GANTRY CRANES | APPLICATION REPORT
P The goliath crane at Rosyth shipyard installing the forward island on aircraft carrier HMS Queen Elizabeth. Credit: Wikimedia, ChrisPAD34e
Inside a building you might find that that is an issue: your approaches might not be as good on long travel near the end walls. But you have gained floor space elsewhere. It is a case of working out where you want to gain and where you can afford to lose. “Outdoors, those end-of-run constraints are not so important. “And of course, indoors or out, these cranes can deliver to anywhere within their rectangle footprint,” adds Neill. The forces and stresses in a gantry
crane are reasonably straightforward - except at two points: at each end of the beam where legs and beam meet. “That is a critical point in the design,” says Neill. “That connection has got to be exactly right or else the structure just doesn’t work. So that is where we concentrate our design effort.” At which point the similarities with an overhead crane re- enter: “We have developed our own set of calculations spreadsheets. We have those for overhead cranes as well; but since I’ve been at Street Crane we have designed what I call the Goliath add-on, where we can take an overhead crane design and
start adding in what would be required if we want it to be a Goliath structure. On top of that we use structural analysis software as well, so if we have got a big special Goliath structure we can model that within the software and see where all the maximum stress points are and look at them under the worst possible load cases. So we can design an efficient and economical structure that way. We’ve got
some pretty powerful tools to allow us to get some very good designs.” We mentioned the semi-Goliath earlier.
Neill is a fan of the design. It offers, he says, the best of both worlds. It works both indoors and out and is ideal in the not- uncommon situation where an assembly building has a storage yard running along one side of it. “You take advantage of the building structure to support one end of
KONECRANES GOLIATH AT ST NAZAIRE
Chantiers de l’Atlantique in St Nazaire, France, is one of the great shipyards of the world. It constructed the Queen Mary 2 for Cunard and, going further back, the legendary SS Normandie, which entered into service in 1935. It is currently erecting a new giant Goliath crane from Konecranes, which is due to enter service this spring. The crane will have a lifting capacity of 1,050
tons, a rail-span of 130m and a height of 81m under the main girder. It has been manufactured in Europe by Konecranes in its entirety. Heavy lift operations on the crane started in the summer of 2021; assembly onsite and the erection work have been done in cooperation between the shipyard and Konecranes. Chantiers de l’Atlantique is renowned for its expertise and craftsmanship in
building large passenger cruise ships and naval vessels. When in service the crane will handle large ship blocks and panels over the dry dock and play a role in ship assembly. The shipyard is currently building a series of cruise ships including Oasis Class and Edge Class ships for the Royal Caribbean Line and Meraviglia ships for MSC Cruises. Bertrand Paquet, VP purchasing, Chantiers de l’Atlantique, said: “This order placed with Konecranes is part of an ambitious investment plan for the shipyard. With a height 10 metres higher than the other gantry crane of the yard, the Goliath crane will allow us to lift and install all of the superstructure parts of the large vessels we will build in the coming years.” “When it enters service, this Goliath
crane will do the heavy lifting that Chantiers needs with great precision and reliability,” said Lasse Merenheimo, Konecranes’ director of Shipyard Cranes. “We are proud that Konecranes will help Chantiers to build beautiful, ultra-modern ships for many years to come.”
32 | March 2022 |
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