HSE Rigging research PDF

[bob]

Is anyone going to the rigging research document launch / demo event Treevolution are running in Beddgelet on the 16th of March?

 

not heard anything

any details

[WeeDee]

Stephen Hawking was told by his publishers that for every equation he put in his book he would lose half of his potential readers. I wonder if anyone will wade through this document and come out the better for it. My head hurts!

[Bundle 2]

Thats funny mate....Recently posted was an assessment via testing of rope strength degeneration through the use of knots..

The conclusion....? That the ol' addage/rule of thumb that a knot halves the strength of a rope is pretty bang on the money but, get this...IT DEPENDS........

[ContractArb]

I went to the Rigging Research Workshop in Beddgelert (it was postponed until June 29).

It was well attended with morning lectures and a demonstration by the Treevolution boys after a very good buffet lunch!

After Liam McKeown (of Treevolution)s introduction, Andy Detter (Brudi & Partner TreeConsult, Munich) gave a very informative and in-depth presentation on 'Kinematics of snatching logs & forces generated; assessing anchorpoint strength; determining safety margins of rigging operations; tree dynamics in dismantling & effect on arborist safety.'

Then Fred Hall (DMM Wales) introduced us to his latest equipment lines.

In a nutshell - apologies in advance to Messrs Detter et al - I see the most relevant point of the lecture regards the shocking of the lowering line during a 'butt-roping' operation. After all the maths, as I understand it, the maximum force excerted on the rigging point is in a direction between 32 & 42' from vertical. This force (in Newtons) will be in the general region of 10x (TEN TIMES) the weight of the cut log (in Kilos). This is ignoring the many factors affecting the operation, drop distance of log being the most obvious.

I found the techniques for estimating log weights the most helpful part of the program (section 6.2.1: Log Weight Curves & tables 6.1 & 6.2 in the HSE Rigging/Dismantling doc RR668)

All experienced climbers will have an idea of the forces/dirctions involved in butt-roping, but it was great to see that people are actually doing the science.

Note: This is JUST My attempt at a brief synopsis of the rigging workshop I attended. Please read the HSE RR668 document for yourselves, don't believe a word I've just written until you've read it!

Impressions, questions, opinions, ridicule, grief? Let me 'ave it.....

[ringsport]

Hi guys,

Is this document still available online? Neither of the two links provided seems to work for me..

Thanky!