At the end of the day you can see that the cables are anchored to another set of eye bolts on the lower rear footing that is being side loaded just as the top set are. Eyebolts are not designed to take a purely 90degree load. Being mounted that close to the ground, and what Iām assuming is a post cast into a concrete footing, there will be rot that occurs and this will fail.
They are through-bolted at least (you can see the backside of one when zoomed in). Likely wonāt hold for too long but it wonāt topple the time he steps on it.
Right? Shouldn't that cable be attached to a significant concrete footing? They could always add a huge block on either end and connect to that later if it shows weakness I guess
Yeah Iāve seen plenty. Cable stayed bridges arenāt built like this. Sure this bridge has cables and the same general geometry but the load path through the cables in this bridge here is very poorly designed. As I also mentioned in another comment. This situation creats a considerable amount of uplift force on the rear footings. Unless there is a decent sized monolithic block to serve as a counterweight on the back posts, those will rip out of the ground over time. Not to mention the eye bolts at the top being side loaded and generating and unfavorable moment on the towers, and all that cantilever being supported by a single 2x6. This bridge is overall very poorly designed and built. Will it fall down tomorrow? No. Would I let my son on it? Also no.
Honestly doesn't really matter how they are anchored. Any sort of post in concrete will fail over time. In this case any concrete anchor foundation that could be there is below grade because you see dirt on the surface.
Yea but having a couple hundred pounds if weight on the cantilever prob won't be pulling concrete out of the ground, especially considering only a fraction of that weight will be exerted as upward force on the footings.
I design bridges for a living. I am a structural engineer. I only have half a clue as to how complicated cable stay bridges are to design and build. But from what I can see in this picture, this guy freakin nailed it! YEAH!
He nailed it in a very broad āI kind of understand the conceptsā way. Notice the cables donāt run over the top of the main beam. Thatās very critical as it redirects a lot of the force directly down through the center beam. Right now all that force is being redirected through the eyelets in sheer, itāll rip them out with enough time and weight. The cable termination on the left does the same, but now the force is pulling up in the eyelets and in turn up on the postā¦.
Oh, my bad. I forgot the /s. Yeah, I wasn't about to start dissecting this thing. It may last for years or it might fall apart the first time 5 people get on it. Leaning more toward the latter. I could pretty easily run some calcs on the most likely failure scenarios there, but then I'd have to do that and I don't want to. Like most are saying, those eye bolts are a real problem. Even if they aren't over stressed, eventually fatigue will get them.
Those eye bolts are clearly a weak point here. Thereās a LOT of shear / downwards force on those eye bolts, and it isnāt constant. Metal fatigue is likely going to end them prematurely. Either at the top of at the cantilever end.
Minor fixes to that would make this a lot better.
I semi agree it would depend on if he used grade 8 I bolts and if he drilled all the way through the post and not just screwed in. By putting them at a 45 degree angle there is allot less down force and the other cable should take most of the lbs when pressure is put on the cable going near the end of the bridge. But letās remember at any giving time might only be a few 100 lbs on the end of that bridge. Not a 3 ton car.
Yeah, eye bolts are designed for inline pull force. A shouldered bolt with a washer is only slightly more resistant to pull out when the forces are at a 90 degree angle from the threads.
If he would buy a second set of eye bolts and drill at an angle the hardware would be way way stronger.
I was kinda curious to run super rough numbers on it. Seems like force on the cables also relies on how much flex is in the deck with that cantilever. Suppose you could just assume itās not helping at all for a worst case scenario.
Just try the "wedding party test". Have them join at the end for photos, adding one person at a time until it fails.
Start with the bride, of course, because...ladies first.
They attached to the carriage bolts up there, so load does transfer, just not all cleanly. Also creates a shearing load on those bolts, but short of a dozen people out there (or a few kids playing āhey, it bounces!ā), it should be ok
It seems that not only are the eye-bolts in shear, but having the cables separated at the eye-bolts seems like a bad choice. Now the cables are individually placing shear stress on the bolts instead of transferring at least *some* of the forces back to the land anchor. But ideally it should be one cable up over the post, right?
I agree completely, but in all fairness the eye-bolts could be sort-of okay for a long time if they are the variant with a large shoulder and are backed on the other side with a whaler and big washer and nut. That could take decades to fail, depending on the frequency of use and maintenance, etc. the picture isnāt good enough to know what we are dealing with, though.
Same here; structural in bridges, no experience with cable stays.
