A water and/or oil-impermeable sealing mat consisting...

B - Operations – Transporting – 32 – B

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B32B 5/02 (2006.01) B32B 18/00 (2006.01) E02B 3/12 (2006.01) E02B 3/16 (2006.01) E02B 15/04 (2006.01) E02D 31/00 (2006.01)

Patent

CA 2037601

A water and/or oil-impermeable sealing mat is provided in form of a bentonite non-woven fabric combination with the possibility of transmitting shear from one batt layer to the other, i.e. on a slope shearing forces can be transmitted by the covering batt material through the layer of swellable clay into the supporting batt material. Such a sealing mat is a fiber-reinforced mineral seal permitting the transmission of shearing forces on slopes, without the risk of the layer of swellable clay itself becoming the preferred sliding plane. The sealing mat consists of a non-woven textile material as substrate layer, a layer of swellable clay, preferably sodium bentonite, and a cover layer consisting preferably also on a non-woven textile material, all three layers having been needlepunched together in the conventional manner in a needle loom. When moistened, the clay swells and forms the water and/or oil-impermeable layer. The water and/or oil-impermeable sealing mat is used especially in hydraulic engineering and in waste disposel engineering.

Cette invention concerne un mat isolant imperméable à l'eau et/ou à l'huile prenant la forme d'un composite bentonite/non-tissé adapté à la transmission des efforts de cisaillement d'une couche à l'autre, c'est-à-dire la transmission des efforts de cisaillement en talus de la couche supérieure à la couche inférieure à travers la couche intermédiaire d'argile gonflante. L'objet de l'invention constitue une couche d'étanchéité minérale renforcée de fibres adaptée à la transmission des forces de cisaillement en talus et qui élimine la possibilité que la couche d'argile gonflante devienne le plan de glissement préférentiel. Le mat isolant se compose d'une couche support en textile non tissé, d'une couche d'argile gonflante, de préférence une argile bentonitique sodique, et d'une couche de revêtement de préférence également en textile non tissé, les trois couches étant liées les unes aux autres par aiguilletage. Humidifiée, l'argile se gonfle pour former la couche imperméable à l'eau et à l'huile. L'objet de l'invention trouve des applications particulièrement en aménagement hydraulique et en technique d'élimination des déchets.

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