The 18 storey Kensington Royale Apartment Residence Tower is located in Sports City, Dubailand. Middle East Development is developing this 5 star, luxury, 252 room, apartment residence tower, that will provide guests and owners with top quality services and facilities. The developer was provided with 2D CAD drawings by the consultant.
Since only 2D CAD drawings were available, adding construction and quantity data to the project was not possible within the CAD system. Because of the lack of data, integration between the intended design and the different trades involved was not efficient. The developer was looking for a solution to get the accurate quantities in the early phases since the project was awarded as a Cost Plus contract.
Middle East Development decided to work with a BIM Service Provider for the creation of the BIM Model and the model progress (4D, phasing). Using BIM Processes and an Integrated Project Delivery approach, it was possible to progress the same model through 5 key stages of design, thereby improving the efficiency of the design cycle, retaining all orginal data and removing potential errors.
A brief sumary of the design activities carried out over the 5 stages is as follows:
1. Importing 2D DWG files and Creating a Mass Model
2D DWG files were imported into ArchiCAD (BIM Software tool) and used as reference drawings to generate the basic 3D geometry. In the first phase, a mass model was created with a Zone Tool to take the quantities of room area and volues, grouped according to the functions.
2. Creating the Preliminary Construction Model
Generic construction elements such as walls, windows and doors are added to the model. In this phase, the architect does not need to add detailed information to the model (such as finishes or the manufacturer of the doors and windows). Simple elements, which allows generic quanities, (such as surface of exterior walls or the number of doors used in the projects), to be taken, is enough for this stage to the design.
Exporting the architectural model as an IFC format at this phase would be the ideal BIM implementation, but given that the service provider was appointed as a BIM consultant late in the design development stage, the 2D DWG's were used as a reference buy the structural team.
The Architectural and MEP Models generated with ArchiCAD, were integrated through IFC format with Tekla's structural model to perform a constructability analysis.
3. Creating the Construction Model
In this phase, the model was updated with basic definition of the products and all the consolidated information from teh coordination review. The related components from ArchiCAD's calculation database were assigned to the construction elements to facilitate the analysis, planning and management of the building in a computerised enviroment.
The level of detail in this project phase was sufficient to allow the issue of building permits. Accurate sections, elevations and plan views can be generated directly from the model.
4. Creating the Product Model
The construction model was updated with the details of the chosen product. Manufacture and cost information was added to the existing construction elements.
The information entered was equivalent to that used by constructors and supplers.
5. Delivering the Maintenance Model
Construction is underway and ancy changes from the project design will be updated in the BIM model to reflect the as-built stage. The final BIM model will be deleivered to the Facility Management by the service provider. The availability of the as-built BIM model will optimise the operation of the building and efficiency of Facility Managers in terms of system maintenance reducing waste and improving sustainability.
The main benefit for the developer of using a BIM model, was the ability to generate accurate quantities at a very early design phase and to minimise the Cost Plus contract risks. Early identification of potential errors and early production of the shop drawings, such as rebar, means that the developer is continually able to analyse, plan and manage the project better.
Mr Munzer Hawwa, Project Manager of Middle East Developments stated "We have seen improvements in communciation and efficiency by following the IPD process. It has also identified and corrected potential errors at an early stage, ensuring that those errors do not impact on the costs of construction, it is impossible to evaluate what this process has actually daved the project in cost terms, but we have no doubt that we have seen a significant return on investment which has more than justified our decision to adopt IPD".
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