Monday, August 21, 2017


  


Scope of Work
Cianbro constructed a 2,119 ft long, 57 ft wide cable stayed bridge including twin columns/pylon reaching 440 ft in the air where the Prospect side pylon includes an elevator and observatory area.

Project Details
  • Performed 20,000 cy of structural earth excavation and 2,700 cy of structural rock
  • Drove 288 each HP 14 x 117 H-pile
  • Erected two 60 ft x 70 ft x 17 ft cast-in-place footings including 1,200,000 lbs of reinforcing steel, 2,600 cy of concrete in Pier 1 footing and 3,300 cy of concrete in Pier 2 footing
  • Constructed two cast-in-place lower pylons with #18 rebar, including 1,500,000 lbs of reinforcing steel, and 3,050 cy of 6,000 psi concrete placed in 36 lifts
  • Constructed two cast-in-place upper pylons including 5,200 cy of 6,000 psi concrete placed in 15 lifts and 580 tons of #10 rebar with a top elevation of 447 ft
  • Constructed the mainspan/backspan segments including 14,000 cy of concrete placed in 91 mainspan segments and 90 backspan segments with 1,587 tons of rebar
  • Installed 40 cable stays ranging from 283 ft to 1,136 ft in length
  • Installed 1,000,000 lbs of transverse and longitudinal post-tensioning:  305,000 lbs of post-tension bars, 250,000 lbs transverse  post-tension strand, and 324,000 lbs drape and continuity post-tension strand

This bridge is unique to the State of Maine, as it is the only cable-stayed bridge and will become the tallest occupied structure in the State of Maine.
  

Unique Challenge



The cables were strung through the pylons rather than attached to the pylons eliminating attachment stress points. The cable passes through cradles designed to hold the individual strands of the cable in place avoiding strand-to-strand contact with the cable, which could possibly weaken the strands. The team predicts inspection and repair of the bridge’s cable system will be easier to manage and less costly since the individual strands are removable.

Project Information

Owner:
Maine Department of Transportation

Type of Project:
Transportation 

Construction Schedule:
Completed October 2006

Location:
Prospect Verona, ME

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