 Permanent DYWIDAG Anchors with DYNA Force® Sensors at new San Francisco General Hospital and Trauma CenterSan Francisco General Hospital, the region’s central trauma center, required an additional facility that had to be built in accordance with the State of California’s current earthquake standards. According to state law, emergency hospitals must be designed and built to remain operational even after a major earthquake. A new nine story building is under construction between the existing hospital buildings. Two floors of the new structure are located underground and the Trauma Center will be linked to the old complex by a tunnel and a bridge. 150 double corrosion protected (DCP) Ø 46mm DYWIDAG THREADBAR® Anchors were used to tie down the mat foundation to the bedrock with base isolators. The retaining wall built around the excavation required the use of 1,050 permanent double corrosion protected (DCP) Ø 32, 36 and 46mm DYWIDAG THREADBAR® Anchors. The shoring engineers decided to add 11 DYNA Force® Sensors spread around the wall to the anchors in order to monitor the wall’s movement during construction. The sensors were factory installed over the threadbars in the unbonded length and inside the PVC protection sheathing. The sensors were also used to monitor load during cycles loading of the proof or performance test and remained functional during the remaining wall construction as excavation progressed. As expected, the wall movement was insignificant, and the sensors proved themselves as a reliable load monitoring system. Construction of San Francisco General Hospital began in 2010 and is scheduled for completion in 2015. |