ARRANGEMENT OF SUPPORTING PART Russian patent published in 2001 - IPC

FIELD: construction engineering; erection of long structures. SUBSTANCE: arrangement of supporting parts for expanded structures such as bridges, crane trestles, pedestrian subways, transport passageways, etc. has spherical segment taking vertical thrusts applied from structure to support, top and bottom bearing slabs engageable for ensuring rotary and horizontal displacements with desired friction coefficient relative to support by means of arresting devices; mentioned slabs are contacting each other in pairs through mating spherical and flat surfaces of slip layers; one of slip layers in each pair is of metal, other one is of polytetrafluoroethylene and has sockets filled with plastic lubricant. Novelty is that spherical segment and bearing slabs are arranged so that slip layers with mating spherical surfaces are higher than those with mating flat surfaces, one of slip layers in contacting pair, in particular polytetrafluoroethylene layer, is made of nonferrous metal components evaporated to desired thickness dictated by service conditions, for example it must be no less than degree of bearing stress due to load and wear of this layer within specified service life of structure. Position of top bearing slab and spherical segment relative to bottom bearing slab and structure may be varied: spherical segment may be positioned between top and bottom slabs fixed in position, say, by means of threaded joints to structure and to support, respectively, or vice versa. Moreover, at least one of slip layers of contacting pairs has voids open ones being filled with lubricant. In addition horizontal reciprocating motion limiters are mounted on bottom bearing slab; limiters and bottom bearing slab form leak-tight pan having at least one drain duct with plug; duct is deep enough to ensure its filling with liquid lubricant to desired level, for example that covering mating spherical surfaced of slip layers of spherical segment and of top bearing slab. At the same time supporting part has protective casing with filler neck to admit liquid lubricant to pan, as well as material purity and level indicator. EFFECT: reduced material input both for structure and support; extended service life. 7 cl, 6 dwg