NACELLE LIFTING METHOD, NACELLE LIFTING MECHANISM, TOWER, AND WIND POWER GENERATION DEVICE

A method of lifting a nacelle installed on a tower is provided. The method includes attaching a tapered bushing mechanism to a through-hole provided for a member of the tower; attaching a push-up bolt to the tapered bushing mechanism; and raising the push-up bolt while pushing the push-up bolt against a first member provided for the nacelle. The tapered bushing mechanism includes a tapered bushing inner cylinder and a tapered bushing outer cylinder. The tapered bushing inner cylinder includes a first taper section whose outer diameter becomes larger toward an end of the tapered bushing inner cylinder and a first screw thread formed on an inner surface of the tapered bushing inner cylinder. The tapered bushing outer cylinder includes a second taper section whose inner diameter becomes smaller toward an end of the tapered bushing outer cylinder. The attaching of the tapered bushing mechanism to the through-hole includes: inserting the tapered bushing mechanism in the through-hole such that the end of the tapered bushing inner cylinder is positioned on an up side the end of the tapered bushing outer cylinder is positioned on a down side, an outer circumferential surface of the first taper section and an inner surface of the second taper section contact, and an outer circumferential surface of the tapered bushing outer cylinder contacts the through-hole; and pulling down the tapered bushing inner cylinder in a state that the tapered bushing mechanism has been inserted in the through-hole. The raising the push-up bolt includes turning the push-up bolt in a state that the push-up bolt has been engaged with the first screw thread.