The object of the present invention is to provide an apparatus and an associated method for attaching a cofferdam system as monopile Maintenance Unit (MMU) to monopile of offshore structures for the purpose of maintenance of the monopile foundation.; The complete device consists of a self-propelled jack-up barge (1), a hydraulic erecting (2) with two guide rails (5) and a hinge system (6) for the lifting of the cofferdam system (3), wherein the guide rails (5 ) and the hinge system (6) (on a displaceable platform 14) are arranged and the actual cofferdam system (3) as a monopile Maintenance Unit (MMU) (3) and various connecting elements (4) such. is formed as a gangway (4), supply lines (4) and discharge lines (4) between jack-up barge (1) and MMU (3).
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