US Capitol Visitor Center

Category
Utility

Client
Architect of the Capitol
William V. Walsh Construction

Location
Washington, D.C.

Key Challenges & Project Details

• Relocation of existing water mains and storm drains on the perimeter of United States Capitol’s East Plaza to allow construction of the US Capitol Visitors Center
• Location is one of the oldest, most congested and most prestigious sections of Washington, D.C.
• Corman offered expertise to develop technical solutions for site condition conflicts encountered during construction
• Involved water distribution systems including: 400 LF 12″ north fire protection, 500 LF 12″ and 8″ south fire protection, 200 LF 8″ domestic water, 2,400 LF 12″ main loop and feeder system, and a 3,000 LF 30″ water distribution system
• Each system required construction of various structures and appurtenances
• Two storm drainage systems were facilitated, including a 20′ deep, 60″ diameter liner plate tunnel under existing pedestrian tunnel
• Removed and permanently bulkheaded sections of several existing tunnels for utilities installation
• Installed 24” line stop bypass/valve insertion
• Incorporated mechanical soil anchors into thrust blocking
• Corman/DCWASA developed alternate path for 36” water line along Maryland Ave
• Stringent security provisions
• Vehicle security barrier construction
• Installation of Nasatka automobile barriers around the complex for the Architect of the Capitol
• Excavated trench system across major streets and around Capitol
• Installed conduit system for electrician
• 10 x 20 x 10 vault street and sidewalk installation for hydraulic gear to remotely power barriers