What are the applications of railway rail transit bridge spherical bearings in large cross-border br
Railway Rail Transit Bridge spherical bearings are widely used in long-span bridges, mainly in the following aspects:
1. meet the stress requirements of long-span bridges
Strong bearing capacity: long-span bridges bear huge loads, including the weight of the bridge itself, train loads, etc. The spherical bearing has high bearing capacity and can withstand the pressure of thousands or even
Railway Rail Transit Bridge spherical bearings are widely used in long-span bridges, mainly in the following aspects:
1. meet the stress requirements of long-span bridges
Strong bearing capacity: long-span bridges bear huge loads, including the weight of the bridge itself, train loads, etc. The spherical bearing has high bearing capacity and can withstand the pressure of thousands or even tens of thousands of tons to ensure the stability and safety of the bridge structure. For example, in some large-span railway bridges across rivers and seas, such as Hutong Yangtze River Bridge, spherical bearings provide reliable support for the bridge, ensuring that the bridge can withstand various loads in the long-term use process.
Uniform force transmission: the spherical bearing transmits force through spherical contact, which can uniformly transmit the load of the bridge superstructure to the substructure, avoiding the phenomenon of local stress concentration. In the long-span bridge, the characteristic of uniform force transmission is particularly important. It can effectively reduce the deformation and damage of the bridge structure and prolong the service life of the bridge.
2. adapt to the deformation requirements of long-span bridges
Horizontal displacement capacity: the large-span bridge will produce large horizontal displacement under the action of temperature changes, train braking and other factors. The spherical bearing can adapt to large horizontal displacement, which can generally reach tens of centimeters or even more. For example, on some high-speed railway long-span continuous beam bridges, the spherical bearing can move freely with the expansion of the beam body, ensuring the normal use of the bridge structure.
Rotation capacity: the long-span bridge will rotate under load. The spherical bearing has good rotation performance and can meet the rotation requirements of the bridge under different working conditions. The rotation angle can generally reach 0.02-0.05 radians, ensuring the coordinated deformation between the superstructure and substructure of the bridge.
3. improve the seismic performance of long-span bridges
Seismic design: the seismic performance of spherical bearings is usually considered in the design, and special structural forms and materials are used, such as setting elastic elements, increasing damping, etc., to improve the seismic capacity of bridges under earthquake action. In some large-span railway bridges in earthquake prone areas, the seismic design of spherical bearings can effectively protect the bridge structure and reduce the damage of earthquake to the bridge.
Energy dissipation: the spherical bearing can consume seismic energy through its own deformation and friction when an earthquake occurs, reducing the effect of seismic force on the bridge structure. For example, in some long-span cable-stayed bridges with spherical bearings, the bearings can dissipate energy through the sliding of the spherical surface and the deformation of the elastic elements during the earthquake to protect the key parts of the bridge from damage.
4. convenient for construction and maintenance of long-span bridges
Easy installation: the structure of the spherical bearing is relatively simple, and the installation process is relatively convenient. In the construction of long-span bridges, the spherical bearings can be correctly installed in the design position through correct measurement and positioning, which reduces the construction difficulty and time. For example, in the construction of some large railway bridges, the use of spherical bearings can improve the construction efficiency and shorten the construction period.
Low maintenance cost: the spherical bearing has good durability and is not easy to be corroded and damaged by the external environment. During the operation of the bridge, it is only necessary to regularly inspect and maintain the spherical bearing, such as checking the displacement and rotation of the bearing, adding lubricating oil, etc., to ensure the normal use of the bearing and reduce the maintenance cost of the bridge.
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