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2014FallShotcreteEMag

Goin’ Underground In August 2012, shortly after construction began, history met modern day when certain steel pilings were found at the end of a tunneling drill bit. The drill bit needed to be replaced, but the pilings were soon removed and construction soon resumed. The use of shotcrete continues to play a major role in many of Toronto’s ongoing tunneling projects, including the continued expansion of The Toronto Transit Commission subway system, the upgrading of Toronto Hydro’s tunnel network, and the progress of a number of significant water distribution projects. Matt Croutch is a Technical Sales Representative for King Packaged Materials Company, Burlington, ON, Canada. He has 10 years of experience in the concrete construction industry, including the last 4 years working with shotcrete. Fig. 3: Over 1200 tons (1010 tonnes) of King Croutch is a member of the American Concrete MS-D3 Accelerated Macro-Synthetic Fiber Institute, the Building and Concrete Restoration Reinforced Shotcrete were applied throughout Association of Ontario, and has been active in the the 550 ft (170 m) tunnel using an Aliva AL 252 promotion of the shotcrete process in the Ontario, dry-mix shotcrete machine Canada, market. Fig. 4: Three-dimensional cross section of pedestrian walkway. Billy Bishop Toronto City Airport Pedestrian Tunnel Project 40 Shotcrete • Fall 2014


2014FallShotcreteEMag
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