Building a Log Bridge - GoPro Timelapse
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- čas přidán 30. 03. 2012
- peplers.blogspot.co.uk/2012/03... Timelapse of me and members of Engineers Without Borders (EWB) from Imperial College building a log bridge in the woods. Check out my blog (link above) for a description and still images. The timelapse was shot with a GoPro HD Hero, using VirtualDub to assemble the frames into video, and also some stills from my Nikon D60.
Music is royalty-free by Kevin McLeod (incompetech.com), the tracks being Firebrand and Neolith. - Jak na to + styl
Great engineer skills , teamwork , and hard work , termites will be happy.
Thankfully no widespread termites in the UK! :-)
Mike Pepler Cool , where I live a proyect like that is doomed if is not cedar or treated wood.
multimossad So why won't they eat cedar? While we don't have termites, there are still other bugs that will eat the wood (albeit more slowly), but I used Sweet Chestnut for the main part of the bridge, and the tannin levels in it make it resistant to rotting. Do termites eat Sweet Chestnut?
cedar is naturally termite and carpenter ant resistant ,( if you taste a little bit cedar sawdust is very bitter ) , treated wood has arsenic and heavy metals that prevent decay
Right, so I wonder if Sweet Chestnut is termite resistant too, as, like cedar, it has high tannin levels? Or are they not high enough?
Looks very strong. Nice job!!!
Very cool video. and good for those guys!
Decomposition of the wood is dependent on the species. White oak, black locust or hackmatack could last 10 to 15 years as they are very rot resistant. As an example, during bridge reconstruction in Rhode Island for I-195 over the Seekonk River, century old white oak pilings in a wet anaerobic state were still considered structurally sound to rebuild a bridge and road bed upon. Guess the old timers knew their stuff.
+William Quilitzsch interesting, thanks!
Right dear
Definitely. And then, Japanese Shou Sugi Ban. Charring a deep coat of the outside makes it almost impervious to UV, termites, rot and even water if waxed.
I am 7 years late to this comment, but I guess, this fun video is still viewed.
Great Job ! Need you guys to build a bridge at our Scout Camp in Canada...in JUST 7 minutes !
+Eric Simkins sounds like you need army engineers to really do it that quick!
Great job and I'm sure, a lot of fun as well. Go Team.
Thanks!
What an awesome group project. A few more center boards for atv’s
Yes, they had fun! Since then it's had another layer of boards put on top, at a right angle to the direction you drive, so there's no gap in the middle.
Muy bien muchachos.👍🇭🇳.good job. Guy's. Good team
awesome timelapse!!
It is dear
Great idea. This seems like it would definitely hold a mid size farm tractor and wagons/implements. I have a few streams that look like this on my farm and they are kind of keeping me from fully utilizing the ground.
My friend is now driving over it in a Land Rover Defender, weighing about 2 tonnes, plus a trailer of about a tonne. They're not all on the bridge at once, as it's quite short, but it easily holds the weight.
This was a bad idea, bad, because it will fail. That wood started rotting the second the tree was cut, five years max, the vehicle will fall right through. Like I mentioned above, a small stream, buy a 3' dia. by 10' concrete pipe for $50, cover that with a few feet of gravel, it will take the load. To make it last, add retaining rocks or walls, a concrete slab would be cheap and last forever.
You need planning permission to build with concrete in woodland in the UK. The wood used is sweet chestnut, which is usually good for 20 years in soil. This bridge is carrying 2-3 tonne vehicles today, 4 years on, and is doing fine.
very nice job
Very cool!
Thanks! 🙂
Awesome, nice work! :)
They built a pretty cool bridge thou I actually like it
I have been rebuilding a wooden bridge for weeks, the mistake that was made on my bridge ( built by someone else maybe 30 years ago) was that the ends were touching the dirt and it rotted it there, so I have had to cut off the rot with a chainsaw and fibre-glassed over those cross members, then put marine varnish with UV protection, as well as bolted on a 3/8 inch 6x6 angle iron piece to stabilize the bank erosion, it will then be filled up with crushed gravel. I am also going to use Sika-flex marine caulking between the planks to keep the rain away from the two large supporting logs and all the planks are being soaked with green wood preservative with copper and finally I am putting Austrailian deck oil ( Cabot brand) into all the planks. (another bridge video on youtube used linseed oil thinned out with mineral spirits) but I am going for the Cabot, there is a more expensive Austrailian brand called Deck Doc that has lanolin but it is twice the price and it's just a bridge. The planks ideally should be spaced about as wide as a paint stick then the caulking can fill it in easily, the planks were all touching each other originally which Is a mistake because the soils get in between and promote rot. The bridge is on Vancouver Island and has to endure lots of rain and snow in the winter. lh3.googleusercontent.com/-B2SgLNux1aE/XZvfCpTKcaI/AAAAAAAAFys/GLQJht5NphM_VhgEBQ0X7Pj6xwf10yRlACK8BGAsYHg/s0/2019-10-07.jpg
Nice work! 🙂
Bless u bro
Not to mention the fact that during a heavy downpour, that little creek can probably turn into quite a flow.
