UNIT JUNCTION BETWEEN TOP AND BOTTOM CHORDS OF THREE-DIMENSIONAL PRE-STRESSED TRUSS UNIT

摘要

FIELD: building, particularly for roofing of heated industrial and agricultural buildings and structures.;SUBSTANCE: unit junction includes cross-piece with stiffening ribs on which flexible arches of top chord and bottom tightening chord formed as thin strip are secured by means of fixers. Unit junction is provided with movably means for pre-stressing force retaining made as springs connected with bottom chord. Welded in lower chord ends are metal rods extending through orifices formed in cross-piece and supported by springs with the use of support washers and nuts. Springs are located from outer cross-piece side. Fixers for flexible arches securement are welded to stiffening ribs of cross-piece. Fixers and flexible arches installed in them are arranged in slots made in lower tightening chord.;EFFECT: possibility to make the best use of structure strength characteristics due to pre-stressing thereof and creating pre-stressed forces following for creep deformations to reduce losses of pre-stress.;5 dwg