{"id":17952,"date":"2022-07-20T18:03:14","date_gmt":"2022-07-21T01:03:14","guid":{"rendered":"https:\/\/www.robbinstbm.com\/?p=17952"},"modified":"2022-07-20T18:03:32","modified_gmt":"2022-07-21T01:03:32","slug":"mill-creek-diameter-change","status":"publish","type":"post","link":"https:\/\/www.robbinstbm.com\/es\/mill-creek-diameter-change\/","title":{"rendered":"Unprecedented In-Tunnel Diameter Conversion of the Largest Hard Rock TBM in the U.S."},"content":{"rendered":"<p>The largest hard rock TBM ever to bore in the USA, an 11.6 m diameter Robbins Main Beam TBM, recently underwent a planned in-tunnel diameter change to a more compact 9.9 meters. The first-of-its-kind conversion process for the Main Beam TBM was undertaken 2.8 km into the bore and was not done inside a shaft or pre-excavated portal. This paper will detail the unique dual-diameter machine designed for the Mill Creek Drainage Relief Tunnel in Dallas, Texas, USA, machine performance, and successful size conversion process that took place in early 2021\u2014a process that utilized the four C\u2019s of construction to enormous benefit: Communication, Cooperation, Collaboration and Coordination.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The largest hard rock TBM ever to bore in the USA, an 11.6 m diameter Robbins Main Beam TBM, recently underwent a planned in-tunnel diameter change to a more compact 9.9 meters. The first-of-its-kind conversion process for the Main Beam TBM was undertaken 2.8 km into the bore and was not done inside a shaft or pre-excavated portal.<\/p>\n","protected":false},"author":2,"featured_media":17953,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[7],"tags":[],"class_list":["post-17952","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-white-papers"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Unprecedented In-Tunnel Diameter Conversion of the Largest Hard Rock TBM in the U.S. - Robbins<\/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.robbinstbm.com\/mill-creek-diameter-change\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Unprecedented In-Tunnel Diameter Conversion of the Largest Hard Rock TBM in the U.S. - Robbins\" \/>\n<meta property=\"og:description\" content=\"The largest hard rock TBM ever to bore in the USA, an 11.6 m diameter Robbins Main Beam TBM, recently underwent a planned in-tunnel diameter change to a more compact 9.9 meters. 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