A lot of negative comments, I guess everyone below is a skilled bridge builder. Keep up the good work and don’t listen to the naysayers.
+JohnsRadios thanks! :-)
Firebrand, royalty free from Kevin McLeod
Did you have to dry the logs at all or were they freshly cut? Did you ever thing of charring the logs for moisture / bug resistance or did you do something different?
They'd had a few months since felling, but would still have been quite green. We did peel them to reduce scope for bugs eating them. They sweet chestnut, so pretty durable.
Have you seen the price of diesel in the UK?
It appears to be either a school project, practice for future endeavors, or just a bunch of friends doing something together. Whatever it is, you can't really complain about their efficiency. They're out in the woods doing something with their hands. Certainly better than sitting around inside all day, regardless of efficiency or skill. Also, it looks like even when they aren't using their hands, it doesn't look like they are twiddling their thumbs either. Maybe discussing how to do something, as they are almost certainly more inexperienced than the people who would be attracted to this video.
+user.equalto.Null yes, it was a group of students, none of them had ever built a bridge before, and I pretty much left the design to them, I just did the chainsawing and provided the tools. It's still in use now, so not too bad!
So much hate in the comments, wow! Great job! I think it was very helpful. Thanks for sharing!
+Jake thanks, glad you liked it.
Thanks! :-)
To be fair, it was their first go at building a bridge to take a car (and mine too!), and they normally live/study in the middle of London.
This was great bridge, saw too much hate, yeah took a long time but nice job
Thanks! :-)
any chance helping built one from KeyWest to Cuba .
Trying To Figure Out How To Build A Log Bridge - GoPro timelapse
😂
Fun project no doubt but a 36 inch 12 ft long corregated and galvanized steel culvert would outlast the wood bridge 20X over.
+Red Woods true, but the goal was to use trees felled in the woods as far as possible. It also avoided any risk someone saying we should have had planning permission, as being built of wood with no concrete foundations means it can be regarded as a temporary structure.
Good point and understandable.
Nice work, would drive my car across that no dramas.
Thanks! I drove across it yesterday...
Hey did you guys
Add three beams
+Jake McLaughlin we bought the beams, the rest of the timber came from the woods.
Expertise civil engineering knowledge here!
😂 I'm not sure how many of them were civil engineering students! But it's still in use, over 8 years later.
@@mikepepler yes it is dear
About 2 secs between frames.
Nope, I wouldn't call it a truck either. It's the smallest 4x4 I could find that was still able to pull my trailer. Didn't want a big vehicle due to fuel costs.
Engineers without bridges ? Nice effort but a coarse or two in practical engineering would be good . Plan ahead was my second thought . (I didn't plan ahead )
I think this was effectively their practical course, carried out by trial and error! 🙂
Hey mike
Need to know
How many seconds per shot?
Might be 32x?
I think they (the students) were nervous that if they built a little bridge then it might break one day and drop my car in the ditch! So they built it a lot stronger than it strictly needed to be, but I'm not complaining! :-)
As soon as possible
Sorry, only just saw this, CZcams Studio app must have been broken in the past...
Lots of just standing around. Much more complicated than needs to be....
Good
I left the design and planning to them...
the timelapse needs to be a little faster but other than that it is a great video
I think the students were worried I was going to drive my car onto it and have it collapse! Hence the oversized pieces of wood...
Lots of hate here guys ,at least give them credit for trying .
+the Lying Scotsman thanks, it was the first bridge they'd built, and is still in use now...
Haha, yes truly over engineered, but we didn't know much about the strength of the wood we were using and we wanted to make sure we didn't kill Mike. (I'm the guy who needs a hair cut in the vid)
Were there rules to use only logs or could they have used stone also? I have to build an bridge for crossing a creek just about that size. It has to be strong enough to support my truck. I would have to consider that bridge's life span to be short because they are putting logs in contact with the ground.
We wanted to do it using the wood available at the site as far as possible. It's Sweet Chestnut, so will last longer than most wood in contact with the ground, due to the high tannin content. It's held a 2 tonne land rover pulling a trailer with 2 tonnes of stone in it.
+Mike Pepler Thank you for replying. I have 23 acres of land over half of which is mature forest. And a creek bisects it making access to the back portion impossible. I've been searching for a type of low tech bridge I can build on site and this looks like I can do it but I would have to modify it for the bank supports. I have tons of rocks on the surface and I recently bought a small 3.5 yard portable cement mixer I can run with a generator. I just didn't understand burying the logs but I get it now.
