{"id":29383,"date":"2012-08-02T10:51:17","date_gmt":"2012-08-02T08:51:17","guid":{"rendered":"http:\/\/staging.sillon38.com\/?p=29383"},"modified":"2012-08-02T10:51:17","modified_gmt":"2012-08-02T08:51:17","slug":"edf-realise-une-inspection-subaquatique-du-barrage-de-grandmaison","status":"publish","type":"post","link":"https:\/\/www.sillon38.com\/blog\/2012\/08\/02\/edf-realise-une-inspection-subaquatique-du-barrage-de-grandmaison\/","title":{"rendered":"EDF r\u00e9alise une inspection subaquatique du barrage de Grand\u2019Maison"},"content":{"rendered":"
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\"DSCN0221_BD_Ponton
Ponton de 300m2 install\u00e9 sur la retenue du barrage. <\/figcaption><\/figure>\n

La centrale de Grand-Maison est situ\u00e9e au c\u0153ur de la vall\u00e9e de l\u2019Eau d\u2019Olle qui, encadr\u00e9e par les massifs de Belledonne et des Grandes Rousses, s\u2019\u00e9tend de la Savoie jusqu\u2019\u00e0 la plaine de Bourg d\u2019Oisans et la vall\u00e9e de la Romanche.\u00a0La cr\u00eate du barrage de Grand-Maison est situ\u00e9e \u00e0 l\u2019altitude de 1 700 m. La centrale est situ\u00e9e sur la commune de Vaujany. <\/span><\/strong><\/span><\/p>\n

Mis en service en 1987, le barrage de Grand\u2019Maison est l\u2019ouvrage de t\u00eate de l\u2019am\u00e9nagement hydro\u00e9lectrique de Grand\u2019Maison, le plus puissant de France avec pr\u00e8s de 1800 MW mobilisables sur le r\u00e9seau \u00e9lectrique fran\u00e7ais en quelques minutes.<\/span><\/p>\n

Du 30 juillet au 3 ao\u00fbt 2012, pour la premi\u00e8re fois depuis la construction de l\u2019ouvrage, EDF r\u00e9alise une inspection subaquatique des galeries d\u2019amen\u00e9e et de vidange de fond du barrage de Grand\u2019Maison, organes majeurs de la s\u00fbret\u00e9 hydraulique de l\u2019ouvrage.<\/span><\/p>\n

Cette inspection se d\u00e9roule \u00e0 120 m de profondeur sous la retenue et n\u00e9cessite l\u2019intervention de deux plongeurs sp\u00e9cialis\u00e9s qui, confin\u00e9s dans des caissons hyperbares, auront pour mission d\u2019ouvrir les grilles donnant acc\u00e8s aux galeries immerg\u00e9es pour permettre le passage de deux robots sous-marins. Ces derniers, reli\u00e9s aux pontons par un \u00ab cordon ombilical \u00bb long de pr\u00e8s de 1000 m\u00e8tres, contr\u00f4lent l\u2019int\u00e9rieur des galeries afin de v\u00e9rifier leur int\u00e9grit\u00e9.<\/span><\/p>\n

Lors des travaux, le fonctionnement de la centrale de Grand\u2019Maison est suspendu du 30 juillet au 10 ao\u00fbt et le d\u00e9bit r\u00e9serv\u00e9 maintenu \u00e0 travers la prise d\u2019eau de la vidange de fond. Pour permettre une meilleure visibilit\u00e9 des relev\u00e9s vid\u00e9o des robots, le fonctionnement en pompage de la centrale de Grand\u2019Maison est suspendu 2 jours avant l\u2019intervention des robots.<\/span><\/p>\n

Cette investigation subaquatique est conduite simultan\u00e9ment avec l\u2019Examen Technique Complet (ETC) du barrage de Grand\u2019Maison afin de limiter au maximum l\u2019indisponibilit\u00e9 de l\u2019am\u00e9nagement et optimiser la mobilisation des moyens humains et techniques.<\/span><\/p>\n

Con\u00e7us pour une dur\u00e9e de vie tr\u00e8s longue, les ouvrages hydrauliques du parc de production d\u2019EDF font l\u2019objet d\u2019un suivi et d\u2019un entretien r\u00e9gulier et tr\u00e8s rigoureux, sous le contr\u00f4le vigilant des pouvoirs publics.<\/span><\/p>\n

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\"Mise
Mise \u00e0 l'eau des caissons<\/figcaption><\/figure>\n

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\"Ponton\"
Vue de loin du ponton <\/figcaption><\/figure>\n

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Illustrations: EDF UP Alpes – <\/span>Droits r\u00e9serv\u00e9s<\/span><\/strong><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Profitant d\u2019un Examen Technique Complet, EDF a pris l\u2019initiative de r\u00e9aliser, pour la premi\u00e8re fois depuis la mise en service du barrage en 1987, une inspection des galeries d\u2019amen\u00e9e et de vidange de fond.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,34],"tags":[673],"class_list":["post-29383","post","type-post","status-publish","format-standard","hentry","category-environnement","category-hydraulique","tag-barrage-de-grandmaison"],"yoast_head":"\nEDF r\u00e9alise une inspection subaquatique du barrage de Grand\u2019Maison -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.sillon38.com\/blog\/2012\/08\/02\/edf-realise-une-inspection-subaquatique-du-barrage-de-grandmaison\/\" \/>\n<meta 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