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2017WinterShotcreteEMag

and codes to ensure all peer review engineers had a good understanding of loads and forces. After looking through the peer reviewed drawings, the owner and founder of Domtec, who has been in the dome business for over 35 years, remarked, “This will be the most stoutly constructed cement storage dome in the world.” Fig. 6: Timaru dome air form ready for inflation. The DomeSkin™ air form is 38,350 ft2 (3563 m2) DOME CONSTRUCTION Construction of a concrete dome with an air form is relatively unique compared to conventional methods of concrete construction but allows for rapid construction and superior strength and durability. The method for building domes involves inflating a heavy-duty industrial fabric, which serves as a formwork or “air form.” Domtec’s DomeSkin™ air forms are each custom designed to fit the volumetric capacities of the product to be stored, while also fitting into height and width restrictions of each site. Domes can be built as true hemispheres or a dome on a cylindrical wall and are referred to as “SiloDomes™.” Each SiloDome in New Zealand had to be built within a limited available footprint area, which also resulted in decreasing the cost of the reclaim system. Although the cylindrical part of the dome is more expensive to build than a hemisphere, the money saved by decreasing the floor size and reclaim equipment is typically greater than the additional cost to build a cylindrical portion of a dome structure. The DomeSkin has a dual purpose. It serves as the air form during construction and ultimately, it also performs as the finished exterior roof membrane. The construction takes place on the inside of the DomeSkin, so the dome is built Fig. 7: First pass of shotcrete over first mat of structural bar. Both domes were completed on budget and ahead of schedule 28 Shotcrete | Winter 2017 www.shotcrete.org


2017WinterShotcreteEMag
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