摘要: |
In May, Ames Construction replaced it with a new, 695-foot-long structural steel bridge that rises from the canyon floor in Tonto National Forest, providing one 12-foot-wide lane for traffic in each direction and 10-foot-wide shoulders. Built adjacent to the existing historic bridge, the new bridge is supported by three sets of piers. At 138 feet, the tallest piers were constructed with a single continuous pour that required crew members to climb down into the formwork to ensure there were no voids in the concrete. The project made use of a micro-pile foundation system for several retaining wall structures that stood more than 30 feet. Micro-pile systems are not used as often as spread footings of drilled shafts. The design team developed standards and specifications that allowed the contractor to implement this system and provide a case study of using this technology and foundation system. |