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Goldhofer heavy-duty modules for an offshore viaduct

HeavyTorque

Goldhofer heavy-duty modules for an offshore viaduct

The Route du Littoral is a steep coastal road in the north of the island of La Réunion and the main link between the seaport of Le Port and the capital Saint Denis. The road is frequently closed due to rockfall, which often leads to closed lanes and major road works and even claims human lives. The authorities proposed a number of solutions to solve the problem before the decision was finally taken to build a new freeway called La Nouvelle Route du Littoral. The centerpiece of the project is an offshore viaduct with a length of 5,600 meters, which is being built to avoid the dangerous sections of the existing coastal road. In order to anchor the piers on the seabed, a floating construction platform complete with a huge crane is being used to lift the prefabricated foundation elements and position them on the seabed. The viaduct will have a total of 36 main piers and a supporting structure comprising 1,386 precast segments.

For transporting the main piers and the viaduct segments, the building consortium led by international construction and concessions company VINCI is using three split combination PST/SL 18 (P1+1/2) heavy-duty modules from the house of Goldhofer. Two factors were decisive for the choice: on the one hand the height and width of the cargo, which would normally call for two parallel modules, and on the other hand vehicle width restrictions en route. Goldhofer’s split combinations enable the width of the decks of the modules to be increased by 50 percent. That makes them the prefect solution: wide enough to take the 36 main piers weighing 700 tons each and narrow enough for the limits on overall vehicle width. Another relevant detail is the fact that the chosen combinations are self-propelled heavy-duty modules with hydrostatic drive equipped with two 490 hp PowerPacks. The vehicles need that kind of power in order to travel at high enough speeds. As the operation will last several months, the vehicles are fitted with fully enclosed cabs.

The main piers are transported over a distance of about one kilometer from the concrete plant to the port and there loaded onto the floating platform to be taken to the construction site. The 1,386 viaduct segments, each weighing between 210 and 285 tons are taken straight onto the viaduct. Transport operations are limited to the night hours, when there is much less traffic on the Route du Littoral. Two of the four lanes can then be closed, and the heavy-duty transporters carrying the viaduct segments can use the closed lanes to travel the 15 kilometers or so from the concrete plant onto the finished length of viaduct. At the end of the last completed deck section, the precast segments are picked up using a launching gantry and lowered into place. According to the construction schedule, 1,386 journeys are to be made over a three-year period for the viaduct segments alone. That is a real challenge for the three PST/SL 18s, one that will yet again demonstrate the reliability and quality of Goldhofer’s heavy-duty modules in daily use.

Go to https://www.youtube.com/watch?v=A8clWLLy6PY for a video that will give you an idea of the sheer size of this exceptional project.

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