Precast beam method
VSL Group has a good many references in erection of various precast beam structures. Methods of erection have been developed following extensive studies relating to site constraints.
The precast beam method offers fast rates of erection, relatively simple lifting structures, delivery of precast beams possible along completed deck, therefore no disruption caused to existing traffic, small crew size, minimised geometry control and relatively simple prefabrication of beams.
Generally, the way and place of delivery of precast beams to the erection front determines the selection of the erection system. VSL has utilised a whole range of erection systems depending on whether the precast beams were received below, behind or in parallel to the erection system. I beams, U beams and T beams have been used most frequently. Strand and winch lifting units are utilised providing safe and precise placement of lifted elements and high speed of erection. Even a pair of cranes has been used instead of an erection system.