Completed in 1985 by Mole Constructors, the Onion Creek Interceptor Tunnel, Section 4 project involved 29,368 linear feet of 110-inch tunnel, employing a 110-inch Lovat Tunnel Boring Machine, a 117-inch Lovat Tunnel Boring Machine, and a 118-inch Scott Spider. Excavation took place through claystone at depths ranging from 50 feet to 110 feet. Cellular concrete annulus and backfill were utilized, followed by monolithic contact grouting.
Project Details
- Owner: City of Austin Water Utility
- Location: Austin, Texas, United States
- Performed as: Mole Constructors, Inc.
- Project value: $8,592,869.00
- Completion Date: 1985