... welded H-section in order to do primary and secondary beam,onsite assembled by balts or welding ... construction cycle,adaptable,attractive appearance,low cost and easy to maintain,etc.,have been widely ... in factories,ware-houses,exhibition halls,supermarkets and other construction.Low-level system is a ... , snow load, etc. 4. Insulation material: Sandwich panel or steel sheet. 5. Crane beam: Do you ...