Seal arrangement for an expansion motion joint

An expansion gap sealing device comprising a flexible bridging unit and two anchoring units for securing said flexible bridging unit in each of said anchoring units, each anchoring unit comprising an integral flange with a respective dovetail groove and an overlapping flange covering said respective dovetail groove, said flexible bridging unit comprising two anchoring portions each with a sectional dovetail configuration fitting into said respective dovetail groove, and an elongated clamping element (11a, 11b) in said sectional dovetail configuration securing said flexible bridging unit in said respective dovetail groove, said elongated clamping element comprising a rigid body having a cross-section permitting an insertion of said elongated clamping element into said sectional dovetail configuration and permitting a turning of said elongated clamping element about a longitudinal axis of said elongated clamping element, said turning placing said elongated clamping element in an anchoring position, and at least one member (36, 43) securing said elongated clamping element in said respective dovetail groove in said anchoring position.