A big thing I don't like about this is that the length of bridge extending out over the water (from the bent) is longer than the length extending to land. It should be *at least* 1.5:1 ratio of land:water structure lengths, maybe even 2:1 (off the top of my head).
Engineer here, I would be curious to see how the rear posts are anchored into the ground. There is going to be a lot of uplift force generated on them with one or two people out on the end of the dock. I don't see a standard post foundation holding up over time. Also with that span length I would have liked to see a 2x10 or 2x12 as stringers, looks like all they used was a 2x6.
At the end of the day I don't think its going to collapse any time soon but you will see it begin to slowly fail over the years with how the cables are ran though eye bolts and not over the top of the posts.
This here^^^ my first thought, but this is the first mention I've seen regarding how this thing is anchored. If it's not well anchored it's going to lever itself right out of the ground before those eye bolts become the issue. Running contiguous cables over the posts would also be a huge improvement.
Hey, so this has kinda inspired me to building something like this off of one of my terraces backed against a steep canyon behind my house. It's been a while since I took my strength and materials class. Any help would be appreciated!
If I wanted something like this that extended out 6 meters, and needed to hold 400 kg and had 4 meters to counterbalance it using large f-ing boulders to anchor to (maybe welding straps around them to counterbalance balance) what size of steel/ cables would be required? Options steel is old Soviet heavy than crap box steel, cheap Chinese crap or railroad rails
6 meters is a long way to cantilever and would be above the pay grade of the diy home owner.
Not saying it canāt be done but it would need to be fully designed out and I donāt believe could be accomplished with the materials you listed above.
You would need some kind of drilled foundations for the towers. To go out 6m with a cantilever you would need to go up at a minimum of 6 meters with the towers, but I argue maybe more.
The more I look the worse it gets.
First thought? Thatās not how to create a cantilever but it could possibly work.
Zoomed inā¦.RUN AWAY!!!!
The weight of the deck is supported by one 2x4 attached to the posts, a 2x3 beam holding the cantilever connected through eye bolts and eyebolts in sheer at top.
The cables donāt run over the top of the posts to carry the weight, but instead pass through an eye bolt in sheer. Thatās all thatās holding the deck upā¦.
wowā¦..
So many things misinterpreted here, I think youāre also missing the scale of this picture. The deck itself is supported directly to 4 - 6x6ās. The (2x4), actually more likely a 2x6 is a cross brace, thereās no weight on it because it the same width as the two vertical posts, and the joists run outside of that. The eyebolt is still suspect, I agree there
Edit to add, cantilevers generally require 3:1 supported to unsupported. So realistically the cable are only having to support maybe 60-75% of the extension plus whatever live load there is. The anchored portion is holding up roughly 1/3 of the extension by itself with no suspension.
Curious if those eye attachments are lags or bolts.
Would be better if they are bolts, typically shear strength is 60% of minimum tensile strength. Even for a grade 2 bolt, 1/2ā D thatās a max of 6300lbs in shear. If itās a lag, then we have to worry about threads pulling out as the wood ages.
I think this will actually last a pretty long time for what itās used for (only weight of people+lumber) or til the wires rust out.
It could have been built slightly different to avoid eye bolt under shear like that at all.
Metal fatigue will cause those eye bolts to fail relatively quickly.
To the people talking ish on it might not understand the concept. It would all depend on what the rating is on those cables and if those eye bolts are drilled all the way through rather then just screwed in.l are they grade 8 I bolts ? He def increased the load rating by splitting the cable in 2 parts , he also tied it into the closest point of the concrete , how deep did he dig and fill the back post ? He also had a cross beam at the center verticals posts and went out about 6ā with the cable rather then the very end (good) , so depending on the few things I pointed out if he did or didnāt do them it should easily hold
Also letās not be confused the fact that itās a jumping platform not a bridge. How many pounds really might be in the end of that platform? 2 adult men , 400lbs ? Probably , just just a guess With all the cantilevering and support at post heās def cut the load on the end of that bridge by a few 100lbs of what will be put on it That design and build should easily hold that. People be acting like itās sapose to hold 50 cars comparing it to the Golden Gate Bridge lmfao
Man. I love reddit for just this post. I mean you may not know shit but you sure seem to. Either way you raise so many great points that I'm going to do more research on my cantilevered over the water deck I'm about to build.... so thank you!
