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TRANSCRIPT
19/06/2012
1
Dover Harbour
Pier A
Extension and
Fender Upgrade
CULLEN GRUMMITT & ROE Consulting Engineers – Harbour, Civil and Structural
PIANC SEMINAR
Monday 11th June at 14:00
BIGGER SHIPS – BIGGER PORTS
Contents
• Port of Dover overview and requirements
• Increase in vessel sizes using the Port
• Design challenges
• Pier A - Extension
• Pier A - Fender Upgrade
• Pier A - Construction progress
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Port of Dover - Overview
• Europe’s busiest and most successful ferry port
– Handles around £80 billion of trade each year
– Supports around 22,000 jobs locally
• Ferries arriving and departing approximately every 20 minutes.
• Continued development of the Port includes catering for longer, faster and
more efficient Ro-Ro vessels
Port of Dover - Location
Pier A
NORTH
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Pier A - Location
Pier A
Pier
Extension
Berth 3 NORTH
Eastern
Breakwater
Port of Dover Requirements & CGR Design Brief
• To cater for the projected increase in size of ferries in the near future.
• New vessels are in excess of 200m long.
• To improve operational safety of existing ferries using the Port and to
comply with the Port Marine Safety Code.
• A vessel simulation study by the Port of Dover and HR Wallingford
confirmed the feasibility of a pier
extension length of 40m.
• Piers to be extended to a length of
220m.
• Stern and side fender systems
to be upgraded to accommodate the
larger ferries.
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Existing Berth & Vessel lengths
Pier A
Berth 3
Berth 2
• DFDS/ D Class vessel 186m long and 28m beam
Longer Vessels
Pier A
Berth 3
Berth 2
• Spirit Class vessel 209m long and 34m beam
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Longer Vessels & Berth Extension
Pier A
Berth 3
Berth 2
• To comply with Port Marine Safety Code, a fixed construction/ installation is
required seawards of vessel bow
Design Issues
• To accommodate the large
design vessel, the following
issues (and many others) were
assessed in detail:
– Design vessel Displacement
Tonnage, LOA and hull profile
– Berthing arrangements
– Berthing angles and velocity
– Mooring line arrangements
– Fender positioning
– Position on the berth
– Accidental berthing criteria
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Options Assessment
• Options considered
– Dolphin supported on multiple piles
or large diameter piles
– Sheet piled or combi-wall cofferdam
– Concrete caisson
– Floating structure
• Factors influencing option selection
– Outline design feasibility
– Minimising disruption to port operations during
construction (keep 2 berth operational)
– Construction methodologies
– Budget estimates and construction cost
– Improvements to marine safety
– Mitigate the possibility of disruption to ferry
schedules (every 20 to 30 mins)
Pier Extension Design Overview
• Pier Extension
• 4m diameter tubular steel monopile
with reinforced concrete cap including
fender system and walkway bridge
• Piled deck extension and pile fenders
• Monopile fender system detailed design by
Ingenieurbüro Rossburger (FenderTeam)
Existing
Pier Head
4No. Pile Fenders Ф4m Monopile
Monopile
Fenders
28m Deck Extension 8m MP Head
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Pier Extension - Monopile
• Monopile is the prime
defence against
runaway vessel.
• Designed to resist 1500
tonne impact at
+10.5mCD.
• Significant design
criteria and is
anticipated to damage
vessel.
• Fendering provided to
protect vessels at lower
berthing velocities;
during normal &
accidental and breasting
loads.
Pier Extension – Monopile
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Pier Extension – Construction Progress
Fender Upgrade Design
• Larger vessels impose larger berthing energies
• Side and stern fenders upgraded
• Stern fenders limited by reaction capacity of existing berthing dolphins
• Parallel Motion Fenders selected at stern to accept multiple-deck vessels
without double impact
Pier
Extension
4No. New
Stern Fenders
11No. New
Side Fenders
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Stern Berthing Assessment
Self supporting
linkspan fingers
Stern Berthing Assessment
Self supporting
linkspan fingers
7m tidal
range
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Stern Berthing Assessment
Stern Fenders – Construction Progress
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Stern Fenders – Construction Progress
Side Fenders - Design
• Maintain existing berthing line
• Fit fenders within existing slots
and quay structure
• Limited to 300mm deflection
• Accommodate vessel belting
which varies from vessel to
vessel
• Arch fenders fixed to rear of
panel
• 11No. fenders, 2 different types
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Side Fenders - Supports
Side Fenders – Construction progress
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Dover Harbour
Pier A
Extension and
Fender Upgrade
CULLEN GRUMMITT & ROE Consulting Engineers – Harbour, Civil and Structural
PIANC SEMINAR
Monday 11th June at 14:00
BIGGER SHIPS – BIGGER PORTS