When the railroad bridge span between 20 ~ 32m, generally rocking shaft with steel supports. Rocking shaft support bearing and fixed bearing activities of the points. Movable bearing from the floor, Hem (rocker shaft) directly connected with the beam bottom and swing components. Top and bottom surfaces are formed circular hem curved, freely rotatable, by rotation of the lower plate after the top, the bottom surface of the displacement difference, to accommodate the needs of the beam displacement. Conventional rocking shaft bearing for the lower plate top, a bottom surface radius of curvature is inconsistent, thereby constraining rotation of the resistance is large, the current design of the rocking shaft a top, a bottom surface concentric to the part, so that carriage is free to rotate. Rocking shaft bearing from the fixed support, the composition of the hem, the bottom surface is flat hem, directly connected with the pier, bearing intelligent rotation, not displacement. Bearing Replacement Construction Notes (1) for the different forms of the bridge should be different jacking way. For the T-section beam or joist composed generally placed directly under the beam plate jacking up approach; but off the top of the core plate, box girder, then you must pay attention to lifting parts, to avoid Direct jacking beam bottom, easily selected in the costal and box girder web site, to prevent damage to the beam. (2) due to their weight and deck edge beam ancillary facilities (such as guardrails, linked at the connection points), and with the large differences in the beam on the top lift, be sure to double pressure and stroke control when lifting and to travel to the final control. Avoid causing uneven from the top deck of the shear failure. (3) strict control of lifting height of the beam, to avoid damage to the roof through the high rise bridge and ancillary facilities. The yield stress of steel ball bearings seismic characteristics of the temperature dependence of the level of lead in the grid affected by temperature damping steel ball bearing factory price to 15 ℃ prevail grid damping steel ball bearing pullout, early 0 ℃ increase 15%. 30 ℃ is down 12%. For two-way grid damping stiffness after yielding steel ball bearings, temperature effects of lead is small, almost the same characteristics of natural rubber. Vertical shear deformation and residual compressive relationship LRB relationship vertical stiffness and shear deformation, as bearing shear deformation increases, reduced vertical stiffness. Ultimate compressive strength steel ball bearing vertical seismic loads perpendicular compressive ultimate strength of the seismic load bearing steel ball under no final conclusion, a shape factor = 35, the second shape factor = 5:00, ultimate compressive strength of 49Mpa above, with respect to the use of the stress is greater safety factor. Seismic steel ball bearing gravity filling carefully checked after bearing a central location and elevation, with a gravity perfusion non-shrink grout cement mortar method, conducted in the following manner: filling and the top surface of the pad stone template should take credible measures to prevent the gravity plasma leakage occurs when grouting. In sealed bearings around the mold, the filling tube inserted into the seat next to the center position, from the bearing center to the surrounding grout, remove air bubbles and ensure all voids are filled with mortar. Non-shrink cement mortar layer on the lower surface of the bearing surface of the anchor plate is flush with or slightly below the surface. Preliminary calculations before grouting should grout slurry required amount, the actual number of perfusion slurry should not be calculated excessive errors, prevent missing middle pulp. Slip grid damping steel ball bearings _ _ dedicated a fine grid of steel ball bearing damping provided by Hengshui Rubber Co. Guangrun. Hengshui Guangrun Engineering Rubber Co. (www.grgcxj.cn) (www.grgcxj.cn) Hebei Hengshui, a leader in site construction materials, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum to meet customer needs. In Guangrun Rubber Company leadership with the staff warmly welcome all inquiries negotiations to create Guangrun Rubber Company a better future. You can also access (www.grgcxj.cn/supply_details_44690680.html), for more information about the company.