DESIGN AND INSTALLATION OF SCOUR PROTECTION FOR THE ACOSTA BRIDGE

Billy L. Edge, David K. Crapps, J. Sterling Jones, William L. Dean

Abstract


The Acosta Bridge is located in a bend at a natural constriction of the tidally influenced St. Johns River. This natural constriction has resulted over time in scour of the river bottom resulting in present water depths up to 80 feet. The Acosta Bridge is presently being replaced with a new bridge. The existing bridge is located immediately adjacent to a railroad bridge and both bridges are on caisson foundations. Divers have reported that penetration of the foundations for one of these existing bridges is as little as two feet. Construction of the replacement bridge will increase the scour potential. Therefore, scour protection had to be provided not only for the replacement bridge but the two existing bridges. The scour protection for the existing bridges was completed in 1990. The replacement bridge is under construction and scour protection is being installed as the piers are constructed.

Keywords


scour protection; Acosta Bridge; case study

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