a suitable manner referring now to fig6 and 7 the synthetic plastic hall is formed by lengths of the components 1 of fig1 which lengths are anchored at the bottom of the hall by means of rope the lengths covering the end sections are anchored to the lengths in the opposite end section by means of rope which runs under the lateral lengths in fig6 one can see that only the corner portions of the end sections are not covered by lengths it is however possible to custom make special lengths for these parts as well a cold resistant uv stabilized self extinguishing soft pvc sheet of a thickness of 0 30 mm was laminated to both sides of a 12 mm thick and 135 mm wide web of polyurethane cellular plastic having a density of 28 kg m 3 in the manner illustrated in fig1 lamination was carried out with a pvc urethane glue adhesive layer the cellular plastic fastens thereto so effectively that it will function as reinforcement for the pvc sheet this made the use of woven fabric reinforced pvc sheeting as surface covering of the polyurethane cellular plastic core unnecessary all of the edges of the lengths were reinforced with 8 mm polypropylene line said line was hemmed in by means of heat gluing in the excess edge.