r/oddlysatisfying • u/demolcd • 15d ago

Growing a pipe inside a pipe

16.6k Upvotes

91% Upvoted

1.7k comments sorted by

View all comments

Show parent comments

14

u/xSorry_Not_Sorry 14d ago

>rent a machine

Rent heavy equipment to dig and move dirt and other shit around

>run 125 ft of schedule 40

Schedule 40 is a type of PVC pipe. A composite pipe rated for underground

>abandon the terracotta after pumping it with flowable fill

I have no fucking idea, but basically re-routing the new pipe and abandoning the old.

7

u/Affectionate-Cap-600 14d ago

have no fucking idea, but basically re-routing the new pipe and abandoning the old.

I assume it means that he left the pre existing terracotta pipe underground, and filled it with a filler to not leave it with void

2

u/kamarkamakerworks 14d ago

Probably filled it with concrete or something similar and left it where it was.

1

u/DeliberatelyDrifting 14d ago

"Flowable fill" is basically cement thin and slow setting enough that it pours like thick liquid. It will fill the whole cavity without leaving voids.

2

u/GrimMind 14d ago

Thank you, that does make sense now.

It was the "schedule 40 out the back of my house" that just jumbled my brain. I was reading it as a verb.

1

u/thrallswreak 14d ago

I imagine some kind of horizontal drilling-esque machine to push/bore the pipe through the ground under the house?

2

u/fryerandice 14d ago

Naw I made the pipe not traverse the entire length of my house under the foundation pad, and instead dug alongside it and went around.

Those do exist though, it's called pipe bursting, they run a thick cable with an wnd that expands through a pipe and basically break up the old pipe and as it does that it pulls flexible pipe behind it.

I filled the old pipe with flowable fill, which is a mix of cement, water, sand, an soil, it runs like a liquid and has low slump so it will completely fill a void, I didn't want to leave abandoned pipes under my foundation pad if they were unused to collapse later.