Modifying Grate Elevation on an Existing, Atypical, Structure

[fivestring]

I am working with a municipality to improve an intersection and a drainage issue at the intersection. At the intersection is an inlet with a frame and grate. However the structure is a large concrete box, almost like a septic tank, instead of a typical manhole structure. The frame and grate is inset into the top of the box and the top is exposed. I may be looking at raising the grate elevation a bit and back-filling the intersection shoulder around the inlet. I was wondering what might be the best way to go about that. I was thinking of maybe using a round-to-square adapter to place on top of the existing box but I don't know the best way to attach it to the box. I may be totally off with my idea so I appreciate any assistance.

 

[cvg]

most inlets I have seen are square, not round. why change?

 

[fivestring]

I'm not changing the size or shape; but I might have to adjust the elevation. I wish I could figure out how to attach a picture. It is like having a frame and grate embedded into the top lid of a septic tank. Thinking out loud here, maybe a way to adjust the grate elevation is to set rebar into the top of the structure and hand form a concrete riser for the grate to sit in.

 

[gbam]

Why remove grate build up with concrete and reset the grate to grade?

 

[Pinwards]

You may be able to find square adjustment rings that would work too, like those used for adjusting manholes and catch basins to finished grade. If the grate is a standard size this is more likely.

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[beej67]

Any reason you can't just use bricks?

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

http://www.campbellcivil.com

 

[fivestring]

Yep, bricks came to mind a while after I posted this. Thanks for all of your responses.