GUYED WIND TURBINE TOWERS WWW.RAMBOLL.COM

INNOVATIVE TOWER CONCEPT FOR LARGE HUB HEIGHTS

WWW.RAMBOLL.COM THE RAMBOLL PLATE INSERT ATTACHMENT TO TOWER GUYED WIND TURBINE TOWERS a) Final assembly, b) Von Mises stresses in Ultimate Limit State, c) Sideview with Ramboll has developed an innovative wind turbine tower concept to meet demand for coincidence of guy ropes lines, d) Segmentation for fabrication and large hub heights. The concept is based on more than 70 years of experience with the transport, e) Shear transfer in flange analysis, design and construction of towers and masts globally. contact surfaces and internal bolt, f) Top view of layout and guy rope coincidence.

Large hub heights transport restrictions Optimal foundations In today's wind market some projects • Lower consumption of steel for the Apart from optimisations of the tower require wind turbines with large hub structure itself, the concept also significantly heights to yield a viable return on the • Simple and small foundations reduces the costs of foundations, investment. The introduction of new • Same supply-chain as for the which are generally smaller than for a +4 MW onshore turbines also requires traditional steel towers self-supporting tower. The smaller larger hub heights. foundations and their general nature Ramboll has applied its +70 years of Supporting the tubular tower also facilitates the use of experience within mast and tower As the single added component to the prefabricated concrete elements as an design, along with its +30 years of standard tubular tower the alternative to in-situ cast foundations. involvement in the wind industry to attachment of the guy ropes to the At sites with bedrock, the concept develop a game-changer within tower has been engineered for benefits from direct anchoring of the towers for the construction of tall optimised production and logistics. guy ropes to the rock. wind turbines. Comprising six identical plate

elements, which are inserted between Independent due diligence Guyed wind turbine towers flanges of the standard tubular tower As an independent engineering, Initially conceived in 2003, the sections, the attachment is both lean design and management consultancy, Ramboll-developed tower concept and simple to manufacture and with Ramboll can ensure the best complete strengthens the traditional steel excellent fatigue behaviour. The plate balance of plant, without any conflict The higher the better - tubular tower by introducing guy insert is provided with a bend and of interest. Ramboll's Guyed Wind ropes (stays), attached to the tower holes to attach cast socket Ramboll performs cost benchmarks Turbine Tower concept can just below the rotor of the turbine. terminations of the guy rope. The and technical due diligence including be extended to very high hub This means that taller towers can be choice of having two guys in each of risk profile against other tower constructed with a smaller cross- heights and still be cost the three directions is partly to have a technologies, such as traditional section than for the traditional tower effective. Combined with the redundancy should a guy rupture tubular steel, concrete/steel hybrid or concepts. the installation concepts occur, partly to have the guys in more lattice steel towers, without conflict of Advantages include: manageable sizes. interest. used for telecommunications • Tower sections well within onshore masts, hub heights of more than 200 metres are not a problem.

RAMBOLL IS THE GLOBAL LEADER WITHIN DESIGN AND CONSTRUCTION OF NEW SITES MAY BE OF INTEREST FOR GUYED MASTS POWER GENERATION AND Ramboll has +70 years of experience with REPOWERING the design of foundations for guyed masts With the Guyed Wind Turbine Tower for broadcast and telecommunications. concept large hub heights can be This experience has been transferred to constructed cost effectively and therefore our Guyed Wind Turbine Tower concept. more sites can be viable, e.g. forrests in More than 30% cost saving has been the highlands in the Nordics or similar Wskpogf constodofon determined for project scenarios locations. Repowering of small turbine doluptatquis etus, optatene eossus res compared to alternative tower concepts. sites with power upgrade is possible audaesecum qui reiur aut lab imporis. owing to the small foundations required.