How Strong Are LEGO Bridges Actually?!

Ajouté : 2026-05-10

[00:00:00]Hey, what's up YouTube? We're back with another reaction video. Of course, my name is Tommy the Lego. I do content like this weekly. I try to post a short-form video every single day. So, if you want more content, follow me on Instagram, TikTok, and YouTube. I post shorts every single day.

[00:00:18]Um we're going to be doing more long-form content like this. I'm going to try to drop two videos a week. If you like this more long-form content, uh leave a comment, subscribe, like the video. Let me know you like it. If you guys like it, I'm going to continue to keep posting more of it. Uh so, let's go ahead and get into the video. This guy's testing Lego bridges. Uh such an interesting uh concept, man. People that can build and and make their own creations out of Lego are so creative.

[00:00:44]Bro, when I try to build stuff out of Lego, I get garbage. Like, I'm not good at making my own creation. But, let's see what this guy got into, man. I know this comes with a lot of uh engineering and uh a lot of a lot of need to know how actual uh building mechanics work. You know, I know how to build in Fortnite, but I don't know how to build actual real-life bridges. So, let's see what this guy actually does to make these bridges so strong. It can hold up a lot of weight.

[00:01:10]So, we're going to build up some Lego bridges. Starting with the most basic bridge design, an arch bridge. It literally just has an arch. But, ours going to need to be pretty long cuz we have a 4-ft pool of water we're going to be driving these vehicles over.

[00:01:23]So satisfying, the clicks. Now that we got a solid foundation, we can start building the arch. We're going to build this in two halves. So, what I'm going to do is just grab a brick and go out one stud.

[00:01:32]And then, we can go maybe two out as long as we just increase Like, look at this guy's little background here, man. You can just tell this guy's a genius, bro. Anyone that can make a Lego microscope, you just know this guy's on a different wavelength than us. least the number, we can get an arch going. I'm just going to keep building and hopefully we'll get something strong enough to drive the cars over. As you can see, we're getting some headway here. Now, we're overlapping on this side by three studs, and pretty soon I'm just going to do a band that goes across, so the arch will just be on the sides. So, the reason this is actually super unique, every layer you go down, it divides the weight into the layers below it. So, any pressure up top is divided all the way down. Kind of similar to how a heavy object becomes lighter when you have a friend to move it with you. If we build it like this, it'll be really strong.

[00:02:14]So, now I've just got to build one more of these, and we connect it with a road up top and test it out.

[00:02:19]Okay, so we have the bottom part of the arch bridge. Now, I'm just going to take the top of this bridge and snap it down on top of here. Then, we just got to gently push this down on the edges [music] here. That should snap in. So, here we have the first bridge, the arch bridge, all set up. I have the Corvette as the first car in the video, and I've done two things. First, I've built this little adapter for the top here. And that's going to allow us to put different weights on the car, so we can see how much weight each one of these bridges can handle. And then the second thing is I've built up this winch system using [music] a LEGO motor and a worm gear.

[00:02:44]Like, bro.

[00:02:47]How? How did you build this? You know how long it would take me to build something like this?

[00:02:52]And that will actually pull it across.

[00:02:53]So, we attach our little clip there.

[00:02:54]We've got to get our Ublock crash test dummy inside the vehicle.

[00:02:57]If we just crush just a little bit like that. All right, here we go. Let's test.

[00:03:01]I'm going to turn this on, flip the switch, and we're going to see if it can pull it across. Oh my gosh, this is nerve-wracking. Is [music] it going to move? It's going. It's moving. I'm so nervous. I'm so nervous. It has to make it all the way across for it [music] to count.

[00:03:15]All right, we made it all the way across. Let's up it to 10 lb.

[00:03:20]Okay, it's moving. Oh no, I don't think it's going to work. I think it's going to crash right when it gets to the [music] middle.

[00:03:27]Steer it back. Okay, 10 lb in the middle of the bridge. Both wheels are not happy right now. They are not rolling under that weight.

[00:03:35]Dude, this little winch is working perfectly. It just pulled 10 lb successfully across this bridge. The arch bridge is a complete [music] success. As you can see, our Ublock guy, he's totally fine. So, let's build up the next bridge and test the next car.

[00:03:46]For the next bridge, I want to build a tensegrity bridge, which has never been done before, because it's A what?

[00:03:53]I guarantee you if you're watching this video, name five bridges. Name five different types of bridges. super unsafe and wouldn't work in real life, but it might work in like The first thing we got to do is build up a road and then we'll build a tensegrity part underneath it.

