BRIDGE SPAN STRUCTURE PROTRUSION DEVICE Russian patent published in 2007 - IPC E01D21/00 

FIELD: bridge construction, particularly longitudinal span structure protrusion.

SUBSTANCE: device comprises carriages, rolling path, sliding members and traction mechanism including traction winch having rope reeved in multiple traction block and tackle means through movable and fixed pulley system. The movable and fixed pulleys are secured in ferrules. Device comprises equalizing block and tackle means, cross-arm and braking winch secured to intermediate support and having rope reeved through angle roller fastened to span structure end. Span structure end has angle pulleys symmetric in height and width thereof. Equalizing block and tackle means rope passes over rollers secured to movable block ferrule and to cross-arm. Cross-arm supported by rolling path is provided with central angle block, leading up winch, channel with flexible traction insert made as a row of pivotally joined links. The first rope end is secured to intermediate bridge pier. Another one is connected to leading up winch drum. Electronic scales may be built in end part of traction winch rope.

EFFECT: decreased size and costs, possibility of device usage in densely built-up urban territories.

2 cl, 2 dwg