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A new concrete cable-stay bridge with a 354m main span is under construction on the US east coast’s Route 1 in Maine, close to historic Fort Knox. The bridge stretching across the Penobscot River is being built by a joint venture between Cianbro Corp of Pittsfield Maine and Reed & Reed, of Woolwich, Maine for the Maine Department of Transportation.
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| The US State of Maine‘s first cable-stay bridge is being constructed by Cianbro, Reed & Reed LLC, relying on Doka formwork for the 128 m high pylons. |
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The new bridge’s pylons will be 128m high. It will include two 3.4m vehicle lanes and a 2.1m multi-
use lane for pedestrians and bicycles. Formwork systems for the lower and upper pylons have been provided by Doka USA, together with the supply of self-climbing work platforms for the contractor to work on the permanent cables on the bridge.
The part of the pylon below the bridge deck consists of two Cshaped legs which rise approximately 38m high. The approximately 90m high and rectangular shaped upper pylons are 4.3m wide and taper on the longer side from 11m at the bottom to 8m at the top. The contractors relied on Doka Top 50 timber beam formwork in combination with the crane lifted Doka MF 240 climbing system.
The optional upgrade of the standard Top 50 system with a truss-support saved the contractor the installation of approximately 320 wet ties for each of the 18 lifts. A total of 5760 wet ties represent a significant labor cost saving for the contractor, making the Top 50 System the most economical forming system for this challenging job. “The typical pour on the upper pylons is 4.7m high and the concrete is generally poured in a weekly cycle. “The 2.4m-wide MF 240 platforms also provide the workers with a good-sized space for increased safety which is essential, working at heights of several hundred feet,” says Harry Murphy, Doka USA.
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