{"id":789,"date":"2013-08-05T18:09:19","date_gmt":"2013-08-05T18:09:19","guid":{"rendered":"http:\/\/theflatironblog.com\/?p=789"},"modified":"2016-07-28T17:30:14","modified_gmt":"2016-07-28T17:30:14","slug":"crews-install-i-15-accelerated-bridge-construction-in-57-hours","status":"publish","type":"post","link":"https:\/\/www.flatironcorp.com\/news\/crews-install-i-15-accelerated-bridge-construction-in-57-hours\/","title":{"rendered":"Crews Install I-15 Accelerated Bridge Construction Project in 57 hours"},"content":{"rendered":"

In late May, Flatiron crews completed\u00a0the company\u2019s second accelerated bridge construction<\/a>\u00a0project, the Interstate 15 Manderfield Bridges. The project\u00a0is on I-15 in central Utah, just north of Beaver.<\/p>\n

Crews built two new bridges on either side of the existing bridges\u00a0on temporary falsework over a period of three months, and\u00a0abutments were also built under the existing bridges. Crews were\u00a0given a 67-hour window to move traffic to one bridge, demolish\u00a0the other, slide the new bridge into place, and complete grading\u00a0and paving. The same process was followed for the second\u00a0bridge within the same time window. Despite some extra time\u00a0spent over-excavating unforeseen soft soils, crews finished in just under 57 hours\u2014leaving about ten hours to spare\u2014a huge feat.<\/p>\n\"photo<\/a>\n

\u201cWe came up with multiple schedules, including best- and worst-\u00a0case scenarios,\u201d said project manager Chris Mari. \u201cEach schedule\u00a0allowed for asphalt paving during the required temperatures.\u201d<\/p>\n

The project was Flatiron\u2019s second using accelerated bridge\u00a0construction techniques. Flatiron\u2019s first ABC project, the\u00a0Interstate 80 bridges over the Weber River in Echo Junction,\u00a0Utah, followed a similar construction model, but with a few\u00a0key differences. First, on this project, both bridges were\u00a0moved in one window, which complicated the operation.<\/p>\n

\u201cThis was challenging because we had to incorporate a traffic\u00a0switch between the two bridge moves,\u201d said Chris. \u201cWe had\u00a0to maintain one lane of traffic on I-15 at all times, which meant\u00a0two crossovers north of the bridges, and two south.\u201d<\/p>\n

Second, the Manderfield Bridges were built with the\u00a0approach slabs attached, instead of using prefabricated\u00a0slabs installed after the move. This meant a bigger\u00a0bridge and more falsework during construction.<\/p>\n\"photo<\/a>\n

Another key difference was how the bridge was moved.\u00a0Crews jacked up the bridge shortly before the operation,\u00a0installed slide tracks, and hooked up 75 megaton\u00a0hydraulic rams to the bridge. The rams then pushed\u00a0the 700-ton bridge 60 feet to its final position.<\/p>\n

The I-15 corridor is the major north-south highway\u00a0through Utah, and connects the state to Las Vegas.\u00a0Before construction, the Manderfield Bridges were in need\u00a0of repair\u2014the crew had to install temporary shoring to\u00a0help support the bridges before other work began.<\/p>\n\"detail<\/a>\n

Owner\u00a0Utah Department of Transportation\u00a0calls ABC construction\u00a0\u201cthe future of bridge construction in Utah.\u201d They have implemented\u00a0ABC techniques on a number of projects across the state\u00a0because of the decreased impacts to the traveling public,\u00a0increased quality, and increased safety the technique affords.<\/p>\n

The project originally used hybrid composite beams, but\u00a0the Utah Department of Transportation changed these to\u00a0traditional precast concrete girders with precast concrete deck\u00a0panels. This accelerated the project even more, but required almost a complete redesign of the bridge structures.<\/p>\n

With the bridge move complete, crews wrapped\u00a0up remaining work on the project in June.<\/p>\n","protected":false},"excerpt":{"rendered":"

In late May, Flatiron crews completed\u00a0the company\u2019s second accelerated bridge construction\u00a0project, the Interstate 15 Manderfield Bridges. The project\u00a0is on I-15 in central Utah, just north of Beaver.…<\/p>\n","protected":false},"author":3,"featured_media":805,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[40],"tags":[45,85,181,237,328,428,438],"class_list":["post-789","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-project-news","tag-accelerated-bridge-construction","tag-bridges","tag-flatiron-construction","tag-interstate-15-manderfield-bridges","tag-precast-concrete-girders","tag-transportation-infrastructure","tag-utah-department-of-transportation"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/posts\/789"}],"collection":[{"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/comments?post=789"}],"version-history":[{"count":0,"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/posts\/789\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/media\/805"}],"wp:attachment":[{"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/media?parent=789"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/categories?post=789"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.flatironcorp.com\/wp-json\/wp\/v2\/tags?post=789"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}