Coupling device for coupling tower segments (210, 220), which are arranged on one another, of a tubular tower of a wind power installation, comprising - a coupling plate for contact against an abutting region of the tower segments (210, 220) arranged on one another, comprising o a fastening portion having a first contact surface which is designed to be arranged on a circumferential surface of a first tower segment, and ∘ a connecting portion which is adjacent to the fastening portion (310, 410) and has a second contact surface which is designed to be arranged on a circumferential surface of a second tower segment and has at least one through-opening for the passage of a threaded element, - a receiving plate (500, 501) which is arranged on the connecting portion, on an outer surface of the coupling plate opposite the second contact surface, comprising at least one receiving element for receiving a counter element which can be bolted to the threaded element, wherein the at least one receiving element is formed coaxially with respect to the through-opening and as an anti-twist protection for blocking the counter element from rotating and preventing bolting to the threaded element, characterized by a guide lug which - is arranged on an outer edge of the coupling plate, which outer edge is adjacent to the connecting portion in a main direction of extent of the coupling plate, and protrudes obliquely from the outer edge, wherein preferably the guide lug extends from the outer edge (330, 430) at an angle of between 90° and 180° with respect to the connecting portion or optionally with respect to the corresponding connecting portion. - a coupling plate for contact against an abutting region of the tower segments (210, 220) arranged on one another, comprising o a fastening portion having a first contact surface which is designed to be arranged on a circumferential surface of a first tower segment, and ∘ a connecting portion which is adjacent to the fastening portion (310, 410) and has a second contact surface which is designed to be arranged on a circumferential surface of a second tower segment and has at least one through-opening for the passage of a threaded element, o a fastening portion having a first contact surface which is designed to be arranged on a circumferential surface of a first tower segment, and ∘ a connecting portion which is adjacent to the fastening portion (310, 410) and has a second contact surface which is designed to be arranged on a circumferential surface of a second tower segment and has at least one through-opening for the passage of a threaded element, - a receiving plate (500, 501) which is arranged on the connecting portion, on an outer surface of the coupling plate opposite the second contact surface, comprising at least one receiving element for receiving a counter element which can be bolted to the threaded element, wherein the at least one receiving element is formed coaxially with respect to the through-opening and as an anti-twist protection for blocking the counter element from rotating and preventing bolting to the threaded element, characterized by wherein the at least one receiving element is formed coaxially with respect to the through-opening and as an anti-twist protection for blocking the counter element from rotating and preventing bolting to the threaded element, characterized by a guide lug which - is arranged on an outer edge of the coupling plate, which outer edge is adjacent to the connecting portion in a main direction of extent of the coupling plate, and protrudes obliquely from the outer edge, - is arranged on an outer edge of the coupling plate, which outer edge is adjacent to the connecting portion in a main direction of extent of the coupling plate, and protrudes obliquely from the outer edge, wherein preferably the guide lug extends from the outer edge (330, 430) at an angle of between 90° and 180° with respect to the connecting portion or optionally with respect to the corresponding connecting portion.