| 摘要 |
<p>The structure includes a series of glass sheet assemblies separated by gas spaces. The thickness of the third sheet assembly exceeds that of the second sheet assembly and/or that of the first sheet assembly. The third assembly comprises at least three sheets bonded by an adhesive layer. The sheet of the third assembly which faces the protected side, is thinner than the others in this assembly, being preferably 3 mm or less. The thickness of the third assembly exceeds that of the second, which in turn is thicker than the first. The third assembly has at least 130% the thickness of the second. The second assembly has at least 130% the thickness of the first. The first and/or second assemblies are bonded composites, the adhesive thickness being preferably 15% that of the respective assembly. Alternatively the first and second assemblies each comprise a single sheet of hardened safety glass. The first and second interspaces are 12-16 mm. The first sheet assembly is 7-12 mm thick and the second is 11-22 mm thick. Adhesive layers are formed by polyvinyl butyral sheets and are preferably 1.5 mm thick. At least one assembly, preferably the second, includes a layer of transparent fire protection gel, preferably of sodium silicate, located between two sheets. At least one interspace is filled with a gas of low thermal conductivity, especially argon or krypton. At least one sheet is float glass, hardened safety glass, polyacrylate, polycarbonate and/or includes an infra-red reflecting coating. The interspace is sealed off and placed in a common frame.</p> |
