标高控制、垂直控制、纵横轴线定位三步法安装钢立柱
표고공제、수직공제、종횡축선정위삼보법안장강립주
Erect the Steel Vertical Column by Employing a "Three-Step-Method"of Location-Leveling Controlo,Vertical Control and Longitudial & Trasversal Axial Line