{"id":119062,"date":"2026-04-07T16:53:43","date_gmt":"2026-04-07T14:53:43","guid":{"rendered":"https:\/\/www.maccaferri.com\/fr\/success-stories\/drainage-gaz-sous-etancheite-de-bassin-besignan-26\/"},"modified":"2026-04-07T16:53:43","modified_gmt":"2026-04-07T14:53:43","slug":"drainage-gaz-sous-etancheite-de-bassin-besignan-26","status":"publish","type":"stories","link":"https:\/\/www.maccaferri.com\/fr\/exemples-de-r\u00e9ussites\/drainage-gaz-sous-etancheite-de-bassin-besignan-26\/","title":{"rendered":"Drainage gaz sous \u00e9tanch\u00e9it\u00e9 de bassin, B\u00e9signan, 26"},"content":{"rendered":"
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    Drainage gaz sous \u00e9tanch\u00e9it\u00e9 de bassin<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Le MacDrain W1041 drainage efficace des gaz jusqu'aux exutoires<\/p>\n \n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n\n <\/div>\n <\/div>

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    Challenge<\/h3>\n <\/div>\n <\/div>\n <\/div>\n <\/div> \n <\/div>\n
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    Dans le cadre de la r\u00c3\u00a9alisation d’un bassin de r\u00c3\u00a9tention sur la commune de B\u00c3\u00a9signan (26), le bassin doit \u00c3\u00aatre \u00c3\u00a9tanch\u00c3\u00a9. Cependant, il y a un risque de remont\u00c3\u00a9e de gaz sous la g\u00c3\u00a9omembrane. Si ces gaz ne sont pas \u00c3\u00a9vacu\u00c3\u00a9s, ils risquent de s’accumuler et de cr\u00c3\u00a9er des sous-pressions. Il peut arriver que des bulles se forment dans le fond du bassin sous la g\u00c3\u00a9omembrane, aussi appel\u00c3\u00a9es hippopotames, \u00c3\u00a9tirant la g\u00c3\u00a9omembrane au del\u00c3\u00a0 de sa limite d’\u00c3\u00a9lasticit\u00c3\u00a9 et d\u00c3\u00a9gradant ainsi l’\u00c3\u00a9tanch\u00c3\u00a9it\u00c3\u00a9. Pour \u00c3\u00a9viter cela, un dispositif de drainage doit \u00c3\u00aatre mis en oeuvre sous la g\u00c3\u00a9omembrane. Traditionnellement, il est r\u00c3\u00a9alis\u00c3\u00a9 en mat\u00c3\u00a9riau granulaire avec un g\u00c3\u00a9otextile de filtration-s\u00c3\u00a9paration en sous-face, ainsi qu’un g\u00c3\u00a9otextile de protection de la g\u00c3\u00a9omembrane.<\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n

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    Solution<\/h3>\n <\/div>\n <\/div>\n <\/div>\n <\/div> \n <\/div>\n
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    Maccaferri a propos\u00c3\u00a9 un g\u00c3\u00a9ocomposite de drainage MacDrain W1041 pour collecter et \u00c3\u00a9vacuer les gaz sous la g\u00c3\u00a9omembrane. Il est dispos\u00c3\u00a9 en bandes sur environ 30% de la surface, sur un g\u00c3\u00a9otextile antipoin\u00c3\u00a7onnant. Ce g\u00c3\u00a9ocomposite est constitu\u00c3\u00a9 d’une \u00c3\u00a2me drainante de 4mm d’\u00c3\u00a9paisseur, de type g\u00c3\u00a9omatelas en monofilaments de polypropyl\u00c3\u00a8ne enchev\u00c3\u00aatr\u00c3\u00a9s formant des canaux parall\u00c3\u00a8les qui conf\u00c3\u00a8rent au g\u00c3\u00a9ocomposite une forte r\u00c3\u00a9sistance \u00c3\u00a0 la compression. Des g\u00c3\u00a9otextiles de filtration-s\u00c3\u00a9paration sont thermoli\u00c3\u00a9s de part et d’autre de l’\u00c3\u00a2me drainante pour retenir les particules de sol tout en laissant les fluides passer. Lorsque les gaz remontent sous le bassin, ils sont drain\u00c3\u00a9s par les bandes de g\u00c3\u00a9ocomposite et guid\u00c3\u00a9s le long des talus jusqu’en cr\u00c3\u00aate, o\u00c3\u00b9 il sont \u00c3\u00a9vacu\u00c3\u00a9s par des \u00c3\u00a9vents. Le MacDrain W1041 permet de drainer efficacement les gaz jusqu’aux exutoires, sans n\u00c3\u00a9cessiter de surcreusement important par rapport \u00c3\u00a0 la c\u00c3\u00b4te de fond de bassin gr\u00c3\u00a2ce \u00c3\u00a0 sa faible \u00c3\u00a9paisseur, et \u00c3\u00a9conomisant l’apport de mat\u00c3\u00a9riaux granulaires. L’utilisation d’un g\u00c3\u00a9ocomposite de drainage des gaz permet \u00c3\u00a9galement de limiter \u00c3\u00a0 30% la surface \u00c3\u00a0 couvrir. Si des remont\u00c3\u00a9es de nappe phr\u00c3\u00a9atique avaient \u00c3\u00a9t\u00c3\u00a9 attendues, ce g\u00c3\u00a9ocomposite aurait \u00c3\u00a9galement pu servir \u00c3\u00a0 drainer les eaux sous bassin s’il \u00c3\u00a9tait dispos\u00c3\u00a9 sur toute la surface et connect\u00c3\u00a9 \u00c3\u00a0 une tranch\u00c3\u00a9e drainante et un exutoire.<\/p>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/div>

    Used Products<\/h2>
    \"G\u00e9ocomposites<\/div>
    G\u00e9ocomposites de drainage<\/h6>Ces familles de produits sp\u00e9cialis\u00e9s mettent en \u00e9vidence la polyvalence et l’adaptabilit\u00e9 des g\u00e9ocomposites de drainage,<\/span>Voir\n \n <\/a>
    star<\/span><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

    Maccaferri a propos\u00c3\u00a9 un g\u00c3\u00a9ocomposite de drainage MacDrain W1041 pour collecter et \u00c3\u00a9vacuer les gaz sous la g\u00c3\u00a9omembrane. Il est dispos\u00c3\u00a9 e<\/p>\n","protected":false},"featured_media":119047,"parent":0,"menu_order":0,"template":"","stories-category":[],"stories-tag":[],"class_list":["post-119062","stories","type-stories","status-publish","has-post-thumbnail","hentry"],"acf":{"products":[113576],"applications":[103514,103514],"solutions":[103640],"sectors":[103460]},"yoast_head":"\nDrainage gaz sous \u00e9tanch\u00e9it\u00e9 de bassin, B\u00e9signan, 26 - Maccaferri France<\/title>\n<meta name=\"description\" content=\"D\u00e9couvrez nos r\u00e9ussites : Drainage gaz sous \u00e9tanch\u00e9it\u00e9 de bassin, B\u00e9signan, 26. 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