Ducting question

[B Wilde]

Hi,

I'm planning to bury some 50mm ducting under my drive to carry SWA (two circuits) and x3 external CAT6 cables. The run is only about 6 meters under a gravel driveway. Each end will terminate at a brick wall (my garage and garden wall). While unlikely I'll need to use it again, I'll include a drawstring for future use.

I'd like to trim the ducting right at the surface of the gravel to avoid any ugly protrusions up either wall (and cover with gravel). To avoid water ingress, dirt and damage, i'd be grateful for any advice on the best way of sealing the ducting, allowing the cables to exit and potential access in future? I was thinking polyurethane but wondering if this is a bodge and 'Filoseal' looks out of my budget.

Many thanks!

 

[rsgaz]

There are end caps available...

http://www.jfplastics.co.uk/products/twinwall/twinwall-end-caps_plugs

...usually only intended to prevent debris entering before cables are pulled, but you could probably fashion something with plastic glands fitted into an end cap for the cables to exit.

If you ever do need to run more cables in the future, you'll regret using expanding foam to seal the end.

 

[Lectrician]

Just stuff a black bag in there. With a duct sitting vertical, no matter how hard you try, the duct WILL fill with water. You could consider a small manhole each end, the lid gravelled over, but it’s a little OTT.

If you do a manhole, just get a couple risers with no base. Pea gravel the base for drainage. Bring duct in horizontally.

 

[Tigercubrider]

When they did telecom work at an old workplace, they laid trunking with a small upstand.
This allowed horizontal exit/entry.
They used a pre made 6” square paving slab as a lid and simple brickwork to make a tiny pillar.
The slab just sat on top of the brickwork as a lid.

 

[B Wilde]

Thanks all for the advice, some very helpful ideas here - I will try to go with a horizontal approach in that case and some kind of small inspection pit. Much appreciated.