Seattle Tunnel Partners
SR99 Viaduct Replacement Tunnel Project
SIZE / CAPACITY
- Conceptual Design
- Mechanical Engineering
- Fabrication of all Equipment
- On-Site Training and Site Support
- 40’ Heated Container
- Tornado 1600 Colloidal Mixer
- 4000 litre Agitation Tank
- Three 108 m3 Capacity Silos
- Three Screw Conveyors
- Automated PLC/MCC Control System
- Pneumatic System
- Admix System
- Water Weigh Hopper
- 100 mm Grout Peristaltic Pump
- Two 50 m3 Heated Accelerator Tanks
- 50 mm Accelerator Peristaltic Pump
In July 2013 the world’s largest diameter tunneling machine began a historic journey beneath downtown Seattle. Its purpose: dig a tunnel to replace the State Route SR 99 Alaskan Way Viaduct, a double-deck highway that has spanned the downtown waterfront for more than half a century but was damaged in a 2001 earthquake.
The project includes a 1.7 mile long tunnel beneath downtown Seattle, a mile-long stretch of new highway that connects to the south entrance of the tunnel, near Seattle’s stadiums and a new overpass at the south end of downtown that allows traffic to bypass train blockages near Seattle’s busiest port terminal.
Team Mixing Technologies Inc. provided a 30 m3/hr capacity bi-component (A/B type) grout plant, with colloidal mixer, to feed the giant 17.6m (58 ft) diameter Hitachi-Zosen manufactured TBM. Also provided were insulated and heated 50 m3 capacity sodium silicate storage tanks along with a peristaltic pump to transfer the accelerator to the TBM.