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2015WinterShotcreteEMag

Fig. 1: Beam profile and edge forming Fig. 3: Plumbing system under shotcrete shell Fig. 2: Application of sacrificial shotcrete layer Fig. 4: Steel reinforcement on radius steps for soil containment crete process (approximately 5 yd3 4 m3) to the vertical soil prior to reinforcing bar installation. Although the water table is below the pool structure, the soil is very dense and retains mois- ture. Because the clients plan to add all sorts of plantings, there would be a large amount of water flowing around the structure that could be retained by the soil, which could create a hydrostatic imbalance when the pool is drained down the line for maintenance. They also wanted the hole to remain dry during construction (Fig. 3). For all these reasons, a layer of gravel and a system of Fig. 5: Floor shotcrete (placed in stages) 4 in. (102 mm) drainpipes were installed in the pool floor to dewater the pool every day from now until eternity. It’s always good to have drainage around an in-ground concrete structure. While shells are built to be watertight, they are not meant to function as underground dams. Shotcrete Installation Drakeley employs a crew of eight men: two ACI Certified Shotcrete Nozzlemen, one pump operator, two tenders, and three finishers. All crew members are trained on proper safety proce- dures—not only in pumping mechanics but also in shotcrete applications based on ACI CP-60, Fig. 6: Wall shotcrete and gutter detail “Craftsman Workbook for ACI Certification of Shotcrete Nozzlemen.” The shotcrete crew is also They installed 270 yd3 (200 m3) of concrete up-to-date on all current swimming pool shotcrete material using wet-mix shotcrete application position statements from ASA. (Fig. 4 through 6) for an average daily installation Shotcrete • Winter 2015 27


2015WinterShotcreteEMag
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