Oversize loads require special trailers and transport modules. Continental air springs and hose systems are operational globally for transporting extreme loads.

Continental Canada Health
For the transport of wind turbines through the mountains of Western Canada, flatbed semitrailers with air springs from Continental are used. Photo: Goldhofer AG

The long flatbed is empty at the moment, but the concentration is clearly etched in the truck driver's face. He's negotiating a 1,100-km route from the Canadian coastal town of Stewart right across the green mountains of western Canada. The journey, via narrow mountain roads and over passes with extreme gradients, is part of the meticulous year-long planning for one of the region's most spectacular transport projects: turbines and rotor blades of this size have never before been transported through British Columbia, which is why the province's Transport Ministry demands a dummy run.

Following this thorough preparation, the actual transport – for which the local logistics company is using a number of Goldhofer air-sprung flatbed semitrailers – takes place a short time later. The company, based in the Bavarian town of Memmingen, is one of the world's largest suppliers of semi-trailers and heavy haulage modules that are often custom-manufactured for the particular job involved in transporting extremely heavy and/or long payloads. The flatbed semitrailer was lengthened using three extendable telescopic units to accommodate the 60-meter-long rotor blades.

Continental  Colombia  Mining
The bucket wheel excavator, which was moved in Colombia by two parallel heavy-duty combinations operated in parallel, weighs 1,200 tonnes. Each combination consists of three modules connected by Continental's hydraulic couplings and piping systems. Photo: Goldhofer AG

A long journey on air springs

"You can imagine the forces acting on the air springs, especially when transporting huge loads," says Hans-Jörg Reinecke, key account manager in the field of original-equipment air springs for commercial vehicles at Continental. After all, the European version of the flatbed semi-trailer can carry a maximum payload of 56 tons with up to 12 tons per axle.

Accordingly, axle manufacturers fitted their products with leaf springs for a long time, though, these are used rarely nowadays for semitrailers. Manufacturers such as Continental have long since developed effective alternatives. "Leaf springs also require more space and, therefore, increase the axle center distances, which can be an issue in the case of an oversize load convoy on narrow roads," says Reinecke.

Continental LaReunion
An 18-axle heavy-duty combination with three modules brought 700-tonnes bridge piers to its destination on La Réunion. The combination consists of three modules connected by hydraulic couplings and piping systems from Continental. Photo: Goldhofer AG
Another advantage of air springs is the ability to raise or lower individual axles, known as lift axles, of the semitrailer, which is a common practice in order to vary tire wear, axle pressure, and thus, road holding and fuel consumption. "Raising the lift axle reduces tire wear, while also mitigating the impact on the environment and costs," says Reinecke, citing one example of the benefits.

Tough hoses for heavy loads

Wind turbines and rotors are comparatively lightweight freight. When it comes to transporting large transformers, excavators or entire bridge sections, heavy-duty modules are required, which Goldhofer produces in every conceivable variation. Depending on the configuration of the modules into heavy-duty combinations, payloads ranging from 50 to more than 15,000 tons can be moved.

In Colombia, for example, two heavy-duty combinations, each comprising three modules, were operated in parallel with a total of 32 axles to move a 1,200-ton bucket wheel excavator. It took four days to cover the mountainous 32-km route, which included gradients of up to five percent. An 18-axle heavy-duty combination of the same type took to the road to transport 36 bridge piers, each weighing 700 tons, to their destination for the new coastal road on the island of La Réunion. A 1+1/2 system was used for the combination of three heavy-duty modules. That means that a half module was attached to each of two heavy-duty modules to make the flatbed wide enough.

Continental Transcor Acciona
This semi-trailer from the Goldhofer AG is especially suitable for the transport of wind turbine components. It is equipped with air springs from Continental. Photo: Goldhofer AG

"When selecting the axle combination, our customers focus primarily on the permissible axle loads, turning circles and ground pressures along the planned route to ensure the load arrives safely," says Rainer Auerbacher, senior vice president for sales in Goldhofer's Transport Technology division.

"The modules themselves are connected to each other using hydraulic couplings that Continental supplies for the type PST/SL together with the line system," adds Dieter Klüschen, key account manager. "The systems are already prefilled so that the air does not first have to be vented for fitting." And time is a valuable commodity.

Lifting & Specialized Transport — July - September 2018

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