The main function of the supporting steel plate for the bearing is to ensure even load distribution on the bearing, preventing shear deformation caused by uneven loading, thereby avoiding premature damage to the rubber bearing. The rubber bearing supporting steel plate, "Highway Bridge Plate Rubber Bearing Specification Series," can also be customized according to customer drawings. The plate rubber bearing is a commonly used product in non-arch bridges on highways, and it is divided into ordinary plate rubber bearing and PTFE plate rubber bearing. The ordinary type bridge bearing is suitable for bridges with spans less than 30 meters and small displacement amounts. Different plane shapes are suitable for different bridge spans: rectangular bearings for orthogonal bridges; circular bearings for curved bridges, skew bridges, and cylindrical pier bridges.
Four-fluorinated ethylene plate-type rubber supports are suitable for bridges with large displacements, such as those with large spans, multi-span continuous structures, and simply supported continuous beams. They can also be used as sliders in the top thrust of continuous beams and the lateral movement of T-beams. The applications of rectangular and circular four-fluorinated plate-type rubber supports are similar to those of rectangular and circular ordinary plate-type rubber supports in terms of functional use. Plate-type rubber supports have isotropic horizontal shear, allowing for good transmission of deformation from the upper structure. Their advantages are particularly pronounced in the use of curved and inclined bridges. In addition to the functions of ordinary supports, this product can adjust the position of the force center through the spherical surface rubber layer when the force is applied at the end of the beam, gradually distributing the force to the steel plate and rubber layer of the circular plate-type rubber support, ensuring uniform bearing. It is particularly suitable for sites with oblique intersections, interchanges, and sloping bridges. Due to the unique characteristics of the plate-type rubber support itself, it has sufficient vertical stiffness to meet large vertical loads and good elasticity to adapt to the rotation of the beam end. It also has a large shear deformation to meet the horizontal displacement of the upper structure; and it provides excellent seismic resistance, reducing the impact of dynamic loads on the upper structure and piers.
During the construction of highway bridges, in addition to installing expansion joints and rubber bearings for highway bridges, as well as rubber water stops for expansion joints, measures are taken to ensure that the rubber bearings are uniformly loaded to prevent shearing deformation. Above and below the rubber bearings, there are matching steel plates. These matching steel plates are used for constructing railway bridges, highway bridges, and cross-sea bridges, etc. They are required to have high strength and toughness, as well as the ability to withstand the loads and impacts of locomotives and vehicles, with good fatigue resistance, certain low-temperature toughness, and resistance to atmospheric corrosion. The gaps between the bearings and the bedding stones must also be filled with epoxy resin mortar to ensure compactness and achieve the same strength as the bedding stones. After the bearings are installed, the steel plate embedded under the beam is connected to the top steel plate of the bearing using bolts.
