Tapered rafters, cold-formed secondary framing, bolted site connections. It is the fastest way to put a large dry volume over a flat site — as long as the building really is the shape the frame assumes.
A pre-engineered order is not a pile of steel. It is a drawing set, a packing plan and a sequence, and the steel is the last of the three to be finished.
The frame is sized to your span, your crane, the loads you will hang on it and the wind where it stands — taken from the site record or your local code, never from a national average.
Plates cut on a CNC line, H-sections welded and straightened, holes punched before painting. Tapered members are cut to the model's length, not to a rounded-up stock length.
Shot blast and a primer system, or hot-dip galvanising where the environment calls for it — decided with you from the site, not from a standard line in a catalogue.
Members nest in the order they are needed, marked to match the erection drawing, and planned against the container before the last bolt is boxed. Loading is a drawing, not a judgement.
Erection drawings, a lifting sequence and temporary bracing shown where it is needed. One engineer follows the file from the first drawing to the last delivery, so the person answering the phone already knows your building.
A tapered frame is efficient inside its own logic. Push past it and the price rises faster than the steel. These are the six points where we say so.
Past a certain width, one intermediate column or a truss is cheaper than a deeper rafter. The number is different for every loading, and it is worth asking before the layout is frozen.
Light duty lives happily on a tapered column. Heavy duty, high hook height and a long runway turn the column into a different member, and the building into a different budget.
Two storeys, an office block over the plant, a mezzanine carrying racking: that is a structural frame, detailed and checked member by member.
Silos, suspended conveyors, overhead cranes on a curved runway, heavy rooftop plant. Each one has to be in the model before the frame is sized, not bolted on afterwards.
A future bay, a future crane, a future floor. Reserving capacity in the first frame costs a little now and saves a rebuild later — but only if it is designed in.
Many destinations require a locally registered engineer to stamp the design. We detail and supply to the drawings that engineer approves, and we say so early rather than at the port.
Span, eave height, crane and the site. That is enough for a first answer, and the answer will tell you whether a tapered frame is the right purchase.
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HONGJI SHUNDA