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see ROCKINGHAM
(Thomas French photo)
The northbound bridge (in background) is complete and is carrying both northbound and southbound traffic, while the new southbound bridge is being erected. This photo shows five segment #4 placed on southbound pier 2 (closest pier), five segment #6 placed on southbound pier 3, and three segment #5 “drop-ins” placed between the two piers.
(Thomas French photo)
The first 200,000-lb. segment (#4) is being placed. It was delivered via the existing nearly 60-year-old truss bridge and is being swung over to land on top of the concrete pier caps and temp supports to the left.
Looking south at the southbound bridge girders.
ROCKINGHAM from page 1
beam bridge,” the company said in a statement. “The beam structure consists of five runs of seven individual concrete beams that were installed on temporary support framework, aligned and held in position with 30 steel strong backs. Cast-in-place concrete closures were placed between the ends of the beams and then three, 19 strand tendons running from abutment to abutment were installed and tensioned. Each bridge includes piers that vary in height from 70 to 138 feet tall. To accommodate VTrans’ stringent requirements for pier slenderness, we used two bearings per girder at each pier, which increased the rotational stiffness at the pier caps.”
Thomas French, senior project manager of HDR Engineering Manchester, N.H., the design firm on the job, said, “The precast girder fabricator delivered the bridge segments one at a time. They varied in weight up to nearly 200,000 pounds. Each segment was precast and includes pretensioned steel cables in them.”
Phillips noted working with the girders was a big challenge of the job.
“Splicing girders in mid-air … it was a big challenge how to connect them and the nature of the site, with the deep river below
(Thomas French photo)
The middle pier of northbound bridge being constructed. The piles, foundation and the columns are complete. The caps are being constructed (under the black tarps at the top).
the bridge working at height to erect the girders and handling the girders between two bridges,” he said. “We did it by rolling road blocks. We also needed to heat work areas for concrete placement in winters.” Reed & Reed used Manitowoc 16000 and
see ROCKINGHAM page 14
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