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corrugated metal pipe under a building
thread507-226812 Forum Search FAQs Links MVPsForum
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(Structural)
(OP)
22 Sep 08 10:06My philosophy is not to place a building over an existing active corrugated metal pipe carrying storm water unless I encase the pipe in reinforced concrete. Is this being too conservative? My thinking is that the lifespan of the pipe is shorter than the building, so it must be encased to prevent deterioration and subsequent potential settling problems, even if the c.m.p. is strong enough or deep enough to prevent crushing. Is this typical practice for you other guys out there?
(Civil/Environmental)
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22 Sep 08 11:50storm drain pipes, encased or otherwise are rarely placed under buildings. If you must do it, don't use CMP - use something with watertight joints such as rubber gasketed reinforced concrete pipe, ductile iron etc. or put it in a casing pipe.
(Structural)
(OP)
22 Sep 08 12:00Yes, it's never a good idea if there is any way to avoid it. But I am asking about existing drains - not new. My first choice then is to rerout the drain so that it is not under the building - but what if the pipe cannot be re-routed. That's when I think the encasement is the best option. Would still like to have some other opinions, standard practices, etc.
(Civil/Environmental)
22 Sep 08 12:07exhaust your other options first including putting the building somewhere else. encasement is probably not the best option, what happens when the cmp rusts through? Are you going to rely on the encasement to convey the storm water? better to install a casing and then the drain pipe can be maintained in the future without disturbing the building.
(Structural)
(OP)
22 Sep 08 12:43The encasement would work like a concrete culvert if the cmp rusts through. How would you install a casing, and what kind of casing? I'm not sure this is as practical as just exposing the cmp and pouring concrete with reinforcing around it.
(Civil/Environmental)
22 Sep 08 13:00by practical, do you mean cheap and easy? Casing is definitely not cheap, but probably better protection than encasement. Unless you add quite a bit of steel reinforcement, your concrete encasement will become an unreinforced concrete pipe once the cmp rusts out. Without sufficient reinforcement it will also not be watertight.
remove the culvert, install the casing, backfill, place the drainage pipe in the casing and then build your building
(Structural)
22 Sep 08 20:40Quoting the OP
" encase the pipe in reinforced concrete"
It should work if designed adequately and I don't think it is too conservative.
(Structural)
(OP)
23 Sep 08 09:48Thanks for your advice and opinions. Nothing wrong with cheap and easy as long as it works! I have thought about inserting another pipe in the existing cmp (the geotech's suggestion), but I'm not sure how to specify this. Uncovering the pipe in sections and using reinforced concrete while keeping the pipe in service makes sense to me.
(Structural)
23 Sep 08 12:05In water treatment plants, we often run pipes under buildings using pipe encasements. Common practice is to design the pipe encasement as secondary containment, including waterstops. The encasement is designed to take the full building load, neglecting any contribution from the pipe.
I normally encase all pipes larger than 3 or 4 inches when they're under a building. I've encased pipes as large as 72 inches under buildings.
(Civil/Environmental)
25 Sep 08 22:37CMP has a life of 25-30 years. How old is it? If more than 12-15 years, relay with a quality pipe around the bldg. It can be done even if you go to a larger pipe. Who owns the pipe? What does it drain? What is going in the bldg? All these things have to be investigated. What happens if the pipe fails?
Richard A. Cornelius, P.E.
WWW.amlinereast.com
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These beveled ends are an ideal way to prevent scour at the inlet and “undermining” at the outlet while increasing hydraulic efficiency. When the ends of corrugated pipe are beveled or skewed to match the embankment slope, they will deliver the best hydraulic characteristics. Further, this style also provides for an attractive finish and is particularly cost-effective for large diameter culvert applications.
While the principal purpose of a beveled end finish on corrugated steel pipe culverts or spillways is hydraulic efficiency – other purposes may be to retain the fill slope, discourage burrowing rodents or improve safety. Pacific Corrugated Pipe can fabricate our beveled end sections to blend well with any surrounding. Typical beveled ends include full beveled (also known as a mitered end), SKU-Cut or a step beveled end.
The “step beveled” end fabrications have a small vertical cut at the very end, and also at the top of the end section. Our step beveled ends can be fabricated into a single or double-step beveled end. Also, our beveled ends are available in galvanized, aluminized and poly-coated metal finishes for a wide variety of corrosion resistance and improved durability.
It should be noted that these beveled cuts interrupt the pipe ends’ ability to develop ring compression and measures should be taken to prevent uplift when subjected to extreme hydraulic forces. The opportunity to customize ends to your specific application should be reviewed with your local Pacific Corrugated salesperson or directly with our manufacturing plant.
Contact us to discuss your requirements of Corrugated Metal Pipe Culvert Repair. Our experienced sales team can help you identify the options that best suit your needs.