manhole size and constructubility

[Hidden_Brain]

I have a drainage system laid out which has quite a few manholes with multiple pipes coming in at various angles. I am looking to get some suggestions/recommendations on how to use the available tools to make determination how big a manhole needs to be based on the pipes coming in.

Typically, we try to have at least 6 inches of concrete in the inside wall of the manhole between pipe OD+2" coring. I have approximately 50 manholes like this. Is there any easy way to figure out based on incoming pipe angles, pipe dia and material (thickness) that I can make a determination on the manhole size?

I am interested to know how everyone is doing this? I appreciate any help on this.

[Jay_B]

This free MH size calculator might help.

http://www.cretexconcreteproducts.com/node/204

[Joe-Bouza]

Same line as Jay, Google and talk to your local precaster

[Joe-Bouza]

You definitely want to leave some meat on the bone

[Hidden_Brain]

Thanks for the link, I have something similar from a precaster. I am trying to automate/semi-automate getting the angles between the connected pipes out for the entire drainage network so that I can feed those in to a tool like this. Any suggestions?

[Matt.Anderson]

Hidden_Brain -

I think this should cover what you are looking for.  https://apps.autodesk.com/en/Detail/Index?id=3913582902813411430&appLang=en&os=Win32_64 

Its a well designed tool that I used very early on for a number of projects.  

[rpatrickVEJ49]

I know this is an old thread, but I had to check.

I used to have that cretex MH size calculator on my desktop, until our company servers got hacked and I lost it. The link you posted now goes nowhere, I think Cretex may have sold this division of their company? Anyways, do you know of anywhere else I could get this MH Calculator, or something similar? I've been searching online today with no luck.

[MattAndersonPE]

The

Create Structure Report

still is in the Autodesk App Store.

https://apps.autodesk.com/en/Detail/Index?id=3913582902813411430&appLang=en&os=Win32_64%C2%A0&_ga=2....