| 摘要 |
The invention relates to a thin, flexible membrane (12) particularly suitable for fastening to a wall (11) and/or a roof in a tunnel (10) by means of fastening devices (22), such as bolts, plugs or the like. The membrane (12) is formed with studs (18) and /or grooves (17) which at least protrude from one side so that water can run between the studs (18). Further, the membrane (12) consists of a thin sheet (16) which, on at least one side, has at least one fireproof layer (19,20) in the shape of a fiber cloth of a fire resistant or fireproof material made of basalt and/or carbon fiber, and that the sheet (16) is made of a fire resistant plastic material and that the fiber cloth (19,20) and the sheet (16) make an integral unit. The invention also relates to a method for the production of such a membrane where a sheet (16) of a fire resistant material is extruded from an extruder for thereafter to be subjected to calendaring before being led over a forming cylinder whilst a cloth (19,20,21) of flameproof material is combined continuously with the extruded sheet (16) during calendaring and/or over the forming cylinder whilst the surface of the extruded sheet (16) is still plastic so that forming over the form giving cylinder contributes to fasten or combine the plastic sheet and the basalt cloth (19,20,21) to make an integrated unit. |
