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2016WinterShotcreteEMag

Corporate Member Profile free and are constructed in volumes ranging from 100,000 gal. (380 m3) to well over 40 million gal. (150,000 m3). Preload water storage tank applications for public entities meet a wide range of demands for different operating requirements and site conditions. Those demands include tanks that are partially or fully buried, have internal baffle walls or mixing equipment, and have various types of exterior architectural treatment. The innovative design and construction techniques invented by Preload continue to be used to safely build high-quality storage tanks with proven long-term durability. Many of these design and construction techniques have been adopted as industry standards in American Concrete Institute (ACI) and American Water Works Association (AWWA) publications. In addition, new innovations have been developed by Preload engineers over the past 85 years to increase the life expectancy and reliability of prestressed concrete storage tank structures. These include the incorporation of a ribbed steel shell diaphragm, which is now an integral part of the tank and provides impervious watertight service as well as the development of base restraint details, which ensure safe performance of the tank structure in high seismic areas and in those situations where tanks require differential backfill. New methods of construction have been developed as well, including the use of precast tilt-up core walls, which brought additional options and flexibility to the construction of quality prestressed concrete tanks. Shotcrete continues to be a primary material in the construction of the tank—both in the construction of the core wall and, more prominently, to encase the steel shell diaphragm and high-strength prestressing wires. Preload employs many ACI Certified Shotcrete Nozzelmen who are well-trained experts in the application of wet-mix shotcrete to ensure excellent quality in the finished tank structure. Preload’s construction staff is specialized and highly trained in the techniques necessary for producing results that meet high levels of quality, expediency, and safety. The staff includes personnel that have each been responsible for successfully constructing hundreds of prestressed concrete storage tanks. Preload’s construction staff and its top management approach each project with the objective of ensuring that both the client and community are fully satisfied with the decision to use Preload. Since its inception, Preload has built its business on customer satisfaction, quality, timely project completion, safety, and competitive pricing. The high level of repeat business achieved by the company is evidence of Preload’s ability to exceed the expectations of its clients. Fig. 2: Architectural treatment on top of shotcrete exterior for prestressed concrete ground storage tank, Fredrick, MD, 2009 Fig. 3: 6.0MG wet weather storage tank built by Preload in 2013 for the Metropolitan St. Louis Sewer District and winner of numerous awards, including the 2014 ACEC Missouri Grand Award, the 2013 Keystone Award by the Associated General Contractors (AGC) of St. Louis, and the 2013 Quality Concrete Award by the Concrete Council of St. Louis Fig. 4: Application of wet-mix shotcrete to steel shell diaphragm of prestressed concrete tank wall Preload LLC 4000 Tower Road Louisville, KY 40219 Phone: (631) 231-8100 Website: www.preload.com Shotcrete • Winter 2016 73


2016WinterShotcreteEMag
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