Patent ID: 8168703

Claim:
Membrane body ( 1 ) comprising at least a first panel ( 10 ) and a second panel ( 11 ) connected together in an adhesive manner by respective facing faces ( 12 , 13 ), and a plurality of tie rods ( 16 ) arranged stably between the panels ( 10 , 11 ) according to set pattern; each said tie rod ( 16 ) having respective end portions ( 17 , 18 ); said body further comprising insulation means ( 15 ) arranged between the panels and associated with each said tie rod ( 16 ) to leave said tie rod ( 16 ) longitudinally free between said panels ( 10 , 11 ); said tie rod ( 16 ) being suitable for resisting a dual tensile membrane stress acting on each of said pair of panels ( 10 , 11 ), and keeping said panels ( 10 , 11 ) substantially free of tension during use; said second panel ( 11 ) covering said face ( 12 ) of said first panel ( 10 ) in such a way that said second panel ( 11 ) adheres integrally to said first panel ( 10 ) wherein said insulation means ( 15 ) comprises a plurality of flexible sheaths ( 15 ) arranged between said respective panels ( 10 , 11 ) along force lines (F), each sheath housing a corresponding tie rod ( 16 ) in a longitudinally free manner, wherein said tie rod ( 16 ) comprises a plurality of fibres ( 24 ) free of a least a set material, that are arranged inside one said sheath ( 15 ) in such a way as to be longitudinally freely slideable, and wherein said sheath ( 15 ) has an annular section interrupted at a first panel ( 10 ) ( 11 ) of the two said panels ( 10 , 11 ).