EVALUATING the IMPACT of OVERWEIGHT LOAD ROUTING on BURIED UTILITY FACILITIES By
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1. Report No. 2. Government Accession No. 3. Recipient's Catalog No. FHWA/TX-11/0-6394-1 4. Title and Subtitle 5. Report Date EVALUATING THE IMPACT OF OVERWEIGHT LOAD October 2010 ROUTING ON BURIED UTILITY FACILITIES Published: February 2011 6. Performing Organization Code 7. Author(s) 8. Performing Organization Report No. Edgar Kraus, Emmanuel Fernando, Eric Yingfeng Li, Jeong Ho Oh, Report 0-6394-1 Nicholas Koncz, and Cesar Quiroga 9. Performing Organization Name and Address 10. Work Unit No. (TRAIS) Texas Transportation Institute The Texas A&M University System 11. Contract or Grant No. College Station, Texas 77843-3135 Project 0-6394 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered Texas Department of Transportation Technical Report: Research and Technology Implementation Office September 2009–August 2011 P.O. Box 5080 14. Sponsoring Agency Code Austin, Texas 78763-5080 15. Supplementary Notes Project performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration. Project Title: Evaluation of Overweight Load Routing on Buried Utility Plant URL: http://tti.tamu.edu/documents/0-6394-1.pdf 16. Abstract Overweight traffic movements can negatively affect pavement integrity and quality. However, it is less known to what degree buried utility plant along and across the right of way is affected by these overweight loads, especially if the utility facility is aged, placed under an exception to the Utility Accommodation Rules (UAR), and/or subjected to repetitive loads. Routing decisions for repetitive overweight loads may be determined without consideration of cumulative impacts to utility infrastructure, particularly municipally owned lines that could be aged, accommodated under an exception, or of substandard materials. Given the growth in volume in overweight load (particularly mid-heavy and superload) permits, the adequacy of the UAR is unknown. This report focuses on the year one project objectives, which were (a) provide a review of technical design and engineering requirements for utility accommodation in Texas, (b) provide a preliminary assessment of potential impact of overweight loads on buried utilities, (c) provide a preliminary assessment of UAR adequacy to deal with overweight loads on buried utilities, (d) provide preliminary recommendations for a business process for TxDOT overweight routing coordination, and (e) provide recommendations for the phase 2 utility damage evaluation. 17. Key Words 18. Distribution Statement Utility Accommodation Rules, UAR, Underground No restrictions. This document is available to the Utility, Utility Damage, Pipes, Heavy Load Damage, public through NTIS: Overweight Load National Technical Information Service Springfield, Virginia 22161 http://www.ntis.gov 19. Security Classif.(of this report) 20. Security Classif.(of this page) 21. No. of Pages 22. Price Unclassified Unclassified 212 EVALUATING THE IMPACT OF OVERWEIGHT LOAD ROUTING ON BURIED UTILITY FACILITIES by Edgar Kraus, P.E. Associate Research Engineer Texas Transportation Institute Emmanuel Fernando Senior Research Engineer Texas Transportation Institute Eric Yingfeng Li Assistant Research Scientist Texas Transportation Institute Jeong Ho Oh Assistant Research Engineer Texas Transportation Institute Nicholas Koncz Assistant Research Scientist Texas Transportation Institute and Cesar Quiroga, P.E. Research Engineer Texas Transportation Institute Report 0-6394-1 Project 0-6394 Project Title: Evaluation of Overweight Load Routing on Buried Utility Plant Performed in cooperation with the Texas Department of Transportation and the Federal Highway Administration October 2010 Published: February 2011 TEXAS TRANSPORTATION INSTITUTE The Texas A&M University System College Station, Texas 77843-3135 DISCLAIMER The contents of this document reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official view or policies of the Federal Highway Administration (FHWA) or the Texas Department of Transportation (TxDOT). This document does not constitute a standard, specification, or regulation, nor is it intended for construction, bidding, or permit purposes. The engineer in charge of the project was Edgar Kraus, P.E. (Texas Registration #96727). The United States Government and the State of Texas do not endorse products or manufacturers. Trade or manufacturers’ names appear herein solely because they are considered essential to the object of this report. v ACKNOWLEDGMENTS This research was conducted in cooperation with TxDOT and FHWA. The researchers would like to acknowledge the assistance provided by many individuals at these agencies, in particular the following: • Randy Anderson. • John Campbell. • Frank Espinosa. • Raymond Hutchinson. • Justin Obinna. • Guy Sledge. • Stephen Stakemiller. • Duncan Stewart. • Dean Wilkerson. • Charon Williams. The researchers also wish to acknowledge the support provided by Jerry Le with the analysis of the overweight truck routing data. vi TABLE OF CONTENTS Page LIST OF FIGURES ........................................................................................................................ x LIST OF TABLES ........................................................................................................................ xii LIST OF ACRONYMS, ABBREVIATIONS, AND TERMS ..................................................... xv CHAPTER 1. INTRODUCTION .................................................................................................. 1 CHAPTER 2. TECHNICAL DESIGN AND ENGINEERING REQUIREMENTS FOR UTILITY ACCOMMODATION ................................................................................................... 3 INTRODUCTION ...................................................................................................................... 3 UNDERGROUND UTILITY STRUCTURE TYPES AND MATERIALS .............................. 3 Underground Utility Structure Material Standards ................................................................. 4 UNDERGROUND UTILITY STRUCTURE CONSTRUCTION STANDARDS .................. 11 Embedment and Backfill ....................................................................................................... 11 Compaction ........................................................................................................................... 12 Casings .................................................................................................................................. 12 Depth of Cover ...................................................................................................................... 13 External Loads ...................................................................................................................... 13 REVIEW OF EXISTING PRACTICE FOR INSTALLATION OF UNDERGROUND UTILITY STRUCTURES IN TEXAS ..................................................................................... 26 City of Grapevine Water Utility Systems ............................................................................. 27 City of Grapevine Water Sanitary Sewer System ................................................................. 30 City of North Richland Hills ................................................................................................. 33 City of Fort Worth ................................................................................................................ 36 City of Bedford ..................................................................................................................... 38 Exxon Mobile Pipeline Company ......................................................................................... 39 ATMOS Energy .................................................................................................................... 40 REVIEW OF MILITARY SPECIFICATIONS FOR UNDERGROUND UTILITIES ........... 40 Introduction ........................................................................................................................... 40 Water Distribution ................................................................................................................ 41 Sanitary Sewers ..................................................................................................................... 51 Natural Gas/Liquid Petroleum Piping ................................................................................... 52 CHAPTER 3. DESIGN REQUIREMENTS FOR UNDERGROUND UTILITY STRUCTURES IN THE TEXAS UTILITY ACCOMMODATION RULES ............................. 59 INTRODUCTION .................................................................................................................... 59 CURRENT UTILITY ACCOMMODATION RULES ............................................................ 59 SUMMARY OF CHANGES TO UTILITY ACCOMMODATION RULES SINCE 1979 .... 63 Adopted Changes in 1982 (151) ........................................................................................... 63 Adopted Changes in 1989 (152) ........................................................................................... 63 Adopted Changes in 1990 (153) ........................................................................................... 67 Adopted Changes in 1996 (154) ........................................................................................... 67 vii Adopted Changes in 1997 (155) ..........................................................................................