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post are spliced at approximately mid-height with a bolted
connection, and each rack post is anchored to the floor of the
Reserve Facility with anchor bolts. The front and back vertical
rack posts are connected by L-shaped steel angles, which were
welded to the rack posts prior to being delivered to the site.
Diagonal angles welded between the two posts in an X-pattern
prior to shipping create a rigid truss that provides lateral
stability to the racks in the east-west direction.
The rack posts in each row are connected by horizontal
beams, which span the 10-foot 2-inch distance between rack posts
and also support the rack shelves and the roof deck. A typical
shelf beam is 3 inches deep and 30 feet 6 inches long and
connects to three rack posts. The shelf beams are connected to
the rack posts with high strength steel bolts, creating a rigid
connection that maintains a 90-degree angle between the rack
posts and the beams and provides lateral stability to the racks
in the north-south direction. While most of the rack shelves
consist of wire mesh installed over the shelf beams, the bottom
shelf consists of plywood with a metal skirt.
Petitioner's employees reach the rack shelves by using
transtackers, which are customized vehicles that carry an
operator and a load of merchandise at horizontal speeds up to 6.5
miles per hour both up and down the aisles and at vertical speeds
up to 60 feet per minute from the bottom to the top of the
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Last modified: May 25, 2011