Collapsing Driveway

[Ria777]

Hello,

I wonder if anybody has any thoughts on bricks that are collapsing on my driveway.

 

To give some background the driveway was relaid about 1.5 years ago. I believe they did a good job, taking the old bricks off and compacting ground underneath.

I notified them when this started to happen and they said that they would fill it in but believed there was a greater problem.

 

The reason I had the patio relaid was because a similar thing had happened and a few bricks at the side of the drive was sinking in, so I thought it might be as issue with the drive so I had it relaid.

The car is not parked in either area so there is no heavy use.

 

My only thought is down the middle of shared drive the gas pipe had to be dug up because there was a leak. This was about 15 years ago and I wondered if it was not filled in properly ao has caused a cavity or erosion under the driveway.

 

I think I am clutching at straws but cannot think of what it is or how to move forward with it.

 

Any advice would be most greatly appreciated.

Many thanks

Ria

[Dave Jones]

missing/poor sub base. The ACO channel really should have been concreted in as well.

 

If the build up didnt involve a good 6" of type 1 hard core it wont last.

[Ferdinand]

Insufficient drainage so it's going into the adjacent bit of driveway and washing away sub base?

[ProDave]

You need to take some bricks off and excavate in an archaeological fashion to determine at what level the ground has sunk.  It could be the aco drain is leaking and the top layer of sand has washed away, or it could be something deep down that has collapsed like previously made up ground, a collapsed drain, a leaking water pipe or just about anything else. 

[saveasteading]

As above is correct. And the use of tiny bits.

When replacing, it would be better to use one bigger piece, ie a single piece goes back in there, not 2 tiny cuts.

[Ria777]

Thank you all for your feedback.

I have something to go on now when I speak to someone.