{"id":27393,"date":"2012-03-22T22:35:20","date_gmt":"2012-03-22T20:35:20","guid":{"rendered":"http:\/\/staging.sillon38.com\/?p=27393"},"modified":"2012-03-22T22:35:20","modified_gmt":"2012-03-22T20:35:20","slug":"examen-technique-complet-du-barrage-du-verney","status":"publish","type":"post","link":"https:\/\/www.sillon38.com\/blog\/2012\/03\/22\/examen-technique-complet-du-barrage-du-verney\/","title":{"rendered":"Examen technique complet du barrage du Verney"},"content":{"rendered":"<p><span style=\"color: #000080;\"><strong>Tous les 10 ans, la r\u00e9glementation pr\u00e9voit l\u2019Examen Technique Complet (ETC) des barrages, une op\u00e9ration qui<br \/>\nse d\u00e9roule du 12 au 30 mars sur le barrage du Verney. Pendant cette p\u00e9riode, la cote basse du barrage<br \/>\ninf\u00e9rieur de l\u2019am\u00e9nagement de Grand\u2019Maison permet l\u2019\u00e9tude approfondie du parement avec son nettoyage, la<br \/>\nr\u00e9paration des d\u00e9sordres du rev\u00eatement bitumineux et l\u2019\u00e9vacuation des corps flottants.<\/strong><\/span><\/p>\n<p><span style=\"color: #000080;\">Cet abaissement de la retenue offre \u00e9galement l\u2019opportunit\u00e9 de r\u00e9aliser de nombreux travaux sur l\u2019ensemble de<br \/>\nl\u2019am\u00e9nagement dans le domaine de la m\u00e9canique avec la v\u00e9rification des batardeaux, la visite et l\u2019expertise des<br \/>\nvannes de fond.<\/span><\/p>\n<p><span style=\"color: #000080;\">Pour r\u00e9aliser ces travaux sur le barrage, durant deux semaines, et permettre aux \u00e9quipes d\u2019intervenir en toute s\u00e9curit\u00e9<br \/>\nsur l\u2019\u00e9quipement, la centrale d\u2019Oz est \u00e0 l\u2019arr\u00eat et la centrale de Grand\u2019Maison est partiellement \u00e0 l\u2019arr\u00eat. Pendant cette<br \/>\np\u00e9riode d\u2019arr\u00eat, d\u2019autres chantiers sont r\u00e9alis\u00e9s au sein des 2 centrales : pas moins de 95 op\u00e9rations d\u2019entretien et de<br \/>\nmaintenance ont \u00e9t\u00e9 programm\u00e9es : turbines, groupes, transformateurs,\u2026 sont v\u00e9rifi\u00e9s, contr\u00f4l\u00e9s pour optimiser leur<br \/>\nfonctionnement et assurer l\u2019exploitation de l\u2019am\u00e9nagement en toute s\u00fbret\u00e9.<\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>La retenue du Verney : bassin inf\u00e9rieur de la STEP de Grand\u2019Maison<\/strong><br \/>\nLa centrale de Grand\u2019Maison est une Station de Transfert d\u2019\u00c9nergie par Pompage (STEP). Elle participe \u00e0 l\u2019\u00e9quilibre<br \/>\ndu r\u00e9seau \u00e9lectrique national. Une retenue sup\u00e9rieure est reli\u00e9e \u00e0 un bassin inf\u00e9rieur situ\u00e9 au niveau de la centrale. En<br \/>\np\u00e9riode de forte consommation, la centrale turbine l\u2019eau de la retenue sup\u00e9rieure. L\u2019eau rejoint ensuite le bassin aval.<\/span><\/p>\n<p><span style=\"color: #000080;\">En p\u00e9riode creuse, essentiellement la nuit et le week-end, l\u2019eau de la retenue inf\u00e9rieure est pomp\u00e9e vers la retenue<br \/>\nsup\u00e9rieure. Le syst\u00e8me permet ainsi de faire face rapidement \u00e0 une pointe de consommation. La retenue form\u00e9e en<br \/>\naltitude par le barrage de Grand\u2019Maison constitue le r\u00e9servoir sup\u00e9rieur, reli\u00e9 par des conduites \u00e0 la retenue du<br \/>\nVerney, 900 m plus bas, qui repr\u00e9sente le r\u00e9servoir inf\u00e9rieur avec une retenue de 15 millions de m\u00b3 d\u2019eau.<\/span><\/p>\n<p><span style=\"color: #000080;\"><strong>Une surveillance des ouvrages au service de la s\u00e9curit\u00e9<\/strong><br \/>\nD\u00e8s leur mise en eau et tout au long de leur exploitation, les barrages sont surveill\u00e9s, auscult\u00e9s et entretenus. Ils sont<br \/>\n\u00e9quip\u00e9s de diff\u00e9rents moyens permanents d\u2019auscultation, mis en place d\u00e8s la construction.<br \/>\nOn mesure en particulier les mouvements des barrages (par relev\u00e9 topographique et pendules d\u2019auscultation) et leur<br \/>\ncomportement hydraulique (influence de l\u2019eau sur la stabilit\u00e9 et le comportement de l\u2019ouvrage) par mesure des<br \/>\ninfiltrations d\u2019eau et des sous-pressions.<\/span><\/p>\n<p><span style=\"color: #000080;\">Tous les ouvrages hydrauliques du parc de production d\u2019EDF font, donc, l\u2019objet d\u2019un suivi et d\u2019un entretien r\u00e9gulier et<br \/>\ntr\u00e8s rigoureux, sous le contr\u00f4le vigilant des pouvoirs publics. En compl\u00e9ment de ce suivi constant de l\u2019\u00e9tat de sant\u00e9 des<br \/>\nouvrages, la r\u00e9glementation fran\u00e7aise en mati\u00e8re de s\u00e9curit\u00e9 des barrages et de pr\u00e9vention des risques, impose pour tous<br \/>\nles barrages d\u2019une hauteur sup\u00e9rieure \u00e0 20 m\u00e8tres, d\u2019effectuer tous les dix ans un Examen Technique Complet (ETC)<br \/>\ncomprenant la visite des parties immerg\u00e9es des ouvrages. Cette visite peut \u00eatre r\u00e9alis\u00e9e de deux fa\u00e7ons : soit par vidange<br \/>\ntotale de la retenue soit par visite subaquatique, soit par mise hors d\u2019eau de parties habituellement en eau, comme les<br \/>\nconduites forc\u00e9es sous le barrage.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jusqu&rsquo;au 30 mars, EDF r\u00e9alise un Examen Technique Complet du barrage du Verney pour une exploitation en toute s\u00fbret\u00e9 de l\u2019am\u00e9nagement de Grand\u2019Maison<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[1964],"class_list":["post-27393","post","type-post","status-publish","format-standard","hentry","category-hydraulique","tag-edf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Examen 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