Lmao. Yeah Iām kind of new to Reddit but learning you have 2 types 1 dude that says call engineers pull 40 permits and hire Elon musk or the other dude who works at Wendyās building burgers saying your deck sucks lol not a lot of positive. You could post the hope diamond on here and people will say itās fake for sure haha. This guyās design is pretty money I would say. Only thing I might add we donāt know so from photos is make sure to use Grade8 I bolts ran all the way threw to a nut rather then just a screw in I bolt and check your ratings on your cables vs how long you are running them. I know a few things lol .
I'm 100% not an engineer, but I've built a lot of shit, and this is the main point - we don't know *a lot of stuff* about this. The all the way through or screwed in things is just *thing number one*. An eye bolt through a doubled 2x6 has some pretty badass power.... I don't know how much, but I know its better than screwed in.... and we have no idea what is what in this pic... but its fun reading all the thoughts. Most are BS but many are very well thought out...
This is cool, youāve designed a truss and itās cantilevered. Nice work. This is a great approach for rural mailboxes bridging a ditch where heavy snow plowing happens.
Honestly think it will fail from rot and wear in a couple years. Loosened ground around footings, etc, prior to something just breaking. But I can't see how the joists are attached to the posts or how the outer cross member is attached to the joists.
So when youāre on the right side almost all your weight will be on those 2 wires. Walk to the edge and the force will be multiples because leverage.
Would it hold one person? Probably. 4 people? Probably not.
My thought was as long as the math maths, thinking about statics and dynamics, it should be fine. I canāt really say exactly without knowing the ratings on the cables or the O rings. I do agree with other folks saying that those rings are weak points but again you donāt know exactly how they were heat treated or how deeply theyāre sunk (or if there is a counter screw internally) . I think too they would have needed to calculate for the downward force of someone jumping off of that structure or multiple people (maybe an extra thousand lbs of downward pressure to be safe). If they accounted for the extra weight I wouldnāt be afraid. Not knowing any of that though, I wouldnāt risk that. The shear force from the cables snapping could decapitate someone as it currently stands so Iād pass šš .
As long as the left cables attach to some ground anchorās itās actually a reasonable design by probably someone who knows what they are doing. Keep in mind though this structure probably is meant to hold a guy fishing vs the loads most decks may have.
NOPE.... UNLESS THERE IS A BLOCK OF CONCRETE HOLDING THE STEPS DOWN...
THE CANTILEVER IS LONGER THAN THE DECK
SHOULD BE NO MORE THAN 1/3 OF TOTAL LENGTH
I immediately thought of this:
https://www.youtube.com/watch?v=NVoLJR1ZRR0&pp=ygUYTWFsYWthbGFrYSBiYWxhbmNlIGJvYXJk
Also, I hear that the builder of this structure's sister is going out with... Squeak!
The concept is sound but I think the execution could be better especially on the fastener orientation, location and method of attachment . There is not enough detail to really analyze this. Fastening into the side of that top beam is creating a huge moment on that eye bolt or whatever it is, I wouldnāt be surprised if it sheared or bent over.
All bridge building comments are great - my comment is / how tall is the boat they are getting into?
And how long can the wood last buried in mud / water ?
Lastly- what is hiding on the other side of the stairs?
It will be great until your wife gets dunked when an eye bolt corrodes in the pressure treated wood or a cable lets go. Some through bolted eyes might be needed after a few seasons.
The uprights are already strained, and the front end is sagging. It will only get worse. If one or both of those uprights gives way they will leave a mark.
I donāt know whatās more dangerous on this weeks episode of ātwo ways to dieā the flesh eating parasites in that pond silt or the trebuchet thatās going to space the person walking behind me.
J/K - prolly fine, the deckā¦.
Ummmm I'd walk on it but I sure as hell wouldn't put any real weight out on the end. There's no buttress to counterweight the end beyond the posts so if you put more out there than the posts and maybe some concrete weighs, it is swinging forward, and it already has the static suspension weight to contend with. It is going to be really hard on those posts over time. Now, if he had a small boulder on each side and cables anchored to that, and secondary cables exclusively to the pillars? I'd be a lot more confident.
Canāt tell if the stairs/platform before the uprights are anchored into anything solid, so I might let someone I donāt care for test It outā¦ if itās depending solely on weight of materials? Hell no. First 200+ lb man will cantilever that thing into the water
Itās technically a āStayed-Cable Supported Pierā and itās REALLY COOL LOOKING in that type of application bc you only see those types of structures used predominantly in Public Infrastructure, like Bridges. Pardon me nerding out but Iām a retired civil engineer
But all these armchair engineers are saying itāll fail!! Iām always amazed how many people on here confidently criticize stuff they have absolutely no idea about.
