Abstract: A panel set for the formation of athermanous walls, each panel comprising a central core made from insulating plastics material and formed between two rigid sheets. The connection between panels is effected by coupling devices, each of which is formed by two mating elements, the corresponding elements of one coupling device are located on adjacent panels. One of the mating elements is provided with an outwardly active male member and the other mating element is provided with an active female member, adapted to receive the male member. The female mating element has an adjustable retractable resilient stop adapted to allow the insertion and retention of the panels together and to force juxtaposed panels closer together.

Abstract: Wall panels having thermal insulation sandwiched between opposed metal skins, are joined together to provide a rigid joint which is flush and vacuum tight. Narrow heavy gauge elongated strip plates fit precisely within offsets in both skins adjacent to the joining surfaces, and are bolted to the skins. One strip plate includes internally threaded holes in which the fastening bolts are inserted and engaged from within the panel using a screwdriver or a wrench which passes from the opposite side through a clearance channel in the panel.The other plate is held on the opposite panel side by bolts which engage threaded nuts attached to the adjacent offset skin portions. All bolt fasteners are accessible and attached from the same wall surface, with the bolts within the panels passing freely through the threaded nuts on the opposite skin. Accurate spacing of the holes in the strip plates and skin offsets assures a compressed butt joint between the insulation of the clamped panels.