For small single-storey buildings where the weight of the crane or crane does not exceed 5 tons and the span is less than 15m and the column elevation is not more than 7.5m, brick and concrete columns and reinforced concrete roof beams or roof tiles can be used. The plant has little use; when the crane from the weight of more than 150 tons, the span is greater than 36m, should be used steel column, steel roof truss light steel roof structure, this plant light weight, span, short construction period, but higher cost , Is widely used in large span or heavy plant. In addition to the above two cases, most of the single-storey building, you can use concrete columns, steel roof truss (roof beam) light steel roof structure. This type of structure has a large span of steel structure, the advantages of short construction period, the cost is lower than the whole steel structure. For the trolley tonnage of not more than 20 tons of light, intermediate work system of single-storey factory, to change the traditional reinforced concrete columns, steel roof truss (roof beam) load-bearing structure of the framework for the door frame system, can save steel, reduce costs , To speed up the design of the installation progress.
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