Completed in 1983 by Mole Constructors, the Eastgate Trunk Improvements project involved approximately 1,800 linear feet of tunneling, employing a 76-inch Scott Tunnel Boring Machine. The tunnel was supported by an R&B (rock and bolt) primary liner with a 36-inch RCP (reinforced concrete pipe) secondary liner. The tunneling occurred through methanol-laden clays and utilized cellular concrete annulus backfill grouting.
Project Details
- Owner: Municipality of Metro Seattle
- Location: Eastgate, Washington, United States
- Performed as: Mole Constructors, Inc.
- Project value: $2,817,777.00
- Completion Date: 1983