Repairing sunken block paving

[ellal]

Have just built a front garden wall and the block paving needs repairing.

It will have mainly foot traffic in the area, but there may be times when a vehicle needs to stand there.

It had previously sunk a bit by thge old wall and drain.

Is it enough to level the existing MOT, put extra where needed, tamp down, and add the sand bed?

Or should I relay a whole new 100mm MOT base, then sand?

The rest of the drive is fairly even, so I don't want to have to do more than I need to, unless it would be better to re-lay.

Pictures below:

 

[JohnD]

It had previously sunk a bit by thge old wall and drain.

this happens when there is a leak turning the ground to mud or washing it away.

Perhaps you will be lucky and it was just badly laid.

 

[^woody^]

Most likely settlement from the foundation excavation. Tamp what is there down well, add sand to build up the levels and then lay the paving.

 

[ellal]

this happens when there is a leak turning the ground to mud or washing it away.

Perhaps you will be lucky and it was just badly laid.

The blocks moved because we removed the old wall against which they butted up to, and the new wall took a while to build. Walking on them caused the slippage

They were all in place beforehand, however there was existing sinkage in that area for which I suspect the main drain was to blame. The sides of the drain access were a bit suspect, and we shored it up before building the wall.

 

[ellal]

Most likely settlement from the foundation excavation. Tamp what is there down well, add sand to build up the levels and then lay the paving.

Same reply as above.

Plus I reinforced the bulging wall of the drain and put a concrete lintel into the cut slot at the bottom of this picture, as the original wall extended over that part of the drain.

 

[HERTS P&D]

You will need a drain camera inspection.

Andy

 

[ellal]

You will need a drain camera inspection.

Andy

We had that done a while ago, and the pipe itself is sound.

We did have a problem in that past with the drain backing up several times, but this turned out to be a blockage in the street end. We have no idea how long this was going on, but it is possible that this seeped through the unsound walls.

This is hopefully now sorted, as the water company did the remedial work their end.

Thus going on that premise (we have had no further blockages since said works), I am just looking for a way to put in a reasonable base.

If it sinks again, then no doubt I will be looking at an expensive digging up option.

 

[Ian H]

I'd clean the leaves out and bed them back on some grit sand. I bet you could a manhole lid with blocks in it too.