Enhanced Culvert Inspections – Best Practices Guidebook

Culvert inspection is a key enabler that allows MnDOT to manage the state’s highway culvert system. When quantitative detail on culvert condition is required, an inspector will need to use enhanced inspection technologies. Enhanced inspection technologies such as; laser ring profiling, sonar, inclinometer, mandrel, hammer sound testing, core sampling, closed circuit television (CCTV), HIVE and JPEG mosaic testing, can measure or digitally record condition that would not be apparent from a simple visual inspection. In general, MnDOT should balance the higher cost of conducting an enhanced inspection against the quality of data needed. It is estimated that simple end-of-pipe visual inspection costs $0.07/ft. Enhanced inspections range from $0.23/ft to $6.50/ft with higher cost inspections providing more detailed data. Estimates are developed using year 2016 unit costs. Best practices for each type of inspection are identified and presented in this guidance document. In addition, practical and logistic considerations are identified to assist staff in selecting cost-effective inspection methods for typical types of inspection. Types of inspection include: design-related, post-construction, condition and emergency / complaint-related inspection. Recommendations are presented to improve MnDOT’s enhanced inspection program. Recommendations include leveraging MnDOT’s laser ring inspection unit and increasing the use of MnDOT-developed HIVE cameras.

• Record URL:
  http://dot.state.mn.us/research/reports/2017/201716.pdf
• 
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/32633
• Corporate Authors:

  CDM Smith, Inc.

  7650 Currell Blvd.
  Suite 300
  Woodbury, MN  United States  55125

  Minnesota Department of Transportation

  Research Services and Library
  395 John Ireland Boulevard
  St Paul, MN  United States  55155
• Authors:
  • Youngblood, Doug
• Publication Date: 2017-6

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 125p

Subject/Index Terms

• TRT Terms: Best practices; Closed circuit television; Culverts; Inspection; Quality control
• Geographic Terms: Minnesota
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 01641112
• Record Type: Publication
• Report/Paper Numbers: MN/RC 2017-16
• Contract Numbers: 1002140
• Files: NTL, TRIS, ATRI, STATEDOT
• Created Date: Jul 17 2017 9:33AM