Division 1
Introduction
Purpose
The intent of this document is to provide standards and guidelines to promote consistent, uniform, and useable deliverables for all MDOT projects.
Overview
MDOT has adopted highly automated practices for surveying, design and implementation of projects. One of these practices is the utilization of 3D modeling for the development of model based electronic design data.
The concept of model centric design, and the generation of electronic design data for use in construction, involves the following key steps:
- Collection and development of geospatially located survey data for an accurate existing conditions model to be used for design, and also to be delivered for use in bidding on the project.
- Utilization of the survey model in design, with design software capable of 3D model output.
- Proposed output from design of critical electronic deliverables for use in bidding on and constructing the project.
- Utilization of electronic deliverables in constructing the project in an automated fashion.
- Field collection of as-constructed and inspection measurements and observations using modern positioning technology, relative to the engineered model data.
- Archiving and preservation of electronic model data for future use, including asset management.
FHWA has promoted the adoption of this technology through their Every Day Counts 2 initiative. According to FHWA, “Three-dimensional (3D) modeling in transportation construction is a mature technology that serves as the building block for the modern-day digital jobsite. The technology allows for faster, more accurate and more efficient planning and construction.â€*
Some of the realized benefits of 3D Engineered Models and Electronic Data include:
- Increased accuracy and data intelligence going into design
- Enhanced visualization capabilities during the design process
- Clash detection and mitigation is enhanced
- Greater ease of data from survey to design to construction
- Greater ease of design implementation at time of construction
- Enhanced quality of constructed facilities
- More accurate, consumable as-built data
- Data accessibility for future use
- '*U.S. Department of Transportation, Federal Highway Administration, EDC2 Website titled 3D Engineered Models http://www.fhwa.dot.gov/construction/3d/about.cfm