Brock Introduces M-Series™ Line of Million-Bushel Capacity Grain Bins With Free-Span Roof Structure and SMOOTHCORR™ Sidewall System
MILFORD, Indiana, U.S.A. — Brock Grain Systems has introduced its M-Series™ line of commercial grain storage bins featuring single bin capacities over a million bushels. The largest of the new BROCK® M-Series™ Bin models is 156 feet (47.5 m) in diameter with a free-span roof, a SMOOTHCORR™ Sidewall System and a storage capacity of 1.34 million bushels of grain.
The new M-Series™ line of BROCK bins is available in two diameters. The 132-foot (40.2 m) diameter bin models offer single bin capacities ranging from 700,000 to 1.18 million bushels with a 40,000-pound (18,150-kg) roof peak load, while the 156-foot diameter M-Series™ models have a storage range from 1.0 to 1.34 million bushels with a 50,000-pound (22,700-kg) roof peak load. Additionally, the new Brock roof was engineered to handle temperature cables and ground snow loads up to 50 pounds per square foot while still maintaining the stated peak loads. In fact, the roof structure incorporates convenient temperature cable hangers built into the rafter system.
The 132-foot diameter M-Series™ Bins have a maximum eave height of 34 rings or 91 feet (27.7 m) and an overall height of 126.5 feet (38.6 m). The maximum eave height for the 156-foot diameter model is 26 rings or 70 feet (21.3 m) and an overall height of 112 feet (34.1 m).
In designing the new M-Series™ Bins, Brock’s 50-plus years of experience guided the development of a number of innovations. These include the M-Series™ Bins’ free-span roof structure plus other unique features, such as Brock’s new structurally superior SMOOTHCORR Sidewalls, which have a smooth interior coupled with a corrugated exterior surface. The bins also feature Brock’s FULL SWEEP® Bin Anchoring System that enables the use of a single-pass bin sweep system for getting grain safely out of the bin without the need for a front-end loader.
Early in the M-Series™ Bin design process, Brock chose to develop a free-span roof that did not need to rely on center support towers. The bins’ roof peak load capacity supports the larger 40,000- and 50,000-bushel-per-hour conveyors needed for the higher grain flow rates the larger bins use without requiring extra reinforcement. Brock’s engineers designed the rafters, purlins and their connections to better handle the rigors of high peak-load demands coupled with snow and temperature cable loading. The special rafter and purlin connections unite the roof structure in a way that more fully develops the strength of the roof to resist bending and to more efficiently handle unbalanced snow loads.
The tops of the M-Series™ Bins feature Brock’s standard 12-foot (3.7 m) diameter flat-top roof work platform area. The work platform is surrounded by a 42-inch (1067-mm) tall guard rail. The roof fill hole will accept spouting up to 48 inches (1220 mm) in diameter.
Another unique Brock feature for this family of larger bins is the SMOOTHCORR Bin Sidewall design. The outside of the sidewall body sheets features the typical narrow-corrugation bin sidewall. However, instead of laminating or overlaying corrugated body sheets with one or two more corrugated body sheets as others have done, with the SMOOTHCORR Sidewall System, Brock has bolted a smooth-wall body sheet to the inside of the sidewall. The company has a patent pending on the SMOOTHCORR Wall design.
Brock’s exclusive SMOOTHCORR Sidewall construction approach provides a stronger overall body sheet with excellent wind resistance. The smooth inner sidewall surface allows grain to more easily flow down and out of the bin, reducing load stresses on the bin’s sidewall, stiffeners and footer. The air trapped in the corrugations between the two body sheets contributes insulation value to the sidewall which can help preserve grain quality.
The paired approach to the SMOOTHCORR Sidewall construction also permits Brock to interlace the overlapping body sheets for superior strength connections and load transfers from the body sheets to the sidewall stiffeners.
Why develop larger grain storage bins?
“The grain industry is moving toward larger storage bins as a method for controlling and reducing facility costs and storage losses,” notes Jim Barnes, Sales Manager for Brock Grain Systems.
As an example, Barnes points out that one M-Series™ 156-foot diameter bin holds nearly as much grain as two 105-foot (32-m) diameter tanks. However, instead of using double the handling equipment, such as the conveyors and bin sweeps required with two 105-foot bins, the 156-foot diameter M-Series™ Bin uses a single handling system. As a result, grain facilities save money on the cost and operation of the accessory equipment needed for storage.
“Having the ability to aerate the grain and manage it with a real-time temperature detection system offers a grain facility a big advantage over piling grain on the ground at harvest time. This is especially important as we see trends for large producers getting into the fields sooner and harvesting grain at higher moisture content to maximize yields,” Barnes adds. “Using the larger bins helps elevators to avoid grain spoilage with ground piles. And, the M-Series™ Bins eliminate the labor intensive clean-up requirements and the expense of tarps that accompany temporary ground storage.”