1 / 42

Dahlia Ponds Tunnel Project Case History

Dahlia Ponds Tunnel Project . Presented By: Nathan Soule, PE, PG Brierley Associates & Brenden Tippets, Project Executive, BTrenchless. Dahlia Ponds Tunnel Project Case History . Dahlia Ponds Tunnel Project . Outline. Owner’s Approach Design & Engineering Construction.

cicada
Download Presentation

Dahlia Ponds Tunnel Project Case History

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Dahlia Ponds Tunnel Project Presented By: Nathan Soule, PE, PG Brierley Associates & Brenden Tippets, Project Executive, BTrenchless Dahlia Ponds Tunnel ProjectCase History

  2. Dahlia Ponds Tunnel Project Outline • Owner’s Approach • Design & Engineering • Construction

  3. Dahlia Ponds Tunnel Project Project Location

  4. Dahlia Ponds Tunnel Project Project Location

  5. Dahlia Ponds Tunnel Project Modified Design-Build • Denver Urban Drainage needed a new approach to tunnel construction • Past problems with O’Brian Canal Tunnel • Hired tunneling expert – Brierley Associates (Lyman Henn division) • Retained Qualified Contractor BTrenchless early on • Independent estimator – Bids must be within 10%

  6. Dahlia Ponds Tunnel Project Engineering • Evaluate feasible/allowable methods • Subsurface exploration with Contractor involvement

  7. Dahlia Ponds Tunnel Project Test Pits • Cobbles & Boulders • Groundwater

  8. Dahlia Ponds Tunnel Project Tunneling/Trenchless Methods

  9. Dahlia Ponds Tunnel Project Trial Horizontal Directional Drill • Multiple Attempts • Stopped by cobbles/boulders • Determined guided ram not feasible • Team decided on microtunneling for I-76

  10. Dahlia Ponds Tunnel Project Team Effort

  11. Dahlia Ponds Tunnel Project Project Purpose • BTrenchless completed one 240 LF microtunnel and one 60 ft rescue tunnel. • Design/build of two tunnels for storm sewer, including test pits of existing ground conditions. • 240 LF of 54” Tunnel to be completed without disruption of above I-76 highway. • 60 LF of 84” rescue Tunnel to be completed online and grade to match existing failed tunnel 30 ft below grade.

  12. Dahlia Ponds Tunnel Project

  13. Dahlia Ponds Tunnel Project

  14. Dahlia Ponds Tunnel Project Project Scope • Various construction methods used to account for the diverse ground conditions: • Microtunnel • Hand Tunnel • Sizes of the installed tunnels ranged from 54” to 84” diameter.

  15. Dahlia Ponds Tunnel Project Project

  16. Dahlia Ponds Tunnel Project Microtunnel Machine AKKERMAN Microtunnel Boring Machine SL 51 125 HP Head

  17. Dahlia Ponds Tunnel Project Microtunnel Machine

  18. Dahlia Ponds Tunnel Project Microtunnel Machine Akkerman MC-4 Jacking Frame

  19. Dahlia Ponds Tunnel Project Separation Plant DERRICK Separation Plant (3) FLC 2000 4-Panel High “G” Shaker Decks (1) FLC 2000 Mud Cleaner Hydrocyclone System

  20. Dahlia Ponds Tunnel Project Separation Plant

  21. Dahlia Ponds Tunnel Project Separation Plant

  22. Dahlia Ponds Tunnel Project Quantifying Material (Onboard Weighing System ) • Product Totals • Multiple Point Weighing • Split Weighing • Auto Target Function • Auto Tare Function • Error Alarms • Data Fields • Unit Conversion • Multiple Batching Modes • Tip-off Weighing • Zeroing • Auto Add Mode • Data Analysis • Remote Add Button

  23. Dahlia Ponds Tunnel Project Entry Shafts GME – Slide Rail System

  24. Dahlia Ponds Tunnel Project Exit / Entry Seal Microtunnel Inc. Entry Seals

  25. Dahlia Ponds Tunnel Project Generators 400 KW Generator 550 KW Generator (3) 75 KW Generators

  26. Automatic Bentonite Injection System • Dahlia Ponds Tunnel Project • MICROTUNNELING, INC.

  27. Dahlia Ponds Tunnel Project Dewatering System Ground water contamination treatment: (6) Weir tanks (1) Air Sparging 300 cfm (4) Mezzi air injection units

  28. Dahlia Ponds Tunnel Project Known Significant Challenges • Schedule • Purchase of Equipment- Short time frame • Shaft Construction • Contaminated ground water up to 2000 GPM • Shallow cover of tunnel under I-76

  29. Dahlia Ponds Tunnel Project Proposed Solutions

  30. Dahlia Ponds Tunnel Project Scheduling Successful scheduling- project completed 30 days ahead of original schedule. Provide the owner with feasible schedule in order to anticipate possible changes.

  31. Dahlia Ponds Tunnel Project Proposed Solutions

  32. Dahlia Ponds Tunnel Project Proposed Solutions

  33. Dahlia Ponds Tunnel Project Shaft Construction

  34. Dahlia Ponds Tunnel Project Proposed Solutions

  35. Dahlia Ponds Tunnel Project Contaminated ground water • Treatment of 2000 GPM system • Treatment of • Dissolved Manganese • Total Iron • Dissolved Iron

  36. Dahlia Ponds Tunnel Project Proposed Solutions

  37. Dahlia Ponds Tunnel Project Shallow cover • Slurry returning to the surface Install foam injection to stabilize face

  38. Dahlia Ponds Tunnel Project Completion of Work • Overall BTrenchless completed the two tunnels in 3 months, including all structures and appurtenances approximately 1 month ahead of schedule • Maintained good relationships with owner, engineers and the community, with little disruptions

  39. Dahlia Ponds Tunnel Project Lessons Learned • Think outside of the box (never accept “this is how we’ve always done it”) • Practice teamwork and adhere to advice from other industry leaders • Success comes from lessons learned

  40. Questions? • Dahlia Ponds Tunnel Project

  41. 9885 Emporia Street Henderson, Colorado 80640 110 16th St. #700 Denver, Colorado 80202 Phone: 303-469-0199Fax: 303-466-8309 www.BTConstruction.com Phone: 303-286-0202Fax: 303-286-1262 www.BTrenchless.com Phone: 303-534-1100Fax: 303-534-1777 www.lymanhenn.com

More Related