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SAS 03-23-2009 11:42 AM

cement truck over sewer line
 
I'm looking at pouring a slab in my backyard. I recently dug in a 4" schedule 40 sewer line that connects to the cast iron main - also in the backyard. It connects at about 4 feet underground and the run of the sewer line gradually rises from that 4 feet to about 18".

My question is whether it is safe to drive a cement truck over this connection and new sewer run. The cement truck would drive over the Ell connection to the cast iron main. It's 4 feet underground and we backfilled and tamped as best we could, but there is still inevitable settling that will take place. The truck would also drive over some of the 4" pipe at a place where it is about 24"-30" deep.

Do you think this is OK? The concrete guys do, but they're also looking for the easiest way to get the job done.

Thanks for the advice.

porchmonkey 03-23-2009 01:10 PM

If your pipe was properly bedded, backfilled, and compacted you should be OK.

47_47 03-23-2009 01:15 PM

You could put down planks over the pipe to distribute the trucks weight.

kenmac 03-23-2009 03:00 PM

IMO I wouldn't risk it.. It may take a little longer but, There are other means ( machinery) to get the concrete to the area

Bob Mariani 03-23-2009 04:15 PM

They do not look for the easiest way, he is just giving his opinion as we do here. 2-3' is not very deep. You do not know the soil conditions or compaction. I would not chance it. Power wheel barrows are great for this work

Scuba_Dave 03-23-2009 04:24 PM

How wide was the trench?

AJ&J 03-23-2009 05:47 PM

Compaction and soil conditions are everything. I crushed a 10 foot section of Schd 40 at a 4 ft depth where the ground was a little soft. I go with the person reccomending the planks for weight distribution.

Bondo 03-23-2009 06:17 PM

Quote:

I go with the person reccomending the planks for weight distribution.
Ayuh,... A few sheets of 3/4" plywood would go along ways,... Cheap Insurance....

SAS 03-24-2009 07:50 AM

width
 
Quote:

Originally Posted by Scuba_Dave (Post 248968)
How wide was the trench?

About 12", but at the point where the connection was made it was a 3' x 4' foot hole about 5 feet deep.

SAS 03-24-2009 07:52 AM

wood
 
Quote:

Originally Posted by Bondo (Post 249019)
Ayuh,... A few sheets of 3/4" plywood would go along ways,... Cheap Insurance....

Do you think that that would hold a fully loaded cement truck? I was thinking 2x10s...

47_47 03-24-2009 08:27 AM

I too was thinking 2x material. I would NOT let the truck drive over the connection hole, just lay the planks perpendicular to the trench.

This is my opinion only, ultimately it is your decision.

4just1don 03-24-2009 09:00 AM

2x planks will snap like a toothpick to even a half full cement truck. Better find some bridge plank material. 'Here' that would entail finding where the county crew took out an old bridge lately and reclaiming a bunch of old used stuff. A double layer would not be too much,,and it better be on hard level surface,no holes or voids under neath. recently dug up soft dirt WILL collapse under truck weight if its damp. has it rained in the last two weeks?? Your 2X material MAY work to run a manuel wheel barrow on. If its A LOT of cement get a pumper ,,,but costs are going up quick!!!

Bob Mariani 03-24-2009 10:14 AM

I've tried to use 2X materials and several sheets of plywood moving cement with my skid steer bucket and it still will snap these materials. Like you said it is your opinion that counts and it is you that has to hear about the yard smell to your neighbors after you break the sewer line.

47_47 03-24-2009 10:57 AM

SAS,

I just re-read the entire thread and I missed Bob's first post about not knowing the soil conditions and compaction. Sorry for my misinformation.

I would not chance it.

SAS 03-24-2009 12:15 PM

That's a good idea,
 
Quote:

Originally Posted by 4just1don (Post 249398)
2x planks will snap like a toothpick to even a half full cement truck. Better find some bridge plank material. 'Here' that would entail finding where the county crew took out an old bridge lately and reclaiming a bunch of old used stuff. A double layer would not be too much,,and it better be on hard level surface,no holes or voids under neath.

That's a good idea, but then I also have to have a fairly heavy truck to haul that material in...

Quote:

Originally Posted by 4just1don (Post 249398)
recently dug up soft dirt WILL collapse under truck weight if its damp. has it rained in the last two weeks?? Your 2X material MAY work to run a manuel wheel barrow on. If its A LOT of cement get a pumper ,,,but costs are going up quick!!!

It rained a week ago. The deepest section is fairly shaded as well. It's probably still damp down there.


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