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eLibrary > 25/30473638 DC BS 6349-8 Maritime structures - Code of practice for the design of Ro-Ro ramps, linkspans and walkways >

25/30473638 DC BS 6349-8 Maritime structures - Code of practice for the design of Ro-Ro ramps, linkspans and walkways, 2025

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25/30473638 DC BS 6349-8 Maritime structures - Code of practice for the design of Ro-Ro ramps, linkspans and walkways, 2025

30473638_Form 36
BS 6349-8 - draft 230125_DPC_text [Go to Page]
0 Introduction
0.1 Design traditions
0.2 Design of complex machinery
Section 1: General
1 Scope
2 Normative References
3 Terms, Definitions & Symbols [Go to Page]
3.1 Terms and definitions [Go to Page]
3.1.1 abutment
3.1.2 actuated ramp
3.1.3 approach ramp
3.1.4 approach span
3.1.5 Basis of Design
3.1.6 belting
3.1.7 berthing line
3.1.8 blunt-ended vessel ramp
3.1.9 boarding pod
3.1.10 brow
3.1.11 coaming
3.1.12 designer
3.1.13 design water level variation
3.1.14 elephant foot
3.1.15 extreme water level
3.1.16 facility
3.1.17 finger flap
3.1.18 fixed shore ramp
3.1.19 fixed walkway
3.1.20 flap
3.1.21 final hinged link
3.1.22 fixed high-level walkway.
