
Completing a Circular Concrete Pour with a Roller Screed
The Lightning Strike roller screed from Lura Enterprises is presented as an efficient solution for screeding circular concrete pours. Northern Grain Equipment, based in West Fargo, N.D., utilizes this roller screed in its concrete division, which specializes in providing comprehensive grain system services, including the pouring of circular grain bin floors. These floors are crucial for grain drying and storage, with typical diameters around 48 feet, though larger projects, such as a recent 75-foot diameter floor, are also undertaken.
The preparation process for a circular grain bin floor begins with thoroughly compacting the fill to at least 100 percent to prevent any future cracking of the concrete floor. If the grain bin is intended for drying purposes, an aeration system is installed beneath the floor to facilitate air circulation through the grain. Following the installation of the aeration system, rebar is meticulously placed to reinforce the concrete floor. In cases where a conveyor system is present underneath the bin for grain transport, steel decking is positioned over the rebar to prevent concrete from collapsing into the conveyor tunnel during the pouring process. A second layer of rebar is then added over the steel decking to further enhance structural integrity.
Once all preparatory steps are completed and the rebar is in place, the concrete is poured. Screeding commences immediately after the pour. According to Justin Schmidt, a Foreman at Northern Grain Equipment, the Lightning Strike roller screed significantly streamlines this process. He highlights its versatility and lightweight design as key advantages, making it particularly suitable for their specific needs. The use of this screed not only improves efficiency but also reduces the labor required and cuts the screeding time by more than half.
For circular slabs, the screed's operation is straightforward. A base plate is embedded in the floor before the concrete pour. The Lightning Strike screed is then attached to a shaft inserted into this base plate, and a center pin secures the screed, enabling a single operator to perform circular screeding. Upon completion, the screed, pin, and shaft are removed, and the small void created is filled with concrete, while the base plate remains permanently embedded beneath the floor.
For larger pours, a different approach is employed where two operators work the screed, one on each side, executing multiple straight-section pulls instead of using the center pin for circular motion. This method is preferred for larger bins to ensure more efficient finishing and prevent cold joints in the concrete. Schmidt notes that extending the aluminum screed beyond 26 feet could lead to slight flexing, which also justifies the straight-pull technique for larger areas. The straight pulls inevitably create odd, pie-shaped sections at the edges of the circular slab, which are subsequently finished by hand using a traditional 2 x 4 screed board. The final finish on the floor is achieved using walk-behind power trowels, resulting in an even and smooth surface.
Northern Grain Equipment possesses three Lightning Strike roller screeds, two gas-powered and one electric, underscoring their reliance on the equipment. The agricultural construction market in their region is experiencing a boom, with the company anticipating a doubling of sales in the coming year, indicating continued high demand for their services and the effective use of their specialized screeding equipment.
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