Wayne County s Rouge Valley Sewage Disposal System Sewer Lining Very Large Pipe MWEA WWAdCon

Transcription

1 Wayne County s Rouge Valley Sewage Disposal System Sewer Lining Very Large Pipe 2013 MWEA WWAdCon

2 Overview of Rouge Valley (RV) Sewage Disposal System and Short Term Corrective Action Plan Lining Considerations CIPP Sliplining w/ Hobas Presentation Outline Field Changes & Lessons Learned

3 Wayne County Rouge Valley (RV) Sewage Disposal System I-96 I-696 M-39 I-96 M-14 I-275 I-94

4 Wayne County Rouge Valley (RV) Sewage Disposal System Transports wastewater from 14 communities in Wayne County and 1 community in Oakland County to Detroit for treatment and disposal I-96 M-14 I-275 I-696 M-39 I-96 I-94

5 Wayne County Rouge Valley (RV) Sewage Disposal System 93 miles of sewer subdivided into two major interceptor systems which parallel the Rouge River I-96 I-696 M-39 First sewers built in the 1930s, with additions in the 1950s, 1960s and 1980s M-14 I-275 I in to 102-in 1,126 manholes; 27 siphons; 19 overflow structures I-94

6 Short Term Corrective Action Plan (STCAP) 2007 Wayne County completed a SSES and developed a STCAP Part of a Final Order of Abatement for SSO control Manhole Rehabilitation Regulator Improvements Improvements to LS1A Structural Sewer Lining

7 SSES & STCAP Sewer Lining Recommendations Sewers were inspected via CCTV using pontoon mounted cameras (1/3 of system) Found significant grade 4 & 5 structural defects from microbial induced concrete corrosion (MICC) 10 Interceptor segments were recommended for lining ranging in diameter from 48 to 102 Approx.. 10,000 feet

8 Lining Considerations HRC prepared construction drawings to implement STCAP recommendations 8 Lining segments were located in wooded floodplain / wetland / parkland 2 segments were located 50 below grade in major roadways (Ford Road M-153 and Oakwood Blvd.) Trenchless rehab techniques were a must given the interceptors locations

9 Lining Considerations Level of dry and wet weather flow control Access shafts to the sewer Loss of cross sectional area Construction footprint / environmental impacts Owner want to use reliable proven methods

10 Lining Considerations Each method has its own advantages and disadvantages impacting access requirements, environmental disruption, and flow control requirements Construction documents were developed to allow the contractor to chose from three types of sewer lining methodologies

11 Lining Considerations Structural panel lining requires manned entry to physically place structural glass reinforced plastic panels. Panels are fitted together and the annular space is grouted. Cured in place pipe (CIPP) uses a flexible tube impregnated with a thermo activated resin, which is placed using water inversion and cured to form a pipe within a pipe.

12 Lining Considerations Segmental slipling uses segments of new Hobas pipe which is inserted inside the existing pipe and then grouted in place. The contractor elected to use CIPP and Sliplining

13 Cured In Place Pipe (CIPP) Challenges: Access to sewers (woods & wetlands) Reach Lengths 300 to over 1,000 Liner Weight Flow Control Pre-Wetted 48, 60 & 66 Wet Out Over the Hole 78

14 Access Through Homeowner s Back Yard

15 48 Pre-Wetted CIPP Liner Minimal MH Modifications

16 Inverted liner with river water Boiler heats > 180 F to activate resin

17 Excess Liner Removed After Cured

18 24 to 36 hours invert, cure and cutout Minimal dry weather flow used inline storage and pump around for flow control

19 Wetland Restoration - Special seeds and special plants

20 Pre-Wetted 60 Diameter CIPP Liner Reaches >1,000 ft. Constructed Intermediate MH Reducing the length & weight Dry weather flow diverted to parallel interceptor

21 Pre-Wetted 60 & 66 Dia. Temperature & Humidity major consideration Started 3 to 4 AM

22 Pre-Wetted 66 liner brought to site in refrigerated truck

23 Tail of Pre-Wetted 66

24 Over the Hole Wet Out 78 Dia. CIPP Most difficult areas to access 5 reaches w/ lengths 400 to 690 Resin added on-site Install time 3-4 days around the clock NOT including site preparation

25 All Weather Access Road Geofabric, 1 x 3 topped w/ 21AA

26 Major manhole modifications to get liner to fit

27 Used a very cool saw to cut manhole down to springline

28 Oops, forgot we re in a wetland!

29 Forming new walls at access manhole

30 Pouring new walls at access manhole

31 Over the Hole Wet Out Set-up Inversion Roller Set-up over new access manhole

32 Catalyst-Resin Mixer w/containment Generator Inversion Power Roller

33 78 Tube on platform trailer

34 Vacuum hoses are used to help resin flow and saturate liner

35 Green hose is the resin supply to fill liner

36 Dye is added to resin to allow visual confirmation tube is fully saturated.

37 With tube fully saturated the liner is inverted, advanced, and repeated. 72 to 96 hours around the clock including cure, cool down and cut out.

