BRIDGES Ӏ SECTOR SNAPSHOT
Mega Jack system. Once on the Mega Jack, teams jacked each of the bridge sections to a height of 14-16 cassettes. The sections were then positioned using tugboats and winches before being lowered into place onto their columns. Both the East and West bridge sections had the added step of being slid into place using Mammoet’s
slide track systems. Use of the Mega Jack allowed for
greater speed in raising the bridge sections to the necessary height and the skid systems allowed for precise placement of the bridge sections into final position. The quick operation of the Mega Jack allowed for better management of setting windows due to
the large tidal differences. Sidney King, Mammoet’s project
manager for the Portal North Bridge project, said “The bridge section’s relocation and successful loading onto the barge demanded careful planning and close coordination with Skanska and Carver, and we’re proud to report a seamless operation.”
PEDAL POWER: BIKE BRIDGE OVER ROAD
Heavy lift and transport specialist Sarens recently placed a 240-tonne cycling and pedestrian bridge over a busy ring road in Hasselt, Belgium. The bridge was first transported
from its site of manufacture to a nearby quay using two sets of SPMTs fitted with turntables. There, it was transferred onto a barge with the help of a Liebherr LTM 1650-8.1 eight-axle mobile crane in the 700t class, and Sarens’ Demag AC700, which is also a 700t crane, but here it was configured as a 500-tonne crane due to scheduling constraints.
34 CRANES TODAY Once the bridge arrived in Hasselt
by water the Sarens team quickly mobilised. Cranes were set up along the quay and SPMTs prepared for the next stage. A three-crane triple lift was used to unload the bridge from the barge. A 500-tonne class Liebherr LTM 1500- 8.1 all terrain and two Demag AC700 all terrains were used. The LTM and one of the AC700s first lifted one side of the bridge together, using a triangle to bring it closer. When the AC700 was able to bear the 145-tonne load alone, the 500-tonne crane was unhooked and
the bridge was slewed between the two remaining cranes. At the opposite end of the structure the second AC700 helped guide the bridge into final position onto the SPMTs.
The final move took place during the
early hours of a Sunday morning. At 2am Sarens rolled the cranes, trucks, and bridge to position. At sunrise it lifted the bridge above the ring road. By midday, the cranes had been demobilised and the bridge was securely positioned — marking the successful completion of a highly coordinated, high-stakes operation.
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