Length-adjustable device for curing a tubular liner

A device for curing resin-impregnated lining tubes using high-energy radiation, comprising at least two radiation sources for generating high-energy radiation, wherein the device has a front end, a rear end opposite the front end, two oppositely situated side ends, a top end, and a bottom end opposite the top end, wherein a length of the device, measured from the front end to the rear end, is smaller in a transport state than in an operating state, in that at least one element of the device is foldably, displaceably, rotatably, and/or movably supported, and wherein at least one first radiation source is situated farther from at least one additional radiation source, in the longitudinal direction of the device, in the operating state than in the transport state, and wherein the device includes a fastening point, at or near the front end and/or the rear end, on which a tensile force from a power source that is situated outside the device acts or can act, in particular at least in part, in the longitudinal direction of the device in order to transfer the device from the transport state into the operating state.