Practices for Construction-Ready Digital Terrain Models (2021) / Chapter Skim
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From page 27... ...
27 Case Examples As noted in Chapter 1, follow-up case examples were conducted to gather further details on individual state use and perceptions of using DTMs in construction. The case examples were executed by phone or internet interviews between the research team and selected DOTs.
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28 Practices for Construction-Ready Digital Terrain Models DOT Benefits Challenges Lessons Learned Alabama • Calculating quantities • Learning with contractors • Federal aid to assist pilots • Setting expectations with contractors • Having sizable projects for equipment resource needs • Communicate early with contractors • Understand capability of contracting community Maine • Quick grade checks • Easy quantity comparisons with contractors • Time efficiencies • Software constantly changing • Legal hurdles (esignatures, stamps, plan set of record) • Equipment budget • Peer exchanges help share information with adjacent agencies and contractors they have in common.
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Case Examples 29 addressed the existing ground terrain model. Active construction is still underway on the pilot project.
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30 Practices for Construction-Ready Digital Terrain Models The process of requiring the contractor to survey, with the agency following closely behind, would have been beneficial to validate the technology as well as to create an opportunity for informal learning. As contractor and agency staff collaborate to create models, they can assist in troubleshooting and sharing effective practices that they can bring back to their respective organizations.
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Case Examples 31 4.2.2 Challenges The current barrier to further DTM use is MaineDOT's current effort to migrate to OpenRoads Designer (ORD)
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32 Practices for Construction-Ready Digital Terrain Models Another lesson learned was to take a similar number of location shots with the GPS rovers as the contractors do. In a project approximately 10 years ago, the contractor and MaineDOT had significant differences in quantities.
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Case Examples 33 to contractors during the letting. The previous process required a request of information; now it is standard practice to automatically provide the information.
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34 Practices for Construction-Ready Digital Terrain Models with some of the workflow challenges noted previously, will help facilitate further use of 3D in construction. This effort is ongoing and in conjunction with the state's contractor association.
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Case Examples 35 saw a 30% schedule savings through model use. Contractors that were early adopters had a competitive edge because of the efficiencies gained, which also put added pressure on the competition and hastened ODOT's move toward digital delivery.
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36 Practices for Construction-Ready Digital Terrain Models 4.5 Pennsylvania 4.5.1 Benefits/Motivation The Pennsylvania Department of Transportation (PennDOT) has an agencywide goal to go completely digital by 2025 through all phases of a project.
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Case Examples 37 surveying with AMG. It includes a provision that inspectors and field staff should receive 2 days (8 hours each)
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38 Practices for Construction-Ready Digital Terrain Models benefit of having contractors understand what goes into project design and the design process. A shared, mutual understanding of the work involved helps both parties gain an appreciation and collaborative attitude toward project delivery.
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