Planning to cut open a 36"x36" hole in my concrete slab to repair an
underground PVC sewer line. I have no idea if the repair is to be just at
the break, or I need to replace a longer section that may be pitched back
due to the break. I will be hiring a plumber to come do the repair.

For the concrete cutting I will be hiring another company to come do it. I
assume when I cut through the slab there will be either wire mesh or rebars,
when I finished the plumbing repair, I will need to redo the mesh right?
Will the concrete saw make a clean cut? If so how do I tie back another
mesh? Do I need to drill holes in the slab "sideways" to expose the mesh or
rebars?

If I do not replace the mesh, I think the weight of the concrete slab will
eventually settle on the PVC pipe and that's bad.

One more thing, I understand when they install PVC pipe to ensure proper
slope they install "hangers". How can hangers be installed when you are
doing it from above and the concrete slab is not even poured?

TIA,

MC

You don't say what loads are to be imposed on the slab.
A qualified engineer would have to decide some of the issues you raise
As a general answer, I usually see the old slab edge drilled to accept
steel reinforcing dowels that are anchored to the existing slab with
epoxy and poured into the new slab.
TB

wrote in message
oups.com...
You don't say what loads are to be imposed on the slab.
A qualified engineer would have to decide some of the issues you raise
As a general answer, I usually see the old slab edge drilled to accept
steel reinforcing dowels that are anchored to the existing slab with
epoxy and poured into the new slab.
TB


The area is currently in the middle of the kitchen and will remain so after
the repair. No load except for foot traffic.

MC

Since you seem to be concerned about the new slab dropping and exerting
pressure on the pipe, consider small reinforcing bars that essentially
span the opening. Welded wire mesh adds little to the spanning capacity
of the slab. Hangers would be placed and the new slab poured around the
upper ends.
TB

The area is currently in the middle of the kitchen and will remain so
after
the repair. No load except for foot traffic.

And a refrigerator moved around. Don't forget about how heavy those can be.

In alt.home.repair on Sun, 31 Jul 2005 21:09:15 -0400 "miamicuse"
posted:


wrote in message
roups.com...
You don't say what loads are to be imposed on the slab.
A qualified engineer would have to decide some of the issues you raise
As a general answer, I usually see the old slab edge drilled to accept
steel reinforcing dowels that are anchored to the existing slab with
epoxy and poured into the new slab.
TB


The area is currently in the middle of the kitchen and will remain so after
the repair. No load except for foot traffic.

And an occasional rolling of a new refrigerator in or the old one out.

Or a piano through the back door.

??

MC



Meirman
--
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"meirman" wrote in message

And an occasional rolling of a new refrigerator in or the old one out.

Or a piano through the back door.

??

Still a pittance compared to a driveway for trucks. I'd use some mesh
though.

In alt.home.repair on Mon, 01 Aug 2005 02:19:25 GMT "Edwin Pawlowski"
posted:


"meirman" wrote in message

And an occasional rolling of a new refrigerator in or the old one out.

Or a piano through the back door.

??

Still a pittance compared to a driveway for trucks.

True, but I also forgot my mother-in-law.

I'd use some mesh
though.



Meirman
--
If emailing, please let me know whether
or not you are posting the same letter.
Change domain to erols.com, if necessary.

"miamicuse" wrote in message
...
Planning to cut open a 36"x36" hole in my concrete slab to repair an
underground PVC sewer line. I have no idea if the repair is to be just at
the break, or I need to replace a longer section that may be pitched back
due to the break. I will be hiring a plumber to come do the repair.

For the concrete cutting I will be hiring another company to come do it.
I
assume when I cut through the slab there will be either wire mesh or
rebars,
when I finished the plumbing repair, I will need to redo the mesh right?
Will the concrete saw make a clean cut? If so how do I tie back another
mesh? Do I need to drill holes in the slab "sideways" to expose the mesh
or
rebars?

If I do not replace the mesh, I think the weight of the concrete slab will
eventually settle on the PVC pipe and that's bad.

One more thing, I understand when they install PVC pipe to ensure proper
slope they install "hangers". How can hangers be installed when you are
doing it from above and the concrete slab is not even poured?

TIA,

The support for the repaired pipe section will be the soil on which it
rests. It should be thoroughly compacted. Likewise, the main support for
the new section of concrete floor will be the soil on which it rests -- same
as for the original floor. Be sure it is also thoroughly compacted. The
backfill should be appropriately dampened and well tamped. Take a look at
excavation repairs on the public streets. It's the same general procedure.

SJF

"SJF" wrote in message
news:Ai9Se.73804$DW1.23740@fed1read06...

"miamicuse" wrote in message
...
Planning to cut open a 36"x36" hole in my concrete slab to repair an
underground PVC sewer line. I have no idea if the repair is to be just
at
the break, or I need to replace a longer section that may be pitched
back
due to the break. I will be hiring a plumber to come do the repair.

For the concrete cutting I will be hiring another company to come do it.
I
assume when I cut through the slab there will be either wire mesh or
rebars,
when I finished the plumbing repair, I will need to redo the mesh right?
Will the concrete saw make a clean cut? If so how do I tie back
another
mesh? Do I need to drill holes in the slab "sideways" to expose the
mesh
or
rebars?

If I do not replace the mesh, I think the weight of the concrete slab
will
eventually settle on the PVC pipe and that's bad.

One more thing, I understand when they install PVC pipe to ensure proper
slope they install "hangers". How can hangers be installed when you are
doing it from above and the concrete slab is not even poured?

TIA,

The support for the repaired pipe section will be the soil on which it
rests. It should be thoroughly compacted. Likewise, the main support for
the new section of concrete floor will be the soil on which it rests --
same
as for the original floor. Be sure it is also thoroughly compacted. The
backfill should be appropriately dampened and well tamped. Take a look at
excavation repairs on the public streets. It's the same general
procedure.

SJF

The mesh is to keep the slab from cracking, not to hold up the slab. A 3x3
section should be fine without any but you can throw mesh or pieces of
steel that you have around in the pour if you like. Rebar, angle iron,
whatever. The sawcutter will make a nice clean cut for you to patch.

CR