Hennepin County

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PROJECT QUESTION: The initial top detail on 3-M4 was technically accurate as the concrete collar properly distributes traffic loading to the sidewalls of the manhole. Internal gusset reinforcement is not required with the concrete collar installed between the manhole and the ring and cover casting. The detail on 3-M5 is of concern. If this detail reflected a similar design as 3-M4, there is no problem.

Question:
The initial top detail on 3-M4 was technically accurate as the concrete collar properly distributes traffic loading to the sidewalls of the manhole. Internal gusset reinforcement is not required with the concrete collar installed between the manhole and the ring and cover casting. The detail on 3-M5 is of concern. If this detail reflected a similar design as 3-M4, there is no problem.

Response:
Detail 3-M5 does call-out the frame and cover detail of 3-M4. It is the intent that all the MHs and MH inserts have the concrete collar.