Big Walnut Creek Augmentation/Rickenbacker Interceptor (tbi0306)
Franklin County, OH
The construction of 225' long cast-in-place box tunnel was completed August 2004. The TBM and all batching plants were all delivered, assembled, and commissioned in October 2004.

Installation of 20,829+ lf of 168" sanitary sewer tunnel using precast concrete segmental tunnel lining; installation of 225+ lf of 14'8" x 14'0" CIP concrete box sanitary sewer by pipe-in-trench (open cut) construction method; installation of 7 access shafts/manhole structures; installation of 615+ lf of 30" and 36" sanitary sewer pipe by a combination of microtunneling or bore and jack method with pipe-in-trench (open cut) construction; installation of 21,054+ lf of Corrosion Protection Lining for 168" Sanitary Sewer and associated structures; installation of 278+ lf of 18" sanitary sewer pipe by a combination of bore and jack method with pip-in-trench (open cut) construction; associated site work and restoration. The construction of 225' long cast-in-place box tunnel was completed August 2004. The TBM and all batching plants were all delivered, assembled, and commissioned in October 2004. The Lovat EPB TBM started mining on November 3, 2004. In October 2006, the TBM finished mining the 20,829 lf tunnel and holed through into the mining shaft on the BWOAS contract. The TBM advance rate averaged over 200 ft per week with the best production day of 21 rings (105 ft) on February 16, 2006, and the best week to date of 83 rings (415 ft) ending February 18, 2006. The precast concrete segment casting operation was completed in January 2006 by CSI/Hanson JV. The construction of 2 separate shallow sewers was completed in September 2006. Hand mining methods were used in lieu of microtunneling. The 36" Hobas pipes have been installed and grouted in place. All jet grouting for the access and drop shafts were completed in July 2005. Drilled access and drop shafts at Manholes #3, 4, 5, 6, and 7 are complete.  Tunnel connection at Drop Manhole 7 remains to be completed.  Construction of (4) ea 100' dewatering wells at Manhole # 7 was completed on February 28, 2008. Dewatering at Drop Manhole 7 will commence upon permit approvals. The tunnel connections at all Access Manholes are complete. Three of the 4 Drop Shaft connections to the tunnel are complete. A large slurry wall has been installed at Shaft/Manhole #2 to provide water cutoff for construction of the large structure as the tunnel drive is complete. Shaft excavation for structure at Manhole #2 was completed on September 27, 2007. Structure #2 slab and walls were completed by December 10, 2007. The roof deck at Shaft 2 remains to be completed. Concrete structure work at Shaft 1 was completed in February 2008. Corrosion protective lining in both structures 1 & 2 remain to be completed. The Linabond Tunnel Corrosion Protective Liner was installed on approximately 11,600 lf  (55.9% complete) of precast concrete segments. Site restoration work remains to be complete at Manholes #1, 2, 3, 4, 5, 6, and 7.

Project Gallery: Construction Method: Earth Pressure Balance Start Date: 01/04 Completion Date: In Progress Owner: City of Columbus, Department of Public Utilities Joint Venture: Jay Dee Contractors, Inc./Michels Pipeline Construction/Traylor Bros., Inc.