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The overall lifting of the large span structure means that the structure is assembled and formed on the ground as a whole, relying on the top of the vertical structure as the lifting bearing point, using the flexible steel strand as the lifting bearing cable, and using a special hydraulic jack as the power device to lift the lifting structure into place at high altitude.
Site flatness requirements. If full hall scaffolding is used, the site needs to be leveled; if the sliding operation frame is used, the site needs to be leveled, requiring full hardening of the site; if rigid support frames are used, the site needs to be leveled, requiring partial hardening of the site.
In order to meet the needs of modern social life and living environment, people need larger coverage spaces, such as large venues, gymnasiums, hangars, exhibition halls and waiting rooms.
Non-destructive testing in the process of application will not cause damage to the components, and can obtain accurate results. In the process of applying nondestructive testing, it can visually reflect the properties of the surface, interior and individual specimens of the components. With the development of large-span space building steel structure, nondestructive testing technology is widely used.
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