Reinforcing steel bars should be arranged in the supporting cushions

 Reinforcing steel bars should be arranged in the supporting cushions.1.1 When the plate rubber bearing is selected, the maximum bearing capacity of the bearing should be consistent with the reaction force of the bridge fulcrum, and the allowable deviation range should be 10%. The top elevation of the cushion stone of the support is required to be accurate. The plate rubber bearing should be checked according to the relevant regulations of JTG D62 and can be used only after the checking meets the specified requirements. 

The steel plate on the support is generally connected with the beam by bolts, and welding can also be used when necessary: ​​that is, the steel plate on the support and the embedded steel plate at the bottom of the beam are directly welded and fixed in sections.4 The PTFE sliding rubber bearing should be installed horizontally. 1. When the diameter of the steel bars is 8mm, the spacing should be 50mm. 2. Support selection 1. 

Installation preparation 2. In the case of a flat slope, the supporting cushion stones at both ends of the same beam and the supporting cushion stones on the same pier and platform should be in the same design elevation plane, and the relative height difference should not exceed 1. The PTFE slide plate of the support shall not be installed on the bottom surface of the support, and the stainless steel plate in contact with the PTFE slide shall not be installed on the bridge piers or cushion stones. Highway bridge engineering should not use rubber bearings with spherical crowns or slope-shaped rubber bearings. 

When the longitudinal slope is greater than 1%, pre-embedded steel plates, concrete pads or other measures should be used to level the bottom of the beam to ensure that the support is flat. And should consider facilitating the replacement of the support.5mm. 2. The height difference of the same supporting cushion should be Less than 0. During installation, the center line of the support position should be marked on the supporting cushion stone and the support in accordance with the requirements of the design drawings to ensure that the support is accurately in place. 3. 2.3 When the longitudinal slope of the bridge is not more than 1%, the plate rubber bearing can be directly installed on the pier, but the thickness required for the influence of the longitudinal slope should be considered. 

The size of the supporting cushion stone should be determined according to the local pressure calculation. The length and width of the cushion stone should be increased by about 50mm compared with the corresponding size of PTFE coated tape the support, and its height should be more than 100mm.2 For curved, sloping, oblique and wide bridges, circular plate rubber bearings should be used. The concrete strength level of the supporting cushions should not be Below C30. 

There should be vertical steel bars in the bridge piers and platforms extending into the supporting cushions.3 The surface of the support cushion should be flat, clean, dry and free of floating sand.. 1. 1.5mm. Support installation 3.1 After the support enters the site, check whether there is the manufacturer's trademark or permanent mark on the support.1 Supporting cushion stones should be installed at the installation place of the plate rubber bearing