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CTT
provided complete
engineering design services—structural, marine, mechanical (Cribb
Consulting Engineers) and hydraulic engineering services—in the
coordination, planning and design of support and utilities for the
installation of a sedimentation control system with vendor provided units
by
Scour Systems, Inc.
for the existing container berth at the Columbus Street Terminal of the
SCSPA to eliminate future dredging requirements. Two systems consisting of
five (5) 36-inch diameter turbo scour units (TSU’s) each were arranged in
a scour array on the outboard edge of the terminal pier to accomplish the
sedimentation control along the container berth for approximately 1600
feet from the eastern end. Scour Systems, Inc. performed the proprietary
design of the sedimentation control system. The sedimentation control
system enhances the water velocity within the container berth during each
outgoing tidal cycle with the intention of re-suspending sediment deposits
and moving into the current of the tidal cycle once an initial dredge
event occurs.
Steel pipe piles were installed as guide piles with steel
guide rails welded to the pile to provide a track for turbo scour units to
be raised and lowered for service. In that no permanent lifting mechanisms
could remain in-place, a temporary/portable service platform was designed
for maintenance of the TSU’s. A mobile crane with a capacity of 5 tons is
used to lift the TSU’s out for servicing and maintenance.
A new pile supported control room building was also
designed to be located on the inboard face of the pier and contains the
new control room for both systems as well as separate pump rooms for each
system. Rigid hydraulic header lines (hydraulic pressure, return and case
drain) were supported and extended under the pier from the control
building for each system along with branches to each unit. New dock boxes
were constructed to house the control valves and other controls at each
TSU. Expansion loops were designed for pipe expansion.
Due to the draft of the post-Panamax container ships as
well as a required scanning angle of up to 12º off of the pier face, the
existing fender pile system required removal of up to 6 fender piles at
each TSU. New Trellex/Metso Minerals fender panel systems were designed
and installed to provide adequate moorage equal to or exceeding the
capacity of the existing fender pile system. |
