DEPARTMENT
OF THE NAVY
NAVAL AMPHIBIOUS BASE, LITTLE CREEK
Fender System Repairs to Lift Slip, Wharf, Pier 55, and Desert Cove Crane Hard-Point
Naval Amphibious Base, Little Creek
Virginia Beach, Virginia
On March 7, 2003, the Department of the Navy awarded Precon Marine, Inc. the $1,582,665 firm fixed contract to perform various pier, lift slip, and bulkhead repairs to fender systems; concrete demolition, concrete and specialty construction to Lift Slip, Wharf, Pier 55 and Desert Cove Hard-Point at Little Creek Naval Amphibious Base.
Special scheduling requirements on this contract required special attention to the scheduling and conduct of the work in connection with existing naval operations to ensure that one of the areas remained operational during the construction period.
Precon Marine was contracted to perform the demolition of the existing timber fender system and concrete curb on three structures that was in a state of disrepair and install a new fender system and plastic curb. The new fender system consisted of plastic composite pilings and plastic timbers and will accommodate the new SEABOSS modular Lightering System. Two foam filled marine donut fenders equipped with solar powered navigational lights were installed at the end of the Lift Slip. Six timber dolphins with navigational lights were installed at the end of Pier 55 to assist with the berthing of the SEABOSS modules.
8” Articulating Block Mats (ABM) were installed on the riprap slope below the wharf. ABM’s were formed with a double-layer woven fabric, joined together into a matrix of rectangular compartments each separated by a narrow perimeter of interwoven fabric and containing interconnecting high strength revetment cables. ABM forms were positioned on the slope areas to be protected, where they were filled with pumpable fine aggregate concrete (structural grout) to form an erosion control mattress of individual blocks in a bonded block pattern.
Desert Cove was originally constructed in 1953. The original design did not account for the large concentrated loads being applied in today's environment by mobile cranes and vehicle loads. The existing concrete wharf did not have the structural capacity to support the large mobile cranes used in current operations. Repairs to the existing concrete wharf were required.
The project included the demolition and
replacement of the existing Desert Cove Crane Hard-Point concrete deck. Steel sheet piles
were driven behind the existing cut off wall and the soil excavated to prepare for construction
of the new wharf. 18” and 24” prestressed concrete piles were utilized in the
construction of the new 32-foot x 90-foot crane hard-point.
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