1. PRODUCT OVERVIEW
VHC spherical Bearings manufactured by Vinh Hung Investment and Production Company Limited (Vinh Hung IP) are capable of with standing the high loads and movements suitable for structures requiring the rotary angle equal or bigger than 0.015 rad in all directions. VHC spherical bearings are designed and manufactured according to current standards such as: TCVN 11823, AASHTO LRFD, ASTM D5977, EN 1337, …
2. PRODUCT CHARACTERISTICS
VHC spherical bearing has a bottom plate (6) on which is a UHMWPE curved surfaced sliding plate (4). A convex calotte (5) is placed on top of this UHMWPE surface and with hard chrome-plated bottom surface, it can easily slide with low friction, thus facilitating rotations about every axis. A second sliding plate of UHMWPE (4) is recessed into the upper surface of the calotte.
Together with the upper plate (2) above it, this accommodates to longitudinal and/or transversally sliding movements of the superstructure, if required. To reduce sliding friction to a minimum, the lower surface of the top plate has a polished stainless steel sheet. In the case of guided bearing, the direction of movement is controlled by guiding bars (3).
The bearing is connected to the superstructure and the substructure by means of anchor dowels (1) (depending on design), or alternatively by means of separate anchor plates with shear studs.
Depending on each type of spherical bearing (fixed, guided or free sliding type), the upper parts are designed accordingly to meet the movement requirements of the bearing.
Spherical bearing transmits tension through vortex calotte surface and evenly distribute the load, including the corresponding force inside concrete structure.
To ensure the long-life durability, VHC spherical bearings are protected against corrosion by methods such as: coating with two-component epoxy, PU-based painting (Polyurethane), hot dip galvanization according to ASTM A123 standards and especially the Al – Mg spray coating method (at the ratio of 5% Al and 95% Mg) which ensure anti-corrosion durability of up to 100 years, proven by the salt-spraying test in 6000 hours (8-hour dry-wet cycle repetition) according to ASTM B117.
3. PRODUCT INFORMATION