Spherical Bearings
Doshin Spherical bearings are designed for very high vertical, horizontal and lateral loads and where large rotational structural displacements need to be accommodated.
DOSHIN® SPHERICAL bearings are designed to transmit vertical forces in the bridge sub-structure and to facilitate rotations by means of a calotte and a concave lower part.
The flat sliding surface between the top of the calotte and a sliding plate accommodates longitudinal and transverse movements. Guide bars and a restraining ring are used to transmit horizontal forces.
Depending on whether the bearing is fixed, guided or free sliding, it accommodates vertical loads, horizontal forces, rotations and longitudinal or transverse movements.
Main reasons for the quality and durability of the bearings:
DSF (fixed)
The fixed bearing accommodates horizontal forces and rotations from any direction.
DSG (guided sliding)
The fixed bearing accommodates horizontal forces and rotations from any direction.
DSA (free sliding)
The free sliding bearing is movable and can be rotated in all directions and therefore cannot accommodate any horizontal forces.
DOSHIN® SPHERICAL bearings are designed to transmit vertical forces in the bridge sub-structure and to facilitate rotations by means of a calotte and a concave lower part.
The flat sliding surface between the top of the calotte and a sliding plate accommodates longitudinal and transverse movements. Guide bars and a restraining ring are used to transmit horizontal forces.
Depending on whether the bearing is fixed, guided or free sliding, it accommodates vertical loads, horizontal forces, rotations and longitudinal or transverse movements.
Main reasons for the quality and durability of the bearings:
Free rotation is facilitated by the concave bored lower element, which is lined with DR® SLIDE sliding disc. A convex calotte forms the other half of the sliding pairing. With its polished, hard chrome surface, friction between the calotte and the concave lower element is negligible.
In the case of guided or free sliding bearings, a DR® SLIDE sliding disc is provided on top of the calotte and, in conjunction with the upper sliding plate, this permits bridge movement in one or two axes. In order to keep the frictional resistance to a minimum, a shear-resistant polished austenitic stainless steel sheet is welded to the underside of the sliding plate
Assembly of the bearing
Principal components of the spherical bearings and materials used:
Sliding plate of a spherical bearing
All exposed steel components are corrosion-protected. DOSHIN adjusts the corrosion protection to suit exposure conditions or according to individual customer requirements.
Standard corrosion protection (type C4 in accordance with ISO12944) is as follows:
Thermal spray galvanising
DR® SLIDE bearings are suitable for all types of construction. In addition to excellent physical properties such as low wear and high compressive strength.
Resistance to aggressive chemicals and the effects of high-energy radiation are also excellent.
DR® SLIDE has excellent formability, making it easier to accommodate irregularities in the supporting structure and flatness deviations. Wear and local overstressing are less likely.
The high durability of the sliding material means that repair and maintenance costs are noticeably reduced.
Curved sliding surface of a spherical bearing
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