3.1.23 gantry frame
3.1.24 guide pile
3.1.25 hoist tower
3.1.26 interface
3.1.27 interface limit line
3.1.28 lifting frame
3.1.29 linkspan
3.1.30 machinery
3.1.31 mobile gantry frame
3.1.32 operating water level
3.1.33 operator
3.1.34 operational envelope
3.1.35 owner
3.1.36 passenger walkway
3.1.37 PLC
3.1.38 pontoon
3.1.39 restraint systems
3.1.40 PAX
3.1.41 PAX opening
3.1.42 pedestrian restraint system
3.1.43 vehicle restraint system
3.1.44 RoRo ramp
3.1.45 semi-submersible linkspan
3.1.46 service walkway
3.1.47 Seaport Boarding Bridge (SPBB)
3.1.48 secondary load path
3.1.49 secondary pod
3.1.50 Splayed end
3.1.51 sprag
3.1.52 telescopic final link
3.1.53 terminal interface pod
3.1.54 threshold height
3.1.55 vessel
3.1.56 vessel ramp
3.1.57 well deck
3.2 Symbols
4 General Recommendations [Go to Page]
4.1 Limit States [Go to Page]
4.1.1 General
4.1.2 Consequence class
4.1.3 Ultimate Limit State
4.1.4 Serviceability Limit State
4.1.5 Accidental conditions
4.1.6 Design conditions
4.2 Quality systems
4.3 Planning
4.4 Risk assessment
4.5 Basis of design
4.6 Design parameters [Go to Page]
4.6.1 General
4.6.2 Layout of facility
4.6.3 Vessels
4.6.4 Usage and design life
4.6.5 Method of vessel control
4.6.6 Degree of automation in operation of facility
4.6.7 Types of vehicles
4.6.8 Passenger traffic
4.6.9 Parking of vehicles or storage
4.6.10 Services
4.6.11 Operational equipment
4.6.12 Effect of passing vessels
4.7 Environmental conditions [Go to Page]
4.7.1 Environmental impact
4.7.2 Water levels
4.7.3 Wave data
4.7.4 Meteorology and climatology
4.7.5 Bathymetry
4.7.6 Geotechnical considerations
4.7.7 Water quality
4.8 Operation and maintenance manual
4.9 Fire
5 Loads, movements & factors [Go to Page]
5.1 General
5.2 Permanent actions
5.3 Snow
5.4 Wind
5.5 Marine
5.6 Berthing
5.7 Mooring
5.8 Operational movements
5.9 Thermal movements
5.10 Temporary and erection loads
5.11 Traffic [Go to Page]
5.11.1 General
5.11.2 Fatigue
5.11.3 Port-specific vehicles
5.12 Pedestrians and operatives [Go to Page]
5.12.1 Vibration limits
5.13 Operational Equipment
5.14 Accidental
5.15 Geotechnical
5.16 Seismic
5.17 Live loads on vessel’s ramp
5.18 Loads on Vehicle & Pedestrian Restraint Systems & Kerbs [Go to Page]
5.18.1 General
5.18.2 Vehicle restraint systems parallel to running traffic (glancing blow impact scenarios)
5.18.3 Vehicle restraint systems at right angles to running traffic (head-on impact scenarios)
6 Structural Analysis & Design [Go to Page]
6.1 Design approach
6.2 Foundations
6.3 Articulation
6.4 Stability
6.5 Sinking of Floating Structures
6.6 Bearings [Go to Page]
6.6.1 Function of bearings
6.6.2 Design considerations
6.6.3 Limit state requirements [Go to Page]
6.6.3.1 Serviceability limit state.
6.6.3.2 Ultimate limit state.
6.6.4 Provision for resetting and replacement.
6.6.5 Provision for handling.
6.6.6 Access
6.6.7 Durability
6.6.8 Bearing movement restraint
6.6.9 Uplift on bearings
6.6.10 Lubrication
6.6.11 Illustrations of typical linkspan bearing assemblies [Go to Page]
6.6.11.1 Commonly used linkspan and SPBB bearing assemblies
6.6.12 Outer bearing plates or spreader plates
6.6.13 Use of different types of bearing
6.6.14 Positioning of bearings
6.6.15 Effects of variation within tolerances
6.6.16 Loading resulting from resistance to movement [Go to Page]
6.6.16.1 General
6.6.17 Limitation on friction coefficient values
6.6.18 Coefficient of friction for roller bearings.
6.6.19 Coefficient of friction for sliding bearings.
6.6.20 Coefficient of friction for guides.
6.6.21 Restraints against translation.
6.6.22 Effects on other parts of the structure
6.6.23 Movement indicators
6.7 Particular recommendations for roller and rocker bearings [Go to Page]
6.7.1 Function
6.7.2 Curved surfaces
6.7.3 Surfaces in contact
6.7.4 Length of rollers
6.7.5 Guidance of rollers
6.7.6 Prevention of sliding
6.7.7 Allowable loads on steel and cast-iron roller and rocker bearings [Go to Page]
6.7.7.1 Design limit state
6.7.8 Cylinder on curved surface
6.7.9 Cylinder on flat surface
6.7.10 Sphere in spherical seating
6.7.11 Sphere on flat surface.
6.8 Particular recommendations for knuckle and leaf bearings [Go to Page]
6.8.1 General [Go to Page]
6.8.1.1 Function
6.8.1.2 Curved surfaces
6.8.1.3 Mating surfaces
