What are the advantages of spherical bearings for railway rail transit bridges
Railway Rail Transit Bridge spherical bearing is an important supporting device for railway bridge construction, which has the following advantages:
1. high bearing capacity: the spherical bearing adopts spherical contact with large contact area, which can uniformly transmit the load of the bridge superstructure, and can bear the weight of thousands or even tens of thousands of tons, meeting the
Railway Rail Transit Bridge spherical bearing is an important supporting device for railway bridge construction, which has the following advantages:
1. high bearing capacity: the spherical bearing adopts spherical contact with large contact area, which can uniformly transmit the load of the bridge superstructure, and can bear the weight of thousands or even tens of thousands of tons, meeting the requirements of railway track bridges for heavy load bearing.
2. good rotation performance: the spherical bearing uses the rotation between the ball and the spherical crown liner to realize the rotation function of the beam body, which is flexible and has a small rotation friction coefficient, generally below 0.03, and can adapt to the rotation deformation of the beam body caused by temperature changes, concrete shrinkage and creep and other factors of the bridge, so as to ensure the stability and safety of the bridge structure.
3. strong horizontal displacement capacity: it can provide a large horizontal displacement capacity for the bridge through the sliding of the spherical surface and the PTFE plate inside the support, and can adapt to the horizontal displacement of the beam due to temperature changes, train braking force and other factors, and the displacement can generally reach tens of millimeters or even hundreds of millimeters.
4. good seismic performance: the spherical bearing has good shock absorption performance. When an earthquake occurs, it can absorb and dissipate seismic energy through the rotation and sliding of the ball, reduce the effect of seismic force on the bridge structure, improve the seismic capacity of the bridge, and protect the safety of the bridge structure and the train on the bridge.
5. good durability: the main components of the bearing are made of high-quality steel and corrosion-resistant materials. The surface is treated with anti-corrosion treatment, which can effectively resist the impact of atmospheric corrosion, rain erosion and other natural environmental factors. The service life is long, generally up to more than 50 years, reducing the workload and cost of bridge maintenance and bearing replacement in the later stage.
6. wide adaptability: it can adapt to different types of railway bridges, such as simply supported beam bridges, continuous beam bridges, cable-stayed bridges, suspension bridges, etc., as well as different line conditions, such as straight lines, curves, large slopes and other railway lines.
7. convenient installation: the spherical bearing is relatively simple in structure, light in weight and convenient in installation process, which can effectively shorten the construction period of bridge construction and improve the construction efficiency. At the same time, in the process of bridge operation, the inspection and maintenance of bearings are also more convenient.
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