Assessment of Construction Points for Grade Control and Reference in 3D
The objective of this research is to investigate the causes of inaccuracies of grade elevations from current practices and identify best practices for grade control and referencing on transportation infrastructure construction projects in Georgia. A nationwide questionnaire survey was conducted with contractors, engineers, surveyors, and owners, and the following causes of the discrepancies are identified: (1) long time gap between design and construction phases; (2) poor techniques in surveying; and (3) long interval between survey points. Through an actual case study with an ongoing highway construction project, the following conclusions and recommendations are made: (1) a mandatory field survey before earth moving is recommended; (2) unmanned aerial vehicle (UAV) and Mobile Mapping System (MMS) are effective for 3D grade control in planning and site cleaning phases; (3) terrestrial laser scanning (TLS) is appropriate for 3D grade control in a subgrade grading stage; and (4) robotic total station (RTS) is recommended for the final grading stage.
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Corporate Authors:
Georgia Institute of Technology, Atlanta
School of Civil and Environmental Engineering
790 Atlantic Drive
Atlanta, GA United States 30332-0355Georgia Department of Transportation
Office of Performance-Based Management and Research
Forest Park, GA United States GA 30297-2534Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Cho, Yong Kwon
- Park, Jisoo
- Publication Date: 2019-1
Language
- English
Media Info
- Media Type: Digital/other
- Edition: Final Report
- Features: Appendices; Figures; Photos; References; Tables;
- Pagination: 61p
Subject/Index Terms
- TRT Terms: Best practices; Case studies; Drones; Questionnaires; Referencing; Road construction; Surveys
- Identifier Terms: Mobile Mapping System
- Uncontrolled Terms: Grade control; Terrestrial laser scanning; Three dimensional grade control
- Geographic Terms: Georgia
- Subject Areas: Construction; Highways;
Filing Info
- Accession Number: 01704501
- Record Type: Publication
- Report/Paper Numbers: FHWA-GA-19-1618
- Contract Numbers: 0015155
- Files: NTL, TRIS, ATRI, USDOT, STATEDOT
- Created Date: May 7 2019 10:38PM