3D Digital Models as Highway Construction Contract Documents (2022) / Chapter Skim
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32 As noted in Chapter 1, follow-up case examples were conducted to gather additional details on individual state DOT uses and their perceptions of using 3D digital models in construction. The case examples were executed by web interviews between the research team and selected DOTs.
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Case Examples 33 New York Utah Policies • 3D digital models are the controlling legal document in projects that use 3D digital models as contract documents. • Using the 3D digital models simplifies the process of requesting information and enhances project inspection, especially that New York State DOT staff are equipped with tablets that provide real-time access to data.
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34 3D Digital Models as Highway Construction Contract Documents 4.1 DOTs That Use 3D Digital Models as Contract Documents This section presents the input of DOTs that use 3D digital models as contract documents. 4.1.1 New York State DOT New York State DOT started providing digital information and 3D digital models for contractors almost 15 years ago.
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Case Examples 35 4.1.1.1 Policies When conflicts arise in New York State DOT projects, 2D plans tend to take precedence as the legally controlling document, followed by specifications and then the 3D digital models provided as supplemental information. However, in the two projects that use 3D digital models as contract documents, the 3D digital models are the legally controlling documents, followed by specifications.
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36 3D Digital Models as Highway Construction Contract Documents 4.1.1.4 Lessons Learned for New York State DOT The transition to using 3D digital models as contract documents requires staff preparation and the engagement of the contracting community. New York State DOT provides its staff with high-speed internet, tablets, and proper survey equipment.
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Case Examples 37 3D digital models were being developed on some projects, the DOT still had to produce plan sets, which resulted in putting more effort into the preconstruction phase. In addition, Utah DOT pays contractors on CM/GC projects an hourly rate for their time and involvement in the preconstruction.
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38 3D Digital Models as Highway Construction Contract Documents 4.2 DOTs That Provide 3D Digital Models for Information Purposes Only This section presents the input of DOTs that provide 3D digital models for information purposes only. 4.2.1 Michigan DOT Michigan DOT trained its design staff in 2012 on 3D digital models and started providing them as reference material in 2014.
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Case Examples 39 Thus, training should allow all parties to understand and feel the benefits of using 3D digital models to create a culture of continuous learning and keep everyone updated on the latest technology and constantly adapting to change. 4.2.1.3 Motivation to Use 3D Digital Models as Contract Documents AMG is an area where Michigan DOT and the contractors are in sync with 3D modeling, so Michigan DOT can start by making AMG models contract documents.
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40 3D Digital Models as Highway Construction Contract Documents 4.2.2.2 Training Wisconsin DOT noted that design model standards and design software training are already available for project development. However, additional standardization and training are still needed to ensure that designers, consultants, construction staff, surveyors, and contractors coordinate effectively and the data is exchanged as expected.
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