CSP Culvert reconstruction 1

[SMIAH]

A stream flow through 2x48 inches diameter corrugated steel pipes, since 31 years now. Since then and 5 to 6 times a year, there has to be a clean up made in front of them to remove debris and sediment.

They don't have the hydraulic capacity to pass a 2-year peak flow without a significant increase of the WSE upstream (as normal depth exceed the rise of the culvert).

So now, we're planning on a reconstruction with an increase of the diameter (dimension) of the culvert.

First, I was thinking about a concrete box but there is 25 feet of fill over the pipe and a railway over. The first layer of 10 feet under the ground is organic matter. Then a silty clay.

Now thinking about a CSP (Aluminized Type 2) or aluminium pipe.
with a diameter of +/- 10 feet.

I am definately now a fan of CSP - is there another option and should I really exclude the concrete box?

 

[SMIAH]

My concern about this option is the concrete footing in regard with the fill height and the very poor bearing capacity (which is probably something like 1500 psf).

 

[cvg]

steelguy - looks very much like the con-apan I recommended. quite popular and approved by several agencies now.

 

[Steeleguy]

The organic soils are trouble for most structures. I just checked my copy of the National Corrugated Steel Pipe Association design manual for fill heights on a 10' diameter CSP.

Height of Cover limits for steel pipe E80 live load (5" x 1") 10 gage steel is 54 feet. What is the length of pipe are you needing?

 

[Steeleguy]

cvg-did not need a crane to set, and small crew of four did the majority of the installation.

 

[SMIAH]

Bottomless Multiplate Arch > 2x price of the CSP...

 

[jeckysmith2]

Hey...I have no any idea about this thread. Please update me with useful information.

 

[SMIAH]

Useful? CSP has been recommended based on a price criteria and overall suitability for the site.

 

[beej67]

I suspect ole jecky might be a marketing robot.

Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East -

http://www.campbellcivil.com