Slide the ball bearing lifting precast T beam steel (with bearings), first in the top surface of the support pad stone laying a layer of 20 ~ 30mm mortar dry hard no shrinkage, corresponding anchor holes should be filled pound mortar, mortar layer top surface paved shape, slightly around the middle of mortar strength shall meet the requirements. T beam after falling beam in place, adjust the elevation and level of temporary supports, retaining both sides of the beam, the beam prevent roll; t two multi-plate T girder lifting line should be at the center and two T beam after hoisting timely solder connection bar between two pieces of T beams, and then gradually lifting the rest of the piece T beam from the center to both sides of symmetry; slide ball bearing steel welding defect prevention method: A method of preventing slag: machined groove shape and dimensions shall comply with the requirements of a two-way activity steel sliding bearing, assembly space, bevel land should not be too small, one-side welding, the back should be used planer electric wheel gouging or gouging, remove weld No seam root penetration and slag and other defects. B stomatal prevention method: Strict cleaning the surface of the groove and the surrounding paint, oxides and other impurities, welding rod drying temperature shall the provisions of its varieties require careful drying, wind and rain days without guarantee facility not construction welding. c crater prevention methods: the main arc weld plate and set to add extinguishing plates, weld joints and should be slow at the edge of extinction, and slowly opened the sliding bearing steel truss rod finished portfolio of crater Office shall be broken arc welding, must fill the crater, while mastering the corner of each weld does not allow a significant crater. Slide the ball bearing on the multilayer weld steel welds must be continuous welding, weld bead after each layer should be cleared up, find defects must be removed before welding. Beveling of the first layer and multi-layer welding flat welding position of non-small electrode diameter should be used. After each weld should seriously do cleanup work, check the weld defects, defective welds should be reworked. [Slide] ball bearing steel installation, with the bridge construction process varies. For situ beam should be bearing anchor bolt diagram in Figure 5 will be provided under the anchor bolts inserted into holes Xiazuo plate from the ground, put a nut, and then put on the seat pad stone, adjust seat position, From the next infusion epoxy mortar hole, then put on the anchor bolt and the anchor bolt and beam welded steel mesh on the bearing formwork, pouring beam; steel ball bearings [slide] For prefabricated beam steel sliding bearings should be first on the anchor bolt embedded in the beam, on the bridge at the time, the first holder fixed to the beam, and with good under anchor bolts, anchor bolts and other bolt holes and set aside for post- off the beam, and with epoxy mortar anchor bolt holes for perfusion. [Slide] ball bearing steel perfusion epoxy mortar, mortar on the pier set infusion process tanks, to be seated on the seat and adjust the level with an epoxy mortar (by weight epoxy resin 6101 100 Flexible steel sliding bearing stiffness, two small fat 17, ethylenediamine 8, sand 250) or high-grade cement mortar anchor bolt holes for perfusion and seat bottom cushion to be removed after hardening mortar used to adjust the level pads, and fill the position with epoxy mortar pads. Epoxy mortar requires infusion dense, may be left empty.