- Alaskan Way Viaduct / SR 99 Tunnel Replacement
- LA Metro Southwestern Yard Crenshaw/LAX Transit Corridor
- SeaTac North Satellite Expansion
- AltaSea at the Port of Los Angeles
- LA County Metropolitan Transportation Authority Expo Line Operations & Maintenance Facility
- McCarran Airport - Central Utility Plant
- San Francisco International Airport
- SeaTac Airport Rental Car Facility
- Vacaville Transportation Center
- Caltrans District 3 Headquarters
Alaskan Way Viaduct / SR 99 Tunnel Replacement
Glumac, under contract to JH Kelly, provided comprehensive commissioning services for the Replacement Tunnel project on the Alaskan Way Viaduct.
Glumac provided commissioning services for the systems serving both the tunnel itself and the operations buildings at each end. The data for each of these facility process systems travel through the central supervisory control and data acquisition (SCADA) system, which centralized all functional testing on the project.
The replacement tunnel carries approximately 110,000 vehicles per day to their destinations and allowed for demolition of the previous viaduct structure, which was part of the transformative Seattle Central Waterfront redevelopment process.
The replacement tunnel was bored with the world’s largest tunnel borer (nicknamed “Bertha,” after Seattle’s only female mayor, Bertha Knight Landes), which featured a 57.5 foot diameter, weighed 900 tons, cost $80 million.
- Mechanical, Electrical, Plumbing
- Building automation
- Fire suppression and smoke control
- Toll readers
- Carbon monoxide
- Communication systems, including telephone, cellular phone,two-way radio and AM/FM radio
- Intelligent transportation systems, including a video-based detection system, used for detection of traffic that causes slowdowns or blockages, and CCTV
- ENR Northwest 2019 Highway/Bridge Best Project Award
Size: 4-lane, 2 miles long
Construction Cost: $4.25 billion
Start / End Date: 2012 – 2019
Architect: HNTB Architecture (part of Seattle Tunnel Partners joint venture team)
Design / Build contractor: Seattle Tunnel Partners (Dragados USA and Tutor Perini Corp. joint venture)
Owner: Washington State Dept. of Transportation
Image courtesy of WSDOT/Wikicommons
From a deluge system capable of pouring as much as 17 inches of water per square foot, to the 300 cameras monitoring traffic, Seattle’s SR 99 tunnel might be one of the safest, most well-monitored spaces in the city. Traffic now passing below downtown is doing so in a tunnel designed to withstand a 9.0 earthquake and within seconds can alert drivers to anything from a multi-car pile up to a bucket that’s flown off the back of a truck. | Read More