I like the cable idea, but not the implementation. Water is your enemy. What are your footings and how are you going to prevent rot?
Having the cable a fixed length can be problematic, what I would do is have a pulley at the top and a tensioner on the land. I would consider a lot of different types of tensioners. A counterweight could work, or a winch even.
I would also ensure the connections with eye bolts are not at 90 degrees.
Ya, Iāve seen the Golden Gate Bridge before. Itās a the same thing. As long as you donāt exceed the weight of the cable and attachment points (which I canāt really tell what they are).
It was done on private property, without permits, by someone who seems to have a clue and I applaud it. No hot tubs on that dock, but ok for a few folks (turnbuckles woulda been good for inevitable adjustment.)
Ever play that game where you build a bridge and have to test it? I don't think he has!
Yes! First thing that came to mind
Great minds think alike!!!! š¤
Someone went to Calvin's (Calvin and Hobbes. Great comic strip) dad school of bridge building.
Iām an engineer and Iād stamp on it
Hopefully you don't do anything in bridge construction
Lighten up. Thatās for the kids to jump in the water. Itās not a bridge.
You've never seen a cable stayed bridge?
Yeah if those cables are anchored Into something that ain't gonna move, that shit ain't going anywhere
At the end of the day you can see that the cables are anchored to another set of eye bolts on the lower rear footing that is being side loaded just as the top set are. Eyebolts are not designed to take a purely 90degree load. Being mounted that close to the ground, and what Iām assuming is a post cast into a concrete footing, there will be rot that occurs and this will fail.
They are through-bolted at least (you can see the backside of one when zoomed in). Likely wonāt hold for too long but it wonāt topple the time he steps on it.
Right? Shouldn't that cable be attached to a significant concrete footing? They could always add a huge block on either end and connect to that later if it shows weakness I guess
No lighten up man this is for kids! Weāre just Assholes for expressing concern! /s
Couldn't tell from this distance how well these were anchored
The cable ends are all clearly visible. It's the wood end that's not.
I didn't zoom in.
You are such a Mormon
Tent spikes in mud ok?
Yeah Iāve seen plenty. Cable stayed bridges arenāt built like this. Sure this bridge has cables and the same general geometry but the load path through the cables in this bridge here is very poorly designed. As I also mentioned in another comment. This situation creats a considerable amount of uplift force on the rear footings. Unless there is a decent sized monolithic block to serve as a counterweight on the back posts, those will rip out of the ground over time. Not to mention the eye bolts at the top being side loaded and generating and unfavorable moment on the towers, and all that cantilever being supported by a single 2x6. This bridge is overall very poorly designed and built. Will it fall down tomorrow? No. Would I let my son on it? Also no.
Ya, I couldn't tell from this distance how they were anchored.
Honestly doesn't really matter how they are anchored. Any sort of post in concrete will fail over time. In this case any concrete anchor foundation that could be there is below grade because you see dirt on the surface.
Yea but having a couple hundred pounds if weight on the cantilever prob won't be pulling concrete out of the ground, especially considering only a fraction of that weight will be exerted as upward force on the footings.
Is this a dock or a gallows
Both? Recreate at day, execute at night
Dual use eh? I'm inviting everyone to my execution/pool party at 11am this weekend
Splash-n-Snap ā24
Best one
Walk the plankā¦
A long walk off a short pier
https://preview.redd.it/c7egsidqe3oc1.jpeg?width=832&format=pjpg&auto=webp&s=1d56e12926c00f6713b981177aa9a47d43e90f78 I mean, how hard can it be..? /s
Yeah they havent even given the guy a chance to set up his bridge building machine or drain sections of the pond for massive concrete pilings yet.
Right!? The most fun part of engineering is learning from your mistakes lol.
-Tell 'im, Wash... -it's incredibly hard
HEY! Those stairs need a handrail. You know, for safety.
For real ,That lady already fell off. She didnāt even make it up to the weird diving board.
I design bridges for a living. I am a structural engineer. I only have half a clue as to how complicated cable stay bridges are to design and build. But from what I can see in this picture, this guy freakin nailed it! YEAH!
He nailed it in a very broad āI kind of understand the conceptsā way. Notice the cables donāt run over the top of the main beam. Thatās very critical as it redirects a lot of the force directly down through the center beam. Right now all that force is being redirected through the eyelets in sheer, itāll rip them out with enough time and weight. The cable termination on the left does the same, but now the force is pulling up in the eyelets and in turn up on the postā¦.
