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Definition of Modular Construction:
A resource efficient, off-site delivery method to construct code-compliant buildings in a quality-controlled setting. A report from the AIA states: The life expectancy of modular construction is the same as conventional, but modular construction is more ecofriendly than conventional construction. They spend significantly less on site time, and finally modular construction allow a building to be more readily
deconstructed and moved to another locationmplementation of BIM in Modular Construction:

Implementation of BIM in Modular Construction:

The extensive demand of pre project planning and coordination among members of cross-interdisciplinary professionals have significantly impeded the application of Modular Construction, with the recent development of Building Information Modeling these challenges could be overcome. The coordination and fabrication of the Mechanical, Electrical and Plumbing (MEP) systems in modular construction has always being one of the most challenging tasks encountered in the delivery process of modular constructions. The MEP coordination and fabrication process involves defining the locations for components of building systems, in where are often congested spaces, to avoid interferences.
Three primary reasons contributing to the challenges of MEP fabrication in modular construction:
First, the process is highly fragmented between design and construction firms. Second, the level of technology used in different coordination scenarios has historically varied significantly between engineers and construction contractors. Third, historically the process did not provide a model for use by specialty contractors plan prefabrication.
With BIM technology an accurate virtual model of a building is constructed with precise geometry and relevant data needed to support the procurement, fabrication, on-site installation activities. The implementation of BIM systems in modular construction normally involves in the following process:
� Visualization: ability to create a 3D presentation of building modules geometry, location, space, contained systems in relation to each other
�Modeling: ability to generate a 3D rendering tool to present the final product and finishes to owners, designers and constructors
� Code reviews: allows for building officials and fire officials could use the 3D models with related data for code compliance reviews
� Fabrication/ shop drawings: facilitates for the generation of detailed shop drawings could be easily produced once the BIM model is completed Communication: facilitates simultaneously creation of construction documents, product imagery, rapid prototypes, exterior envelope, interior finishing, and MEP fixtures of building modules. Through this single information platform, BIM promote collaborations among the design team, consultant, constructors and the clients.
� Cost estimating: provides for cost estimating, material quantifications, and pricing to be automatically generated and modified while changes are applied for each building module
� Construction sequences: provides a complete construction schedule for material ordering, fabrication, delivery and onsite installation of each building systems. With the integration of 3D rendering, 4 D (3D model + scheduling information) could be easily generated during the project design and construction phase
� Conflict, interference and collision detection: ability to determine building system interferences which can be visually presented. For instance, an air distribution duct for the HVAC system physically interfering with a concrete beam.
There are many locations in buildings that repeatedly cause coordination problems. These include building corridors, points of entry and exit, openings in shear walls.
The need for MEP coordination grows out of the lack of detailed design provided for fabrication and installation of building systems, and exists regard-less of the project delivery process used.