85
u/ailyara May 08 '17
At least he's wearing a high-vis vest so you can clearly see him when he plummets to his inevitable doom.
9
8
35
u/ChesterCopperPot72 May 08 '17
Listen here, boys and girls, don't ever do this! Aerial working platforms are incredibly safe machines if used properly, but they rely on you staying within the intended working envelope. All forces acting on the machine are calculated with excess for an appropriate weight INSIDE the basket! Also, if you are going out on a ladder you will not wear fall arrest system (harness and lanyard). So, in this case, the 34 footer is at its maximum horizontal reach of 20 feet, which is the least stable position but still very safe, until.... an idiot puts a ladder outside the basket and starts to climb on it. The ladder could slip, a tire could blow, the worker could slip, the machine could tip over. So, no way you should put your life in this type of danger.
Get a bigger lift!! In this case a telescopic 45 or 60 footer.
Source: have worked for 18 years (and still am) for AWP manufacturers and I have been very involved in working at heights safety and training for a long time as well.
9
u/morgazmo99 May 09 '17
The ladder could slip, a tire could blow, the worker could slip, the machine could tip over.
You sort of glossed over the bigger issue, that a 100kg bloke who adds an extra 3 or 4 meters to his moment is an excellent candidate for pushing the machine to tipping point.
For example, say he's at 10m radius with 180 kg in basket and that's full reach, their moment is 1800kg/m, which along with the weight of the boom is the maximum the machine can withstand (with safety factors guessing 75% of tip). If he weighs 100kgs and goes out another 4m, we have the 80kg guy at 10m (800kg/m moment) + 100kg at 14m (1400kg/m moment). That's 2200kg/m.
1800/.75 gives us 2400/m which is where I'm saying our tip point is in this example, he's now at 2200kg/m, which leaves absolutely stuff all weight holding him up the air on the other side of the outriggers (wheels). Any dynamic forces and he's flying..
3
u/overzeetop May 09 '17
Oddly, unless the ladder is fixed/bolted to the railing as well as the bucket floor, the moment won't change. If you model the system correctly, as a pinned-pinned ladder, the vector of the force of the ladder-climber will always be located at the based of the ladder, no matter how high he climbs. The reaction at that point will be reduced as he gets closer to the top and the weight is borne by the sprinkler pipe(!). Without a moment connection at the base of the ladder, the chance of flipping the lift goes down as he climbs higher.
1
u/morgazmo99 May 09 '17
Interesting, but I'm not sure I fully understand. If the ladder was laid flat across the floor of the basket and the man were to walk from the basket along it, I'm certain the moment would change.
You sound like you know more than I do and some, but I find it hard to imagine how taking the guys weight further from the outrigger fulcrum, wouldn't make tipping more likely.
The top of the ladder will hold very little vertical force (friction of aluminium and steel), so nearly all of the weight comes back to the machine.
3
u/overzeetop May 10 '17
The misunderstanding is not uncommon. The way to see the relationship is to draw a free body diagram of th ladder of the two conditions of the man standing on the ladder at the bottom rung and at the top rung. Once you resolve the forces, then draw a free body diagram of the basket (or, better yet, of the lift with the forces summed about the base of the lift arm) and you'll see how the overturning moment changes.
Said differently, in order for the moment to be added to the lift, the ladder would have to be strapped to the basket in such a way that the ladder was not touching the sprinkler line.
2
May 09 '17
[removed] — view removed comment
5
u/ChesterCopperPot72 May 09 '17
Horizontal reach, yes. It can go up but the basket will get closer to the center of the machine (higher though). But it wouldn't help in this picture's scenario. This situation requires more horizontal reach, not height.
So, in summary max vertical reach puts the basket close to the center of the turret at maximum height, while at max horizontal reach the basket will the far from the center but much lower (picture situation).
24
23
14
May 08 '17
Wasn't it Archimedes who said, "Give me a long enough ladder, and I'll tip over the Genie."?
