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Let's not spend any money on infrastructure though
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Jan 20, 2015 17:32
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Tater Love 
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Bhodi posted:Speaking of rebar, that stuff looks dangerous as poo poo and is everywhere on construction sites. Why don't you ever see any injury videos? I guess it's not funny enough to be made into a gif? I think it's mostly that rebar work is boring and nobody thinks to film it as it is happening, so the best you could do was CCTV from an adjacent site. Rebar injuries almost always involve impalement, with the usual initial cause of falling off of something, which tend to happen really quickly, so no quick "pull out my phone and record this" either. Even some "proper" ways of protecting against impalement are not that handy, as shown by this. if that's what you're looking for, though, here's an investigation animation: http://vimeo.com/76576066
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Jan 20, 2015 17:37
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Slugnoid posted:Rebars usuailly stuck together in big jungle gym frames before cement is poured over it. You only usually see the exposed sharp ends like in the movies when a buildings being pulled down I've only done small concrete jobs, 10-20 cubic yards of concrete. The rebar usually comes in bundles wrapped together as a giant heavy post while it gets shipped to the job site. Once on-site, the bundles are broken up, cut to length, and layed out in whatever area will get filled with concrete. A road bed might get two or three layers of bar, depending on how thick the concrete needs to be, before wire is used to tie crisscrossing rebar together. For something vertical, like a post, the ends are usually bent over (rebar is pretty flexible, like cheap steel or something, it reminds me of a paperclip) mostly to keep the tops from splaying out but the whole post needs to be wrapped in a frame. I saw two methods: one was to just use plywood with a 2x4 support frame, the other was just thick cardboard tubes. Laying rebar out isn't too difficult, tieing it all together is a huge loving pain in the rear end. Concrete is astoundingly heavy. Just moving a thin layer around in a frame is tons of work and I don't envy anyone that has to work with it on a regular basis. All the tools involved have to be heavy. The frames have to be heavy to hold the weight of the concrete. Big pours have to be finished quickly to get everything in place (removing voids is most of the work) then making the surface look nice takes a lot of skill if it needs to be structurally sound. People that have only poured a sidewalk might think you can just spray water on it to smooth out the surface, but that changes the way the cement cures and can make it the whole thing weak and brittle. EDIT: Those mushroom caps are bullshit, more for visual caution than any sort of protection. I guess they might keep you from tearing your jeans on a sharp end or something.
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Jan 20, 2015 17:52
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0:35 seconds in that animation is wonderful. The people making that had to have had a sense of humor. If only the doc did a "thumbs up!" at the end.
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Jan 20, 2015 17:53
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zakharov posted:Let's not spend any money on infrastructure though Yeah we're gonna be seeing a lot more of that kind of stuff in the next couple years I bet
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Jan 20, 2015 17:54
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Slugnoid posted:Rebars usuailly stuck together in big jungle gym frames before cement is poured over it. You only usually see the exposed sharp ends like in the movies when a buildings being pulled down This really isn't the case. I mean, yes, rebar is often used to form a grid, but it's also often exposed in upright positions. This sort of thing:  which is why they make these:  And it's OSHA required to use them now. e. SopWATh posted:EDIT: Those mushroom caps are bullshit, more for visual caution than any sort of protection. I guess they might keep you from tearing your jeans on a sharp end or something. Really? You'd rather fall on an exposed bar than one of those caps? I'm no expert but it looks to me like if someone trips and lands squarely on a cap, it'd save them from impalement.
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Jan 20, 2015 17:54
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Leperflesh posted:Really? You'd rather fall on an exposed bar than one of those caps? I'm no expert but it looks to me like if someone trips and lands squarely on a cap, it'd save them from impalement.
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Jan 20, 2015 17:56
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gently caress no I've been burned way too many times to just click on linked videos in this thread. I don't like watching videos of people getting killed, and since you motherfuckers cannot exercise any sort of control, I'm just not clicking videos any more unless it's completely clear that it's not death porn. e. OK, so yeah: that video shows that in one specific scenario, one specific brand of cap was ineffective. That hardly proves that all caps are ineffective in all scenarios at preventing or reducing injury. Leperflesh fucked around with this message at 18:03 on Jan 20, 2015 |
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Jan 20, 2015 17:58
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Just click it. No people involved, but you'll see a bag of concrete mix or sand or something get punched right through after falling from a height of a foot or two above the rebar.
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Jan 20, 2015 17:59
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Please put  or  tags on images/videos where people die/are dying/ are dead or better yet, have some restraint and think "should I post this?" before you do so as most people don't want to see it. Thank you.
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Jan 20, 2015 18:00
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When I was about 10 years old a friend of mine bent down to pick up a ball and got an unseen bit of rebar stuck about 3 inches into his eye socket so those orange mushrooms make sense to me having seen that happen
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Jan 20, 2015 18:06
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peter gabriel posted:When I was about 10 years old a friend of mine bent down to pick up a ball and got an unseen bit of rebar stuck about 3 inches into his eye socket so those orange mushrooms make sense to me having seen that happen That story could do with a bit, but not too much, more detail. How dead is he?
