Concrete Products

JUL 2014

Concrete Products covers the issues that attract producers of ready mixed and manufactured concrete focusing on equipment and material technology, market development and management topics.

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24 • JuLY 2014 www.concreteproducts.com When Clackamas, Ore.-based Marks Metal Technology received an inquiry about a form that would mold a giant concrete water bot- tle, Steve Tuttle of the company's concrete division initially believed it was an impossi- ble project. However, after some reflection he realized it was not only possible but would be more efficient to produce if it was created "as if it were a series of machined joint rings, stacked one on top of the other." Partnering with longtime customer Rockway Precast of Las Vegas, Nev., Marks Metal was able to propose a stable, 15-ft. 1-in. concrete model for The Water Bottle NV, LLC, operated by Dapper Companies. The Las Vegas developer sought a solution to which precast concrete is uniquely suit- ed: A structure produced in easily repeat- able sequences and exhibiting smooth, aesthetically pleasing surface characteris- tics for users seeking quality alternatives to marginal tap water. By laminating a series of rolled heavy steel bars into manageable shapes, Marks Metal was able to create the complex ex- terior bottle profles. To ensure that the required two-piece form would hold its shape under the extreme conditions of casting a large product, all of the heavy machined profles were thermally stress relieved in a shipyard oven. This guaran- teed that the form would pull apart easily and go back together without distortion. Afterwards, the steel bars were machined into a portion of the water bottle profle on a 176-in. diameter CNC vertical boring mill. When all of the precision machined pieces were fnished they were stacked in the correct order to produce the many curves needed to yield a jumbo version of a typical 5-gal. drinking-water vessel. The complex shape of the water bottle was digitized from an architect's render- ing. This exact profle was used to create the steel shapes that were directly pro- grammed into Marks Metal's large vertical boring mill. The inside of the form was hand blended to make sure all of the seams in the steel had minimal transfer to the concrete. According to Tuttle, "one big challenge was how to keep the vertical seams where the form splits tight so they didn't leak and re- sulted in a minimal seam sign on the con- crete product. There are no secrets here. This was done by expert craftsmanship on our shop foor and it turned out nearly perfect." The blockouts for the sign, vending stations and access door were especially challenging; they required the form pieces to be modeled in Autodesk Inventor to create the complex steel patterns that would produce precisely sized openings. Marks Metal Technology, in continuous operation since 1947, was well geared to building this type of form. Other than the thermal stress relieving, the two-piece form was made entirely in-house: the engineer- ing, detailing, rolling, machining and fabri- cation. The company has over 45,000 square feet of inside production area under several overhead cranes. NEWS SCOPE COVER STORY Rockway Precast, Marks Metal provide water bottle solution PHOTO: Dapper Cos.

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