6.8.1.4 Separation of parts
6.8.2 Pins
6.8.3 Allowable bearing pressures for knuckle and leaf bearings [Go to Page]
6.8.3.1 Design limit state
6.8.3.2 Bearing pressures
6.9 Guides [Go to Page]
6.9.1 General
6.10 Prevention of collapse
6.11 Integration with operational equipment
6.12 Maintenance & parking
6.13 Proprietary items
7 Vehicle linkspans [Go to Page]
7.1 General
7.2 Types of linkspan [Go to Page]
7.2.1 Mechanically lifted & lowered linkspan
7.2.2 Integral tank linkspans [Go to Page]
7.2.2.1 Submerged tank linkspans
7.2.2.2 Integral pontoon linkspans
7.2.3 Pontoon supported linkspans
7.2.4 Berthing Pontoon with Linkspan Bridge
7.2.5 Hybrid System
7.3 Fixed Shore Elements
7.4 Design conditions [Go to Page]
7.4.1 Operating condition
7.4.2 Extreme conditions
7.4.3 Methods of Adjustment
7.4.4 Prevention of Collapse
7.4.5 Maintenance Condition
7.4.6 Design Criteria
8 Linkspan Geometr [Go to Page]
8.1 General
8.2 Geometry [Go to Page]
8.2.1 Vehicle lane widths
8.2.2 Walkway widths
8.2.3 Operational spaces and services provision
8.2.4 Services provision and lane control
8.2.5 Seaward end of the linkspan
8.2.6 Vehicle lane headroom
8.2.7 Walkway headroom
8.2.8 Linkspan, pontoon and vessel interface [Go to Page]
8.2.8.1 General
8.2.8.2 Typical vessel ramps
8.2.8.3 Blunt-ended ramps
8.2.8.4 Vessels without ramps
8.2.8.5 Quarter ramps
8.2.8.6 Fast craft
8.2.8.7 Vessel ramp landing area
8.2.8.8 Other Clearances
8.2.9 Plan movements
8.2.10 Vertical Geometry [Go to Page]
8.2.10.1 General
8.2.10.2 Maximum longitudinal gradient
8.2.10.3 Transitions
8.2.11 Transition geometry study [Go to Page]
8.2.11.1 Linkspan, Pontoon or Fixed Quay nose dimensions and Slopes
8.2.11.2 Pontoon deck length
9 Vehicle linkspan furniture, finishes & corrosion protection [Go to Page]
9.1 General
9.2 Corrosion protection
9.3 Roadway & footway surfaces
9.4 Vehicle & pedestrian restraint systems & kerbs [Go to Page]
9.4.1 General
9.4.2 Parapets & safety barriers
9.4.3 Pedestrian Guardrails & Handrails
9.4.4 Kerbs
9.4.5 Shore end barriers
10 Sea Port Boarding Bridges (SPBB) [Go to Page]
10.1 General
10.2 Types of SPBB [Go to Page]
10.2.1 Examples of different types of SPBB sub-assemblies [Go to Page]
10.2.1.1 Departing from quay level
10.2.1.2 Tunnels departing from elevated walkway or terminal building, fixed location
10.2.1.3 Tunnels fixed to the terminal building and movable along the quay
10.2.1.4 Tunnels moveable along the terminal and quay
10.3 Design considerations [Go to Page]
10.3.1 The design of the SPBB for disembarkation and embarkation
10.3.2 SPBB operating conditions
10.3.3 The SPBB assembly when the vessel is approaching and during mooring
10.3.4 Stowing of the SPBB for departure
10.3.5 Methods of adjustment
10.3.6 Auto-retract system
10.3.7 Prevention of Collapse
10.3.8 Mains power failure
10.3.9 Maintenance condition
10.3.10 Design criteria
11 SPBB geometry [Go to Page]
11.1 General
11.2 Plan and height geometry [Go to Page]
11.2.1 Width Between Handrails
11.2.2 Joints in the walkway
11.2.3 Interface with the vessel PAX opening
11.2.4 Interface with the coaming
11.3 Final link movements [Go to Page]
11.3.1 Plan movements
11.3.2 Final link vertical geometry
11.4 Walkway tunnel longitudinal gradients
11.5 Transition Areas
11.6 Vertical Clearances
11.7 Safety chains
12 SPBB furniture, finishes & corrosion/fire protection [Go to Page]
12.1 General
12.2 Corrosion protection
12.3 Walkway tunnel surfaces and finishes [Go to Page]
12.3.1 General
12.4 Fire protection [Go to Page]
12.4.1 Fire evacuation
13 Setting the linkspan or SPBB design to work [Go to Page]
13.1 General
13.2 Independent Design Check [Go to Page]
13.2.1 General
13.2.2 Design Check Process
13.2.3 Management of the check process
13.2.4 Machinery considerations
13.3 Load testing [Go to Page]
13.3.1 General
13.3.2 Lifted & lower linkspans or SPBBs
13.3.3 Floating linkspans and pontoons with separate linkspans
13.4 Site verification
14 Supply of Machinery (Safety) Regulations [Go to Page]
14.1 Scope and general requirements
14.2 Installations requiring enhanced quality assurance
14.3 Modification of machinery [Go to Page]
14.3.1 Compliance with the Supply of Machinery (Safety) Regulations [Go to Page]

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