{"id":24827,"date":"2026-08-03T17:46:31","date_gmt":"2026-08-03T15:46:31","guid":{"rendered":"https:\/\/incoperfil.com\/?post_type=guia-tecnica&#038;p=24827"},"modified":"2026-09-17T11:20:16","modified_gmt":"2026-09-17T09:20:16","slug":"19-plancher-collaborant-sans-etaiement","status":"publish","type":"guia-tecnica","link":"https:\/\/incoperfil.com\/fr\/guia-tecnica\/19-plancher-collaborant-sans-etaiement\/","title":{"rendered":"19. Plancher collaborant sans \u00e9taiement"},"content":{"rendered":"<p data-start=\"59\" data-end=\"299\">Le plancher collaborant sans \u00e9taiement repose sur la capacit\u00e9 portante du profil nervur\u00e9 \u00e0 supporter le poids du b\u00e9ton frais ainsi que les charges de chantier durant la phase de coffrage, sans n\u00e9cessiter d&rsquo;appuis provisoires interm\u00e9diaires.<\/p>\n<p data-start=\"301\" data-end=\"493\">Cette solution permet de r\u00e9duire les d\u00e9lais de montage et de simplifier l&rsquo;organisation du chantier, \u00e0 condition que sa faisabilit\u00e9 soit pr\u00e9alablement v\u00e9rifi\u00e9e par un calcul de dimensionnement.<\/p>\n<h2 data-section-id=\"7bw0la\" data-start=\"495\" data-end=\"524\">Fonctionnement structurel<\/h2>\n<p data-start=\"526\" data-end=\"651\">Pendant la phase de coffrage, le bac acier collaborant fonctionne comme un \u00e9l\u00e9ment simplement appuy\u00e9 ou continu, supportant :<\/p>\n<ul data-start=\"653\" data-end=\"755\">\n<li data-section-id=\"mv5eeh\" data-start=\"653\" data-end=\"684\">Le poids propre du bac acier.<\/li>\n<li data-section-id=\"7c7tji\" data-start=\"685\" data-end=\"711\">Le poids du b\u00e9ton frais.<\/li>\n<li data-section-id=\"1kkergm\" data-start=\"712\" data-end=\"728\">Les armatures.<\/li>\n<li data-section-id=\"1b2c922\" data-start=\"729\" data-end=\"755\">Les charges de chantier.<\/li>\n<\/ul>\n<p><\/p>\n<p data-start=\"757\" data-end=\"932\">Une fois le b\u00e9ton durci, le syst\u00e8me entre en phase mixte et la dalle mixte obtenue combine la r\u00e9sistance \u00e0 la traction de l&rsquo;acier avec la r\u00e9sistance \u00e0 la compression du b\u00e9ton.<\/p>\n<p data-start=\"934\" data-end=\"1304\">Pour r\u00e9aliser un plancher sans \u00e9taiement, le profil doit satisfaire aux exigences de r\u00e9sistance et de d\u00e9formation d\u00e9finies par la norme UNE-EN 1993-1-3 pour la phase de coffrage. En pratique, la fl\u00e8che admissible est g\u00e9n\u00e9ralement limit\u00e9e \u00e0 des valeurs de l&rsquo;ordre de L\/180 ou L\/200, afin de ma\u00eetriser les d\u00e9formations et de garantir la plan\u00e9it\u00e9 de l&rsquo;ensemble.<\/p>\n<h2 data-section-id=\"vj6q1u\" data-start=\"1306\" data-end=\"1349\">Avantages de la solution sans \u00e9taiement<\/h2>\n<ul data-start=\"1351\" data-end=\"1581\">\n<li data-section-id=\"vjvlqe\" data-start=\"1351\" data-end=\"1386\">R\u00e9duction des d\u00e9lais d&rsquo;ex\u00e9cution.<\/li>\n<li data-section-id=\"w0hqb6\" data-start=\"1387\" data-end=\"1435\">Suppression du syst\u00e8me d&rsquo;\u00e9taiement provisoire.<\/li>\n<li data-section-id=\"7vqtrc\" data-start=\"1436\" data-end=\"1506\">Meilleure accessibilit\u00e9 des niveaux inf\u00e9rieurs pendant le b\u00e9tonnage.<\/li>\n<li data-section-id=\"1wr1xti\" data-start=\"1507\" data-end=\"1581\">Possibilit\u00e9 de r\u00e9aliser simultan\u00e9ment des travaux sur plusieurs niveaux.<\/li>\n<\/ul>\n<p><\/p>\n<p data-start=\"1583\" data-end=\"1682\">Ces avantages doivent \u00eatre \u00e9valu\u00e9s en tenant compte des conditions structurelles propres au projet.<\/p>\n<h2 data-section-id=\"1avrk9x\" data-start=\"1684\" data-end=\"1725\">Limitations et crit\u00e8res de conception<\/h2>\n<p data-start=\"1727\" data-end=\"1797\">La possibilit\u00e9 de se passer d&rsquo;\u00e9taiement d\u00e9pend de plusieurs facteurs :<\/p>\n<ul>\n<li data-start=\"1799\" data-end=\"2015\"><strong data-start=\"1799\" data-end=\"1833\">Profil et hauteur des nervures<\/strong><br data-start=\"1833\" data-end=\"1836\" \/>Les profils de plus grande hauteur, tels que INCO 100.3, permettent g\u00e9n\u00e9ralement de franchir des port\u00e9es plus importantes sans \u00e9taiement que les profils de hauteur inf\u00e9rieure.