HDR is a U.S. design firm that specializes in various services including engineering, architecture, environmental, and construction. HDR is currently ranked as No.6 design firm in the world with various famous projects such as the Hoover Dam Bypass, Singapore Changi Airport, and the Tappan Zee Bridge Replacement. Furthermore, HDR is a company that is known as an employee-owned company, or Employee stock ownership, where employees are given company’s stock as part of the bonus or compensation.
HDR is also known for its world-renowned knowledge and expertise in bridge design and engineering. With more than 600 bridge specialists working on various complex and challenging bridges, HDR has provided innovative solutions to its various bridge projects around the world. Moreover, by using the latest technologies such as BIM, structural health monitoring systems, and accelerated bridge construction approach, HDR has been able to achieve its client’s goals.
One engineering technique HDR is very proud of is its advanced Accelerated Bridge Construction (ABC) technique. This technique is used for replacement of bridges that have been damaged or aged over time. HDR focuses on two very popular methods: The first ABC method includes transporting and replacing a bridge with a completely new structure. This method is carried out by building a completely new bridge on temporary piers next to the bridge that must be replaced. When the new bridge is completed, the old bridge is demolished and the new bridge is transported by modular transporters. The second ABC method HDR is famous for is its prefabrication of the replacement structure using modular parts. By doing so, the quality of the new structure will be met and construction time will be greatly reduced.