Location and extent of damage to the bridge support will directly affect the repair method selected, so the first thing to grasp the reasons for bearing damage is extremely important. Different reasons damage repair methods are different, for example due to bearing damage and deformation constraint structure itself, should be repaired for its ability to ensure the displacement of the provisions of the bridge design. When the bridge support if the holder is due to the use of unreasonable forms, such as bridges longitudinal slope greater than specification, and direct use on sloping, crown-shaped ball bearings, beam bottom usually be adjusted for damage, replace the bearings must be carried out at the end of the beam leveling process designed to put a seat in the direction of, and can not simply be put on a stand of trouble, bearing damage caused by factors must be eliminated from the root. If the reason for the lower bridge bearing structural deformation caused, it must be taken into account to decide its future deformation repair methods, that is, repair method should have a clear focus, can not be stereotyped, otherwise reach the intended purpose and effect. Holder Features: ① seismic steel ball bearings can be universal rotation, universal bearing, upper structure can satisfy all kinds of loads generated by the reaction force of the transfer, rotate, move requirements to ensure reaction force concentrated, clear, safe and reliable. ② seismic steel ball bearings can withstand tensile, compressive, shear (lateral) force in the huge random seismic force, as long as the upper and lower structure itself does not destroy, falling beam, landing gear and other catastrophic consequences will not happen, so especially for fortification highly seismic area, the ability to be resistant to seismic intensity of 9 degrees. ③ seismic steel ball bearing static stiffness, and a large car in the train weight and inertia force huge force, bearing produces only minimal deformation, can reliably guarantee the car ride, the train running at high speed. ④ seismic steel ball bearing force transmission through the sphere, the force area, and using the optimized combination of a variety of materials, which have greatly reduced the volume and height, light weight, easy to install, and compared with the same carrying capacity of steel bearing low cost. ⑤ seismic steel ball bearings suitable for a wide range of temperature (-40 ℃ ~ + 70 ℃), good durability, without the use of rubber bearing, rubber aging affect the performance of bearing rotation does not exist. 3. Supports Scope: seismic steel ball bearings suitable for a wide bridge, curved bridge, bridge, bridge ramp, large span structures and other projects, especially in the area of ??high seismic intensity more applicable. 4. Supports technical performance: ① bearing friction coefficient is 0.03. ② support reaction force (vertical bearing capacity) 26 minutes (1000 ~ 60000KN): ③ 1000,1500,2000,2500,3000,4000,5000,6000,7000,8000,9000,10000,12500,15000,17500 , 20000,22500,25000,27500,30000,35000,40000,45000,50000,55000 and 60000KN. ④ bearing horizontal shear vertical bearing capacity of more than 20%: ⑤ bearing pullout tensile strength is 10% -30% of the vertical bearing capacity; ⑥ seat angle is 0.03rad; ⑦ bearing temperature range : -40 ℃ ~ + 70 ℃ 

keywords: Spherical bearings, spherical bearings earthquake, much to the shock of spherical bearings,