Because the MEP (M&E) business worldwide continues to show to parametric 3D model-based constructing services design and coordination processes, the query of who does what between contractors and consultants has re-emerged. One of many challenges within the fashionable constructing services business issues the efficient control of BIM fashions between MEP Consultants and MEP Contractors.
BIM has many advantages together with: higher collaboration between stakeholders, improved design efficiency, much less constructability points on-site and value effectivity. Nonetheless, implementing BIM requires efficiently managing scope definition and supply in addition to the data move between the MEP (M&E) marketing consultant, the MEP (M&E) contractor, a number of sub-contractors and store fabricators. Nonetheless, BIM can create scope overlap (and subsequently prices and delays for the undertaking) between MEP (M&E) consultants, contractors and different downstream members.
Within the conventional system, the place 2D design information is obtained, the MEP contractor can be answerable for services coordination and conflict detection. He/she would overlay the 2D drawings of every of the services (HVAC, electrical, and plumbing) and carry out an in depth coordination train – normally by utilizing 3D instruments or by utilizing BIM instruments. The top outcome can be a model that’s spatially coordinated that may then be used for set up drawing creation and subsequent becoming/set up.
The standard strategy (2D drawing deliverables) didn’t require design consultants to consider constructability and spatial coordination. Nonetheless, the BIM course of requires MEP (M&E) BIM consultants to create clash-free 3D MEP fashions earlier than creating 2D design drawings for contractors to make use of. Because the marketing consultant can be handing over their BIM model (which is more and more conflict free and coordinated to some extent) he/she is in impact finishing up a number of the scope historically taken on by contractors. Nonetheless and extra importantly, the MEP model from the marketing consultant shouldn’t be all the time coordinated in the best way that the services can be put in or be value efficient for an MEP contractor.
Although the consultants’ BIM MEP model could also be clash-free and spatially coordinated with the architectural and structural techniques, the 3D model offered to the contractor by the marketing consultant could fall short because of quite a lot of causes similar to: I) procurement-led adjustments for supplies and tools; ii) it could not signify the precise set up course of or format; iii) the layouts will not be environment friendly i.e. permitting for too many bends and connections; iv) there will not be enough allowance for lagging; v) there will not be enough allowance for set up/hanging; and vi) there will not be allowance for entry for upkeep functions. In short, the marketing consultant’s 3D model could also be spatially coordinated however not enough for set up.
With out updating the BIM model to his personal becoming and set up necessities/requirements, the contractor is not going to expertise constructability points till within the area. At that stage it’s virtually too late to make too many adjustments and the set up will probably be compromised as a evaluation of the model and revised drawings at that late stage will virtually definitely create further prices and costs team4bim.com.
This extra work by the contractor is in impact repeating the modelling train (in addition to the drawing train) and is the important thing space of scope overlap and subsequently further time and value which can affect undertaking profitability and schedules.
To many observers, such an overlap defeats the aim of using MEP (M&E) BIM strategies. With extra time firstly of the method to outline the deliverables of every get together the scope might be lowered.
There are three options out there to the undertaking staff to keep away from scope overlap on this method. Firstly, the marketing consultant could create a BIM model however could not deal with making a coordinated or conflict free model. He/she would use the model to then create design drawings. This would offer the contractor with a model that’s not coordinated however with environment friendly routes and shops for services that may then be fine-tuned. This strategy would scale back BIM modelling time for the marketing consultant because it removes the coordination ‘headache’.
Secondly, he could create a 2D design as within the conventional non-BIM period. It will nonetheless enable BIM model creation by the contractor and subsequently undertaking’s want for BIM will nonetheless be served. This technique permits the contractor to create a coordinated BIM model utilizing specialist MEP coordination companies if wanted.
The third strategy is for the design consultants to make use of specialist a MEP coordination agency that understands and possesses ‘coordination for set up’ abilities. By using these abilities on the design stage the output is extra more likely to be extra helpful for the contractor whose position could then be to fine tune the model after which create drawings.
By managing MEP tasks utilizing considered one of these strategies scope overlap will probably be lowered and tasks will probably be extra successfully managed and delivered in the course of the pre-construction and BIM phases. The top outcome will probably be a achieve for shoppers and a extra optimistic and efficient use of BIM know-how to ship MEP BIM tasks.