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Colby avoids the use of down-aisle bracing at the rear of rack frames whenever possible, preferring instead to opt for the use of “standard” racking uprights and beams, increasing in size as necessary to accommodate the seismic loads.
Colby also uses chemical anchors and special seismic baseplates, designed to behave in a predictable manner in the presence of uplift forces, along with heavy-duty cross bracing, super-strong 4-tang beam connectors, and a full range of rack damage protection designed to eliminate day-to-day damage which can weaken the structure.
While some rack suppliers make use of vertical and horizontal bracing to stabilise the rack in the longitudinal direction, this can be problematic since the bracing is prone to damage when putting away and retrieving pallets, possibly reducing its effectiveness under load.
Following the 7.1 magnitude earthquake which struck Christchurch on September 4, 2010, and the thousands of subsequent aftershocks, the New Zealand logistics industry began rethinking their storage approach.
When an earthquake occurs, ground acceleration can increase the horizontal loadings on storage systems by a factor of 10 or more. Rack frames and beams respond by swaying to and fro, and the total mass within the racks – the stored pallets – begins to move in relation to the ground, creating inertial cross-aisle (transverse) and down-aisle (longitudinal) forces within the rack structure.
Countdown’s ColbyRACK stands up to aftershocks without dropping a box. Countdown’s ColbyRACK storage system, designed to cope with the extreme forces generated during seismic events
Read Case StudyIt is mandatory for all businesses to have their racking inspected at least once every 12 months, Colby can assist you with your regular “health” checks.
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