Pipes through brick inspection chamber

[Peter500]

I am adding a 110mm non-return valve for my soakaway and want to build an inspection chamber for it as it's supposed to be inspected periodically. I looked at plastic options but couldn't see what I needed. Pipes usually stop at inspection chambers but I want this one to pass through, with the valve in the middle. How should/can I 'seal' around the entry holes? I know concrete can damage pipes as it expands/contracts, but I also know a lot of people use concrete. Can I just put mortar around the pipe entries? The pipes are PVC.

btw. the reason for the non-return valve is because I have a rainwater harvesting tank and I don't want the dirty soakway water flowing back into my tank. I have a high water table so it's likely that the water level in the soakaway will exceed the height of the rainwater tank overflow.

 

[Ian H]

I would dig under the pipe, fill with concrete then drop some plastic risers onto the concrete (trim the bottom one at each side to fit over the pipe). Probably a 450mm if it shallow.

 

[Peter500]

I would dig under the pipe, fill with concrete then drop some plastic risers onto the concrete (trim the bottom one at each side to fit over the pipe). Probably a 450mm if it shallow.

The pipe isn't there yet so I don't need to dig under it. It's also possible to fill the chamber with pea shingle if the pipe needs support. I was also thinking of putting a water pipe and electrical cable through the chamber, but that would be a pain if it was covered in pea shingle.

 

[Hugh Jaleak]

I know concrete can damage pipes as it expands/contracts, but I also know a lot of people use concrete. Can I just put mortar around the pipe entries? The pipes are PVC.

Pipework need some wiggle room to allow for movement, when laying concrete or VC pipes, a short 'Rocker' pipe is used immediately outside the chamber, (then a full pipe), to provide 2 joints in quick succession to allow for this movement. With Plastic pipes, just put a coupling either side of the chamber, and make sure when installing, to insert the pipe to the stop then pull it back a few mm to allow the room for movement.

Then go with Ian's suggestion above, or used concrete sections if preferred.