Completed in 1995 by Mole Constructors, the Upper Scioto West Interceptor Sewer, Part 2 project consisted of 6 shafts ranging in depth from 70 feet to 95 feet and 9,700 linear feet of rock tunnel. The shafts were supported in the soft ground portions using liner plates and internal steel ribs. The rock portions of the shafts were excavated using conventional drill and blast methodologies and supported using rock dowels, mesh and shotcrete. The tunnel was excavated using 128-inch and 118-inch Lovat Tunnel Boring Machine’s (TBMs). The tunnel received 84-inch, 78-inch, and 72-inch reinforced concrete pipe with Ameron (T-Lock) lining, the pipe was grouted-in-place using light weight grout. This project has an identified buried valley mid-way through the alignment. Jet grouting was utilized to improve the ground in advance of the TBM and the 128-inch LOVAT successfully excavated this portion of the tunnel.
Project Details
- Owner: City of Columbus, Department of Public Works, Division of Sewerage and Drains
- Location: Columbus, Ohio, United States
- Performed as: Mole Constructors, Inc.
- Project value: $22,133,960.00
- Completion Date: 1995