On the Job: Micropiles for New Bridge
June 1, 2009
Expansion of the Orange County Convention Center in Orlando, Fla., required a new bridge between the new exhibit hall and the hotels located on opposite sides of the busy Bee Line Expressway. Hayward Baker Inc., headquartered in Odenton, Md., got the assignment.
Two of the planned bridge pier locations were underlain by numerous, closely spaced underground utilities, which could not be interrupted or relocated. The planned driven, precast piling was determined to be too risky for the utilities. A reduced number of higher-capacity micropiles was selected to solve the problem. Through careful probing at each location, the micropiles were threaded past the utilities. The nominal 10-inch-diameter micropiles were drilled and grouted into the limestone formation at an approximate depth of 140 feet. A load test was successfully performed to twice the design load of 165 tons.
A leading specialty geotechnical contractor in North America, Hayward Baker has more than 30 years experience in ground improvement technology.