What are these holes in my concrete floor ?

[wwwebber]

Hi,
Just got round to taking photos of these holes in my floor to show you folks. They're located in various places in my house. It's a 1895 house that I've had refurbished. The floor is concrete throughout.

So what are these holes ?, are they for ventilation ? or part of some old damp investigation or course ?.

I'm having carpets put in soon and I'm worried what might happen if I cover them !!.

Untitled

• wwwebber
• 11 Aug 2010
• 1

Untitled

• wwwebber
• 11 Aug 2010
• 1

 

[masona]

May have been an old rawlbolts fixing holes, I would say no real worry just fill it in again with a suitable filler, concrete floor don't have ventilation method

 

[Blagard]

Measure the diameter of the holes, they may be part of an old black iron central heating system with old cast iron rads!

If someone put a new floor in and cast around the pipes, the pipes would later have been unscewed from a bend or tee underfloor leaving the hole you see. - Again just a guess!

Edit:
After further consideration I think the holes are too small, so I think that guess is doubtful!