Floor beam as lintel

[bsr]

I'm having an extension built where there was previously a brick bay. For whatever reason (I assume the builder didn't trust the foundation) he has used a floor beam as a lintel to span the bay and then rested the ends of the beam & block floor beams on it.

So effectively I have a 175x75 beam used as a 3m lintel for a domestic floor load.

I calculate the load as 19kN
4.2kN /m2 x 1.5m (half floor span) x 3m
The 4.2kN comes from Bison flooring spec guide.

What do you think, is that ok? Floor is bouncing but I know that's normal before grouting.

Thanks

 

[bsr]

I've found a load table for PCC lintels which says 140x100 is good for 3kN/m at a 3000 span which makes me think it won't be ok for 6kN/m at a 3m span?

 

[Notch7]

It should’ve been on the floor beam design

 

[George_engineer]

What is the 175x75 made from?

Doesn't sound like it's suitable. Do you have an engineer involved with the project who can advise?

 

[bsr]

What is the 175x75 made from?

Doesn't sound like it's suitable. Do you have an engineer involved with the project who can advise?

Pre cast concrete floor beam with 3xreinforcment bars.