Construction Today - September 2011 - (Page 114) Kenny Construction Co./ Obayashi – OARS project Commercial | KENNY CONSTRUCTION CO./ BAYASHI – OARS PROJECT www.kennyconstruction.com • Project cost: $264.5 million • Location: Columbus, Ohio • Scope: Sewer construction Kenny Construction Co.: “The OARS tunnel is sized to provide adequate conveyance for all storms in a typical year.” Underground Success W hen it comes to complex underground utility projects, an experienced contractor realizes soil conditions will make or break a successful delivery. Kenny Construction sent a project team to Columbus, Ohio, that understands what it takes to deliver the Olentangy-Scioto Intercepting Sewer Augmentation Relief Sewer (OARS) project in a joint venture with Obayashi. “The ground is the boss,” says Bob Rautenberg, project manager for Kenny Construction. “The biggest challenge of this project is mining the ground.” In October 2010, Kenny/Obayashi was awarded the first phase of the OARS project, which involves the construction of a 22-footdiameter deep tunnel wastewater conduit that will relieve the existing Olentangy Scioto Interceptor Sewer. This tunnel will be approximately 4.5 miles long and will be built into the bedrock at a depth of 170 feet. Special drop structures will be constructed to direct flow from shallow sewers to the deep tunnel, according to Kenny Construction. Inlets with de-aeration chambers will dissipate energy and minimize air entry into the tunnel, the company says, and a pump system will dewater the tunnel after high-water events and direct water to the Jackson Pike Waste Water Treatment Plant. This phase also includes a 52-foot-diameter pump station shaft, a 42-foot-diameter screen shaft and a 48foot-diameter shaft with an internal surge chamber and hydraulic drop pipe. “The OARS tunnel is sized to provide adequate conveyance for all storms in a typical year,” Kenny Construction says. “Its 54 milliongallon capacity will significantly reduce overflows in the downtown Columbus area.” Kenny/Obayashi earned the contract with a low bid of $264.5 million. The construction team broke ground in fall 2010, and completion is expected in June 2015. Specially Made As managing partner of the joint venture, Kenny Construction worked closely with Nicholson Construction Co. Nicholson performed pre-excavation grouting and constructed overburden support of excavation at the 52foot and 42-foot diameter shafts. Nicholson will perform the same construction services at the 48-foot-diameter shaft beginning in 2012. The tunnel will be mined through Karstic limestone. This type of material can prove chal- KENNY CONSTRUCTION AND OBAYASHI WILL DELIVER THE FIRST PHASE OF A MAJOR SEWER RELOCATION PROJECT. BY BRIAN SALGADO 114 CONSTRUCTIONTODAYMONTHLY.COM SEPTEMBER 2011 http://www.CONSTRUCTIONTODAYMONTHLY.COM Table of Contents for the Digital Edition of Construction Today - September 2011 Construction Today - September 2011 Contents Alternative Energy Best Practices Incentive Programs Marketing Strategies Residential DSLD Homes AvalonBay Communities Inc. Aquilini Development and Construction Inc. Pratt and Associates LLC Wermers General Contractors – Civita Coastal Construction – Camillus House Institutional Beauchamp Construction Co. Inc. – Scott-Carver HOPE VI, Phase 2 Ratcliff Construction Company – Crossroads Church The Walsh Group – NOAA Pacific Regional Headquarters KenMor Electric L.P. – Alkek Hospital Expansion Mouw Associates – Bethesda West W.E. O’Neil Construction Co. – Ray and Joan Kroc Corps Community Center Charles Perry Partners Inc. – North Florida Regional Medical Center Cleveland Medical Mart & Convention Center Skanska USA Building – University of North Carolina Hospital, Hillsborough U.S. Army Corps of Engineers – Fort Stewart, Ga. Commercial Global Gaming Solutions LLC – Remington Park Scaparotti Construction Group Sirina Fire Protection Corp. WELBRO – Hyatt Regency New Orleans Advanced Real Estate Services TSI Kenny Construction Co./Obayashi – OARS project Reid & Associates Design Builders Industrial Samsung Austin Semiconductor Long International Inc. Freeport-McMoRan Copper & Gold Parkson Corp. Trion Civil Balfour Beatty Construction – Hays County Government Center Bouygues Civil Works Florida – Port of Miami Tunnel Walsh Austin Joint Venture – Tom Bradley International Terminal, Los Angeles International Airport Integrated Facilities Solutions Inc. – NorthShore University HealthSystem, Skokie Hospital Guam International Airport Authority Walton Construction – Village de Jardin John Sealy Hospital P. Agnes Inc. – Lankenau Medical Center Canada Best Buy Canada Ltd. Nova-Con Projects Ltd. The LaCaille Group EllisDon – Atlantic Region George Brown College – New Waterfront Campus Fortis Properties Corp. 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