Companies are recognizing the benefits of an integrated geospatial and building information modeling (BIM) approach to design and construction. At Bentley‘s the Year in Infrastructure 2018 Conference in London, the winner of the Year in Infrastructure award in the Utilities Transmission and Distribution category applied BIM processes and reality modeling on a brownfield substation expansion project. The integrated approach enabled the organization to cut design time, minimize site visits, reduce land requirement and material waste, and, most importantly, eliminate change orders during construction.
This year's award winner, Pestech International Berhad, applied reality modeling and 3D modeling in the expansion of an existing substation located in a rapidly growing industrial area close to the largest airport and port in Malaysia. This was a brownfield project that involved adding 500-kilovolt capacity to an existing 275/132-kilovolt substation.
Substation design requires coordination between multiple disciplines, including site preparation, electrical design, mechanical design, protection design, and communications design. Traditionally, substation design involves a waterfall information flow consisting of CAD drawings and paper documents among the various disciplines. It is characterized by time-consuming, error-prone manual processes that make it difficult to correct errors, change designs, and keep everyone current with the latest documents. For a brownfield project, substation design also requires frequent visits to the site, which is hazardous and time-consuming. As a result of this fractured process, multiple submissions of the design are typically submitted to the client because of design errors. Often, the land area required for the site is overestimated and the bill of materials, which is generated manually in a time-consuming and unreliable process, results in material shortages during construction.
By automating the design process, the design time to complete the electrical drawings could be reduced from five to six months to one to two months. The bill of materials, which could require weeks to months to complete manually, could be generated instantaneously with much greater precision, reducing material waste and avoiding material shortages during construction. Clash detection could be automated, making it possible to detect clashes during design. For a brownfield project, compatibility with the existing structure can be ensured with the reality mesh, thus avoiding site visits. The combined reality and BIM model represented a single source of truth enabling all disciplines to stay current. In contrast to a waterfall information flow, a centralized 3D model enables different disciplines to work in parallel. The most important project benefit is that design errors could be detected and eliminated during design, rather than during construction. As a result, there were no rework orders due to design errors.
Reality modeling is the key technology contributing to this advancement. Reality modeling is the convergence of reality capture using 3D technologies, point clouds from LiDAR, and generating reality meshes from point clouds and digital photographs with BIM design. Geolocation plays a key role in integrating these technologies. Bentley calls this process geocoordination, and it makes it very simple to integrate data from diverse reality capture sources as well as to reuse existing engineering data together with 3D BIM design models. As I have blogged about previously, integrated geospatial and BIM is essential for a full lifecycle approach for managing infrastructure assets.
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