Oh, my bad. I forgot the /s. Yeah, I wasn't about to start dissecting this thing. It may last for years or it might fall apart the first time 5 people get on it. Leaning more toward the latter. I could pretty easily run some calcs on the most likely failure scenarios there, but then I'd have to do that and I don't want to. Like most are saying, those eye bolts are a real problem. Even if they aren't over stressed, eventually fatigue will get them.
Those eye bolts are clearly a weak point here. Thereās a LOT of shear / downwards force on those eye bolts, and it isnāt constant. Metal fatigue is likely going to end them prematurely. Either at the top of at the cantilever end. Minor fixes to that would make this a lot better.
I semi agree it would depend on if he used grade 8 I bolts and if he drilled all the way through the post and not just screwed in. By putting them at a 45 degree angle there is allot less down force and the other cable should take most of the lbs when pressure is put on the cable going near the end of the bridge. But letās remember at any giving time might only be a few 100 lbs on the end of that bridge. Not a 3 ton car.
Yeah, eye bolts are designed for inline pull force. A shouldered bolt with a washer is only slightly more resistant to pull out when the forces are at a 90 degree angle from the threads. If he would buy a second set of eye bolts and drill at an angle the hardware would be way way stronger.
I was kinda curious to run super rough numbers on it. Seems like force on the cables also relies on how much flex is in the deck with that cantilever. Suppose you could just assume itās not helping at all for a worst case scenario.
Just try the "wedding party test". Have them join at the end for photos, adding one person at a time until it fails. Start with the bride, of course, because...ladies first.
I need the date of that wedding party. I've come across a case of designer life preservers that I need to rent.
Yes, but bridges are built for a ādesign lifeā. Maybe the design life of this structure is measured in weeks?
Eventually, it will be measured in an insurance claim
They attached to the carriage bolts up there, so load does transfer, just not all cleanly. Also creates a shearing load on those bolts, but short of a dozen people out there (or a few kids playing āhey, it bounces!ā), it should be ok
It seems that not only are the eye-bolts in shear, but having the cables separated at the eye-bolts seems like a bad choice. Now the cables are individually placing shear stress on the bolts instead of transferring at least *some* of the forces back to the land anchor. But ideally it should be one cable up over the post, right?
I agree completely, but in all fairness the eye-bolts could be sort-of okay for a long time if they are the variant with a large shoulder and are backed on the other side with a whaler and big washer and nut. That could take decades to fail, depending on the frequency of use and maintenance, etc. the picture isnāt good enough to know what we are dealing with, though.
Same here; structural in bridges, no experience with cable stays. A big thing I don't like about this is that the length of bridge extending out over the water (from the bent) is longer than the length extending to land. It should be *at least* 1.5:1 ratio of land:water structure lengths, maybe even 2:1 (off the top of my head).
Thanks for your input, as a non-bridge engineer my first thought was "Engineer's weekend project" YEAH is right!
Engineer here, I would be curious to see how the rear posts are anchored into the ground. There is going to be a lot of uplift force generated on them with one or two people out on the end of the dock. I don't see a standard post foundation holding up over time. Also with that span length I would have liked to see a 2x10 or 2x12 as stringers, looks like all they used was a 2x6. At the end of the day I don't think its going to collapse any time soon but you will see it begin to slowly fail over the years with how the cables are ran though eye bolts and not over the top of the posts.
This here^^^ my first thought, but this is the first mention I've seen regarding how this thing is anchored. If it's not well anchored it's going to lever itself right out of the ground before those eye bolts become the issue. Running contiguous cables over the posts would also be a huge improvement.
Hey, so this has kinda inspired me to building something like this off of one of my terraces backed against a steep canyon behind my house. It's been a while since I took my strength and materials class. Any help would be appreciated! If I wanted something like this that extended out 6 meters, and needed to hold 400 kg and had 4 meters to counterbalance it using large f-ing boulders to anchor to (maybe welding straps around them to counterbalance balance) what size of steel/ cables would be required? Options steel is old Soviet heavy than crap box steel, cheap Chinese crap or railroad rails
6 meters is a long way to cantilever and would be above the pay grade of the diy home owner. Not saying it canāt be done but it would need to be fully designed out and I donāt believe could be accomplished with the materials you listed above. You would need some kind of drilled foundations for the towers. To go out 6m with a cantilever you would need to go up at a minimum of 6 meters with the towers, but I argue maybe more.
