Settling PVC Pipe Cracked - How to Stop

How about a rubber boot to connect the two?

First of all, do you need 6” pipe? I don’t quite know the system that you are talking about, but can you replace with heavier wall pvc?

Could you replace with 2” Pex? That would be a lot more flexible.

If we are not talking about drinking water, the pipe would get a lot cheaper yet.

Dig it out, replace the fitting, and bed in cement stabilized sand. Google directions on a diy mix. Not sure why this still hasn't become the norm in residential construction it solves so many issues.

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You have a rainwater collection system with a 6” pipe is what you are saying? 6” pvc is pretty damn strong so you have some serious forces working on it to crack it, you need to fix that or it won’t. As said 6” seems overdone?

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My assumption is the 6" pipe is run underground to a catch tank. I assume the catch tank is above ground. So the 6" pipe probably has water in it at all times? Could be visualizing this totally wrong though. If it is a 6" pipe filled with water at all times, that's not going to be light, hence settling the settling. Likely need a pretty solid base of limestone or under the pipe before covering to assist in stopping that. Smaller pipe would help with the weight, but may hinder flow when it's raining, since a system as described is relying on hydrostatics to fill the catch tank and unless your house is on top of a hill, you don't have a ton of pressure working for you.

Is this Schedule pipe or S&D? sounds like S&D

40

It's schedule 40 and cracked in the thick part of the junction. Gonna have to bust the slab a bit to get to the upstream pipe. Pull a bunch more pavers.

This 6" pipe removes water from the roof and is a bit oversized due to the possibility of massive TX storms. Not sure how many inches of rain an hour it can handle but it collects 2k gallons/inch.

The designer/installer of the rainwater system has responded to me. Just want to make sure we properly fix the settling issue so this damn pipe can be buried once and for all. Right now, with the crack, it's dumping water from the roof right outside the front door. Paver drainage wasn't calculated with that in mind.

Does anything heavy go over the pavers? Looks more like the pipe wasn't buried enough and the weight on the pavers broke it over a settling issue.

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My assumption is the 6" pipe is run underground to a catch tank. I assume the catch tank is above ground. So the 6" pipe probably has water in it at all times?

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Yes & no. It is underground to an above ground tank. Weight of water in the downspouts pushes water up into the tank. The system is overbuilt but it works great when it’s not cracked.

The no part is the pipes are drained during dry spells. Stagnant water between rains is cleared out instead of going in the tank. Also don’t want mosquitos laying eggs and getting in the tank.

So the 6” pipe gets very heavy and then comparatively light. Still shouldn’t settle tho.

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Does anything heavy go over the pavers? Looks more like the pipe wasn't buried enough and the weight on the pavers broke it over a settling issue.

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No, the slab line marks the start of a covered front porch. Nothing heavy gets that close to the house.

Yes, 90 degree between the 6” downspout and 6” main line.

The crack is at the downstream end of the junction where the pipe inserts into the junction. In other words the junction cracked but the downstream pipe did not.

Hmm, something to talk to the installer about. He’s designed & installed many systems. Says this is the first time he’s seen this. Also getting a 2nd opinion.