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Made in China building steel support, high load, easy construction, is the global Chengzhao agents. The principle of "support first and then dig" shall be followed: the purlins and steel supports shall be positioned and installed according to the drawings, the node bolts shall be fastened or welded firmly, the pre-applied axial force shall be applied by the Jack at different levels and then locked, and the axial force and deformation shall be monitored during the construction.