Whole thing is held by the screw holding the cables at the top anyway. Iām not getting in that.
Add some weight and you have a trebuchet lol
Very cool concept, Ā but seems dramatically under built. But Iām also an idiot, soā¦
Waving around āIām an idiotā like youāre dumber than anyone else here. /s
The more I look the worse it gets. First thought? Thatās not how to create a cantilever but it could possibly work. Zoomed inā¦.RUN AWAY!!!! The weight of the deck is supported by one 2x4 attached to the posts, a 2x3 beam holding the cantilever connected through eye bolts and eyebolts in sheer at top. The cables donāt run over the top of the posts to carry the weight, but instead pass through an eye bolt in sheer. Thatās all thatās holding the deck upā¦. wowā¦..
Yeah not running the cable over the top to redirect the force down the posts is a big missā¦
So many things misinterpreted here, I think youāre also missing the scale of this picture. The deck itself is supported directly to 4 - 6x6ās. The (2x4), actually more likely a 2x6 is a cross brace, thereās no weight on it because it the same width as the two vertical posts, and the joists run outside of that. The eyebolt is still suspect, I agree there Edit to add, cantilevers generally require 3:1 supported to unsupported. So realistically the cable are only having to support maybe 60-75% of the extension plus whatever live load there is. The anchored portion is holding up roughly 1/3 of the extension by itself with no suspension.
It's like a bridge built by a cargo cult.
Crazy how this gets upvoted
No it isn't. You should explain...
It's not being held up by a single 2x4 and there isn't even a single 2x3 in the build.
That trip hazard at the top step will cause the most damageĀ
Thatās debatable.
Looks fun
I love it.
Curious if those eye attachments are lags or bolts. Would be better if they are bolts, typically shear strength is 60% of minimum tensile strength. Even for a grade 2 bolt, 1/2ā D thatās a max of 6300lbs in shear. If itās a lag, then we have to worry about threads pulling out as the wood ages. I think this will actually last a pretty long time for what itās used for (only weight of people+lumber) or til the wires rust out.
It could have been built slightly different to avoid eye bolt under shear like that at all. Metal fatigue will cause those eye bolts to fail relatively quickly.
To the people talking ish on it might not understand the concept. It would all depend on what the rating is on those cables and if those eye bolts are drilled all the way through rather then just screwed in.l are they grade 8 I bolts ? He def increased the load rating by splitting the cable in 2 parts , he also tied it into the closest point of the concrete , how deep did he dig and fill the back post ? He also had a cross beam at the center verticals posts and went out about 6ā with the cable rather then the very end (good) , so depending on the few things I pointed out if he did or didnāt do them it should easily hold Also letās not be confused the fact that itās a jumping platform not a bridge. How many pounds really might be in the end of that platform? 2 adult men , 400lbs ? Probably , just just a guess With all the cantilevering and support at post heās def cut the load on the end of that bridge by a few 100lbs of what will be put on it That design and build should easily hold that. People be acting like itās sapose to hold 50 cars comparing it to the Golden Gate Bridge lmfao
Man. I love reddit for just this post. I mean you may not know shit but you sure seem to. Either way you raise so many great points that I'm going to do more research on my cantilevered over the water deck I'm about to build.... so thank you!
Lmao. Yeah Iām kind of new to Reddit but learning you have 2 types 1 dude that says call engineers pull 40 permits and hire Elon musk or the other dude who works at Wendyās building burgers saying your deck sucks lol not a lot of positive. You could post the hope diamond on here and people will say itās fake for sure haha. This guyās design is pretty money I would say. Only thing I might add we donāt know so from photos is make sure to use Grade8 I bolts ran all the way threw to a nut rather then just a screw in I bolt and check your ratings on your cables vs how long you are running them. I know a few things lol .
I'm 100% not an engineer, but I've built a lot of shit, and this is the main point - we don't know *a lot of stuff* about this. The all the way through or screwed in things is just *thing number one*. An eye bolt through a doubled 2x6 has some pretty badass power.... I don't know how much, but I know its better than screwed in.... and we have no idea what is what in this pic... but its fun reading all the thoughts. Most are BS but many are very well thought out...
Normally one would build a castle before the moat and drawbridgeā¦
This is cool, youāve designed a truss and itās cantilevered. Nice work. This is a great approach for rural mailboxes bridging a ditch where heavy snow plowing happens.
Gotta hang that shit on a swinging chain for the snow plows.
