C+S March 2021 Vol. 7 Issue 3 (web)

Keeping up with innovation and increasing pro- ductivity in the wake of increasing costs, tight deadlines, and sustainability issues means the infrastructure industry must embrace digitiza- tion. Construction and engineering teams are increasingly pressured to implement modern technology, digital workflows, and connected construction practices. Together, these elements facilitate better communication and smoother hand-offs and, in turn, enable earlier problem detection and resolution, streamlined operations, and faster project delivery. Tunnel projects stand to greatly benefit from a connected construction approach that relies on a current, central source of truth about a project in which the digital world of modeling, imagery, mea- surement, and data is connected with the physical world of contractors, work crews, equipment, and the jobsite, at each phase of construction. Starting with pre-construction planning and con- tinuing through maintenance and operation, con- nected construction provides every stakeholder with the data needed to make well-informed deci- sions. From surveying and scanning to modeling andmonitoring, technology is making this possible. Constructible BIM with Parametric Modeling Automation and Digitization Enabling Informed Decision Making Throughout the Tunneling Lifecycle By Gabriel Neves

Grand Paris Express Project, L15B Tunnel. Eiffage project surveyors use Trimble robotic total stations to ensure the 3D constructible model is positioned and constructed properly.

detailers, and fabricators, as well as concrete detailers and manufactur- ers. A constructible model can combine digital terrain and survey data to quickly and efficiently develop complete tunnel designs and, with a solution that utilizes parametric 3D modeling, accelerates design, and decreases the potential for errors. With advanced BIM solutions that allow for parametric modeling, pa- rameters are defined for the modeled objects, determining how those objects interact. This builds intelligence and eliminates the need for multiple inputs of the same data. A parametric model is automatically updated with any revision. Based on defined parameters, the effects of any change to a design are automatically populated throughout the

Despite the vast efficiencies that come from digital modeling, tunnel design, and construction largely rely on 2D drawings and workflows. Given their geological complexities, the design, analysis, and con- struction of tunnels demand very careful coordination across many disciplines, including civil, geotechnical, structural, MEP, and drain- age, which is a challenge with traditional 2D methods. For complex tunneling projects, constructible BIM provides an accu- rate, dynamic, and data-rich 3D environment that can be shared across disciplines including architects, contractors, structural engineers, steel


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