ZEMCH 2015 - International Conference Proceedings | Page 286

Collaborative planning meetings were carried out with the participation of the research team and
project stakeholders to create an execution plan for each phase. The aim of those weekly meetings was to review and update the schedule of the retrofit process. Figure 3 illustrates a visual plan
that was collaboratively produced at the site office.

Figure 3: High-level construction schedule
Three 4D models were devised in Phase 1A. The first model was developed as a starting point for
the execution of Phase 1A and was based on initial collaborative planning meetings and on guidelines provided by suppliers. The original plan was affected by restrictions found on site, such as
delays in the delivery of the windows and absence of design details. As changes in the construction schedule occurred, these were incorporated and simulated in the second 4D model, taking
into consideration the constraints and interferences found in the execution of House 6 (Phase 1A).
Screenshots were generated from the second 4D model of House 6, were presented to site manager, and were displayed as a panel on site, as presented in Figure 4.

Figure 4: Retrofit work plan produced from screenshots of a 4D model
The role of those visual devices was to support the site manager to devise and update production
plans at the collaborative planning meetings. Later, the third 4D model was developed considering the how the retrofit process was effectively undertaken in practice.

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ZEMCH 2015 | International Conference | Bari - Lecce, Italy