38 Restored Wetlands

39 Slip Lining w/hobas Flush Joint Pipe 1, RCP w/ 72 Hobas 10 lengths RCP w/ 90 Hobas 6.5 lengths Corrosion resistant Gasket T/G joints Capable of direct burial

40 Mandrel used to verify new pipe will fit VERY Important!

41 Twin slide rail shoring access shafts used either side of manhole Manhole

42 Top of host pipe removed and new pipe inserted

43 Pulling ring connected and pipe winched into place

44 Pulling Ring

45 After installing gasket pipe is pulled home

46 Process repeated until sewer fully lined

47 Concrete closure being poured to seal host pipe

48 Annular space is filled with grout

49 Grout

50 Pre lining host pipe condition

51 Post sliplining

52 Field Changes & Lessons Learned 1. When slipling complete a sewer alignment survey to ensure pipe will fit (if possible in design) Contractor performed survey found several deflections Proposed using smaller pipe Shorter segments Additional inspections by the owner and engineer to evaluate other rehab methods

53 Field Changes & Lessons Learned 2. Walk large sewers, don t rely exclusively on CCTV Sewer conditions were not always as they appeared in the CCTV reports

54 CCTV Inspection Noted as Reinforcement Visible / Corroded Continuous Defects

55 Turned out to be form lines and staining in monolithic concrete tunnel sewer

56 78 RCP sewer originally called for 5 spot repairs over 3 manhole reaches

57 Spot Repairs using Link-Pipe PVC

58 What we found in construction were continuous grade 5 defects that warranted full pipe lining

59 The spot repairs were deleted and the most critical reach was sliplined

60 Field Changes & Lessons Learned The additional sewer inspections resulted in: Deleting 2 Sliplining segments 1,044 ft. 93-inch tunnel (Ford Rd.) 1,083 ft. of 102-inch tunnel (Oakwood Blvd.) Adding 2 Sliplining segments inch RCP (Woods/wetland) inch RCP (Ford Field - Dearborn City Park)

61 Field Changes & Lessons Learned 3. Look to use parallel sewers and temporary sewer balloons to minimize flow by-pass pumping

62 Middle Rouge River Ford Rd. M-153 Henry Ford Community College 78 Temporary Sewer Balloons and By-pass Pumping used to reverse flow in 78 8,500 ft., 13 feet of head U of M Dearborn Evergreen Rd. Fairlane Mall Lower Rouge River Michigan Ave. Rouge River

63 Field Changes & Lessons Learned 4. Allow lining options to the contractor Let each option compete on its own merits Provides competitive pricing Specify parameters but have contractor provide lining work plan with flow control details, access shafts, access roads to fit their selected lining option Maximize contractor knowledge and expertise

64 Field Changes & Lessons Learned 5. Pay attention to areas prone to MICC from turbulent flow including force main discharges, junction structures, and siphons MICC typically found above normal water surface

65 Microbial Induced Concrete Corrosion Niagara Falls Junction Structure 3. Sulfuric acid attacks the concrete turning into calcium sulfate (gypsum) 2. Biofilm forms above normal water line that consumes the hydrogen sulfide and produces sulfuric acid 1. Turbulent flow releases hydrogen sulfide

66 Middle Rouge River Siphon Ford Rd. M-153 Henry Ford Community College CIPP 78 Slipline 102 Slipline Junction with major drop Niagara Falls U of M Dearborn Evergreen Rd. Lower Rouge River Michigan Ave. Rouge River

67 Other Options Evaluated Spiral wound grouted in place liner systems

68 Spiral Wound Grouted in Place Liner Systems Thin sheet of PVC or HDPE is wound inside host pipe

69 Spiral Wound Grouted in Place Liner Systems A structural grout is pumped to seal the annular space.

70 Spiral Wound Grouted in Place Liner Systems Requires manned entry Minimal dry weather flow control No excavation for access shafts Greater cross sectional area loss as compared to CIPP Very new technology, very few experienced contractors Owner was not comfortable, wanted locally proven methods, not used

71 Project Team: Wayne County Department of Public Services Engineering and Operations: Kelly Cave, Razik Alsaigh, Firooz Fath- Azam, Dan Alford, and Ancell Noel Inland Waters Pollution Control, Inc.: Joe Fattore and Walter Rozycki Hubbell, Roth & Clark, Inc.: Bill Davis, Tim Sullivan and Eric Warner