| Project Name: |
Big Walnut Outfall Augmentation Sewer, Part 2 |
| Location: |
Columbus, OH |
| Owner: |
City of Columbus, Division of Sewerage and Drainage |
| Construction Manager: |
H.R. Gray & Associates, Inc.
|
Engineer:
|
URS, Lachel & Associates, Inc.
|
| Tunnel Dimensions: |
(Finished) 13,200' x 12'-0" |
| Excavation Method: |
167" Earth Pressure Balance Lovat TBM |
| Tunnel Support: |
9" Thick Steel Fiber Reinforced Concrete Segments |
| Geology: |
Glacial tills then sands, gravels cobbles and boulders. 2 Bar water pressure
|
| Shafts: |
40'-0" Dia. Slurry Wall Main Shaft with 10'-0" Dia. Auger Access Shafts |
| Structures: |
Four Structures to allow by-passing and connection to live 108" main outfall sewer. |
| Dates: |
October 2004 - September 2008
|