Another type of steel deck is the open grid steel decking which is a rolled and punched c- channel shape bolted together to form a rigid perforated deck. Due to the shape of the steel decking profile, it is possible to span the joists further apart than when using the checker plate decking. This in turn allows you to save on the use of joists thereby reducing the overall cost. The joist spacing also depends on the carrying capacity. This steel open deck system is useful when using a sprinkler system for fire proofing in your building as only one level of sprinklers are necessary as the water will be able to run through the steel open grid deck to the area below. It also eliminates the need for extra lighting as the same applies. This type of steel decking can be galvanized or epoxy coated.
Steel floor construction
The main supporting structure of the steel mezzanine floor construction consists entirely out of steel components. The columns are generally either square tube sections or H-beams which has a base plate, for fixing to the existing concrete floor, and top plate for fixing to the main bearer beams. In some cases it is possible to fix the mezzanine structure directly to the structure of the building by either attaching to the existing steel columns or the walls of the building.
This generally allows you to eliminate a few extra columns. The main bearer beams are generally steel universal or I-beams which come in various sizes depending on the span and carrying capacity. These bearer beams can also be custom designed girders if the span of the beam is very large. The steel joists are either welded or bolted to the main beams and can be lip channel or I-beams. The span and carrying capacity of the joists will determine its size and the thickness of the decking will determine the centres of the joists. The steel decking is then screwed to the joists.
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