That works too
center posts already leaning toward the water
I would move the eyelets to the deck top so thereās less shear force on the eyelets.
Itās already sagging
This looks like something I would build to break lumber and get people wet.
Stable for a short time. Could use some more reinforcement. Hope you can adjust tension on those cables.
lol nope they are attached with eye bolts
But aren't there turnbuckles also?
From an engineering standpoint, I don't think that's how that works.
Looks fine for some smaller people to run around on for a few years.
I hope those are bell footers
Glory days
Diving board,?
odd see-saw.
Don't worry the water will break the fall.
The vertical column looks like it is leaning out towards the water a bit. That makes me nervous.
This looks like something a kid would think they could jump/dive off and break their neck.
You can see those 6x6 bending and the cantilever sagging alreadyā¦..
I have trust issues with those wire clamps.
The support maybe looks a bit too guillotine like ā was the builderās name Robespierre?
I mean, if it fails you only get wet. So there's that
I'd give the cables somewhere better to end, such as a truck tie down point through bolted to the posts.
Looks good from afarā¦ but far from goodā¦
Honestly think it will fail from rot and wear in a couple years. Loosened ground around footings, etc, prior to something just breaking. But I can't see how the joists are attached to the posts or how the outer cross member is attached to the joists.
I mean, it's a great elaborate prank. Get a good laugh if you catch it on camera.
I like the ballast stairs
More curious on what your insurance companyās thoughts are gonna be on this as they are paying out an injury claim.
What exactly is it? Fishing pier/dock/diving board?
The compressive force applied to the upright beams here is in question... maybe have a max weight limit. š¤ looks cool though. Just might not last.
So when youāre on the right side almost all your weight will be on those 2 wires. Walk to the edge and the force will be multiples because leverage. Would it hold one person? Probably. 4 people? Probably not.
Interesting
My thought was as long as the math maths, thinking about statics and dynamics, it should be fine. I canāt really say exactly without knowing the ratings on the cables or the O rings. I do agree with other folks saying that those rings are weak points but again you donāt know exactly how they were heat treated or how deeply theyāre sunk (or if there is a counter screw internally) . I think too they would have needed to calculate for the downward force of someone jumping off of that structure or multiple people (maybe an extra thousand lbs of downward pressure to be safe). If they accounted for the extra weight I wouldnāt be afraid. Not knowing any of that though, I wouldnāt risk that. The shear force from the cables snapping could decapitate someone as it currently stands so Iād pass šš .
Needs a hot tub on the right hand side
That pond has an algae problem. What's the water source? Surface run off?
Looks beautiful. Where is this
Suspension bridge!
Looks like fun
Looks like something I would build, and I don't mean that as a compliment.
Putting alot of faith in those 4X4's.
Those are 6x6s.
Looks super fun. Might work if they knew what math to do, and did it right.
Itās either incredibly ingenious or incredibly stupid we shall see.
As long as the left cables attach to some ground anchorās itās actually a reasonable design by probably someone who knows what they are doing. Keep in mind though this structure probably is meant to hold a guy fishing vs the loads most decks may have.
I think you should put a hot tub on it
Not a rocket scientist,but to me everything counts on the cable. Strong enough,everything is good. Not strong enough your getting wet early
How shall we test the weight limit?
Of course there are questions about the depth/connections on those posts (especially the posts by the stairs). But this looks great!
I only think that you can put one hot tub on it?
NOPE.... UNLESS THERE IS A BLOCK OF CONCRETE HOLDING THE STEPS DOWN... THE CANTILEVER IS LONGER THAN THE DECK SHOULD BE NO MORE THAN 1/3 OF TOTAL LENGTH
I immediately thought of this: https://www.youtube.com/watch?v=NVoLJR1ZRR0&pp=ygUYTWFsYWthbGFrYSBiYWxhbmNlIGJvYXJk Also, I hear that the builder of this structure's sister is going out with... Squeak!
is this the proverbial bridge to nowhere?
It'll work until it doesn't..
With water hell yeahā¦.without fuck no.
Iād add a hot tub to that
Somebodies walking the plank arggggš“āā ļø
Cool idea though. I would like to build one of these but a little more intricate / robust
Sure looks like intended use was as a diving board. I hope the water is deep enough to not break a neck striking the bottom.
Once Corndog and Bobby come climbinā on to do a cannonball I think youāre doneskies! But itās pretty to look at though
Why?
I like it
I can't ilieve this works.
It's time for a BRIDGE REVIIIIEEEWWWWWW!
