MIC Corporation, Japan’s largest crane rental company, has put its two new flagship 1250 USton (1134 tonne) capacity Demag CC8800s straight to work on the construction of a new highway around the city of Nagoya. The two massive machines, which have been allocated serial numbers 7 and 8, were delivered directly to the site in September and completed their first major lift in early November.
After closing off the old section of the highway for a night time lift, a huge 700 tonne complete bridge section was lifted into place to connect the old and new lanes of the highway. Initially, both cranes, configured with 66 metres of main boom with Sideways Superlift and the serial number 7 unit rigged with 440 tonnes of counterweight on the carrier and the serial number 8 unit configured with 540 tonnes of counterweight on the carrier, lifted the bridge 15 meters into the air. Both cranes then had travel 10 metres to reach the final position and set the load down.
The lift was made even more complex by limited rigging space and soft ground conditions which the rigging crew overcame by covering the entire area with steel plates to keep the pad loads within the permitted load limits. The lift was completed successfully within the allocated seven and a half hour time period, in time for traffic to hit the highway again at 5:30 am the following morning.
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