This invention relates to an apparatus for drawing up and winding up booms, preferably so-called self-expanding booms, provided with an upper floating body portion and a lower skirt portion, which comprises a plate arranged on a platform, which plate is rotatable by means of a motor unit, and which is provided with a winding up means positioned essentially vertically and essentially at the middle of the plate, and a means for feeding in the boom, the platform and the motor unit being designed in that way that the later one can be plugged into and out of the platform, and the plate being designed in that way that it can be driven by means of a gear pinion which is arranged in the motor unit and goes into engagement with the plate when plugging the motor unit into the platform.
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