Metal culvert repair with reinforced concrete lining/pavement

[AraEng]

Hello,

I'm trying to find documentation on the requirements for repair of metal culverts with concrete lining or pavement in the state of Maryland. Unfortunately, I can't seem to find any document that discusses the requirements or procedure. I've looked into regulations of other states and many of them refer to FHWA - Culvert Repair Practices Manual Volume II which according to FHWA website is archived and no electronic version of it is available. What the governing document now? Am I looking at the wrong place? Would anyone be able to direct me to the right direction please?

Thanks,

 

[JStructsteel]

Have you checked with a plate/concrete structure manufacture? They do relining, etc.

 

[MotorCity]

For the repairs, can you just match the same concrete thickness and reinforcing that is in the existing liner?

 

[AraEng]

jrisebo: I'm trying to avoid that.
MotorCity: The existing culvert is made of corrugated metal but has experience extensive damage at the bottom.

DOT of California has provided proper literature and detail for repair of such damage to metal culverts. I've attached their sketch here. However, I need something in the federal level to refer to, as it seems that state of Maryland doesn't provide it.

 

[JGard1985]

Not a plug but I would recommend Centripipe.

Its a spray-cast concrete application system that basically sprays concrete grout (with fibers) onto the walls. They have a really good design manual that you can use to help size the required thickness for your structural repair. Application works by building up thickness over several passes.

I sized repairs on three 14' diameter CMP culverts that were severely deteriorated using CentriPipe

One drawback is they are new to some states and their DOT's but they have an applications engineer that will help put product in front of the right people to buy-in as a specialty structural lining

Jeff
Trenchless Rehab Engineer

http://www.xceed-eng.com

 

[SlideRuleEra]

AraEng - FHWA Culvert Repair Practices Manual - Volume 1 (but not Volume 2) is available in .pdf format. Note that the URL is incorrectly labeled Volume 2, but the document is Volume 1.

Also, look though this FHWA listing of Culvert Technologies to see if something else may be both available and helpful.

Perhaps FHWA Culvert Inspection Manual.

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[bridgebuster]

I looked through my files and found Volume 2 along with other items.

Also, this is a link from MNDOT

Link

Caltrans standard sheets for CMP invert repair (Scroll down to Section 17)

Link

I also plans for relining a CMP arch if you need them.

If all else fails, try calling Contech as well. They have products for culvert repair.

 

[AraEng]

Thank you so much. This is exactly what I was looking for and couldn't find online. Volume I doesn't have appendix B which is detail procedures for each type of repair. Volume II is what I needed. However, I'm a little confused as to why FHWA is not clear on substitution of this document. It is being referred to in almost every related state regulation and research report and yet they have archived this document.

 

[SlideRuleEra]

AraEng - Yesterday I sent an email to the Volume 2 custodian listed on the FHWA web page. If I can get a hard copy of the document will scan it to post on my website. Since it is a U.S. Government publication, copyright is not an issue.

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[Spartan5]

AraEng[/b], regarding Maryland specifically, I have seen the attached State Highway Administration detail floating around though I don't know from where it originated. They make extensive references to invert paving and lining on their website here (page 15):

https://www.roads.maryland.gov/OBD/OOS_Standards_List.pdf

But I've never been able to lay hands on official versions of those details. If you manage to hunt them down, please share.

Others, this topic is relevant to my interests (from a structural perspective). Invert paving requires "sufficient steel reinforcing [to] be installed and securely anchored to re-establish the structural capacity of the culvert to resist circumferential thrust loads." This is usually accomplished by welding studs to the crests of the corrugations.

The idea of relying on welding to this aged metal, in poor conditions, with coatings and other contaminates on the pipe has always given me pause. But others seem pretty unconcerned by it and just let the contractor loose with the standard detail.

It seems to me that this would be a critical connection, but it doesn't get the level of scrutiny that other things here in you folks structural world might get. In part I'm guessing it's because the consequence of failure is low from a public safety standpoint.

It seems like a decent 10, maybe 15 year fix; but longer term it doesn't give me warm fuzzies. Am I out in left field? Has anyone ever seen any failures of these repairs?