The maintenance aspect, the sliding surface, rolling surface is not flat, dirty, dust and other foreign matter not timely cleaning, fasteners loose reinforcement is not timely, because waterproof device defect makes the holder or link area water corrosion, accelerated aging processes. Again is due to the piers, abutments uneven subsidence, tilt and horizontal shift of the upper structure, vibration displacement and other superstructure steel truss bearing directly affect the normal use. Bearing steel grid can make safe and effective use of normal, it should strengthen the holder of regular inspection and repair and reinforcement work, and dedicated to the steel truss seat for the daily management and maintenance purposes, put into practice very difficult style unidirectional ball bearing seismic slip grid, it is usually combined with other conservation work with bridge steel truss seat and pay attention to the site and check its own integrity, observing the presence or absence of dislocation seismic steel truss ball bearing, void, bearing activities are flexible, whether fixed bearing universal rotation grid seismic shift ball bearings, the amount of displacement is normal, fixed connection is intact, supporting cushion crushed stone concrete or without rupture dust deposition and rubber bearings is aging cracking, deformation is uniform, steel truss bearing steel pots, ball bearings with or without the appearance of rust dust cover is intact and so change phenomenon. Earthquakes are the amount of physical phenomena Earth has a significant impact on human life and production, the role of the load on the bearings in the construction, after the completion of the construction and function of the load on the bridge there is a big difference one way ball bearing seismic activity grid In the study of the function of steel truss bearing supports, must be considered in the construction of external influences. The main two-affected areas of the earthquake zone in Central Europe, Asia Pacific and the world is an earthquake-prone countries, with devastating earthquakes since, steel truss bearing 5 earthquake occurred in China more than about 118 times, may be advanced, bearing steel grid structure in which a variety of functions within the limited space at this time, it must be noted on the structural changes due to deformation of the load center of movement, etc. and reduce the problems due to functional characteristics of the long-term change. When using the line contact bearing steel grid and point contact, due to a very large local endurance as bearing function, generally require bearing load and live load has a constant vertical force and other functions supporting the upper structure, but also to adapt temperature changes, concrete shrinkage and other produce rotational displacement displacement function level since the 20th century in which large destructive earthquakes in our country. More than 5 earthquake occurred in China received 118 times, including the 20th century to date with our devastating earthquake. Ball bearing unidirectional seismic activity grid seismic grid ball bearing _ _ factory price concessions provided by the Hengshui HaoTong Engineering Rubber Co., Ltd. Hengshui HaoTong Engineering Rubber Co., Ltd. (www.htgcxj.com) strong, credible, Hebei Hengshui site construction materials industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement through innovative ideas will lead Hao engineered rubber and you work into the brilliant, for a better future!