Wind-turbine rotor-blade hoisting apparatus, method for attaching wind-turbine rotor blade, and method for constructing wind power generator

A method for attaching a wind-turbine rotor blade comprising:

• a preparation step in which the wind-turbine rotor-blade hoisting apparatus comprising:
• a sheave that guides a hoisting wire from a rotor head, to which a wind-turbine rotor blade is to be attached, toward the wind-turbine rotor blade and that is arranged so as to be movable in a direction along a rotation axis of the rotor head;
• a retaining portion that retains an attaching end of the wind-turbine rotor blade such that a line connecting the center of gravity of the wind-turbine rotor blade and a connecting portion, to which the hoisting wire is connected, crosses a longitudinal axis of the wind-turbine rotor blade;
• and
• a winch that is disposed in the rotor head, in a nacelle to which the rotor head is attached, or on the ground and that draws the hoisting wire to wind up or let out the retaining portion,
• wherein the retaining portion includes an inclined portion that is inclined toward the attaching end and extends from the connecting portion disposed radially outside of the wind-turbine rotor blade toward the wind-turbine rotor blade, and a retaining sling that extends from the connecting portion and is wound around the outer peripheral surface of the wind-turbine rotor blade, is attached to a wind-turbine rotor blade disposed on the ground and a rotor head disposed on a tower and in which a hoisting auxiliary bracket is attached to a tip of the wind-turbine rotor blade;
• a lifting step in which the hoisting wire attached to the retaining portion and a hoisting auxiliary wire attached to the hoisting auxiliary bracket are pulled to lift the wind-turbine rotor blade in the same orientation as it is on the ground;
• a rotating step in which the wind-turbine rotor blade is further pulled by the hoisting apparatus to rotate the orientation of the wind-turbine rotor blade;
• and
• an attaching step in which the wind-turbine rotor blade is attached to the rotor head,
• in the lifting step, the retaining portion supports the wind-turbine rotor blade at a fixed point between the inclined portion and the wind-turbine rotor blade, and at a contact point between the retaining sling and the wind-turbine rotor blade arranged with an interval in a longitudinal direction of the wind-turbine rotor blade.

A wind-turbine rotor-blade hoisting apparatus comprising:

• a sheave that guides a hoisting wire from a rotor head, to which a wind-turbine rotor blade is to be attached, toward the wind-turbine rotor blade and that is arranged so as to be movable in a direction along a rotation axis of the rotor head;
• a retaining portion that retains an attaching end of the wind-turbine rotor blade such that a line connecting the center of gravity of the wind-turbine rotor blade and a connecting portion, to which the hoisting wire is connected, crosses a longitudinal axis of the wind-turbine rotor blade;
• and
• a winch that is disposed in the rotor head, in a nacelle to which the rotor head is attached, or on the ground and that draws the hoisting wire to wind up or let out the retaining portion,
• wherein the retaining portion includes a frame to be attached to the inside of an opening provided in the attaching end of the wind-turbine rotor blade, and
• wherein the frame includes the connecting portion.