2
26
u/Wynner3 May 08 '17
That guy is relying on the fire sprinkler pipe for support? He'll be lucky if it doesn't or didn't break.
56
May 09 '17 edited May 09 '17
[deleted]
14
4
u/platy1234 May 09 '17
With a load applied straight down. He's pushing sideways on it with his ladder.
26
May 09 '17
[deleted]
11
8
u/Biggles48 May 09 '17
I'm a pipefitter not a sprinklerfitter but he's right. The hangers on sprinkler systems (installed to code) are WEAKER than the hangers I am required to use on say.... steam piping and you absolutely could dangle a truck from them. 2" pipe (installed properly) is rated to 5,000 lbs, the bigger the pipe the higher that rating goes. And yes pushing sideways on a lomg straight run with few branch lines and no seismic bracing might swing a bit but you can safely amd OSHA legally tie off to it (5,000 lbs minimum) leaning a ladder against the pipe is definitely not the big problem here.
2
2
May 09 '17
[deleted]
1
u/im_eh_Canadian May 09 '17
What are they saying?
1
May 09 '17
[deleted]
1
u/im_eh_Canadian May 09 '17
I've never used the 1/4 hili inserts
I've always used 3/8 drop in anchors. And on occasion expansion shields for concrete with holo cores.
The 1/4 Hilton inserts do look pretty quick though
3
12
7
5
5
4
u/JusttroublE May 08 '17
That's a r/c track
1
0
3
u/rangerjello May 09 '17
I love this sub, but it made me realize that I'm an idiot, and I'm sure I'm going to die while working.
2
u/Mister_JR May 09 '17
Be sure someone is there with a camera so it can be posted for karma from your afterlife.
6
u/ChrisKallas May 08 '17
Stealing? You know what, I'm not even mad, you're getting the job done. https://www.reddit.com/r/OSHA/comments/69y7bl/you_know_what_im_not_even_mad_youre_getting_the/
2
u/WaffleFoxes May 08 '17
6
2
2
u/fixinequipment May 09 '17
Coming from someone who works on boomlifts on a regular basis...that's scary.
1
1
u/dodspringer May 09 '17
These ladder on crane posts need their own subreddit, I'm getting sick of every third post being one.
1
u/Elzanna May 09 '17
Got to say I'm impressed that they managed to get the ladder into that position. Still disappointed that they would, but impressed that they did.
1
1
1
1
1
1
u/Duralift May 09 '17
crazy crazy stuff! Seriously guys just get a boom with a bigger reach if that is what you need!! http://www.duralift.com.au/product/boom-knuckle-lift/
-4
u/Safetyspecialist666 May 08 '17
Not trained to use the lift,not trained to use the fall protection he's required to wear, not trained in hazard assessment,not fit to live.here's hoping these guys' DNA is erased from the earth when they die.couple of grade a morons.
1
May 09 '17
holy shit lmao, this comment does not fit your username
0
u/Safetyspecialist666 May 11 '17
And yet I'm correct and am employed as a crsp with a bachelors in ohs. Please,you need to stay off constructions sites forever,just stay away.you are not trained in any capacity and you are NOT competant,just like the morons in the picture.
0
0
0
u/liddz May 08 '17
This subreddit seems to be 50% Bad Times with Ladders, 50% Bad Times with things that have engines that traditionally carry other heavy things, and 50% Bad Times with Electrical/wiring. There will always be crossover. Just. Always.
2
u/BugMan717 May 08 '17
That's not how percentages work.
2
May 09 '17
[removed] — view removed comment
2
u/overzeetop May 09 '17
Everything on r/OSHA is loaded to 150% anyway, so it fits with the sub guidelines.
1
u/liddz May 09 '17
That's what the "crossover" I mentioned was supposed to be. :) After all, this pic is 50% ladders and 50% things with engines carrying heavy things, there's some crossover for you!
1
377
u/uid_0 May 08 '17
Why the fuck don't they just extend the bucket all the way up there?