinforcement. The lower bearing type steel plate girder bridge comprises a bridge body, the bridge body comprises two main longitudinal beams and a cross beam located between the two main longitudinal beams, the main longitudinal beams comprise webs, upper flange plates which extend horizontally are arranged at the tops of the web plates, and the bottoms of the webs are provided with horizontally extending lower flange plates. The girder bridge is characterized in that a transverse connecting plate is arranged at the bottom of the cross beam, the two ends of the transverse connecting plate are fixedly connected with two reinforcing assemblies respectively, and the bridge body abuts between the two reinforcing assemblies. According to the lower bearing type steel plate girder bridge, transverse connection between the main longitudinal beams can be enhanced, the transverse rigidity of the steel plate girder bridge is improved, and the steel plate girder bridge is safer and more reliable.

Description

technical field [0001] The invention relates to the field of bridge reinforcement, in particular to an under-supported steel plate girder bridge and a construction method thereof. Background technique [0002] The use of down-through steel plate girder bridges has a long history. It has the characteristics of simple shape, low manufacturing and erection costs, and is widely used in railway construction. [0003] see figure 1 As shown, the under-supported steel plate girder bridge is composed of several girder bridge units, and each girder bridge unit includes two main longitudinal girders 1 arranged along the bridge direction and two beams 2 arranged across the bridge direction. There are also multiple longitudinal beams 3 perpendicular to the beam 2, and multiple longitudinal beam parallel joints 4 perpendicular to the longitudinal beams 3 are arranged between two adjacent longitudinal beams 3, and the lower part of the steel plate girder bridge is provided with two inters...

AI Technical Summary

Problems solved by technology

[0004] With the continuous development of transportation, the speed of the train needs to be continuously increased. When the speed of the train is increased, the vibration frequency of the vehicle changes. The existing under-supported steel plate girder bridge has a relatively weak lateral connection and insufficient lateral stiffness will cause a large lateral amplitude. , causing the train to derail, and there are potential safety hazards. On the other hand, the lateral stiffness of the existing under-supported steel plate girder bridge cannot meet the requirements, which also greatly restricts the speed of the train.

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