The Cosmopolitan Resort & Casino, Las Vegas, NV Specialty Foundation Work Under Extreme Conditions

This past spring of 2006, BENCOR installed the concrete reinforced diaphragm walls for the COSMOPOLITAN RESORT & CASINO in Las Vegas, Nevada. The project highlights include the excavation of approx. 326.000 square feet of reinforced diaphragm slurry wall with a thickness of 30 inches and a depth of 100 feet using three reverse circulation trench cutters (hydromills) at the same time. The reinforcing steel cages were fabricated on the 8 acre jobsite and approximately 12,000 cubic yards of 4500 psi concrete was placed via tremie. The jobsite logistics of coordinating three trench cutters and three separate desanding/slurry plants as well as the reinforcing steel fabrication and concrete placement all under a very tight schedule was quite challenging. A second main exercise was the execution of a temporary excavation support. As the excavation depths extends between 66 and 72 feet, five to six rows of temporary tieback anchors were required. Anchor lengths range from 43 -83 feet at a maximum design load of 235 kips.