... , can doulbe shorten the construction time: completing 800 m2 of construction just in one day;4. Low ... more than 50 years;6. Perfect design: Construction arch span is up to 70 m, ... ;8. The scope of applications: Widely applicable in kinds of industrial plants, shopping malls, exhibition ... , railway stations, the extension project, and roof construction, etc. Needing more steel structure products, pls ...