Concrete Encasement for service line

[Bijay99]

Hello Everyone,
I am assigned to design concrete encasement for sewer line of 450 dia.i have seen some guidelines for cover from all around the pipeline. But my question is, how can it be designed. Do we have to model as slab where load will be dispersed at angle transferring through concrete part to foundation, or as a beam?
Your answer will be highly appreciated.

 

[1503-44]

More information required.

Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[JoelTXCive]

Yes, I think we need more information.

Are you encasing the pipe all the way around? Or, just covering the top of the pipe?

If you are fully encasing the pipe, then.... Is the concrete encasement a true structural item; where you are creating a composite pipe/concrete section designed to carry load?

Or, is the concrete encasement a non-structural item for leak protection?

 

[Bijay99]

Yeah,encasement all around.
And yes it is a structural item where a length of pipe will be encased to protect from the load from the top. Thanks in advance.

 

[HTURKAK]

You did not mention for the pipe material and if the concrete encasement covers joints or not..

-If the encasement is for only pipe , you may design as per Marston formula . Have a look to Gravity Sanitary Sewer
Design and Construction ASCE Manual No. 60 ( by P.BIZZIER )


- If the encasement covers pipe joints ( such as , the pipe should bridge, overpass some utility, road etc) , in this case, the longitudinal reinf. should be calculated assuming the encased pipe is beam on elastic found. and you may develop FEM model...




I hope this respond answers your question..

Tim was so learned that he could name a
horse in nine languages: so ignorant that he bought a cow to ride on.
(BENJAMIN FRANKLIN )