BIM HEATHROW TERMINAL 2B
The T2B phase two team
Client: Heathrow Airport Limited (Formerly BAA)
Complex-build integrator: Balfour Beatty Group
Architect and lead consultant: Grimshaw Architects LLP
Structural engineer: Mott MacDonald
MEP engineer (scheme design): WSP
The visualisation for the client (main picture) is based on the building information model
MEP engineer: Balfour Beatty Engineering (Parsons Brinkerhoff)
MEP BIM Modelling: One Point Design
ICS consultants: Balfour Beatty ICS Acoustic engineer: Parsons Brinkerhoff
Fire Engineer: Exova Warrington
design for phase one using 2D MicroStation, with the structure and mechanical, electrical and plumbing (MEP) being developed in 2D with elements of 3D coordination. During production design and construction, 3D modelling was used for coordination and fabrication by the contractor, fabricators and suppliers. Phase two, however, proved to be substantially more demanding in terms of coordination due to the construction of the substructure, the design of the complex services and the safeguarding required for the Tracked Transit system, an underground railway linking the pier with the main terminal and future satellite piers. Balfour Beatty decided to build the substructure and
superstructure concurrently, using ‘top down, bottom up’ construction, to substantially reduce the design-and-build programme. The combination of build complexity and
a tight programme led the design team to review the lessons learned from the construction of phase one and delivery of Terminal 5, and implement a fully coordinated Level 2 BIM model in 2009. This proved to be a steep learning curve for the design team at a time when design protocols and BIM execution plans were in their infancy in the UK.
Design of T2B phase two At options and scheme design stages – which relate to Royal Institute of British Architects
(RIBA) Stages A to D – a 3D model was developed alongside the 2D drawing process using AutoCAD Architecture 2009. The model formed the basis for coordinating the structural design, as well as providing the framework for issuing any design documentation. It also allowed the team to review design strategies and test the exporting of drawing information. MEP design, at this stage, was a combination of 2D CAD information and localised 3D studies, but it was not integrated into the 3D modelling process. Opportunities for early-stage model coordination therefore required separate workshops to identify constraints and coordination.
June 2013 CIBSE Journal 41
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