A heavy-duty barrier (1), which is movable, comprising a base part (2), which comprises a ballast (5), and a fence part (3) attached to the base part. The fence part comprises a fixed bar structure (6) and a rigid connection element (7), which is movably attached to the bar structure, and which is connectable with a corresponding connection element of a neighbouring heavy-duty barrier. The connection element comprises an attachment portion (16) movably attached to a bar portion (8) of the bar structure, and a hook portion (17) arranged to be engaged with a corresponding hook portion of another connection element.