Title:
Launching a Concrete Bridge Saves
$200,000
Author(s):
David T. Swanson
Publication:
Concrete International
Volume:
1
Issue:
4
Appears on pages(s):
24-29
Keywords:
box beams; concrete construction; girders;
jacks (lifts); post-tensioning; precast concrete; prestressed
concrete; prestressing steels.
DOI:
Date:
4/1/1979
Abstract:
Economy and the unpredictability of the Wabash River in Indiana were major factors in choosing the incremental launching method for a 935 ft long concrete box girder bridge. The superstructure is supported by skewed, solid wall piers founded on rock. A system was designed which involved a launching nose, temporary bridge supports and hydraulic launching jacks to advance the prestressed concrete box girders from the fabrication area across the river. Post-tensioning was accomplished after the concrete reached 3500 psi.