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Jan 20, 2015 18:15
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Computer viking posted:That story could do with a bit, but not too much, more detail. How dead is he? He didn't die or anything, it was one of those '1 millimetre to the left and he'd be DEAD' situations, although he did have to have surgery. It was loving awful though and probably the worst thing I've ever seen in person, his reaction was totally animalistic when it happened, like a wounded animal, very harsh
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Jan 20, 2015 18:21
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Somebody fucked around with this message at 19:07 on Jan 20, 2015 |
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Jan 20, 2015 18:24
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 [img]
Somebody fucked around with this message at 19:06 on Jan 20, 2015 |
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Jan 20, 2015 18:26
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please tag those NMS jesus christ
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Jan 20, 2015 18:27
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Somebody fucked around with this message at 19:06 on Jan 20, 2015 |
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Jan 20, 2015 18:27
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here's a relaxing one (USER WAS PUT ON PROBATION FOR THIS POST)
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Jan 20, 2015 18:28
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I fell into a calming sleep after the 4th one
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Jan 20, 2015 18:29
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JFairfax posted:
I'm not terribly affected by most depressing poo poo on the internet, but that picture always gets to me.
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Jan 20, 2015 18:33
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Woo, I design gear that puts the tension load into rebar and from what I have seen almost any tall tower that is to small to have proper piles in it will have foundation bolts/bars which is essentially 30 metre lengths of rebar that poke out of the ground for like 3 feet above the surface. Then they stick the tower stuff on top and bolt it down using the foundation bar/bolts.
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Jan 20, 2015 18:52
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A friend of mine fell over while working in a construction site and got stabbed by a piece of rebar through his armpit. Thankfully it missed the artery and any major veins. He didn't last long in construction.
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Jan 20, 2015 20:03
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Rebar! 
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Jan 20, 2015 21:41
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Jan 20, 2015 23:58
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Bhodi posted:Speaking of rebar, that stuff looks dangerous as poo poo and is everywhere on construction sites. Why don't you ever see any injury videos? I guess it's not funny enough to be made into a gif?
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Jan 21, 2015 00:31
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lone77wulf posted:It's a oddly clean looking break though. That's because it isn't a break. Those kind of bridges are built in sections with small gaps to allow for the bridge to expand and contract due to temperature. Often the pieces sit on metal rollers, what probably happened is that the bridge failed on the other side and pulled the pieces apart.
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Jan 21, 2015 03:11
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I thought the main danger of rebar was if you leave some small lenghts of it sitting on the ground, somebody might come by and do a log-roll trip routine when they step on the pile and it goes rolling. Good to know that impalement is the real danger 
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Jan 21, 2015 03:38
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Lutha Mahtin posted:I thought the main danger of rebar was if you leave some small lenghts of it sitting on the ground, somebody might come by and do a log-roll trip routine when they step on the pile and it goes rolling. Good to know that impalement is the real danger https://www.youtube.com/watch?v=Aaop6e17aRs
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Jan 21, 2015 03:43
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Lutha Mahtin posted:I thought the main danger of rebar was if you leave some small lenghts of it sitting on the ground, somebody might come by and do a log-roll trip routine when they step on the pile and it goes rolling. Good to know that impalement is the real danger I see no reason why we couldn't combine the two.
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Jan 21, 2015 03:54
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Spanish Manlove posted:Please put I'm confused by this post in the context of this thread.
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Jan 21, 2015 04:11
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Bhodi posted:Speaking of rebar, that stuff looks dangerous as poo poo and is everywhere on construction sites. Why don't you ever see any injury videos? I guess it's not funny enough to be made into a gif? The girl who played Cordelia on Buffy was impaled on rebar IRL as a child. The episode where it happens on the show is a reference.
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Jan 21, 2015 04:14
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smackfu posted:Rebar! Oh god, and that pile is the ridged stuff. Every bit of length would get stuck into the wound like a horrible bleeding gasket.
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Jan 21, 2015 05:39
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I'm picturing a skydiver landing on that after both chutes fail
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Jan 21, 2015 05:55
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XMNN posted:when i was about 10 i saw my friend trip over a piece of concrete with some exposed rebar in it and rip his shin open. lots of blood and you could see bone. it was hosed up really I, too, have a rebar-injury story. This is highly graphic, and way more disturbing than the eye-socket one. Read at your own risk. When I was young, I was working with my father, who was a pool and patio contractor. He had to get rid of some rebar, which he did by bending it back and forth increasingly rapidly until it broke. Then, he said (paraphrasing), "Check out how hot it gets from that," and touched it to my hand. It hurt really bad and left a tiny scar on the back of my hand that is still juuuuust barely visible, 25 years later. Try not to lose your lunch thinking about that.
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Jan 21, 2015 06:07
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Bhodi posted:Did you not just click the video above? On the other hand I feel like the caps are meant so that if a person were to fall onto several pieces of upright rebar, the caps would allow for an equal distribution of weight due to their ability to absorb impact, therefore it makes it more difficult for the rebar to penetrate. This is a rudimentary application of physics though, so don't take my word for it.
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Jan 21, 2015 06:07
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i think the idea is that if you trip and fall onto some rebar, you won't get torn open if you fall onto it from ten-plus feet it might save you if you fall onto it from twenty-plus feet you've got other problems
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Jan 21, 2015 06:11
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revmoo posted:I'm picturing a skydiver landing on that after both chutes fail I'm picturing it launched from a trebuchet into a row of dwarves Reign Of Pain fucked around with this message at 06:17 on Jan 21, 2015 |
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Jan 21, 2015 06:15
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An Angry Bug posted:
I've never seen non-ridged rebar. The ridges give the concrete something to "grip" when dried: if it had no ridges, I imagine the rebar could just slide right out. In fact I think non-ridged rebar would just be... bar. As in, bar stock, just plain old steel bar.
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Jan 21, 2015 06:32
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smackfu posted:Rebar!
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Jan 21, 2015 06:38
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GentlemanBrofro posted:On the other hand No hardhat. I'm alerting OSHA.
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Jan 21, 2015 07:04
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