Going forward, all the future rapid transit systems are instructed to mandate the adoption of BIM practices. We were asked to produce georeferenced 3D BIM models for constructions listed below and an elevated bridge to enable better control of inventory and avoid cost overruns.

Being designed to be the ‘Greenest Metro’, NMRCL decided to use the Design-Build-Operate methodology to control the usage of resources such as electricity, construction material, and manpower.

Opting to adopt BIM systems right from the design and construction level helped them to improve visualization, control costs, time, quality and safety for the Infrastructure improvement project.

Delivered detailed modeling of listed services at LOD 300, 350, and 400 using the CAD data given by the client. Though worked on various platforms to achieve fool-proof modeling, we made sure the delivered files are sent in Dgn format with transmittals for the ease of construction engineers and installation professionals to access.

Delay in data acquisition

Just like any massive venture that is first to implement BIM, we faced difficulties acquiring data from various sources. Most of the design architects, consultants, developers, and engineers are still following traditional methods to review, approve and transfer design data files. Due to delay in data revisions from multiple teams, our models suf-fered from many clashes and de- sign conflicts, which resulted in unplanned setbacks.

We have followed the Common Data Environment (CDE) as implemented by the client (NMRCL) for file management system including naming convention, etc. But not all the design consultants have adopted this system initially and using traditional tools and delivery systems made it very difficult to get the most up- dated/approved drawings to model in BIM. As soon as all the teams started adopting CDE central repository, the venture turned more workable.

Last minute design changes

As the viaduct of the Metro Rail goes over a national highway, there is a double-decker track designed as per the initial design files. Due to lack of real-time communication, we struggled with multiple structural clashes with many pillars positions in the design. It took a while to realize the reason is change of design from the architects isn’t reflecting in the created model.

Having a team of 20 GIS-BIM specialized personnel, we were able to rectify the situation and quickly re-model the whole section before the actual construction begun. This saved the stockholders from risking wrong construction and spending respective material and resources on it.