Awarded to commission and provide solutions for lifting of various complex structures constructed at ground level weighing between 100 to 160T and spanning between 2000M2 to 3500M2. The major challenge was calculation of lifting points and weight distribution on the multiple cranes used and thus proposing suitable equipment at each position.
We calculated load distributions at various lifting points and planned selection of appropriate cranes for use. A combination of 4 Liebherr mobile cranes were used; 2 x 250T, 400T and 500T with main boom and luffing-jib that successfully lifted the structures. Numerous site visits were done to carry out technical assessments and structural calculations for a custom designed and successfully engineered solution.
Lifting of 8 Girders of the Bridge to link Al Mariyah Island with Al Reem Island in Abu Dhabi. Major challenges were space constraints, limited crane set up area and access, large lifting radius and highest precision requirement for the job.
Girders were lifted into place by tandem operation using the largest mobile crane available in our fleet LTM-11200-9.1 (1200T) and LTM-1500-8.1 (500T). The 1200T crane was positioned at Al Mariyah Island and the 500T crane was positioned at Al Reem Island. Girders were delivered to Al Mariyah Island and were initially lifted using our single 1200T crane, swung across the island so that one end of the girder reached Al Reem Island. The Girder was then lowered on the ground and lifted onto final position on bridge pier by tandem operation using 2 cranes.
We were hired to provide a multi-crane lift solution due to the preference of construction of large structures at ground level and the requirement to lift the complete structure into final position. Major problems faced were the non-availability of lifting points and the irregular angled top surfaces.
A combination of 5 Liebherr mobile cranes was used; 400T mobile crane, 500T mobile crane and 1200T mobile crane with luffing-jib combinations for the main lift. Also 50T and 70T cranes with man baskets were used for aerial works. Rigging tackle design included choke hitched tie chains with suitable protection along with shackles to balance the irregular structure. Also the loads on each crane were monitored for respective uniformity based on our pre calculations.