How can I brick up a hole in a concrete pipe

[olofh]

I have a concrete pipe that has a hole approximately 15 cm in diameter.

I need to seal the hole so that the pipe won't leak water. Would it be possible to seal it with coarse concrete? I'm mainly wondering how to get it to adhere to the edges. I'm considering using something like a plastic mat as a backing on the inside, filling the hole, and pulling it outside something larger than the hole. What do you think?

 

[jonaserik]

What flows in the pipe? A photo is not wrong so the surroundings of the pipe are visible as well, what has caused the damage.

 

[olofh]

What is flowing in the pipe? A photo wouldn't be wrong so that we can see around the pipe as well. What caused the damage?

Sorry. No picture at the moment, but it's an old drainage well that captures water from 3 downspouts. The pipe stands straight down into the ground about 1m on some base plate.

The water comes in through 3 ceramic pipes. When the water reaches a certain level, it flows on to a well on the other side of the house. However, I have discovered that one of the three ceramic pipes lies lower than the actual drainage and, additionally, that particular ceramic pipe has broken a bit from the well, so now all the water flows out and not onward to the “real” well.

A bit tricky to explain. I need to plug the hole. I've rerouted the downspout to another well that was closer and of a modern type.

 

[jonaserik]

Then wrap plastic, (preferably construction plastic) tightly around the pipe, maybe 2-3 turns, and extend it about 10 cm past the hole on both sides. Then fill up with concrete underneath and build up around the pipe about 5 cm thick and out to the sides about 10 cm. The pipe should become like a cast on an arm. It's recommended to brush it clean a bit with a wire brush first. A little imagination is good; there's no pressure, so the tightness doesn't need to be 100%.

 

[olofh]

Then wrap plastic, (preferably construction plastic) tightly around the pipe, maybe 2-3 turns and going past the hole about 10 cm on both sides, then fill up with concrete underneath and build up around the pipe about 5 cm thick and out to the sides about 10 cm. The pipe should become like a plaster cast on an arm. It's a good idea to brush clean a bit with a wire brush first. A little imagination is good, there's no pressure so the tightness doesn't need to be 100%.

Great. I brainstormed a bit about using "syllpapp" as a "bandage" but construction plastic is probably better. How long does it take to cure? It's not a huge area and it will likely be about 5 cm thick as you say, do I need to keep it moist?

 

[jonaserik]

Just prepare and cast underneath and build up around, no water is needed on the concrete and it sets in 24 hours to be safe and becomes rock hard. If you want, you can lay a couple of thin iron rods over the hole between the plastic and concrete, some reinforcement so it doesn't sink in too much.

 

[olofh]

Just prepare and pour underneath and build up around, you don't need any moisture on the concrete, and it sets in 24 hours to be safe and becomes rock hard. If you want, you can lay a couple of thin iron bars over the hole between the plastic and concrete, a bit of reinforcement, so it doesn't sink in too much.

thanks. Just came in from a sloppy and poorly prepared casting, but we'll see tomorrow when it gets light how it looks. As long as it turns out right