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Fig. 3: Application of shotcrete on shaft wall Fig. 2: Elevation view of the shaft repair area removing all support timbers and loose or Fig. 4: Bottom of shaft delaminated rock, installing new steel support columns, installing rock-bolts and reinforcing bar, and applying a minimum of 4 in. (102 mm) of shotcrete. Executing the work in this proce- dure ensured that personnel were always working Shane McFadden, PE, is under a safe, stabilized, and shielded environ- President and Cofounder of ment. Shotcreting operations commenced in Engineering & Construction September 2011 and were completed in February Innovations, Inc. (ECI). ECI is a 2012; the entire project was completed in May heavy civil contractor special- 2012. Approximately 500 yd3 (280 m3) of shot- izing in underground infra- crete was placed on this project. structure rehabilitation, geo- This project was very difficult and risky for technical, grouting, tunnel and many reasons, including working at height, risk shaft construction and rehabilitation, and lock of falling objects, confined space, limited and dam construction and rehabilitation. working room, obstructed access, and restrictive McFadden is a licensed professional engineer physical parameters. Shotcreting with the unique (civil) with over 20 years of experience in heavy mixture design and engineered delivery system civil underground construction. He graduated enabled the project team to deliver the project from Iowa State University with his degree in in a timely and cost-effective manner. construction engineering. 20 Shotcrete • Spring 2013


2013SprShotcreteEMag
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