Unsure if this question is on the correct forum but would appreciate advice/guidance on this matter.
As part of recent building work, a 450mm inspection chamber has been fitted beneath my driveway - I'd estimate around 1.2 to 1.5m deep. The chamber cover is a plastic Hunter DS062. The problem I have is that the cover moves down whenever weight is applied. Using only my weight, the thing moves down by about around 10mm (estimate) at the edge. Having taken a close look, I can see it's not the cover distorting but the chamber structure it's screwed onto.
The driveway is crazy paved and the concrete all around the cover is, understandably, breaking up due to the chamber movement. I would hope this isn't the norm so maybe something isn't quite right with the way the chamber has been constructed or fitted? I should say that this movement has occurred since day one and it's far more pronounced at one point than others.
So my question is: what is supposed to stop this downward movement? Thanks for your consideration.
As part of recent building work, a 450mm inspection chamber has been fitted beneath my driveway - I'd estimate around 1.2 to 1.5m deep. The chamber cover is a plastic Hunter DS062. The problem I have is that the cover moves down whenever weight is applied. Using only my weight, the thing moves down by about around 10mm (estimate) at the edge. Having taken a close look, I can see it's not the cover distorting but the chamber structure it's screwed onto.
The driveway is crazy paved and the concrete all around the cover is, understandably, breaking up due to the chamber movement. I would hope this isn't the norm so maybe something isn't quite right with the way the chamber has been constructed or fitted? I should say that this movement has occurred since day one and it's far more pronounced at one point than others.
So my question is: what is supposed to stop this downward movement? Thanks for your consideration.