Steel grid bearing grid bearing】 【grid holder is based People's Republic of China Communications Industry Standard "ball bearings technical conditions (GB / T17955-2009) and seismic design of buildings (GB50011-2001) Steel Design Specification (GB50017-2003), through detailed statics, dynamics analysis developed from the new seismic damping steel bearing. Seismic damping bearing structure is more reasonable, more reliable performance and longer life. [Grid holder] (aka steel bearing) is divided into four types: GKQZ seismic steel ball bearing type, GJQZ type damping steel ball bearings, GKGZ steel structure seismic steel ball bearings, GJGZ steel structural damping steel ball bearings. [Grid] bearing the holder comprises a fixed bearing (code GD), a one-way bearing (code-named DX), two-way bearing (code SX) three types, 22 grade fixed ball joint grid bearing products, its level of capacity, the overall strength of the vertical uplift and bearing than ordinary seat has greatly improved. The series bearing elastic damping element, when the level of force to a certain extent, the elastic deformation of the damping spring began to realize cushion. When the structure corner, the ball core produce rotation, release the torque generated by the upper structure. [Grid] earthquake holder, rigid and flexible measures seismic damping measures at the same time play a role, in order to resist the huge earthquake input energy, so can guarantee the bridge, under reasonable structure relative displacement, reducing the amplification factor of seismic force, and keep the structure unity. The seat can withstand 8-11 degree earthquake on the highly seismic region, especially engineering structures epicentral earthquake zone have good shock damping effect. Ball bearings are developed on the basis of basin-type rubber bearing on a new bridge bearings. With the development of two-way one-way bridge technology slip grid bearing products, the emergence of a large number of bridges and wide curved bridge, in the early 1970s on the development of a foreign ball bearings, it is designed to be much larger than the corner basin rubber support seat, usually 0.01 ~ 0.01rad, if necessary, can be reached 0.05rad. Design reaction force from 1MN ~ 30MN. Since 1988, cooperation by the Ministry of Railways Institute of Science and the Ministry of Development Xinjin 筑路机械厂 bidirectional ball bearing slide ball bearing hinge grid, and passed on 6 2MN ball bearing system development, After the repair by the Shanghai Huangpu River Bridge cable-stayed bridge with a main bridge 10MN spherical bearing fixed bearing grid bearing, angular design of 0.042rad. 1991 but also in the West Wing roadworks Tiananmen Square in Beijing, temple and CaiHuYing and other widely used overpass ball bearings 3 ~ 12.5MN, the current ball bearings are widely used in the domestic cities and highway overpass bridges Suppliers use. Maximum tonnage on highway bridges ball bearings for 145MN (Chaotianmen Bridge), the railway bridges have been designed and ball bearings for the maximum tonnage of the finished 180MN (Yangtze river bridge). The main difference with the ball bearing rubber bearing basin is: pot rubber bearing steel pot by turning the rubber to meet the needs of the corner of the bridge, due to the rotation of rubber and rubber anti-torque diameter, thickness and hardness of, Therefore, when the holder is rotated, with the change of angle of the holder, the holder of the rotating counter moment changed accordingly, and bearing the rubber thickness is limited and is generally 1/10 to 1/15 the diameter of the rubber, and therefore basin rubber bearing design angle is generally 0.012 ~ 0.02rad.