Abstract: A chisel barge having an elongated hull floatable on a body of water with positioning means thereon maintaining the position of the hull in a generally fixed location while in a floating condition spaced from land. Bracket structure is provided on the hull, which bracket construction has an opening therethrough, the axis of which is inclined to the horizontal. Structure for pivotally supporting the bracket structure is provided on the hull to enable the bracket structure to pivot about a generally horizontal axis. An upstanding mast is mounted on the bracket structure and is tiltably movable therewith about the aforesaid generally horizontal axis. A chisel having a tool-like structure located at the lower end thereof is vertically movably mounted on the mast and through the opening.