Design and coordination Grimshaw’s architectural model was developed in 3D to a level that could be read at 1:50 scale while embedding intelligence into particular constructs, such as wall and door types. Any drawn information at a more detailed scale would be carried out by a 2D drawn overlay to prevent slowing the model down while in operation. ‘Tagging’ of the construction elements, within general arrangement and detailed drawing views, provided cross-references to the specifi cation and schedules. In addition to standard architectural drawings, the data-enriched 3D model provided scheduling of architectural elements and
Implementing a fully- coordinated Level 2 BIM model in 2009 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
provided the basis for visualisation renders. The majority of the MEP modelling occurred
during the production design stage. Balfour Beatty, alongside the engineering team, employed specialist 3D modelling company One Point Design to develop the 3D services model and embed intelligence into all the services equipment. As the model matured, it allowed the design
team to carry out detailed coordination of all construction packages. Individuals in the design teams were trained in the use of 3D navigation tools to allow checks of design intent, and weekly coordination workshops were held with all disciplines. Within the construction team, workshops
were held to mitigate against site clashes and identify coordination opportunities. Regular updates of the modelling constructs were provided by the design team at key stages. Furthermore, the use of a single coordinated 3D model allowed the team to address any impact that design development may have had on the disciplines involved.
42 CIBSE Journal June 2013 It is important to note that, while the model
was used for clash detection and coordination, the review, checking and sign-off process still relied on 2D drawings to track agreed design decisions as this proved to be the best method.
Prefabrication with BIM The use of the model had many benefi ts, among them access and maintenance reviews, cost-management and minimised waste during the build. The BIM model was used to see whether
Software used during
construction Architectural design and modelling: AutoCAD Architecture 2009
Structural modelling: Revit Structures 2011
Mechanical and electrical modelling: CADduct 2012
Coordination suite: Navisworks Manage 2012
Programming software: Primavera
each of the specifi ed areas (see box, page 44) were suitable for offsite prefabrication. Using BIM allowed the design team to see a greater level of detail, helping them minimise the physical size of the plant room while ensuring suffi cient space for access and maintenance. For example, when assessing
the transportation of plant, the schedules gave the structural load and weight distribution to assist with the sizings of the self- propelled modular transporter and the lifting requirements for the moving of the plant room across the apron to its fi nal position. As the prefabricated design developed,
the plant and equipment were defi ned and agreed with stakeholders. This information was embedded into the model and sent to the factory, where it was used for the creation of schedules, which were then issued directly to the suppliers for cost assessment and ordering. Prefabricated modules were built, tested,
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