Analysis on the Method of Length Calculating for Flexible Hoisting Extra Large Solder Ball Grid Roof

The flexible overall hoisting technique is put forward for the construction of the 30000m2 COMAC roof which is made of solder ball grid structure. It is critical to study how to properly measure the four ropes length of each lifting point. Language tools use in AUTOCAD AUTOLISP appropriate programming has been an efficient tool to correctly output the length of the rope. This method can provide some experiences to the construction and fabrication of the steel member of the project.