Summary 7/11/2012. Michigan Water Environment Association 2012 Annual Conference Boyne Mountain Resort

Transcription

1 Michigan Water Environment Association 2012 Annual Conference Boyne Mountain Resort June 25, 2012 Thomas Gossiaux, PE (AECOM) Matt Raysin, PE (GCDC-WWS) Dave Barnas, PE (AECOM) Ed Tharp, PE (AECOM) Summary Project Background Why Rehab? & Alternatives Bid Project Concerns What is CIPP Lining? Construction Setup, Lining/Curing, Demob Time Criteria Project Hiccups 1

2 Project Background 72-inch RCP sanitary sewer interceptor installed to collect several aging sanitary sewer pump station and service additional area. Installed interceptor had high infiltration and evidence of structural failure, which was not solved through grouting. Alternatives were bid to fix this issue. Why Rehab? 2

3 Why Rehab? Why Rehab? 3

4 Proposed Alternatives Alternative Low Bid High Bid CIPP (Composite) Lining $4,720,220 $5,561,870 CIPP (Fiber/Felt) Lining $4,055,140 $5,790,420 Slip lining $5,519,810 $9,605,350 Parallel Tunnel $6,578,700 (only bid) *CIPP Composite Liner was $665,080 more than CIPP (Fiber/Felt) Liner, but selected due to increased strength and reduced thickness. Benefits of CIPP Composite Bid was less expensive than slip-lining and parallel tunnel Lighter/thinner and stronger than traditional felt CIPP Liner Reduces infiltration and exfiltration (no pipe joints) Protect pipes from corrosion Minimal traffic disruption/social costs vs. open-cut Increase flow capacity 4

5 Pipe Comparison RCP CIPP (composite) CIPP (fiber/felt) Sliplining (Hobas) Design Flow 61 MGD 61 MGD 61 MGD 61 MGD Design Slope 0.05% 0.05% 0.05% 0.05% Manning's Roughness (n) Nominal ID Flow Capacity (Q) 61.2 MGD 71.6 MGD 67.6 MGD 55 MGD Project Specific Concerns Interceptor Size: 72-inch Interceptor (not a typical liner installation) Run Lengths: 1,200 to 1,400 feet per run Depth: 50-feet Water Table: 20+ feet of hydrostatic pressure Constructability Issues: Weight and stretching liner Over the hole wet-out 5

6 What is CIPP? Cured In Place Pipe Thermosetting resin is injected into a felt tube The tube is inserted into an existing host pipeline by water inversion The CIPP tube is cured using hot water Ends are cut and the final product is a fully-functional pipe-within-apipe Slide courtesy of: Water Inversion 6

7 Liner Technical Information Liner Thickness: ~1.4 (approx. 33 mills) Over the hole wetout Additional structural component Carbon Fiber Added strength with less thickness and weight Designed for Class 5 RCP equivalent strength Cured at ~180 F for about 12 hours Liner Layers Host Pipe Carbon Fiber Felt Layers Plastic Layer Sewage Flow 7

8 Liner Structural Member iplus Composite Slide courtesy of: 8

9 Preparation for Lining - Level Site Preparation for Lining - Mobilize Equipment Liner Brake Boilers Frac Tanks Inversion Structure 9

10 Preparation for Lining - Layout Liner Lining Operations - Begin Inversion 10

11 Lining Operation Begin Wet-out Lining Operation - Wet-out 11

12 Lining Operation - End of Wet-out Lining Operation - End of Wet-out 12

13 Lining Operation - End Inversion * Photo is not from Genesee County Project Lining Operation - Curing Liner 13

14 Lining Operations - Cut Ends Finished Product! 14

15 Time Criteria Prep For Lining: Level site around manhole: 4 hours per inversion MH Install water line: 4 hours Clean/TV: 2-4 hours (more if additional grouting is necessary) Grout major leaks (if necessary): 1-2 days End Seals: ~ 4 hours Equipment Set-up: 36 hours Total Prep Time: ~ 3-5 days (2-12 hour crews per day) Time Criteria (cont.) Lining: Wet-out/Inversion: 1-day (over the hole wetout ) Cure: 1-day Cut ends/clean edges: 1-day Total Lining Time: ~ 3 days Total Time Including Prep: ~ 6-7 days 15

16 Time Criteria (cont.) Demob/Cleanup: Tear down equipment: 1 day Total Demob Time: ~ 1 days Total Time Including Prep and demob: ~ 7 to 8 days Project Hiccups Curing issue in first liner length was due to water behind pipe. Some non-fully cured pipe bubbles required special resin to be injected to create a seal. Structural strength was not compromised. Finished pipe had some wrinkles If in flow path, ground down and sealed. 16

17 Bubbles and Wrinkles Summary Project Background Why Rehab? & Alternatives Bid Project Concerns What is CIPP Lining? Construction Setup, Lining/Curing, Demob Time Criteria Project Hiccups 17

18 Comments? Questions? 18