160 mm hole in concrete vault - best way?

[jaso]

Planning to run two 160 mm ventilation pipes from the basement up through the house, plus a bunch of flex tubing for electrical cables. Unfortunately, it's concrete slabs.

What's the best way for a DIY-er to achieve this? If it's even possible.

I have access to a demolition hammer with 45J and a smaller rotary hammer 3J.

Thinking about starting with a small hole and then enlarging it with bigger and bigger drills. Then you use the demolition hammer around this hole. Could that work?

 

[vojma]

Rent a core drill at Cramo or similar.

/Vojma

 

[jaso]

Thanks! I searched for kärnborr and found relevant threads. However, it seems some recommend chiseling anyway... I could make a hole about 20x50 cm and have plenty of space for everything.

 

[jaso]

Might have to steal the forum user "pbl":s method. Chipboard as a jig in which you drill a lot of holes along the edges of the intended hole. Then use a 22 mm drill in the hammer drill and knock down the concrete block, possibly with the help of a demolition hammer.

http://www.byggahus.se/forum/verktyg-maskiner-fordon/77166-fragor-kring-karnborr-betong.html

 

[Stringfellow Hawke]

I would guess that a driller would do it for 500 SEK each. Easily worth it... There will probably be an establishment cost, but the job is quickly done.