1

Sliplining and Other Culvert Repair OptionsKen Moulds, Subsurface, Inc.

October 5, 2016

A partnership with MDT, NDDOT, SDDOT, WYDOT and the Mountain‐Plains Consortium Universities TOPICS

• Slip Lining

• RCP Joint Repair

• CIPP (Cured In Place Pipe)

• UV Cure vs. Steam, Hot Water

• Soil Stabilization / Void Filling

• High Density Polyethylene (HDPE)• Polyvinyl Chloride (PVC)• Screw or Snap connections between pipe sections, depending on manufacturer

• Corrosion and Chemical resistant• Easy Installation• Smooth interior usually yields lower Manning’s number than host pipe

• High Flow characteristics• Cost Effective 3 4

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• What is the most common problem with RCP?– Broken joints– Separated joints

• What have we always done?– Dig it up, reset it or replace it.

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• A Separated joint is a RCP structure that has pulled apart as a result of freeze thaw cycles, vibration, piping, weakened bedding, poor installation, and decomposing filter cloths.

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• New technologies have created more options at less cost using a three step process.– Seal the joint from the inside with a combination of oakum rope and a highly adhesive, flexible polyurethane resin.

– Then seal the outside of the joint from the inside of the pipe with another flexible, adhesive, long lasting polyurethane resin.

– Replace lost soils and fill voids with yet another polyurethane product that is light weight, load bearing, highly expansive.

– All of which have a life expectancy of over 100 years.• This process can be done on structures 36” and above.

• What about box culverts that have sheared?18

• Recognize that you have options other than open cutting.

• You are not the first. Trenchless No‐Dig technology in surface transportation has come a long way.

• Time has shown us that most drainage structures that have been fully treated have a renewed life expectancy.

• Avoid Detours.19

• The spec must be understood by the engineer, the inspector, and the contractor.

• Each step must be performed in order.• Polyurethane resins have unique characteristics and are designed to function accordingly.

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Polyurethane ResinsIf cost does matter, then the temperature of the grout or resin matters!Controlling the temperature is important from storage to the point of injection.

Heated storageHeated drumsHeated hoses

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• Winter is a good time to work in wetlands and hard to get at sites.

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CIPP is a trenchless rehabilitation method used to repair existing pipelines. CIPP is a jointless, seamless, pipe‐within‐a‐pipe. It has the capability to rehabilitate pipes ranging in diameter from very small to very large (4”‐110”).• Each CIPP liner is specifically designed for each individual host pipe and location.

• Starts out as raw felt or fiberglass depending on cure type.

• Made to the thickness and diameter required by ASTM standards.

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• Sent to a wet‐out facility where it is impregnated with the resins needed for curing.

• The liner is either refrigerated if steam cured, or crated if UV cured to prevent premature curing.

• Shipped to site in appropriate trailer/reefer.• Installed and cured on site.• Does not bond to host pipe.• Designed to be a load bearing pipe if the host pipe completely degrades.

• Life expectancy of over 50 years.  40

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Questions to be answered in deciding on a solution:

• What is the “host?”  RCP or CMP?• Is the current pipe properly sized for the drainage area?• How will this decision affect the hydraulics of the culvert?• What is the depth to the invert?• What is the length and grade?• What kind of surface is above?• What is the traffic count?• How will the public be affected by the replace vs. 

rehabilitate decision?• How much will a detour cost?• How much right of way is there on each side?• Does cost matter?

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• Good option when hydraulics are important in the decision.

• In a RCP host you can maintain 100% of the existing flow rate, and in most cases gain a few points.

• Good for small diameter culverts.• Farming and Ranching community like it because of flow characteristics. 

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• Liner must be kept refrigerated to prevent premature curing.

• Shelf life is approximately 30 days if wet‐out liner has been kept at the proper temperature. 

• Insert liner into pipe and pressurize to obtain snug fit with host pipe.

• Cured by blowing steam into liner43 44

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• Liner must be kept out of the light, natural or artificial, to prevent premature curing.

• Can be stored at room temperature for up to 12 months.

• Wall thickness can be standardized.• Cured by pulling a “light train” with special UV light bulbs through pressurized liner.

• Temperature can be monitored and controlled throughout entire curing process.

• Extra material on the ends cut off with diamond tipped blade.

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• Host pipe needs to be cleaned, CCTV’d, and glide foil installed.

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• Liner is then pulled through the host pipe.

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• Liner is then pulled through the host pipe.

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• Carbon footprint is approx. 90% less compared to steam cured.

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• Liner inflated and UV Light Train inserted.

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Kenny@subsurface‐inc.com119 4th St. S 

P.O. Box 37, Moorhead, MN  56561Office: 218‐227‐5963Cell: 605‐838‐8384

Ken Moulds

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Transportation Learning Network

Contact InformationProgram Director

Tim Horner, P.E.Office: (701) 328-9859

Cell: (701) 391-9787timothy.horner@ndsu.edu

Technical Training SpecialistChris Padilla

Office: (701) 328-9867Cell: (701) 202-5730

chris.padilla@ndsu.edu

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