Putlog Adaptor Shear ?

[HatterScaff]

I cant find anywhere, the shear for a putlog adaptor, does anyone know?

The reason I'm asking is this

Construction Enquirer » Scaffold collapse hurts two brickies on housing job

We have done this before ourselves as there is no way you can get a standard in and get a fat bricky to work around it:toung:

The HSE cops booked the scaffs, but I'm not sure that was fair
the way I see it, the scaff put in a 4ft tube with an adaptor in each end and bridged between the walls, back of a fag packet calc
1.2m x 1.2m x 2kNm2 + DL = 3.38kN
M = 3.38 x 1.2 / 8 = 0.5kN (swl 1.12kNm) OK
F = 3.38 / 2 = 1.69kN

or have I got this completely wrong? :embarrest:

 

[biffo0911]

Hatterscaff,

the calculation you have shown above calculates that the tube is OK in bending and shear (capacity is 29.1 kN) provided they didn't overload the platform but not the strength of the putlog. I've just dug out an old Mills data sheet and the putlog in there has a SWL of 226 kg (500lb) in shear which would mean it was OK provided the scaffold wasn't overloaded locally and the dimensions are as stated. The HSE seem to have blamed both the scaffold contractor and client in this case which I suppose is correct since the scaffold contractor didn't follow British Standards, regulations or guidance and get a design but even if he had it may have still collapsed due to the client overloading the platform!

 

[Shag]

Saw the same story myself, and have a similar job up at moment. Made the men put in bridles and punched standards up to the bridles. Awkward in space to move but just gives a little piece of mind