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Concentric vs. Eccentric Manhole Cones

Concentric vs. Eccentric Manhole Cones

What is the purpose of a eccentric manhole cone versus a concentric manhole cone? When do you use either. Do you use a eccentric cone because steps need to be bolted into a vertical surface for climbing in and out?


RE: Concentric vs. Eccentric Manhole Cones

yes. Also, you can rotate to miss curb lines etc...

RE: Concentric vs. Eccentric Manhole Cones

Try climbing a ladder that's tilted toward you.

Mike Halloran
Pembroke Pines, FL, USA

RE: Concentric vs. Eccentric Manhole Cones

Don't put in steps. They rot over time and turn into safety hazards.

Richard A. Cornelius, P.E.

RE: Concentric vs. Eccentric Manhole Cones

All the steps I see in manholes are HDPE or similar.

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

RE: Concentric vs. Eccentric Manhole Cones

some agencies around here do not allow steps on sewer manholes. makes it too easy to avoid following the SWP which requires a fall harness and tripod

RE: Concentric vs. Eccentric Manhole Cones

Correct. The flat surface allows for placement of a ladder or manhole steps. The ladder is recommended to be frp or stainless steel construction for corrosion resistance.

Chris Eberly, PE

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