Passenger Dedicated Line Bridge usually prestressed concrete box girder truss elastic ball bearing steel finished manufacturers to adapt to the displacement and vertical and horizontal box-section beam to the rotating steel ball bearings need, at home and abroad are widely used seismic steel ball support. When the passenger dedicated railway track ballast-free, on line smoothness requirements are more stringent, except through the track pad and fasteners for CWR height adjustments necessary seismic grid-type ball bearing steel prices should consider studying simple, practical and economical to increase seat form, by appropriately adjusting the seat height that is to meet the requirements of passenger dedicated railway bridge using non-ballasted track. Increase the bearing has been used to increase the way at home and abroad over the height pedestals program are the following: increase the plate - in the cradle roof and floor of the additional increase in steel plate, raised elevation bearings ; spiral raised - with trapezoidal thread height adjuster damping ball bearing steel product prices, seat height adjustment; rubber injection pressure increase - using pressure injection of silicone rubber rubber sheet thickness thickening bearing pressure increase; now Several ways to increase, briefly explain: the way to increase the use of padded plate steel or steel Pulling increase is one of the easiest ways possible to increase the bearing program is currently the most commonly used home and abroad. Steel ball bearings [seismic] Design Corner: 0.02rad. [Seismic steel ball bearings can withstand the horizontal forces]: GD fixed bearing each direction, limit the direction of the DX-way bearing activities, bearing design for vertical bearing capacity of 10%. Multi-seat each to the activity (DX), the design level DX-way bearing activities force activity direction is 5% bearing vertical design bearing capacity. [Seismic steel ball bearing design displacement]: The main displacement of the design displacement SX and DX-way bi-bearing activities activities bearing structure along the direction of the lateral displacement of the ± 100mm and ± 150mm, SX-way bearing activities is ± 40mm, DX-way bearing activities lateral displacement limit of ± 3mm. When the desired amount of displacement is not the same, you can make special design; steel ball bearings [seismic] activity coefficient of friction bearing design: room temperature (-25 ℃ ~ 60 ℃) low temperature (-40 ℃ ~ -25 ℃) μ≤0.03 μ ≤0.05 temperature ranges: -40 ℃ ~ + 60 ℃ 7, bearing Environment: Supports according to the environment can be divided into common type (for general atmosphere) and corrosion resistant (suitable for the marine environment and severe atmospheric pollution atmosphere), corrosion resistant bearings require filling in the model LQZ (NS) in order to make identification. [Seismic] ball bearing steel sloping requirements for the beam, precast beam axle set way wedge plate bearing attendance topside to accommodate the requirements of the slope of the beam; slope cast girder bridge by the end of the concrete beam adjustment , bearing the body no slope.