Expansion joint strip for permanent, reliable sealing of joints between or in structures and/or parts thereof comprising a resilient material, in particular of expansion joints (104, 19) between structures, such as tunnel segments, comprising a weatherstrip, a. the weatherstrip comprises, inside it, cavities which extend continuously along its central longitudinal axis, b. ridges (5, 5d) which extend along the central longitudinal axis are moulded onto the sides of the weatherstrip, c. the head region of a least one ridge (5, 5d), which region faces away from the weatherstrip, is pulled in, forming a partially circular cross-section that extends along the centra longitudinal axis, d. the ridges (5, 5d) are moulded onto the sides of the weatherstrip, in a central region of the cavities of the weatherstrip, e. projections which are triangular in cross-section and extend along the central longitudinal axis are moulded onto the opposing sides of the weatherstrip and onto the ridge sides of the ridges (5, 5d), f. an edge region of the weatherstrip is formed as a peripheral strip or lug, g. the strip extends beyond the ridge sides, facing away from the central longitudinal axis, of the peripheral ridges of the sides of the weatherstrip, along a central transverse axis, h. the strip extends along the central longitudinal axis of the weatherstrip, i. the strip comprises at least one hollow chamber that extends along the central longitudinal axis, j. the hollow chamber is formed, in cross-section, as a polygon having at least one corner that protrudes into the interior of the polygon, k. a weld-on lug, which extends along the central longitudinal axis of the weatherstrip, is arranged on the outside of the strip, l. the weld-on lug, which contains a plastics-like material, extends along the central longitudinal axis of the weatherstrip, m. which comprises two weld-on lug arms, in cross-section, n. which are oriented in parallel with the ridges of the weatherstrip, o. ridges are moulded onto the ends of the weld-on lug arms facing away from the weatherstrip, p. the ridges together with the weld-on lug arms enclose an angle of greater than 90°, q. a sealing film is set against the outside of the weld-on lug, advantageously the two are adhesively bonded or welded together, r. the sealing film extends along the weld-on lug and the weatherstrip and extends beyond the ends thereof. a. the weatherstrip comprises, inside it, cavities which extend continuously along its central longitudinal axis, b. ridges (5, 5d) which extend along the central longitudinal axis are moulded onto the sides of the weatherstrip, c. the head region of a least one ridge (5, 5d), which region faces away from the weatherstrip, is pulled in, forming a partially circular cross-section that extends along the centra longitudinal axis, d. the ridges (5, 5d) are moulded onto the sides of the weatherstrip, in a central region of the cavities of the weatherstrip, e. projections which are triangular in cross-section and extend along the central longitudinal axis are moulded onto the opposing sides of the weatherstrip and onto the ridge sides of the ridges (5, 5d), f. an edge region of the weatherstrip is formed as a peripheral strip or lug, g. the strip extends beyond the ridge sides, facing away from the central longitudinal axis, of the peripheral ridges of the sides of the weatherstrip, along a central transverse axis, h. the strip extends along the central longitudinal axis of the weatherstrip, i. the strip comprises at least one hollow chamber that extends along the central longitudinal axis, j. the hollow chamber is formed, in cross-section, as a polygon having at least one corner that protrudes into the interior of the polygon, k. a weld-on lug, which extends along the central longitudinal axis of the weatherstrip, is arranged on the outside of the strip, l. the weld-on lug, which contains a plastics-like material, extends along the central longitudinal axis of the weatherstrip, m. which comprises two weld-on lug arms, in cross-section, n. which are oriented in parallel with the ridges of the weatherstrip, o. ridges are moulded onto the ends of the weld-on lug arms facing away from the weatherstrip, p. the ridges together with the weld-on lug arms enclose an angle of greater than 90°, q. a sealing film is set against the outside of the weld-on lug, advantageously the two are adhesively bonded or welded together, r. the sealing film extends along the weld-on lug and the weatherstrip and extends beyond the ends thereof.