With the growing vogue of crossdocking and its emphasis on shorter cycling time for inventory, Dc floors must be durable enough to be able to withstand the faithful abuse of 24-hour traffic. In today's throughput logistics, especially in the case of Dc's, the floor profile must also play an integral part. The emphasis on endurance and its ease in integral premise stems from the fact that an imperfect floor, that being one which is not flat enough will constantly impair the Dc from giving its peak and optimum performance.
The importance of flat floors are emphasized in the way that unavoidable truck manufacturers do not issue warranty's to new lift trucks, unless unavoidable specifications about floor flatness is met. The conjecture for this is that most lift trucks lack a suspension ideas or pneumatic tires, which help in the absorption of shock caused by road bumps. Lacking this feature, warranty costs will therefore be higher if the truck is qualified with an inferior floor. The slightest variance of height in a floor, so much as 1/116th of an inch in fact, can cause wheels to lift up the pavement when the truck is running at full speed. This invariably results to immoderate strain on the unit itself. Prolonged stress on the unit will of course lead to its failure, which does not pose well for either the operator or the contributors. Aside from time and money being wasted for repairs, these wee failures can pose perilous risks for the operators, resulting in possible injuries and damage to the unit.
Rack Rails
Due to the necessity of having a level floor, contractors use three measurements to gauge the flatness of a floor:
The first is 'face flatness' or bumpiness metric, abbreviated to Ff. This measures the curve of a floor extending over two feel. This indicates how smoothly a car will travel over a floor.
The second metric is 'face levelness' or the pitch or tilt of the slab. This measures the elevation incompatibility over floors ten feet in length. This is used as an indicator of how well tall storage racks will rest on the floor.
The third metric is known as Fmin, and is used to quantum the concrete levelness of a specified aisle in applications inspiring super-flat floors which are supported by wires or rail guidance, such as those used for defined traffic.
The specifications that should be met in today's Dc's are linked in the following metrics:
For random traffic in accepted Dc applications, a Ff35/Fl25 is a Good metric. This can be used well in lift trucks which carry pallet storage applications.
For high throughput Dc's, such as those in the receiving or shipping area, a Ff45/Fl35, being a Flat floor metric, is best. Crossdocking Dc's and Agv's are the most common receptors of this application.
In the case of Dc's that are very high in performance, such as those which undergo traffic patterns that are random, a reading of Ff65/Fl40 (which is already a very flat determination for a floor) is used. It works best with High Bay or order picking Dcs.
There is also the Vna or Very Narrow Aisle application, best qualified for high bay ones. They consist of six or more pallets, measured as Fmin50* or Fmin100; these being Super Flat floors used for high speed operations inspiring Turret Trucks.
Most 'Spec' facilities nowadays build floors that have 6" of fiber mesh reinforcement, as much as 4,000psi. Ff35/Fl25 concrete floors are a common example, used often for basic logistics and storage applications. For those needing a high throughput however, the Ff45/Fl35 is a good option, because, despite its priciness, the presence of this flatter floor will lower maintenance costs for the truck by improving its doing as well as reducing mishaps that come out of faulty floor installations. It is advised that such an application be used especially in the case of crossdocking.
For Dcs with high ceilings, such as those capable of pallet storage extending to 6 or more pallets, the Very Flat floor option, Ff65/Fl40 will allow for maximum retrieval and put away, resulting in optimized performance. Such level operations are vital especially in cases inspiring order picking applications, where even the slightest variations on floor flatness can encumber operators by forcing them to have the load lowered down so that the mast sway will be reduced when inspiring into separate locations. This wastes time and impedes their efficiency. A Very Flat floor should furnish an suitable Roi, depending on the level of activity, when compared to either a Good or Flat floor.
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