METHOD FOR DISASSEMBLING METAL BRIDGE SPANS Russian patent published in 2001 - IPC

FIELD: bridge engineering. SUBSTANCE: method is used in major repairs of bridge on existing highways and those under construction in particular when there is functioning bridge nearby. Method involves preerection procedures for span removal and span dismounting. Novelty is that cutting charges are pre-installed in cross-section of each beam which is in section of one of two transversal planes symmetrically distant from central vertical axis of span; detonator is mounted by means of at least three times doubled detonating cords; ramps are arranged under lateral parts to allow the latter for moving over them under the action of mechanical pulses; takeoff is effected by in-phase cutting of span beams through their cross sections in given planes using explosion shears method. EFFECT: reduced cost and time of assembly procedure; improved safety of functioning highways and those under construction. 2 dwg