Tunnel Business Magazine

JUN 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.

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TUNNELINGONLINE.COM F E A T U R E S T O RY How did you get involved with the tunneling industry? I grew up on a farm south of Bakersfield, California, and I actually had planned to be a farmer. It was on the farm that I got practical experience with machinery, which led me to pursue a degree in mechanical engineering at UC-Berkeley. From there I went to work for a shipyard in Seattle, and in 1988, I went to work for The Robbins Company. What was your first experience in tunneling? I first started working in the conveyor department, but quickly began working with roller cutters. Almost immediately after that I was sent to a proje y to learn more about the business and what crews were experiencing. At the time, V-Block cutters were predominant, but that design led to lots of broken fixation bolts which caused excessive downtime and delays. Cutterhead maintenance costs were very high, and it could take up to 4 man-hours just to fish a broken bolt out of the cutterhead. It was a bad situation. So when I got back to Seattle, I was assigned as part of a team of young engineers to come up with a better way f planned for the Svartisen Hydroelectric Proje y . Together we developed the first front-loading Wedge-Lock cutter mounting system for 19" cutters. That has evolved into the back- loading design that is the predominant cutter housing today. It is still amazing to me that my boss at the time, John Gibson, on the cutting edge A Conversation with Herrenknecht's David Krauter avid Krauter, a mechanical engineer for Herrenknecht, has spent three decades in the tunneling industry, most of them directly involved in cutters and excavation tools. Throughout that time, mechanized tunneling has improved in its efficiency and reliability across the board, including the cutters themselves. We sat down with Krauter to discuss his background as well as the past, present and future of cutter technology. d 2 8

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