{"id":11249,"date":"2019-09-04T15:17:03","date_gmt":"2019-09-04T22:17:03","guid":{"rendered":"https:\/\/robbinstbm.com\/?p=11249"},"modified":"2020-01-07T11:11:34","modified_gmt":"2020-01-07T19:11:34","slug":"parmer-lane-double-shield","status":"publish","type":"post","link":"https:\/\/www.robbinstbm.com\/zh-hans\/parmer-lane-double-shield\/","title":{"rendered":"Compact TBM bores longest Rock Tunnel at 2.46 m Diameter"},"content":{"rendered":"<p>In August 2019, a small diameter <a href=\"https:\/\/www.robbinstbm.com\/products\/tunnel-boring-machines\/double-shield\/\">Double Shield TBM<\/a> made a big impact. The 2.46 m (8.07 ft) diameter Robbins machine completed 3,475 m (11,400 ft) of boring with no intermediate access, making it the longest rock tunnel ever bored by a Double Shield TBM under 2.5 m (8.2 ft) in diameter.<\/p>\n\t\t<div class=\"post-gallery\">\n\t\t\t<div class=\"gallery-previous\"><\/div>\n\t\t\t<div class=\"gallery-next\"><\/div>\n\t\t\t<ul>\n\t\t\t\t\t\t\t<li class=\"gallery-image-0\"><div class=\"gallery-image\" style=\"background-image:url(https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2019\/09\/20190806_robbinsco-3193.jpg);\"><\/div><\/li>\n\t\t\t\t\t\t\t\t<li class=\"gallery-image-1\"><div class=\"gallery-image\" style=\"background-image:url(https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2019\/09\/20190806_robbinsco-3063.jpg);\"><\/div><\/li>\n\t\t\t\t\t\t\t\t<li class=\"gallery-image-2\"><div class=\"gallery-image\" style=\"background-image:url(https:\/\/www.robbinstbm.com\/wp-content\/uploads\/2019\/09\/20190806_robbinsco-3127.jpg);\"><\/div><\/li>\n\t\t\t\t\t\t\t<\/ul>\n\t\t<\/div>\n\t\t\n<p>The machine completed the Parmer Lane Wastewater Interceptor in Austin, Texas, USA for contractor S.J. Louis Construction. Despite obstacles including two tight curves of 150 m (500 ft) radius and unexpected ground conditions that required modification of the cutterhead in the tunnel, advance rates were good. The machine reached up to 380 m (1,250 ft) per month while mining in single 12-hour shifts per day. \u201cIt was a hard rock TBM, and it performed better than expected through hard rock,\u201d said Zach West, Project Manager for S.J. Louis.<\/p>\n<p>The challenges for the TBM and its crew were varied, explained West. \u201cThe pairing of this tunnel length, which is on the longer side, and the diameter, which is on the smaller side, is challenging.\u00a0 The survey in a small tunnel with tight radius curves and limited surface access for over two miles is very difficult.\u201d He added that the shallow tunnel depth, and the alignment to within a few feet of sanitary lines, high-pressure gas mains, and fuel tanks for gas stations, made TBM guidance critical. \u00a0\u201cI would say that I am most proud of our ability to guide the machine successfully through these obstacles and into our retrieval shaft within our expected tolerances.\u201d<\/p>\n<p>Through one stretch, the tunnel advanced directly between a 30 cm (12 in) diameter, high-pressure gas main and fuel tanks for a gas station with limited as-built information.\u00a0 \u201cNavigating this section took a great deal of coordination with the local utility companies.\u00a0 Because the tunnel diameter was too small for an automated guidance system, we manually surveyed the front of the machine at every push to ensure the machine was on track,\u201d said West.<\/p>\n<p>\u201cI\u2019m proud that they mined the longest tunnel to date for a small shielded gripper machine of this size without any safety issues.\u00a0 Kudos to their management philosophy and jobsite team,\u201d said Tom Fuerst, Robbins Utility Tunneling Sales Manager. Robbins assisted the crew while in the tight 150 m (500 ft) curves and helped with modifications required to the cutterhead and disc cutter arrangement.<\/p>\n<p>The tunnel is located in an environmentally sensitive aquifer, with ground conditions ranging from soft dolomite with clay to limestone from 13 to 68 MPa (2,000 to 10,000 psi) UCS. \u00a0 \u201cWhile we tunneled through the softer material, our best advance rate was close to 0.9 m (3 ft) per hour.\u00a0 When we tunneled through the expected limestone, advance rates were over 5.2 m (17 ft) per hour.\u00a0 Our best day was 25 m (81 ft) in a single shift,\u201d said West.<\/p>\n<p>The majority of the tunnel used a simple two-rock-bolt pattern for support.\u00a0 In the last 10% of the tunnel, ribs and lagging were used as support. Final carrier pipe, which is now being installed, consists of 110 cm (42 in) diameter fiberglass pipe.<\/p>\n<p>The successful project is part of a larger trend towards small diameter, TBM-driven rock tunnels in the United States, says Fuerst. \u201cIt is primarily due to demographics and business growth.\u00a0 The parts of the USA that are growing need to build out their sewer and water infrastructure. TBMs can mine long distances with tight curves.\u00a0 They can reduce the need for multiple shafts, which lowers the overall project cost.\u00a0 And, given that most small diameter pipelines follow a road or municipal right-of-way, traffic problems are reduced significantly compared with open cut operations.\u201d<\/p>\n<p>The Parmer Lane Wastewater Interceptor connects to two existing lift stations at Lake Creek and Rattan Creek.\u00a0 The tunnel allows for these lift stations to be decommissioned, and will provide additional flow capacity by gravity, reducing operating costs for the City of Austin.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In August 2019, a small diameter Double Shield TBM made a big impact. The 2.46 m (8.07 ft) diameter Robbins machine completed 3,475 m (11,400 ft) of boring with no intermediate access, making it the longest rock tunnel ever bored by a Double Shield TBM under 2.5 m (8.2 ft) in diameter.<\/p>\n","protected":false},"author":2,"featured_media":11250,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":"","_links_to":"","_links_to_target":""},"categories":[10,3],"tags":[],"class_list":["post-11249","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-press-releases"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Compact TBM bores longest Rock Tunnel at 2.46 m Diameter - Robbins<\/title>\n<meta name=\"description\" content=\"In August 2019, a small diameter Double Shield TBM made a big impact. 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