... work cycle design, can doulbe shorten the construction time: Completing 800 m2 of construction just in one day; 4. Low cost ... arched roof does not need water and maintenance, which can be used for more than 50 years; 6. Perfect design: Construction ... , sports venues, workshops, railway stations, the extension project, and roof construction, etc. Needing more steel structure products, pls contact us at ...