SPAN SPREADERS WITH DEVICES PROVIDING THEIR EXTENSION Russian patent published in 2019 - IPC E01D15/127 

FIELD: construction.

SUBSTANCE: span spreaders with devices providing their extension are intended to increase throughput capacity of the bridge. Each extending spreader of span is made in the form of frame-comb (1), consisting of longitudinal beam (4), combined with transverse beams (5, 6, 7), which by their ends are inserted into working holes (8), which are available in vertical walls of longitudinal stiffness ribs (9, 10) of power set elements of bridge road (2). To fix extensible roadway broadener in transport position on element of beam (6) on bracket (19) there is rocker lock (20), on front and rear end of which there is inclined-stop end (21) and ridge (22). Inclined-stop end (21), engaged with plate (16), on one side, with flange (22) projecting slightly above surface of roadway sheet, through slot in sheet of roadway, on other side, prevented from spontaneous extension of frame-comb (1). Tight adjunction of inclined-stop end (21) to plate (16) is provided by spring (24) closed on structure of power set of bridge (2) carriageway. When moving into working position to ridge (22) a vertical force is applied, which turns rocker lock (20) relative to its axis, spring (24) is stretched and inclined-stop end (21) moves simultaneously upwards, being released from engagement with plate (16). End of mounting lever (25) is placed in groove (13), and plug supports (28) of struts (27) are inserted into power holes (11, 12). Then to T-shaped end of mounting lever (25) is applied (directed to the middle of bridge) horizontal force, which moves longitudinal beam (4) with joined with it transverse beams (5, 6, 7) along working holes (8) of vertical walls of ribs of longitudinal stiffness of power set of bridge roadway (2) and reinforced ribs of longitudinal stiffness (9, 10), pulling frame-comb (1) from elements of power set of bridge road (2). As transverse beams (5, 6, 7) move, hinged retainer (17), interacting with upper edge (horizontal plank of upper power belt) of working hole (8) of longitudinal stiffness rib (9) compresses spring (18). Extension extends to the stop of plates (16) in locking bolts (15), wherein hinged retainer (17) is released from action of upper edge (horizontal strap of upper power belt) of working hole (8) of longitudinal stiffness rib (9) and under action of spring (18) fix frame-comb (1) in working position. When translating into transport position to articulated retainer (17) force is applied compressing spring (18), and hinged retainer (17) ceases to rest against upper edge (horizontal strap of upper power belt) working hole (8) reinforced ribs of longitudinal stiffness (9), simultaneously on middle part on longitudinal beam (4) crossbeam of T-shaped end of mounting lever (25) is put on, and frame-comb (1) with transverse beams (5, 6, 7) is inserted into working holes (8), while plate (16) does not reach the edge of inclined-stop end (21) and is not fixed by rotation and lowering (cocking) of rocker retainer (20).

EFFECT: use of the invention will increase the bridge throughput in the working position, improve the overall dimensions of the folded span structures (bridge blocks), providing (if necessary) passing the equipment along the span structure (bridge) installed on the barrier with the broaders in the transport position, reducing time and labor costs when moving the expanders into the working (transport) position, as well as equipment for arrivals to the bridge and ramps from the bridge.

1 cl, 5 dwg