photo courtesy of Timothy Hursley Crews logged 291,000 man-hours without an accident while renovating the 200,000-sq-ft St. Louis Central Library. Related Links: 2013 Best of the Best Projects Winners Best of Midwest: St. Louis Central Library Despite difficult working conditions, including an extremely cramped area when converting a sub-basement coal bin into an auditorium, crews logged 291,000 man-hours without an accident while renovating the 200,000-sq-ft St. Louis Central Library. The sub- basement was one of several outmoded spaces that workers adapted to new uses in the 100-year-old landmark structure, originally designed by Cass Gilbert.General contractor BSI Constructors Inc. executed a
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.