If you dig a pit on each side and fill it with rock as a foundation then the wood won't be in contact with the soil. We nailed chicken wire fencing mesh on the bridge deck at the end, so it wasn't slippy when wet.
that was cool I liked the design really liked to see you quopration level. it looks nice
A small stream like that, cheapest thing would be to just buy a drain pipe. Concrete or steel, fill over it with a few feet of dirt, pour a slab to distribute the load. It will last forever, not a few years like this garbage design.
How old are these people
+Andre Fonng apart from me, they're university students, probably 20-22.
Why would you complicate such a simple project?
I left it to the students to decide how to build it. I was quite happy with them over-engineering it though, and it's proved worth it now as it's carrying a 2 tonne land rover and heavy trailer regularly.
why did it take that much time to do this.? with all those ppl yall coulda had it done in a few hours
Yep, but they were students and I was letting them organise themselves! ;-) Also, they were there for a fun weekend camping, and didn't need to be in a hurry.
´1 trabalha e 10 olham!
Yes! :-)
3:50 The dude in the blue jacket is notorious for just standing around doing nothing.
He's the "supervisor" Shoe in for a government job.....
Hi
why did you build big bridges for little creek? mines bigger creek and i got small bridges for real.
That's just the wood that was available. Still standing now.
was he dancing at 1:04
😂
I’m speechless at some of the comments posted. At least it’s clear for the world to see what complete ass clowns you are for ripping on kids doing something productive. Nowhere in the description does it mention “Best Bridge Build” or “Everyone Should Build Their Bridge Like This”. Typical, bunch of keyboard warriors talking shit. To the guy that posted this: you have a lot of patience and tolerance that I wish I had. Would have saved me from a couple trips to the pokey lol. Now, I’m going to go work on my bridge....
Thanks! 🙂
This is no different than professionals, 3 workers and 5 leaners (somebody has to hold up those shovels)
Yes, and much more obvious with the timelapse!
our future here folks, bunch of kids who will soon have a piece of paper saying their engineers working "hard", could have been built by 1 20yr old that's had to really work for a living in one day. just MY opinion
+mason l True, lol! But to be fair, they were on a holiday weekend, and doing this for free, so weren't in much of a hurry.
mike pepler+ sorry to come off as an ass, i have a 20yr old in my mothers home who has had everything give to em and they won't and don't know how to do basic chores, kudos in teaching them something, and kudos for no phones in their hands.
+mason l no worries :-) sounds like the 20 year old you mention has some catching up to do. I sometimes wonder how people like that would cope in a real emergency...
Seems like way to much work that nobody's going to be using it
Actually, it's in use several days each week, still working fine.
Seems way more complicated than it had to be
+HandicapUser Probably was! But I left it to the student engineers to design it. :-) Anyway, it's still standing 3 years later, and has taken vehicles weighing 2-3 tonnes, so I guess they did a good job!
+HandicapUser haha thats pretty typical of engineers
My question is why are you taking the bark off to logs makes absolutely no sense
It makes the wood more durable, I think because the bark can hold water and provide a place for bugs to live.
Durability might vary from one species to another? I've never tested to see if it really makes a difference though. Still, it gave the students something to keep them busy! :-)
Mike Pepler that's true
такая толпа народу и так долго делают
Большинство из них просто смотреть
Hmmm... why did you need a bridge?... you could step over stream!!... 😂😂
To drive vehicles and trailers over it.
Not removing that stump in the foreground was a mistake! It will come back to haunt you.
Could be, though it's OK so far.
wow , 6 people ,2 days , and from Imperial College , dont they teach even basic kids "Leonardo da Vinci Bridge" , and Leonardo da Vinci machines in motion , AKA keep it simple stupid , gravity is your friend, and everything's a straight line etc... southerners these days... these guys probably dont even have a garden shed to do practical real life building their latest and greatest computer simulation with sticks and plastic string add a little heat and it all gets very tight...
too many people for this work
It's a young persons learning class.... take your pills and calm the hell down.
I was letting them organise themselves.
@@mikepepler Six years, man. Six years.
Not impressed. I built a wooden bridge over a stream that has a 22' open span by myself in 2 days with scavenged material. Drove a truck loaded with 5 yds of gravel over it to test. Bridge is still in great service now and I built it 15 years ago. High school education, country boy with common sense:)
First time they'd built a bridge though.
@@mikepepler Mine was too:)n Bridge is now 25 years with daily vechile traffic, including UPS and Fedex tracks and has only had periodic deck board replacement. Main structure zero maintenance and still in great condition.
That's today's generation , scary.
Learning how to build a bridge and building it yourself? Easy captain snowflake. They are just kids....
Just learning as they go.
