Commercial Construction & Renovation

MAY-JUN 2017

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RISING UP After the Smoke Had Cleared Over the next few days, the outlook began to brighten. D.H. Griffin Wrecking was already onsite for demolition. C.W. Matthews, the contractor selected for the rebuild, was collaborating with GDOT's engineers and vendors to identify ways to expedite the project. On April 5, GDOT announced a June 15 completion date, with financial incentives to finish even earlier. Taking an Alternate Route For the public, alternate routes meant major slowdowns. For the rebuild, it meant moving full-steam ahead. Instead of following the original bridge design, GDOT engineers came up with a redesign that made a 10-week completion realistic, including using a different beam type, retrofitting salvageable columns and using an accelerated concrete mix. Had the original bridge design from 1984 been followed, the time for beam fabrication alone would have significantly slowed progress. Retrofitting salvageable columns, which entailed cutting them sev- eral feet below the caps, removing the old concrete cover material, and building new columns around the existing steel, further streamlined the effort. Using a concrete mix with 24-hour strength development enabled each phase of construction to proceed at a much faster pace. Every Second Counts Within a half-hour after the bridge col- lapsed, GDOT and C.W. Matthews were in communication. Over the next few days, the contractor was right alongside GDOT engineers, providing input on the redesign from a construction perspective. "We'd look for any issues that could be detrimental to the schedule and address them," says Adam Grist, VP of structures. "The criteria were that it had to work from a design standpoint and be able to be built as quickly as possible." As the redesign came together, C.W. Matthews immediately lined up its resources and ordered supplies, getting firm com- mitments from vendors to meet expedited schedules. "All our suppliers were able to meet or beat the schedule," Grist says. "And the concrete plant was flexible enough to get us what we needed whenever we needed it. We never waited on concrete." 24/7 Construction and Public Outreach As the week following the collapse came to a close, all heavy demolition was complete and 13 million pounds of rubble were hauled away. Construction was beginning, and the public would have virtual access to the jobsite through two construction cameras. The Georgia Department of Trans- portation contracted OxBlue for all of the project's construction camera service needs. The cameras on the jobsite provided still images, time-lapse video, "The local support was unbelievable, from businesses feeding the crews to people just thanking us for working so hard to get life back to normal." – Adam Grist, VP of Structures, C.W. Matthews Dan Garcia, President of C.W. Matthews Contracting Co. Adam Grist, Vice President – Structures of C.W. Matthews Contracting, Co. 186 COMMERCIAL CONSTRUCTION & RENOVATION — MAY : JUNE 2017

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