All pallet rack columns should be anchored, or secured, to the floor with bolts, according to RMI’s ANSI MH16.1: Design, Testing and Utilization of Industrial Steel Storage Racks. This includes both aisle columns and interior or rear columns on all frames. MH16.1 requires all columns to include a base plate (also sometimes called a foot plate). Further, anchored bolts must meet the design standards established in the same document.
The reason, quite simply, is so the racks don’t fall down. The base plate and the anchors are designed and engineered to resist forces experienced at the base of a columns. These include seismic forces caused by an earthquake, or impact forces caused by a forklift collision. Anchored racks are more likely to remain upright, ensuring the safety of any persons in the area.
Each rack manufacturer will configure a column base plate that best protects a unique rack installation. Sizes can range from as small as 3 x 5 x 0.25 inches with a single anchor, up to 12 x 12 x 0.5 inches for tall systems in seismic zones.
The rack manufacturer or professional engineer will provide details about the proper quantity, brand, and size of the anchor bolts needed. They will also specify how many holes within the base plate to use. Most base plates incorporate with extra holes for use as alternatives if concrete reinforcement interferes with drilling the floor.
To ensure that the installation conforms to the supervising engineer’s directions, take special care when anchoring near slab expansion joints and when replacing damaged anchors.
Looking for more details about anchoring? Additional information is in RMI’s Frequently Asked Questions.