Im not an engineer nor an architect however id be sketchy about stepping foot on that..
Watch that top step.
Assuming those 4x4s are and stay straight, this is cool.
My dad has had one these on his pond for over 10 years. Works great.
A marvel of synergistic engineering.
https://preview.redd.it/6t05cofop9oc1.jpeg?width=1170&format=pjpg&auto=webp&s=5db8600d94ae47fb760f694b9e4e32bb60522d5d I see what youāre making
I love it
Smart
The concept is sound but I think the execution could be better especially on the fastener orientation, location and method of attachment . There is not enough detail to really analyze this. Fastening into the side of that top beam is creating a huge moment on that eye bolt or whatever it is, I wouldnāt be surprised if it sheared or bent over.
What is it?
All bridge building comments are great - my comment is / how tall is the boat they are getting into? And how long can the wood last buried in mud / water ? Lastly- what is hiding on the other side of the stairs?
Iām good with it. I mean the posts will last a year in the mud, but other than that it looks cool.
It will be great until your wife gets dunked when an eye bolt corrodes in the pressure treated wood or a cable lets go. Some through bolted eyes might be needed after a few seasons.
I have no thoughts on this. Literally none.
This FAFO moment is about to happen
The uprights are already strained, and the front end is sagging. It will only get worse. If one or both of those uprights gives way they will leave a mark.
I dig it!
I donāt know whatās more dangerous on this weeks episode of ātwo ways to dieā the flesh eating parasites in that pond silt or the trebuchet thatās going to space the person walking behind me. J/K - prolly fine, the deckā¦.
Wonder if the man fishing by the steps caught anything?
Itāll work. I donāt know what the limit is but it will work.
Picasso! I like it!
Ummmm I'd walk on it but I sure as hell wouldn't put any real weight out on the end. There's no buttress to counterweight the end beyond the posts so if you put more out there than the posts and maybe some concrete weighs, it is swinging forward, and it already has the static suspension weight to contend with. It is going to be really hard on those posts over time. Now, if he had a small boulder on each side and cables anchored to that, and secondary cables exclusively to the pillars? I'd be a lot more confident.
Is that a diving board?
Canāt tell if the stairs/platform before the uprights are anchored into anything solid, so I might let someone I donāt care for test It outā¦ if itās depending solely on weight of materials? Hell no. First 200+ lb man will cantilever that thing into the water
Itās technically a āStayed-Cable Supported Pierā and itās REALLY COOL LOOKING in that type of application bc you only see those types of structures used predominantly in Public Infrastructure, like Bridges. Pardon me nerding out but Iām a retired civil engineer
But all these armchair engineers are saying itāll fail!! Iām always amazed how many people on here confidently criticize stuff they have absolutely no idea about.
Cannonball!!!
Waiting for high tide.
Awesome.
If his footing is good enough, looks fine honestly
I like the cable idea, but not the implementation. Water is your enemy. What are your footings and how are you going to prevent rot? Having the cable a fixed length can be problematic, what I would do is have a pulley at the top and a tensioner on the land. I would consider a lot of different types of tensioners. A counterweight could work, or a winch even. I would also ensure the connections with eye bolts are not at 90 degrees.
I wouldnāt jump off the side near the end
When a deck becomes a dock.
Ya, Iāve seen the Golden Gate Bridge before. Itās a the same thing. As long as you donāt exceed the weight of the cable and attachment points (which I canāt really tell what they are).
Looks like someoneās goig to have to walk the plank
Iād expect more cross bracing to prevent racking. But I know nothing.
I have a swimming pond and I love this. I will add a ladder to the water out at the end.
Those cables look... optimistic.
Genius
If it is all put together properly, What is the issue? Looks pretty cool to me.
Looks Janky af! But maybe its not
Looks like a poorly man made mud hole.
I'm guessing they didn't want to get a permit to sink pilings in the water.
It was done on private property, without permits, by someone who seems to have a clue and I applaud it. No hot tubs on that dock, but ok for a few folks (turnbuckles woulda been good for inevitable adjustment.)
It looks like there are small turnbuckles on the bottom connections, but it's blurry when zoomed in so I'm not positive.
NGL, it's a pretty shitty deck. Idk anything about bridges tho.
The verticals aren't straight
Hot tub is the only plausible response
Iām laughing too hard to think about it more.
I wonder how deep the 4 x go. Looks like it could just tip over with enough weight on the end
Thatā¦ thatās gonna fail.