Girders for Beam & Block

[Boyblue]

I've seen mention of girders as part of beam and block but I can't find a video or pictures showing how it's done.  Is a girder able to span 6m and carry the weight of all the beams that would be resting on it?

 

Edited Saturday at 04:51 by Boyblue

[crispy_wafer]

Beams are typically placed on blocks over here and spaced out to suit the loading above and length/width of block infill.  Cutting a channel into foundation blocks for the steel?  Got to ask why?  Is this structural engineer designed? 

[Boyblue]

1 hour ago, crispy_wafer said:

Beams are typically placed on blocks over here and spaced out to suit the loading above and length/width of block infill.  Cutting a channel into foundation blocks for the steel?  Got to ask why?  Is this structural engineer designed? 

As mentioned I haven't seen how the girders are used in conjunction with beam & block, and I'd be curious as to how it works.  The drawing is just a sketch, no engineering involved.  Let's presume the girder is properly sized and attached, the purpose would be to support beams and block that would run perpendicular to the girder.  So that instead of 250kg, 6.85m beams you'd have mor managable 4.36m beams to install.

 

Maybe it's because all the homes here are built slab on gade, but most plans have few internal foundation walls, so opting for Beam & block could add significant cost.  I was just thinking that in a case where the plans have already been approved, having an engineer add the girder detail would be a simple fix, that is if they are designed for that purpose.  Of course the simplest thing to do would be to add the middle wall to the foundation design.

Edited Saturday at 08:16 by Boyblue

[G and J]

From what I've read on here if bnb spans more than 5m there's a definite danger of ‘bounce’.  
 

As a result we're putting an extra foundation (is it called a sleeper wall?) down the middle of the house to reduce beam length.  We will have to manhandle these beams as we cant use a crane (overhead wires) so that helps with that too.

 

Are you thinking of using a beam to save the extra foundation?