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2009-02-17 Seminar - Challenges In The Design And Construction Of Large Diameter Water Transmission Lines
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2009-02-17 Seminar - Challenges In The Design And Construction Of Large Diameter Water Transmission Lines

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Rafael Ortega, PE at LAN, discusses design issues, ROW concerns, technical specifications, and critical installation and constructability of large diameter water transmission lines.

Rafael Ortega, PE at LAN, discusses design issues, ROW concerns, technical specifications, and critical installation and constructability of large diameter water transmission lines.

Published in: Technology, Business

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  • 1. Challenges in Design and Construction of LDWM Presented by: Rafael Ortega, PE Lockwood, Andrews & Newnam, Inc. k d d
  • 2. Rafael Ortega, PE f Vice President Lockwood, Andrews & Newnam, Inc.
  • 3. Agenda Introduction Design Issues ROW Concerns C Technical Specifications Critical Installation and Constructability
  • 4. Design Issues
  • 5. Urban Environment Anticipating issues ahead of time Reducing unknowns Constructability Innovative solutions – How to do more with less funding
  • 6. Goal of Urban Project Minimize impact to traffic Avoid disturbance to adjacent structures Reduce surface restoration Limited staging or work area Avoid utility conflicts – Maintain services – Reduce outages – Avoid relocations
  • 7. Understanding “What it Takes What Takes” Project requirements Site visits – key to more complete designs
  • 8. Subsurface Utility Engineering Critical in an urban environment Increase contractors’ level of confidence – Design package gp g – Bidding – Construction
  • 9. Geotech Investigation Soil conditions vary along alignment Determine limits of soil variations Subsurface conditions impact: Sb f diti i t – Long-term performance of pipeline Long- – Specifications – Tunneling criteria – Construction claims
  • 10. Traffic Control Key to project acceptance by stake holders The more detailed the less disruption Optimize h i O ti i phasing: – Minimize duration of impacts – Provide for progressive transitions
  • 11. ROW Concerns
  • 12. Main Alternatives Greenspoint Mall IAH Airport Greens Rd. World Houston Lauder 4
  • 13. Route Evaluation Factors Limits of City jurisdiction ROW Acquisition Distinct Neighborhoods Di ti t N i hb h d Type of Construction Environment –DDevelopment type l – Contamination
  • 14. Easement Breakdown Aldine Easements Lauder Greens Bender Residential 37 26 8 Commercial 28 51 14 Undeveloped Tracts 14 27 21 TOTAL 79 104 43 Estimated structures impacted 2 5 0
  • 15. Public Coordination Businesses Bus routes School year Emergency access Special event traffic
  • 16. Technical Specifications
  • 17. AWWA Standards Minimum requirements Alternatives w/in standards Responsibility of specifier to address project issues
  • 18. Rigid vs. Flexible g Width of Trench – Practical Space Required – Larger Pipe = Larger Width All Pipe Not Created Equal
  • 19. All Pipe Not Created Equal p q Made to Order Material Mt il Properties – less fo gi ing forgiving Design Considerations
  • 20. Nonmetallic Materials PVC, FRP, HDPE PVC FRP Speed of installation Alternatives in stray current areas Alt ti it t Steel or DIP bends and outlets –V l Valves, fittings, and outlets fi i d l – Vertical and horizontal
  • 21. .
  • 22. Fusing Operation gp
  • 23. Pipe Comparison Summary Gasket Field Joint Pipe Corrosion Modifications Field Welding Bonding Pipe Material Design Joint Type Protection Allowed? Allowed? Req’d? Ductile Iron D til I R/F G Y Y N Y Steel F G or W Y Y Y Y or N FRP F G or W N Y N N Fused/ HDPE F Flanged N Y Y N PCCP R G or W Y N Y Y or N Bar Wrapped F G or W Y N Y Y or N F = Flexible R = Rigid G = Gasket W = Welded Y = Yes N = No
  • 24. Critical Installation and Constructability
  • 25. Challenges During Construction Pipe material availability Private utility relocations Competition for contractor’s resources Construction phased to C t ti h dt avoid impacting operations
  • 26. Construction Issues Verify densities of pipe bedding Lay pipe continuously Do t D not remove stulls prior to backfill t ll i t b kfill Perform internal inspections during construction
  • 27. Bedding Requirements g q Pipe Embedment – Bottom shaping – Compaction at haunches Movement of trench support Use of special embedment material (depth) Trench dams
  • 28. Backfill Critical Effectiveness of compaction critical – Loading capability – Deflection affects coating and linings E’ = Modulus of Soil – % Compaction – Type of Soil – Greatest Affect on Wall Thickness
  • 29. Improper Installation
  • 30. Proper Backfilling
  • 31. Joint Grout Mortar Spigot Lining Ring
  • 32. Closure Considerations Butt Strap – Requires true alignment – 12 wide w/ 4” minimum overlap required 12” 4 – Welding of prestressed wires Grouting Requirements gq – Wire mesh – Non-shrink grout Non- – Interior and exterior welds
  • 33. Butt Strap Butt-Strap Closure Piece Cl Pi Poorly Grouted P l G td
  • 34. Exterior Joint Grout Diaper; – w/ ethafoam backing – Width Installation – Grout mix and testing – Bottom joint recess (similar to bell form) – Rod and set time required q
  • 35. Ungrouted Exterior Joint
  • 36. Annular Space Issues p Flotation of Pipe Grouting Monitoring – M it i key Monitoring k – Pressure and volume – Potential exists w/ low-density grout low-
  • 37. Grouting Pressure Problems g
  • 38. Testing of Line Impacted by potential contamination from existing section Water discharge receptors – Capacity – Locations Schedule considerations – Fill rates – Required interconnects – temporary and permanent
  • 39. Unavoidable Change Orders Debris encountered in excavations Longer work duration Unanticipated services U ti i t d i – Active – abandoned
  • 40. Questions ?