Universal Rotating Spherical Steel Bridge Bearing

Anti-seismic spherical steel bearings

At present, although the steel bearings used on railway bridges in China have a relatively large tonnage, these bearings are overly large in size and unable to achieve universal rotation. The KZQZ anti-seismic spherical steel bearings developed by Hebei Luze New Material Technology Co., Ltd. have significantly reduced the amount of steel used and their volume. They have relatively low manufacturing costs and possess incomparable advantages such as universal rotation and universal load-bearing compared to other types of bearings. Moreover, with a special structure that resists tension and shear, they are capable of withstanding earthquakes with an intensity of up to 9 degrees.
The KZQZ anti-seismic spherical steel bearings have passed the new product appraisal organized by the Hebei Science and Technology Committee. They are the first of their kind in China and have reached the international advanced level. The successful development of the KZQZ anti-seismic spherical steel bearings has created extremely favorable conditions for reducing project costs, improving the overall quality of projects, and enhancing the capacity for earthquake prevention and disaster reduction. They have great value for popularization and application in the fields of large-span spatial structures and bridge engineering that are booming both at home and abroad nowadays.

Force is transmitted through the spherical surface,ensuring that the reaction forces are evenly distributed. It relies on the polytetrafluoroethylene plate as the sliding surface. When the structure rotates, the spherical core rotates accordingly to realize the rotation process of the bearing and release the torque generated by the superstructure. During an earthquake, it depends on the slippage of the sliding bearing to offset part of the relative displacement and rduce the seismic forces acting on the building as well as the inter-story deformation.
Anti-seismic spherical steel bearings are applicable to large-span spatial structures and large-span bridges. They are especially suitable for wide bridges, curved bridges, skew bridges, and particularly for the engineering structures in high-intensity seismic areas.

The anti-seismic spherical steel bearing is composed of an upper bearing plate, a stainless steel displacement plate, a polytetrafluoroethylene sliding plate, an intermediate spherical steel core plate, a polytetrafluoroethylene spherical plate, a rubber sealing ring, a lower bearing plate and upper and lower fixed connecting bolts.

Structural diagram of KZQZ anti-seismic spherical steel bearings.

1. The bearing adopts spherical contact, which features a large contact area, low pressure, uniform force transmission, small volume and a small amount of steel used.
2. It can bear loads in all directions, that is, it can withstand pressure, pulling force and shear force in any direction.
3. It can rotate in all directions to release the bending moment in any direction.
4. The bearing uses damping springs, which can meet the damping requirements of engineering structures in high-intensity seismic areas.
5. All the force-bearing components of the bearing are made of steel parts, and there will be no aging problems within 200 years.
6. PTFE products are used in the bearing. They have a very low friction coefficient, unaging, and can withstand low temperatures down to -150 °C, ensuring the universal flexibility of the bearing's rotation and its application in cold northern regions.
7. The reaction force of the bearing is concentrated, clear and does not change with the rotation angle.
8. Thanks to the function of the bearing, the lower structures (columns, piers) are subjected to uniform forces.
9. The bearing has high dynamic and static stiffness, ensuring the smooth running of vehicles. 10.The bearing has a low height, which is beneficial to the structural design of bridges.

1.The KZQZ anti-seismic spherical steel bearings can rotate in all directions and bear loads in all directions. They can well meet the requirements for the transmission, rotation and movement of the reaction forces generated by various loads of the superstructure (such as dead load, live load, wind, seismic force, etc.), ensuring that the resultant force of the reaction forces is concentrated, clear, safe and reliable.
2. The KZQZ anti-seismic spherical steel bearings can withstand tensile, compressive and shear (lateral) forces. Under the action of huge random seismic forces, as long as the upper and lower structures themselves are not damaged, disastrous consequences such as beam or frame falling will not occur as long as these bearings exist (Generally speaking, bearings are a weak link. Under the action of powerful seismic forces, beam or frame falling is very likely to happen. However, the strength and ductility of this type of bearing are higher than those of the structure itself). Therefore, it is especially suitable for fortification in high-intensity seismic areas and has the ability to withstand earthquakes with an intensity of 9 degrees.
3. Compared with other bearings (such as laminated rubber bearings, pot rubber bearings, etc.), the KZQZ anti-seismic spherical steel bearings have a large static stiffness. Under the action of the huge dead weight and inertial forces of trains and large vehicles, the bearings only produce minimal deformation and can reliably ensure the smooth running of cars and trains at high speeds.
4. The KZQZ anti-seismic spherical steel bearings transmit forces through the spherical surface, have a large force-bearing area, and adopt the optimal combination of several materials.
Therefore, compared with other hinged structure bearings (such as rocker bearings, roller bearings, etc.), their volume and height are greatly reduced, they are lightweight and easy to install, and compared with steel bearings with the same bearing capacity, they have a lower cost.
5. The KZQZ anti-seismic spherical steel bearings have a wide applicable temperature range (-40 °C to 70 °C) and good durability. Since they do not use rubber to bear pressure, there is no impact of rubber aging on the rotation performance of the bearings.
6. The KZQZ anti-seismic spherical steel bearings are especially suitable for projects such as wide bridges, curved bridges, cable-stayed bridges, ramp bridges and large-span spatial structures. They are more applicable especially in high-intensity seismic areas, while other types of bearings are difficult to meet the requirements.
7. The KZQZ anti-seismic spherical steel bearings have a tensile structure, which can reduce the counterweight blocks at the bridge ends.
 

Universal hinge bearings with large rotation angles and tensile resistance.

This kind of bearing is divided into four types: fixed, unidirectional, bidirectional and universal sliding. Specific designs can be made separately according to the structural requirements.

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