BIM HEATHROW TERMINAL 2B
BIM Timeline 2006 Design 2008 3D/4D SME T5
Manufacture and assembly
T2B Phase 2 T2B Phase 1 (RIBA C-D)
Scheme design
Production design
(RIBA E-F) 2010 2012
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Manufacture and assembly (RIBA E-F)
2D Architecture 2D MEP
2D Structure
3D Structure fabrication
3D MEP 3D Revit Structures
BIM Working Party Stratergy (May 2011)
Modelling
the prefab plant Prefabricated plant developed from the BIM model included: Primary intake plant room Suspended plant bulges Horizontal distribution Apron-level service modules Passenger tunnel services routes Vertical distribution Main intake riser Perimeter services risers
At the outset, it is essential to involve team members with knowledge of the BIM process and a clear understanding of the project’s goals, to ensure the modelling process is carried out strategically and resource is focused on areas that are of use to the project as a whole.
Scope gaps and suppliers information The level of detail you choose to model puts limitations on the BIM model’s capabilities for coordination. It is undesirable to model all elements of construction, despite the fact that these items could still have an impact on the coordination of the project. Examples of this might be raised fl oor pedestals and ceiling framing elements which, because of their repetitive nature, could slow down the modelling drastically. Similarly, in many cases, manufacturers
and suppliers do not provide 3D information to enable any coordination work to take place. Where it is provided, it is often at a later stage in development and it is not appropriate to embed the information and blur the boundaries of ownership. In procurement routes that involve supplier design elements, the detailed design ownership falls with the supplier, not the consultant. The embedding of this information into BIM modelling has yet to be fully developed. Secondary steel associated with cladding, for example, is often not available for coordination until after the primary services distribution has been defi ned. To avoid potential confusion, a clear set
44 CIBSE Journal June 2013
3D AutoCAD Architecture Scheduling 2D MEP
BIM OVERLAY 3D MEP
Navisworks coordination
Future stages 2014 2016
Schedule extraction
Implementation of BIM on Public Sector Projects (2016)
of design constraints and principles should be agreed by all parties at the outset and all disciplines should be mindful of the limitations of the model to portray the fi nal construction.
Conclusion The working practice developed through the design and coordination phases has proved invaluable and BIM implementation has been a great success. The opportunities afforded to the site team for testing prefabrication and onsite activities have not only improved effi ciency and quality, but also helped defi ne safe working methods and achieve best practice. The industry has moved on considerably
since the early days of using BIM at Heathrow. BIM execution plans now provide a structured framework for the exchange of data, ensuring the correct level of modelling is used and helping to defi ne each stakeholder’s responsibilities. Terminal 2B is due for practical completion
in October and areas of the building have already been handed over to end users. The model continues to evolve to provide information to the site team and, ultimately, will provide full documentation of assets to the client.
● ADRIAN TIMMINS MCIBSE CEng RIBA is an architect at Grimshaw Architects LLP and FRANK CONNOLLY was the MEP design manager for T2B at Balfour Beatty Group. This piece was reviewed by ALY DIAB, design and engineering manager at Balfour Beatty Group.
UK Government
4D Programming Fabrication Asset coding
Future development and operation
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