Highway bridge bearing bridge support role and requirements of bearings disposed between the superstructure and the piers of the bridge, its role is to: (1) transfer reaction force supporting the superstructure, including the vertical dead load and live load caused force and horizontal force; (2) ensure that the structure under live load factors, temperature changes, shrinkage and creep of concrete can be freely deformed so that the actual structure of the forces in line with the lower part of the structure still trying to type. Highway bridge bearing a bridge bearing classification. The possibility of displacement of its fixed bearing activities bearing fixed bearing vertical and horizontal forces to pass, in the cradle of the upper structure allows free rotation but not horizontal movement; movable bearing only transmit vertical force, allowing at both the upper structure in the seat can rotate freely move horizontally. Bearing activities can be divided into more (can move freely only in one direction) to the active support (longitudinal and transverse are free to move) and a one-way bearing activities. Highway bridge bearing material divided by simple bearing steel bearing reinforced concrete bearing rubber bearing special support (eg damping bearings, tension bearings, etc.) arranged in principle highway bridge bearing bridge bearings (1) for There sloping bridge structure, easy to be fixed bearing is arranged in the standard height of the piers (2) for continuous beam bridge and deck successive simply supported beam bridge, for the entire longitudinal deformation beam dispersion at both ends of the beam, should be fixed bearing disposed near the bridge across the center; but if higher middle fulcrum force because of the foundation piers or other reasons, to withstand the horizontal forces is very unfavorable, according to the specific circumstances of the fixed bearing is arranged in the other pier aside stage (3) For the special wide beam bridge, there should be able to set the longitudinal and lateral movement of the movable carriage. For curved bridge bearing activities should consider the possibility of moving along the arc direction. For in the earthquake area bridge, its structure should be considered a bridge abutment shock facilities, usually by a number of piers should ensure that the level of power-sharing. Fixed bearing and movable bearing arrangement to facilitate the piers should pass longitudinal horizontal force of principle. (1) For the bridge structure, it is best to make the lower edge of the beam under the action level of compression force, which can offset part of the vertical load in the tensile stress generated by the beam edge. (2) For the piers should be possible to point to the direction of the horizontal force banks to make the top of the pier at the level of force is not a pull. (3) For the abutments, as far as possible so that the direction of the horizontal force pointing piers center, so that the top abutment pressure, and the pressure to balance the soil behind the desk part. Highway bridge bearing bridge bearing arrangement precautions bridge bearing arrangement, mainly determined by the width of the bridge and the bridge structure. Simply supported beam bridge located at one end fixed bearing and the other end located bearing activities. The bridge width is small railway bridge, bearing the lateral displacement is very small, usually just a one-way bearing activities (vertical bearing activities), T-shaped girder highway bridge deck due to a wider, and therefore should be considered bearing transverse the possibility of moving; that on a fixed pier set a fixed bearing, bearing adjacent to the lateral movable longitudinally fixed unidirectional bearing activities, and set up a vertical movable bearing on the activities of the pier (with corresponding fixed bearing), the rest are set to activities more support. Continuous beam bridge linking each have just one fixed bearing. Activities end of the beam to avoid excessive expansion joints; fixed bearing should be placed on the middle of each associated fulcrum. However, if the pier where the body is higher, should be considered to avoid or to take special measures to avoid the pier itself to withstand the horizontal force is too large.

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