[00:04:08]All right, so now that we got the road for the second bridge done, it looks a lot like the road for the first bridge, but now we're going to build the tensegrity things that are going to actually hold this up. If you're not familiar with the term tensegrity, it's this concept where you have two platforms and three ropes and they link together in such a way where it looks like the top platform is floating. So I'm thinking we build a tensegrity on each side of the bridge, so it'll technically be floating and possibly wobbly. So we're going to start with a base plate for the bottom. So let's build a quick base on top of this.

[00:04:36]And I'm going to attach some Technic bricks right here separated by a couple plates and that way we can put the hook in it. Put two plates and another Technic brick and now this should stand up straight.

[00:04:45]Nice. We just got to build this thing up to be a little taller then go out in this direction.

[00:04:53]Now So now that we have this first hook, we just need to make another one that we will invert and put upside down. Then we'll build up a simple base on top using plates and link together the whole thing with ropes.

[00:05:06]>> [music] >> Now that we got this, we just need to tie it together with ropes here and then on every corner. And theoretically this top part That was legitimate. I'm so tired.

[00:05:15]Theoretically this Sorry about the ads, y'all. You know we we're not allowed to skip any ads. We have to watch them. [snorts] I can't put it out the video.

[00:05:34]On the second video people were people were very, very generous and eager to help and part with loot. So I cut all these ropes. These just slide onto here.

[00:05:43]So if we hang this top part by these four ropes, as you can see, it doesn't float. That's not how it works. So, what we actually have to do is take this rope here and tie it onto that. And then, once we do that, as you can see, there we have our floating tensegrity. Look, it's completely floating. Like, just check that out. You can float it. That's so cool. And my thought is we could just put each side of the bridge on top of that, like [music] that. We got to make these arms a little stronger, but that is super promising. Now, let's build one more of these and we'll put it on each side of the bridge.

[00:06:13]I've absolutely no faith in this bridge, but we're going to take our top and just put it right on top of here. I feel like he cheated. Those are not LEGO ropes.

[00:06:20][music] Falling apart already, guys.

[00:06:22]This is the wobbliest bridge ever.

[00:06:24]So, here it is. We have our tensegrity bridge. I have no idea how this is going to work.

[00:06:29]I'm not going to put any weight on this one because I don't even [music] think the car will make it across, but we'll grab U-boat. We'll put him in the passenger side. He doesn't fit perfectly inside the cars, but he fits well enough to test. And then, we'll take our hook, like that. Will a bridge made of tensegrity actually work?

[00:06:44]Here we go.

[00:06:45]All right, it's moving.

[00:06:48]The weight is holding. As you can see, this is held up entirely by tensegrity.

[00:06:54]No way.

[00:06:55]I think it's actually going to work.

[00:06:59]No way. We made it to the other side.

[00:07:01]We're going to try 2.5 lb.

[00:07:04]Oh, no. This is so, so nerve-racking.

[00:07:06]Seriously. I'll turn the wheels so it doesn't steer off.

[00:07:11]It's right in the middle, dude. This is great.

[00:07:14]Now, I'm curious, can we add 5 lb right here?

[00:07:22]5 LB.

[00:07:27]IT'S GONE. YOU KNOW, THE ACTUAL BRIDGE part held together a lot better than I was expecting. As you can see, we have our tensegrity. It didn't actually break. It just came [music] loose.

[00:07:36]We got U-boat in the water here. How did he do?

[00:07:39]>> [laughter] >> Apparently, LEGO cars float, everybody.

[00:07:42]By the way, get your U-lock down below link in the description. We just restocked the crash [music] test dummy buildable figures. So if you want one of these to use in Lego crash test is really fun to build and it's totally possible so you can put it in like any pose. Link down the description. We also still have a bunch of mini figures left so grab those two. That's 10 security.

[00:07:58]On to the next bridge. So the next bridge I want to build is called a truss bridge. The cool thing about this bridge is all the structure is on top of the bridge. So there's really nothing under it to keep it from falling down. And the way it accomplishes that is by using triangle. For example, you can see here if I build two shapes on the square all these points can actually hinge. So when you put pressure on it it collapses. But on the triangle none of these points can move around. So as soon as you apply any pressure on it it is extremely sturdy from any angle. So for the truss bridge we're going to combine a bunch of these all the way down which will turn our floppy bridge into a sturdy structure.