The kids got it done and didn't mind getting their hands dirty, far cry from most kids this age that have their heads buried in their cell phones. Nice job kids.
+Joseph M they're all graduated and working now I expect, hope they've moved on to bigger projects...
It would be faster and cost less to use concrete tube and fill the sides with concrete to even out the round part to be flat with the ground.
Yes, but the idea was to use local/natural materials as far as possible, and concrete is a less environmentally friendly option too. Also, planning permission would have been needed for concrete use.
This is why the word "engineer" was a joke when I worked at a machine shop.......
should have just layed a nice big piece of tubing and then just filled around it with dirt...but if you just did this for a fun project, bravo
Yeah, that was the other option, and I've done that for a couple of smaller streams. But this would have needed quite a lot of rubble/dirt, and the students wanted a project to do while they were visiting the woods, so it seemed like fun! :-)
those logs are flat!
They are planks
😂
Over engineering is good!
Why do you use such crappy log beating for a soundtrack?
😂 It was copyright free music.
Thats Not Even a truck
So?
bunches lazy standing doesnt help make my eye itching
omg that was painful to watch.
mkay... why not to just dig it to flat ground?
+Kostja08a I think that would have been a lot of work.
naah, not realy, 2-3 hours and done
That girl in the white literally did nothing...
nerds building smal bridge :P
Did the job though, it's still in use now.
Main trusses not logs. Lied in the title. Thumbs down
True, it has planks on top to drive on.
Should have treated the logs with tar or pitch to last longer
That would help, but they're Sweet Chestnut, so high in tannins - they should last 20+ years even in contact with the ground.
just bury the creek... lol
We did consider that... But a pipe big enough to handle the water in winter was quite expensive, and it would have needed a lot of stone to fill it up.
+Mike Pepler what about many little pipes stacked on top of each other.
+Hamguy Bacon That would have worked too, but still costs quite a bit, and the pipes would need unblocking due to debris coming down the stream.
Mike Pepler This is why we need engineers. They think about every possibility, including obscure ones. Good job, and keep our society running smoothly.
+user.equalto.Null thanks! :-)
GLAD YOU PUT a support right in the middle of the flowing brook ,,, that will be great for a pile up ,,,,,, unnecessary
I didn't think it was necessary either, but the students wanted to. It hasn't caused any blockages in the stream though.
A bit overkill if you ask me.
+King yes, but I wasn't complaining given the students were doing much of the work...
just frame it, lay in a rebar mat and pour concrete
Sure, but that would have required planning permission, and cost more too.
I will need just a machete a hammer and some nails and it can ply 16 ton tank.
Too many kids around not knowing what they're doing! waste of time and useless!!! can I have my seven minutes back?
+excelcsllc I might have been better off with a smaller group...
Seriously, you claim that an engineer helped to build that? Not likely, not unless he went to a college of idiots. Total waste of labor, trees and time. The wood will rot in a few years, three years and that car will crash through, guaranteed. What would be so difficult about building a foundation for the supports? Ever hear of an Alaskan sawmill? It's just a guide for a chainsaw. It would have given you straight log beams with ten percent of the effort.
+Robert Carver student engineers, and the wood is sweet chestnut, so takes a long time to rot. The bridge is taking 2-3 tonne vehicles today, several years after being built.
+Robert Carver also, planning permission would have been required to build one using stone and concrete. There's also a certain satisfaction from building the bridge using timber felled just a few steps away.
Look at other U-tube videos and you will find others who built stupid bridges with no foundation and failed. You will not be so proud when in 5 years it crashes down and somebody gets hurt. If it starts to rot, which I am sure it already is, then take it down, do not let it fail catastrophically. I am a structural engineer, I see these dumb ideas all the time. Sure, it works for a year or two, but a phone call and permission is not much of a setback and could have saved you a lot of grief. You didn't even use pressure treated; chestnut is good, but bugs, fungus, bacteria and mold love it too.
I'm not expecting it to last forever, but thanks for your concern, I'll pass it on to the person who drives over it regularly.
That why you buy a real truck, then all you do is shift into low 4wd and drive through, no need for a bridge.
Only problem is that a truck like that would be too big for the parking space at home, and use too much fuel as well...
nice work, but over engineered.
Craig Le Privit nothing wrong with that, especially if you're just doing it for fun (not to mention not wanting to kill a stranger) lol.
This gave me a headache
Lol 😂
This must be a union job. Ten people standing around doing nothing while 2 to 4 people Actually doing work.
Lol 😂
I say this honestly, and not to insult anyone: I could build this by myself, in half the time, and slightly better.
Yeah, but they had fun doing it. They were on a weekend camping in the woods, but were keen to do something useful while they were there.
clear they have no clue what a log bridge is
Well, it worked, and is still standing now.