culvert repair best practices, specifications and special provisions best practices guidelines bruce...
TRANSCRIPT
![Page 1: Culvert Repair Best Practices, Specifications and Special Provisions Best Practices Guidelines Bruce Wagener, PE Eric Leagjeld, PE](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649c7f5503460f94935126/html5/thumbnails/1.jpg)
Culvert Repair Best Practices,
Specifications and Special Provisions
Best Practices Guidelines Bruce Wagener, PEEric Leagjeld, PE
![Page 2: Culvert Repair Best Practices, Specifications and Special Provisions Best Practices Guidelines Bruce Wagener, PE Eric Leagjeld, PE](https://reader036.vdocuments.us/reader036/viewer/2022062407/56649c7f5503460f94935126/html5/thumbnails/2.jpg)
Goals
• Provide guidance to MnDOT engineers in making better decisions on culvert repairs
• Provide guidelines, Special Provisions and Standard Details that will standardize practices and increase effectiveness and longevity of repairs
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Focus
Trenchless rehabilitation or repair of CMP and RCP culverts from 24 to 72
inches in diameter
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Outline
• Overview of rehabilitation, repair, and replacement
• Describe project tasks• Walk through the Guidelines
document• Special Provisions and Standard
Details prepared
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Definitions• Trenchless: Repair or rehabilitation that does
not involve excavating the roadway
• Rehabilitation: The existing culvert pipe is returned to its initial condition or better
• Repair: A maintenance activity that keeps the existing culvert in a uniformly good safe condition
• Replace: Removal or abandonment of the existing culvert by open cut or trenchless methods
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Project Tasks• Task A—Survey MnDOT, cities, counties, and
contractors• Task B—Survey of other state’s DOT’s• Task C—Research Synthesis: Literature review of
information provided in SP&R Work Plan, Tasks A and B, and other sources
• Task D—Best Practices Guidelines, Special Provisions, and Standard Details
• Task E—Feasibility Study: Recommendations for evaluating culvert rehabilitation and repair methods
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• Best Practices Guidelines
• Special Provisions• Standard Details
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Best Practices Guidelines
1. Introduction2. Culvert Repair Process3. Preparation for Rehabilitation or Repair4. Culvert Rehabilitation Methods5. Culvert Repair Methods6. Replacement using Open Cut7. Replacement using Trenchless Methods
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2. Culvert Repair Process
• Identify the Problem• Determine the Cause(s) of Deterioration• Evaluate the Structural Condition• Evaluate the Hydraulic Condition• Evaluate Repair, Rehabilitation, and Replacement
Options• Implement the Design• Maintain the Repairs
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Rigid vs. Flexible Pipes
• Rigid Pipe: Substantially self-supporting and relies on the surrounding soil for only a small fraction of its overall strength. (RCP)
• Flexible Pipe: Designed using soil structure interaction, where the majority of the pipe’s strength is derived from the quality of the backfill soils and compaction. (CMP, PVC, HDPE and fiberglass)
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Repair, Rehabilitation, and Replacement Options
• Inspect• Repair• Rehabilitate• Replace
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Repair and Rehabilitation Method Guidance
• Recommendations from suppliers, fabricators, or specialists
• HydInfra suggested repairs reports and flow charts
• FHWA Culvert Assessment and Decision-Making Procedures Manual
• FHWA Hydraulics Toolbox• Caltrans Supplement to FHWA Culvert Repair
Practices Manual
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HydInfra Suggested Repair Methods
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3. Preparation for Repair or Rehabilitation
• Environmental protection• Flow diversion• Infiltration control• Cleaning• Checking culvert clearance• Other preparatory work• Safety
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4. Rehabilitation Methods
• Paved invert• Cured-in-place pipe liner (CIPP)• Sliplining• Centrifugally cast concrete mortar
liner• Spirally wound liners• Close-fit liners• Shotcrete
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Paved Invert
• Use in CMP or RCP• Cast-in-place
concrete• Welded wire fabric
(WWF) or rebar reinforcing
• Anchored to existing culvert
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Cured in Place• Felt tube saturated with resin• Pull in place or inverted• Polyester or vinyl ester resins• Epoxy resins for special
conditions• Generally not bonded to
culvert
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Sliplining
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Centrifugally Cast Liner
• Cementitious or other material applied by an electric or air-powered rotating head
• Usually applied to CMP• Thickness controlled
by speed that the machine is pulled through the culvert
• Cementitious mortars discussed in Guidelines
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Spirally Wound Liners
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Close Fit Liners
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Shotcrete Liners
Placement of invert Completed liner
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5. Repair methods
• Spall repair• Joint repair methods• Filling voids outside the culvert• Joint sealing with internal packers• CMP seam repair• Invert plating• Sprayed coatings and linings• Slab jacking• Compaction grouting
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Spall Repair
• Repair spalls of concrete due to movement, freeze/thaw, structural distress, deicing materials, etc
• Personnel entry required• Similar to paved inverts
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Joint Repair
• Fix infiltration and exfiltration at joints to prevent ground loss and surface settlement
• Infiltration can lead to culvert deformation if soil support is lost
• Guidelines discuss personnel entry joint repairs
• Remote repairs are also possible
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Void Filling outside Culvert• Voids can develop due
to piping, joint infiltration, and invert erosion
• Special Provisions specify lightweight cellular or rigid foam hydrophobic urethane grout
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Other Culvert Repair Methods
• Joint sealing with internal packers• CMP seam repair• Invert plating• Sprayed coatings• Slab jacking• Compaction grouting• Resetting and retying end sections
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Other Important Features and Repairs
• Energy dissipators• Trash rack maintenance• Inlet and outlet protection• Aprons/cutoff walls
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6. Replacement of Culvert Using Open Cut Methods
• Drainage Manual• Standard Specifications and Special
Provisions• Standard Plates• Other MnDOT manuals
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7. Replacement of Culvert Using Trenchless Methods
• Conventional tunneling• Pipe jacking–Microtunneling– Auger boring
• Pipe ramming• Pipe bursting
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Rehabilitation Special Provisions and Standard Details
Method Special Provision Name Standard Detail NamePaved invert Paving Culvert Invert 3X02 Paved Invert Repair - Corrugated Metal Pipe
3X03 Paved Invert Repair - Reinforced Concrete Pipe
Cured-in-place pipe (CIPP)
Cured-in-Place Pipe Lining 3X06 Cured-in-Place pipe Liner - Corrugated Metal Pipe3X07 Cured-in-Place Pipe Liner - Reinforced Concrete Pipe
Sliplining culvert pipe
Sliplining Culvert PipeGrout Culvert Liner
3X04 Sliplining Culvert - Corrugated Metal Pipe3X04A Sliplining Culvert - Corrugated Metal Pipe 3X05 Sliplining Culvert - Reinforced Concrete Pipe3X05A Sliplining Culvert - Reinforced Concrete Pipe
Centrifugally cast liner
Centrifugally Cast Culvert Lining
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Repair Special Provisions and Standard Details
Method Special Provision Name Standard Detail Name
Spall repair Culvert Patching 3X03 Paved Invert Repair
Joint repair Repair Culvert Joint 3X01 Pipe Joint Sealing - Reinforced Concrete Pipe
Void filling outside the culvert
Filling Voids Outside of Culverts
3X08 Culvert Void filling Detail - CSP and RCP Culverts
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Special Provisions and Standard Details
Available by request from:Lisa Sayler
MnDOT Bridge Office Hydraulics 3485 Hadley Ave
Oakdale, MN 55128 Phone: 651-366-4468
Email: [email protected]
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Questions?