LOW DRAWBRIDGE Russian patent published in 2005 - IPC

FIELD: bridge-building, particularly for drawbridges building.

SUBSTANCE: drawbridge includes drawn navigation span and non-drawn innavigation span, opening and closing mechanisms, permanent piers and bridge railing. Spans include span structures, wherein span structure in navigation span is of double-wing type. Bridge is low and comprises ice-passing structure. Drawn span is provided with grating with upper part located in water level or under water level. Formed in grating are socket-like depressions. Wings of double-wing structure are composed of beam set beams in which have equal heights, preferably of metal beams, wherein wing ends pivotally rest upon permanent piers. Posts of additional movable piers are pivotally connected to another wing ends. Movable piers are adjustably installed in grating depressions so that piers may be fixed in depressions and wings may operate in launched position as beams on two supports. Wings are connected one to another by flexible ties to prevent wind-caused bridge swinging. Ties may be formed, for instance, of ropes with ends arranged in anchoring depressions. In drawn position rope ands are inserted in longitudinal grooves located under bridge roadway.

EFFECT: extended range of low bridges usage, widened navigation underpass, for instance possibility to increase thereof by 6 - 10 m due to console enlargement along with provision of constant beam height.

2 cl, 4 dwg, 1 ex