We were engaged to carry out a very complicated tandem lift to erect one unit of MHE Demag 90 Tons Overhead Gantry Crane at Amsteel II Banting Factory. Two (2) units of Liebherr LT1300 (300 Tons) Truck Cranes were supplied and used at the site.
The tandem lift was successfully carried out by us despite its complicated situation due to the height limitation and other obstructions as explained below :
First of all, the height from ground to the roof top was only 60 meter but the lifting height for the grab (64 metric tons) was 52.50 meter. The roof and trusses were not allowed to be opened by the client despite the space limitation. Therefore, it left a limited boom height of only 2.5 meter for our cranes boom clearance. To overcome this limitation, we extended our boom length to only 55 meter and the lifting lug was welded to suit the length of the slings in order to reduce the working height.
2) Secondly, our cranes’ booms had only 600 mm space clearance to the girder where we were required to cut the platform and open a hole on the left sides of the girder, and then on the right side of the girder, the crane boom had to position and work between the two (2) beams.
Despite such height limitation and space constraint, our experienced manpower and cranes still successfully carried out the lifting and work on time without any problem occurred. The detailed lifting procedure was simulated in our rigging drawings.