离岸直升机起落甲板设计指南 OFFSHORE HELIDECK DESIGN GUIDELINES 1(52)

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9.4.4 Interconnected Modules
It will often be the case (and in particular on a fixed offshore installation) that the helideck support structure will be positioned above a module on the deck, usually the accommodation module.  The designer therefore has to be aware of the integration of the helideck design with the module design, as the structural supports for both units may be common.  As well as this, additional safety features such as blast walls, etc., may form part of the module design and could also have a bearing on the design of the helideck support structure.
9.4.5  Maintenance
It is quite common that the helideck support structure will have limited access once installed. Therefore, the designer should ensure that the structure is as maintenance free as possible and, wherever possible, easy access should be designed into the structure to facilitate future planned inspection and maintenance. A large number of helideck support structures are propped cantilevers.  The addition of purpose built anchor points for abseiling inspection access in the future is recommended.
9.5  APPURTENANCES
In addition to the design of the primary steelwork of the helideck, the designer also has to consider loads from the appurtenances associated with the helideck.  These appurtenances will include:
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Fire monitor / access platforms

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Stairways, ladders, walkways and handrailing

.  
Drains system

.  
Perimeter safety net

.  
General, perimeter and flood lighting fixings

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Tiedown fixings

.  
Helideck net fixings

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Refuelling dispenser skid (if fitted)

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Communications aerials and meteorological equipment (if fitted to the helideck structure).

9.6  LOAD COMBINATIONS AND LOAD FACTORS
9.6.1  Introduction
Each design code recommends a particular set of load combinations and factors to be considered. The designer also needs to consider the load conditions that can occur during fabrication, lifting, loadout and transportation of the helideck, and both static and dynamic forces that will be encountered.
The designer may also be asked to design suitable lifting points and sea-fastening points. Any local strengthening should be considered as part of the overall design.
The following design load combinations should be considered:
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emergency landing

.
helicopters at rest.

Both combinations should include appropriate serviceability requirements. Helicopter loads should be treated as imposed loads and applied together with other variable loads, permanent loads and environmental loads.
Under emergency landing conditions, local deformation of plate and stiffeners may be tolerated provided that the overall integrity and function of the helideck are not compromised. The designer should also give detailed consideration to the case where a helicopter becomes unserviceable (U/S) on the offshore helideck and there is no designated parking area for that helicopter.  The U/S helicopter is then required to park on the safe landing area of the helideck which will then encroach on the available safe landing area for making a recovery helicopter landing.  The designer should give consideration to the case where the design case helicopter is parked and recovery helicopter is required to land on the same helideck and develop suitable load combinations as part of the design exercise for the helideck. On completion of the design exercise, the information relating to the combinations of parked / recovery helicopters shall be included in the Design and Operability Report.
　
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