City of Raleigh Neuse 72-inch Parallel Interceptor ...€¦ · 2014 Pole Camera Inspection Some...
Transcript of City of Raleigh Neuse 72-inch Parallel Interceptor ...€¦ · 2014 Pole Camera Inspection Some...
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March 27, 2018
City of Raleigh Neuse 72-inch Parallel Interceptor Condition
Assessment and Rehabilitation
Jim Perotti, PE CDM SmithBreanne Long, EI CORPUD
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Presentation Outline
Interceptor History Inspection Approach Condition Data Results Data Evaluation
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Neuse Parallel 72-inch Interceptors
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History
Transport 40 MGD South Interceptor - 1973 North Interceptor – 1998 Class III and IV RCP with a
coal-tar epoxy liner
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History
2014 Pole Camera Inspection Some sections installed in land
bridges (culverts laid in cut section, backfill, install pipe in cradles, minimum cover)
16-inch DIP Reclaimed water line installed between 72’s
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Inspection Approach
Manned-entry• 4 man crew
‒ 2 men in pipe
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Inspection Approach
Manned-entry• 4 man crew
‒ CCTV at entry MH
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Inspection Approach
Manned-entry• 4 man crew
‒ Forced air at exit MH
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Field Health and Safety Plan
Daily emails to project teamlocation/nature of work, weather outlook, status of lockout/tagout
Daily maps sent to Fire Dept • Work locations – road names,
manhole #s (address location not always available)
• Directions to nearest hospital
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Field Health and Safety Plan
Doorhangers• 72 hours in
advance
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Field Health and Safety Plan
Push Cart• 4 gas monitor, tools, 20
minute supply of air
CCTV monitoring WhatsApp
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Inspection Approach - Manholes
Pre-screening of pipe conditions and debris levels
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Inspection Approach - Pipes
Diameter laser measurements –at MH and every 25 feet
Pipe soundings every 10 feet Penetration tests
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Bypassing Efforts
Walnut Creek PS
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Bypassing Efforts
Battle Ridge
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Bypassing Efforts
Battle Ridge
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Hwy 50 Force Main
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Bypassing Efforts
Hwy 50
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Bypassing Efforts
Gravity Lines• 8-inch to 12-inch • Small trash pump with flexible hose • Allowed to enter 72
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Condition Assessment Findings
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Condition Assessment Findings
Modified PACP
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Condition Assessment Findings
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Effects from FM
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Cleaning Efforts
Last 4000 feet of each section contained up to 12-inches of debris
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Cleaning Efforts
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Cleaning Efforts
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Cleaning Efforts
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Cleaning Efforts
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Cleaning Efforts
Plant Influent Channel
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Structural Evaluation
Pipe wall type assumptions• Type A for Class III and Type B for Class IV• 1-inch cover to reinforcement
Max burial depths for each section
Road crossings encased
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Structural Evaluation
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Structural Evaluation
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Structural Evaluation
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Rehabilitation Alternatives
Alternatives Pros ConsPotential Bypassing
Needs
Estimated Cost (based on 18,000')
Slipline (FRP) Little DisruptionInstalled in Ex. Flow
Reduced Capacity,Intermittent size
changesNone $600/LF
Open Cut (FRP)
Full CapacityFully Structural
Lengthy Disruption,Land Bridge & Major
Road X-ings
Full 72" bypass $700/LF
CIPP Little DisruptionMaintain Capacity
Not Fully Structural in all reaches,
On-site WetoutNone $1,100/LF
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