Casting Lintels in situ

[BritinFrance]

Hello from a newbie living in France.

Can you guys help me with the correct mix of concrete for casting in-situ lintels? I know than I need to place reinforcing rods 1 to 11/2 ins above the base of the casting mould.

Haven't figured out the pouring aperture yet although my SDS drill on hammer will help the vibrating necessary to remove trapped air etc.

Your advice/comments are most welcome

 

[stuart45]

6 and 1 all in/ cement.

 

[BritinFrance]

Thanks Stuart,

I assume the hole made for pouring in the mix is shielded at an angle so that its higher than the lintel top? Presumeably one knocks the resulting spur of with a trowel?

Sorry about the jitters but its my 1st one.

Thanks in advance

Regards

Jim

 

[noseall]

You would form a three sided shutter box leaving the top completely open, all bar a few stiffening struts. Pour the muck in, vibrate, then trowel the top smooth.

 

[BritinFrance]

Casting in situ for me is actually in place above the opening - not casting 'on-site' and then having to lift in place. I am assuming that you method refers to the 'on-site' method?

Jim

 

[stuart45]

Casting insitu means that you don't have to move the lintel. If you have to lift it, the lintel is still precast regardless of whether it is done on site. The top should still be open when done insitu. Use some double headed nails where the formwork meets.

 

[BritinFrance]

Thanks Stuart45 and all others

SORTED!

Its about 3 months down my work list of essentials, and includes many of SWMBO's "I've had an idea" or "Can you just...."

Sure you all have been there!!! Is there any end????? (Don't answer that, cos if there isn't, I don't wanna know.)

Regards

Jim