<\/li>\n<li data-start=\"2017\" data-end=\"2175\"><strong data-start=\"2017\" data-end=\"2043\">\u00c9paisseur du bac acier<\/strong><br data-start=\"2043\" data-end=\"2046\" \/>Des \u00e9paisseurs plus importantes (jusqu&rsquo;\u00e0 1,20 mm) augmentent la rigidit\u00e9 et r\u00e9duisent la fl\u00e8che pendant la phase de coffrage.<\/li>\n<li data-start=\"2177\" data-end=\"2355\"><strong data-start=\"2177\" data-end=\"2209\">\u00c9paisseur totale de la dalle<\/strong><br data-start=\"2209\" data-end=\"2212\" \/>Une dalle plus \u00e9paisse implique un poids plus \u00e9lev\u00e9 de b\u00e9ton lors du coulage, ce qui peut limiter la faisabilit\u00e9 d&rsquo;une solution sans \u00e9taiement.<\/li>\n<li data-start=\"2357\" data-end=\"2632\"><strong data-start=\"2357\" data-end=\"2386\">Port\u00e9e libre entre appuis<\/strong><br data-start=\"2386\" data-end=\"2389\" \/>Elle est g\u00e9n\u00e9ralement comprise entre 2 et 5 m, selon le profil, l&rsquo;\u00e9paisseur du bac et les charges appliqu\u00e9es. Pour des port\u00e9es proches de la limite sup\u00e9rieure, un appui interm\u00e9diaire peut \u00eatre n\u00e9cessaire afin de ma\u00eetriser les d\u00e9formations.<\/li>\n<li data-start=\"2634\" data-end=\"2845\"><strong data-start=\"2634\" data-end=\"2655\">Nombre de trav\u00e9es<\/strong><br data-start=\"2655\" data-end=\"2658\" \/>Dans les configurations continues \u00e0 plusieurs trav\u00e9es, la redistribution des moments peut am\u00e9liorer le comportement structural par rapport \u00e0 des solutions strictement simplement appuy\u00e9es.<\/li>\n<\/ul>\n<p><\/p>\n<p data-start=\"2847\" data-end=\"3038\">Le dimensionnement doit analyser s\u00e9par\u00e9ment la phase de coffrage (en fonction du calepinage r\u00e9el des bacs acier) et la phase mixte (en consid\u00e9rant le sch\u00e9ma structurel d\u00e9finitif du plancher).<\/p>\n<h2 class=\"PDq2pG_selectionAnchorContainer\" data-section-id=\"1079bb9\" data-start=\"18\" data-end=\"32\">Conclusion<\/h2>\n<p data-start=\"34\" data-end=\"459\">Le plancher collaborant sans \u00e9taiement constitue une solution techniquement viable d\u00e8s lors que les exigences de r\u00e9sistance et de d\u00e9formation applicables \u00e0 la phase de coffrage sont respect\u00e9es. Sa mise en \u0153uvre correcte, fond\u00e9e sur un dimensionnement structurel et un contr\u00f4le rigoureux de l&rsquo;ex\u00e9cution, permet d&rsquo;optimiser les d\u00e9lais et les ressources sans compromettre la s\u00e9curit\u00e9 ni les performances en service de l&rsquo;ouvrage.<\/p>\n<h2 data-section-id=\"ogorcb\" data-start=\"461\" data-end=\"492\">Manuel technique Incoperfil<\/h2>\n<p data-start=\"494\" data-end=\"830\">Pour une pr\u00e9sentation compl\u00e8te du syst\u00e8me, des crit\u00e8res de conception, des bases de calcul, des tableaux de r\u00e9sistance, des d\u00e9tails constructifs et des proc\u00e9dures de mise en \u0153uvre, veuillez consulter le Manuel Technique du Plancher Collaborant d&rsquo;Incoperfil, disponible sur inscription dans la rubrique Documentation du site web.<\/p>\n<hr data-start=\"5611\" data-end=\"5614\" \/>\n<p data-start=\"832\" data-end=\"871\">Derni\u00e8re mise \u00e0 jour : F\u00e9vrier 2026<\/p>\n<p data-start=\"873\" data-end=\"908\">\u00a9 Incoperfil. Tous droits r\u00e9serv\u00e9s.<\/p>\n<p data-start=\"910\" data-end=\"1119\">Le contenu technique de cet article fait partie du Manuel Technique du Plancher Collaborant ainsi que de la documentation enregistr\u00e9e par Incoperfil aupr\u00e8s de ColorIURIS (Acte n\u00b0 1-INCOPERFIL-12.2025).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le plancher collaborant sans \u00e9taiement permet de r\u00e9aliser la dalle sans \u00e9tais pendant le b\u00e9tonnage, optimisant ainsi les d\u00e9lais d&rsquo;ex\u00e9cution et les ressources sur le chantier. Les profils INCO 70.4, INCO 100.3 et INCO 100.3 R permettent diff\u00e9rentes configurations selon la port\u00e9e, l&rsquo;\u00e9paisseur de la dalle et les charges, conform\u00e9ment \u00e0 la r\u00e9glementation en vigueur.<\/p>\n","protected":false},"author":2,"featured_media":14114,"menu_order":20,"template":"","meta":{"_acf_changed":false},"categories":[1327],"tags":[],"class_list":["post-24827","guia-tecnica","type-guia-tecnica","status-publish","has-post-thumbnail","hentry","category-guides-techniques-pour-plancher-collaborant"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>19. 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