| 摘要 |
A folding mast, e.g. for a wind turbine, comprises lower 1, middle 2 and upper 3 mast sections connected by respective hinged joints 6. The upper section is also connected to the lower by a rigid link 11 which controls the alignment of a longitudinal axes of the upper and lower sections in a parallelogram linkage so that the upper section is always vertical. The link is connected to the sections via gussets and bearing pins 9, 10 and movement effected by an actuator or winch. The mast sections each terminate in a flange which may be bolted or clamped following erection for strength. The link and actuator may be removed for use on subsequent masts. A second set of cable stays may secure the upper section by engaging tangentially with a torque reaction ring on e.g. a vertical axis turbine. The apparatus may be used in a method of erecting a folding mast comprising staying a first mast section 1 before a second mast section 2 is raised into position on top of the first. |
