METHOD FOR INCREMENTAL LAUNCHING OF BRIDGE SPAN Russian patent published in 2010 - IPC E01D21/06 

FIELD: construction, road engineering.

SUBSTANCE: method relates to the field of bridge engineering and may be used to cover navigable span of recovered bridge. Method for incremental launching of bridge span includes assembly of span on embankment of approach zones, assembly of launching nose, installation of traction braking and lifting devices, and also its launching. The novelty is the fact that in process of incremental launching of single span by proposed method, length of launching nose makes 0.25-0.5 of span length. Launching of span includes two stages. At the first stage main beams of span are combined into continuous system, by means of partial launching of inner beam into outer one and closing by temporary fixing devices, where inner beam during launching serves as counter-weight. With the help of traction devices span is launched into bay. At the second stage launching nose is disassembled, continuous system is brought to split one, by means of complete insertion of the main inner beam into outer one with the help of traction devices, besides outer beam is anchored and simultaneously serves as knurling scaffolds for the inner one. Anchor fixtures are dismantled, and the structure is lowered onto supports into design position.

EFFECT: observance of navigation conditions in process of incremental launching of span and reduced material intensity of launching nose.

1 cl, 2 dwg