DSM was designed to be installed into the dense Colma Sand 2’ to 5’. The General Contractor designed a temporary excavation support wall with wide flange beams with some beams on two foot centers, 45 beams total. This project is designed to support the structural concrete for the new US 101 highway, tunnels and bridges.
The Sacramento River Flood Control System includes dams and reservoirs, levees, weirs, bypasses, and other features built over the last 150 years. Approx. 980 mi of levees in this complex system protect urban and rural areas within the Sacramento River Watershed of 27,100 mi2 from frequent flooding, and have prevented billions of dollars in damages.
A major component of the City and County of San Francisco’s Justice Facilities is a new Public Safety Building. The state-of-the-art building houses the San Francisco Police Department Police Command Center, the Southern District Police Station and a neighborhood San Francisco Fire Department Fire Station. RSW was installed for excavation support wall of the basement.
The retaining wall portion of the work was design-build. Raito performed this portion of the work including beams and tie-backs. Soil types in the improved zones included loose sand and high plasticity clay. DSM walls were installed for temporary excavation support until a concrete structure for the road-way under-crossing was built.
A lined and covered off stream reservoir, has a total storage capacity of about 177 million gallons and is the largest potable water reservoir in San Francisco. Geotechnical investigation revealed that the saturated native sands and silts could be susceptible to significant strength loss during a major earthquake. DSM was selected as the preferred remediation technique from various alternatives.
The earth-fill San Pable Dam was built in 1920, creating a drinking water reservoir and recreation area notheast of Berkeley. Fill for the dam foundation was hydraulically placed, which can result in poor performance during seismic shaking. DSM was chosen to mitigate liquefaction in the downstream toe of the dam foundation.
In 2005, Hurricane Katrina and Rita made landfall, causing major damage in southwest Louisiana and the Louisiana-Texas state line. Raito performed DSM for the WBV Hurricane Protection Project for the U.S. Army Corps of Engineers, New Orleans District. This project included reinforcement of flood walls for high water events in the Westwego to Harvey area.
The construction of Berths 57/58 at the Port of Oakland required the stabilization of a cut slope under a proposed container wharf extending 2,400 ft. Over 60,000 cubic yards of DSM ground stabilization was constructed over a period of five months. Triple-shaft DSM equipment with a real-time monitoring system was used for ground stabilization.