Tunnel Business Magazine

OCT 2018

TBM: Tunnel Business Magazine is the market leader for North America. TBM is written for leading professionals in all aspects of tunneling and covers project stories, design elements, contracting strategies, legal issues, new technology and more.

Issue link: http://digital.tunnelingonline.com/i/1042145

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Page 15 of 47

TUNNELINGONLINE.COM 1 6 TBM: TUNNEL BUSINESS MAGAZINE // OCTOBER 2018 moval. The side-mounted conveyor is somewhat standard in design, but the system also happens to be the 100th continuous conveyor that Robbins has provided be- e than any other conveyor manufacturer. The system consisted of a main drive, splice stand, storage unit, and advancing tailpiece, operating through several curves requiring patented self-adjusting curve idlers that adjust belt tension based on the belt load. The system discharged onto a customer-supplied overland conveyor, which delivered the muck to a large storage yard near the portal site. Challenging Tunnel Drive d from its portal site Oct. 20, 2017 with a depth to invert of approximately 40 ft through a jet grout plug installed to provide a controlled launch environment. Cutterhead clogging was a problem in the initial section, but crews were able to overcome it. "One of the most challenging aspects of this job was that we launched right into the most difficult part. We had 200 ft of soft ground, a very short reach, and then from there we went right into a mixed face for 600 ft," said David Chastka, Project or Kenny Construction. "It took everybody we had in the industry, everybody from Robbins, to fight through that first 800 ft." While in soft ground and mixed face conditions, the machine operated in closed mode, but once it hit solid rock crews switched excavation to open mode. "The machine had the power to get to the other side and made advance rates we never thought we were going to get. It was very successful in hard rock," said Chastka. Advance rates once in full-face shale rock reached a high of 111 ft in one day (two uck removal was achieved the Robbins continuous conveyor, and conveyor availability remained high throughout the project. "I am most proud of the team that I have had the pleasure of being a part of," said Don Smida, Robbins Field Service Technician. "The overall scope of a project of this scale is immense, and the amount of daily cooperation and hard work that has been asked of The Robbins Company, the local unions, city staff, and Kenny-Obayashi is extremely important in reaching our common goals. I think we should all be proud of our teamwork going forward from a successful completion of the tunnel and into a successful disassembly of Rosie." t tunneling is complete, the machine will be disassembled and removed from its retrieval shaft this autumn. "The Ohio Canal Interceptor Tunnel is the largest public improvement project in our City's history and a significant investment in our environment and infrastructure that will benefit Akron residents and businesses for generations to come," said the City of Akron yor Daniel Horrigan. "I am incredibly proud that the tunneling portion was completed without any major injuries, thanks to a dedicated team of professionals. And although Robbins is an international company with worldwide impact, we were pleased to be able to work with a lo oject." 8LI6SFFMRW'VSWWSZIV<6)QEGLMRIŪXLIƤVWXWYGLQEGLMRIXSSTIVEXIMR the U.S.—achieved advance rates of up to 111 ft per day in two 10-hour shifts. The 1.17 mi long EPA-mandated OCIT Project for the City of Akron, Ohio, USA consists of the construction of a conveyance and storage tunnel system XSGSRXVSP'SQFMRIH7I[IV3ZIVƥS[W'73WJSVWIZIVEPVIKYPEXSVWMRXLI downtown Akron area. C O V E R S T O R Y

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