Concrete Floor Dropped?

[carlyai]

Another one of those jobs I'm getting Rountuit. This one is a bit more of a headache.

 

There used to be a huge clump of bamboo on the back right side of the block that we dug out, then filled and let settle for a couple of years. Then put down the slab and built the house.

Seems to have stopped now, but for the last few years that side of the house, just back right hand side has dropped. 

I suspect it's hollow under that part of the slab as when you walk on the tiles that cover the slab there's a drumming sound.

I don't think the pier has dropped just the cement around it.

Need some suggestions to go with my thought on how to tackle the problem. Thanks.

 

My thoughts are to force concrete under the house on the RHS into the gap, then wait to see what happens before I fix the walls. Just mix up strong batches in one of those black plastic tubs. Works well with the correct mix and not too much water.

Difficult to get a cement truck near that area.

The building mob said to use sand.

 

1. Inside the house back RHS pier and plaster crack.

 

 

2. Inside the house back RHS.

I don't think the building guys used any steel to anchor the airated blocks to the pier as well.

 

 

 

 

3. Outside the house on RHS corner.

 

 

4. Eves cracked, I think because wall has dropped, don't think the pier has dropped.

 

 

 

 

 

 

 

 

[Rampant Rabbit]

In Merica they do something called "concrete jacking"

[carlyai]

7 minutes ago, Rampant Rabbit said:

In Merica they do something called "concrete jacking"

Big messy job, but could come to something like that. Thanks

[GreasyFingers]

That is a big problem so the question is why it happened. Soil can subside but it is usually because of water. Is that corner well drained or do you have roof water dropping on it.

[carlyai]

5 hours ago, GreasyFingers said:

That is a big problem so the question is why it happened. Soil can subside but it is usually because of water. Is that corner well drained or do you have roof water dropping on it.

We have guttering. I'll check on the drainage.