Tampa-Hillsborough Expressway Authority has settled in full with the insurers of URS Corp., San Francisco, for $74.75 million in claims for the 2004 collapse of a section of elevated highway during construction. Three piers sank under a 140-ft post-tensioned section in April 2004 on the 9-mile-long Reversible Express Lanes project. One of them sank 11 ft and the others a few inches, says Sue Chrzan, Authority spokeswoman. The mediated agreement was reached without determining a cause of the collapse. FIGG Engineering Group, Tallahassee, Fla., designed the box-girder structure, and the Authority will receive $750,000 previously escrowed for claims resolved with
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.