My first Magazine dsi-info-23-en | Page 145

Construction—North America—USA—Structural Repair Solutions For those ducts that had incurred major damage over the years in the form of splitting and cracking, DSI designed and installed a special split duct system for permanent repair. All of the existing voids inside the post- tensioning tendons were filled by DSI using a vacuum or vacuum-assisted grouting method. The largest challenge to overcome on the project was the access to the work areas inside of the precast segments. This was primarily done from directly underneath the bridge segments through integrated hatches that were many times located directly above heavy traffic areas of street level roadways and parking lots. This demanded considerable traffic control with lane closures and the need to complete a significant amount of the work at night. Despite the large project footprint and other challenges encountered, DSI completed all repair measures within the contract timeframe of just over two years. DSI’s crews worked safely on these structures, logging over 75,000 man hours to complete the work. Owner Texas Department of Transportation (TXDOT), USA General Contractor SCR Construction Co., Inc., USA DSI Unit DYWIDAG-Systems International USA Inc., Structural Repair, USA DSI Scope Design, production, supply, installation, technical support, grouting DYWIDAG Products Anchor caps, duct system 145