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2013WinShotcreteEMag

2012 Outstanding Pool & Recreational Project coastal maine Negative-Edge Pool By Mason Guarino Afeatures other than the surrounding forest needed to be constructed first to create a deepremainder of the pool (Fig. 1 to 3). The negative-edgefeature, including the spillway wall and trough,coastal Maine home sat alone at the end ofa long driveway with little to no property floor and an elevated view of the ocean. But that footing that would reach below the frost line. In was slated to drastically change when the home- the first mobilization, the trough area was excavated owners asked South Shore Gunite Pools & Spas, to the required depth and then over-excavated on Inc., to work with their architect and builder to the pool side to allow us room to construct forms. install a spectacular pool. The land had a natural For the future, well-draining fill material was slope to it and, with the ocean view, created an required under the pool. After excavation, extensive ideal venue for an architectural masterpiece. After plumbing was installed, followed by form erection some meticulous design and planning to incorporate and placing of the pool shell reinforcing steel, and the project into the natural Maine landscape, the then shotcreted with dry-mix shotcrete. Some of pool concept was complete. The pool would have the reinforcing steel in the trough wall extended a negative edge toward the forest side and a beach out from the wall to allow for subsequent tie-in entry on the house side. The pool design kept the with the pool floor. water level with the pool coping and decking Next came the pool itself. After the trough and around the pool. The final product would have a spillway wall were completed, the pool floor area very dark, natural look to it. was backfilled with free-draining crushed stone The difficult part was creating the drawings— that would prevent any water buildup and potential detailing how to best build the pool to last in the heaving due to the freezing winter temperatures. harsh Maine climate with everything functioning Everything within 4 ft (1.2 m) of potential exposure correctly. Freezing winter temperatures required to freezing air temperatures was filled with a significant foundation constructed with dry-mix crushed stone or dry-mix shotcrete, as frost heave shotcrete and clean, crushed stone. The complexity does not just affect horizontal sections of the pool of the pool required it to be constructed in specific but could also impact vertical sections that line phases; the first phase included the negative-edge the spillway. The pool had a shotcrete perimeter portion, followed in the second phase by the gutter that would later provide the overflow and Fig. 1: Stone underlayment along with the reinforcing bars penetrating out of the first phase of construction so Fig. 2: Elaborate reinforcing required by the pool design as we the second-phase pool section could be tied in correctly start the second phase of shotcrete 32 Shotcrete • Winter 2013


2013WinShotcreteEMag
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