| 摘要 |
An object of the invention is to ensure that a crane can be used in connection with a windmill without this considerably affecting the price of the mill. Another object is to provide a method whereby a crane may be placed temporarily on a windmill quickly, easily and effectively. The novelty of the method is that the windmill comprises at least a permanently mounted assembly crane which is used for hoisting and mounting a separate service crane, and that the service crane is temporarily secured for operation on a foundation in or at the nacelle. The advantage is that the permanently mounted assembly crane need only be so strong that it can hoist the separate service crane into position for operation, while the service crane may be of such a strong structure as is deemed necessary vowing to occurring tasks, and the service crane cost may be distributed on a large number of windmills which may use the same service crane in succession. An other advantage is that the service crane may be placed in position quickly and easily by just one lifting operation. Still a further advantage is that even with a strong structure the service crane is only of such a size as will allow it to be transported by an ordinary truck or on an ordinary ship in case of offshore windmills. |
