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Cianbro Corp. in Pittsfield, ME won a $19.5 million firm-fixed-price contract to repair the caisson (gate) and the sill at Portsmouth Naval Shipyard’s Drydock 2 facility.
Portsmouth Naval Shipyard, 1 of 4 remaining naval shipyards in the United States, provides the US Navy’s nuclear powered submarine fleet with overhaul, repair, and modernization facilities.
To carry out the repairs, Cianbro will build a temporary cofferdam to allow demolition and reconstruction of the drydock’s sill structure…
Cianbro will add rock anchors and dowels to the existing sill and wing walls in order to stabilize them. The company will then demolish the existing granite masonry blocks and concrete bedding, and begin phased demolition of existing sill structures, including caisson sill armoring.
Once the demolition is complete, Cianbro will build a reinforced concrete sill structure with 2 seats, each capable of superflood operations, anchored to the bedrock with rock anchors. The contractor expects to complete the work by October 2010.
The contract was competitively procured via the Navy Electronic Commerce Online website, with 2 proposals received by the Naval Facilities Engineering Command Mid-Atlantic in Norfolk, VA (N40085-10-C-9401).