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BIM HEATHROW TERMINAL 2B


quality-checked, pre-commissioned and stored offsite so they could be delivered just when they were needed.


Fabrication and construction Adding a timeline to the BIM model allowed the design and construction teams the opportunity to ‘look into the future’. Using Navisworks linked to Primavera programming software, the team was able to visualise the construction at a point in time. The use of the model and modularisation optimised the effectiveness of the installation while removing safety issues, such as working at height.


Benefi ting from 4D The 4D model was used to simulate a view of the work area and any overlapping working zones in a real time view. It enabled the team to see what a particular work area should look like on any given date. This was then compared with what it actually did look like on that day, demonstrating the accuracy of the model. As a result, the team was able to manufacture


certain elements early, safe in the knowledge that those elements could be incorporated into the building. For example, the team knew that, through 4D modelling, the prefabricated plant areas could be transferred overnight from the hanger (where they had been built) and lifted into position, all in one day. The use of the visualisations taken from


the model linked to Primavera, not only allowed the project team to look forward but also retrospectively, which was particularly important from a site safety perspective.


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As an integral part of the Balfour Beatty Group


‘zero harm’ policy, the 4D model was used to predict potential safety issues, which were scheduled and managed out. It was also used to identify why any actual incidents occurred, so that lessons were learned for the future. In addition, workshops were held on a weekly


basis looking two and six weeks ahead. These were used to identify potential issues that could affect the delivery time, and space reports – showing spatial arrangement of elements on site – were developed in advance of works starting.


Lessons learned Heathrow Terminal 2B has provided many lessons to the design team about the implementation of BIM on large-scale projects. The establishment of BIM workfl ows, the unfamiliarity of the tools and the complexity in meeting the client’s exacting BIM protocol requirements, presented the design team with considerable challenges along the way.


‘BIM mindset’ and resourcing It is vital to understand that a building information model is ‘built’, and is not just a graphical representation of design intent. For this reason it is essential that, from the outset, there is suffi cient experience in the design team to understand the consequences of design decisions on coordination and integration. The team must also be trained to understand that information is embedded within construction objects that may be critical to other disciplines and design processes.


June 2013 CIBSE Journal 43


The real-time view in the building information model allows the team to see work areas on any particular date


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