Attaching New Slab to Old Walls
Attaching New Slab to Old Walls
(OP)
Hi Guys,
I want to repair an old polygon shaped concrete manhole/vault that is 8' tall. The top slab is in a very bad shape as the rebars are exposed and corroded but the walls and floor slab are fine. I'v decided to replace the top slab by demolishing it and perform an in-place-pour or precast.
My question is....how do I attach the new slab to the existing walls? How do I deal with existing rebars in walls? Is precast preferable over in-place? I'll be using epoxy coded rebars in the new slab . Thickness for walls and slabs is one foot.
I appreciate any help in advance.
Thank you all
I want to repair an old polygon shaped concrete manhole/vault that is 8' tall. The top slab is in a very bad shape as the rebars are exposed and corroded but the walls and floor slab are fine. I'v decided to replace the top slab by demolishing it and perform an in-place-pour or precast.
My question is....how do I attach the new slab to the existing walls? How do I deal with existing rebars in walls? Is precast preferable over in-place? I'll be using epoxy coded rebars in the new slab . Thickness for walls and slabs is one foot.
I appreciate any help in advance.
Thank you all





RE: Attaching New Slab to Old Walls
RE: Attaching New Slab to Old Walls
thanks for your comments hokie66
RE: Attaching New Slab to Old Walls
Dik
RE: Attaching New Slab to Old Walls
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Attaching New Slab to Old Walls
the manhole is used for steam piping, expansion joints and anchors. the walls are in good condition, there is no exposed rebars.
RE: Attaching New Slab to Old Walls
How would you attach the preslab to the existing walls?
RE: Attaching New Slab to Old Walls
He can provide threaded anchors in the existing wall, through sleeves or pockets in the precast pannel. As the weight of cover shuld be adequate to stay in place, the fastening effort could be minimal. Using such scheme, helps future maintenance that may require uncover the manhole/vault.
RE: Attaching New Slab to Old Walls
The slab is reinforced and cast... and, formwork removed.
Dik
RE: Attaching New Slab to Old Walls
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Attaching New Slab to Old Walls
One thing about precast for this application is that I won't be able to level off top of existing walls so that the precast lid sit on them nicely.
RE: Attaching New Slab to Old Walls
RE: Attaching New Slab to Old Walls
If precast lid is the way to go, is there a waterstop product to be applied to the joint. I can't have water finding its way in the manhole.
The reason for the 1 foot thick slab is because the existing slab is 1 foot and also it's out in the roadway with only 2 feet cover but I would go with 10" slab to take some weight off walls.
RE: Attaching New Slab to Old Walls
RE: Attaching New Slab to Old Walls
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RE: Attaching New Slab to Old Walls
Richard A. Cornelius, P.E.
WWW.amlinereast.com