[00:08:29]So first I'm just going to build up a quick road for this and then we'll attach the trusses to the sides. I always like to start these off the same way just a bunch of 16 by 16 plates which I can lock together with tiles.

[00:08:39]You have no idea how loud it is when I have all these bridges.

[00:08:46]So we got our two bridge pieces. Now as you can see it's very very floppy. So I'm going to line this with two layers of technic bricks and then I'll add some to the sides as well so we can attach the trusses. And then as you can see what it's doing is it's just coming up right there. So the whole point of using these is we need to connect them. So what I like to do is just grab some of these three long pins and then since we're already connected the plates I just like to push it through.

[00:09:05]From the outside. Sometimes I use my hammer.

[00:09:07]You just got to make sure you put four in each brick so that it has two points.

[00:09:11]Have y'all ever used a hammer for Lego?

[00:09:15]I just force it in with my thumb.

[00:09:17]Connection on each thing. You just got to do this all the way down.

[00:09:21]I've never seen someone hammer Lego.

[00:09:25]So now we need to integrate these technic bricks on the side here. And while we could just do that probably should cuz it'll be easier. I want to cover up all these colored things. So I'm going to use some bricks. And then we'll sandwich our technic brick like that. And that'll give us a way to attach the trusses inside there, which should make it pretty strong.

[00:09:41]So, now we got our bridge built up. And as you can see, it is very wobbly. Let's build up some trusses. So, we're going to take two of these. We're just going to connect each end like this. [music] And now we have our triangle structure.

[00:09:50]The bottom part of this is going to snap right into the bridge.

[00:09:56]As you can see, the rest of this is bending a lot, and this part is just totally not. So, now we just continue this technique all the way down on both sides, and I think that'll really, really make this strong.

[00:10:05]You can see here on the top layer, I'm just adding a single lift arm, or a couple that are latched together, to lock [music] everything.

[00:10:11]Bro, like why is this dude building Lego?

[00:10:13]Like, who did Shouldn't he Shouldn't he be doing something else?

[00:10:17]I feel like he he he has the knowledge to go build a rocket. together.

[00:10:26]All right, check this out.

[00:10:28]>> [laughter] >> That is a flat bridge, and that is looking really, really strong.

[00:10:31]>> Look at that. It's crazy that just that little detail. It's like the strongest one I've built so far. For this bridge, we have the red pickup truck. We're going to put it right here, and then I just built this little thing into the bed, so we can put more weight on the top. I think he'll actually fit in here, you guys. Oh, now there's a giant door mechanism in the way. Well, we can get half of Ubulot in there. I'm pretty confident in this one, so I'm going to start it at 10 lb.

[00:10:51]Here we go.

[00:10:52]>> [music] >> The truss bridge is such a cool technique. Oh, it's moving. Will it make it across? The only thing I'm a little worried about is [music] the plates on the bottom, cuz they're 16 by 16 plates.

[00:11:00]That's the only weak spot. I think the sides will stay together.

[00:11:03]>> [music] >> We have Ubulot in there.

[00:11:06]Just chilling. Here it goes. It's in the middle of the bridge. Oh, it's kind of bending right here. Something's about to snap. Oh, no. Oh, no. No.

[00:11:13]Oh. The trusses have come off the side, but Did we break the winch? No, it just came off. Oh, man. I'm going to call that a fail.

[00:11:22]There's no way that car was getting across after that, so. Hey, but honestly, 10 lb took it to the very That was not a fail.

[00:11:30]If I'm on a bridge, and I'm on that second bridge and we just go straight into the ocean with all the sharks, that's a fail. But, hey, if your bridge sinks down a little bit and I'm still in my car and I'm dry, I respect it. Preferably, I'd like to, you know, go across the bridge completely unharmed and not poop my pants, but uh yeah, if you prevent me from uh drowning or being eaten by jaws, middle of the bridge. And you can see I was just about to say you can see the triangles haven't broken, but check out the damage.

[00:12:06]Blue blocks good. Not the man he used to be. Yeah.

[00:12:09]>> [laughter] >> You can see the plates in the tiles just snapped here and then these came off the sides, but it works pretty well. So, that's a truss bridge for you. The next one though is going to actually use motors to work. So, let's check out that one. So, the next bridge I want to build is a drawbridge, which is basically just a bridge that opens up that where ships can go underneath it. So, I think I'm going to repurpose our winch system and build a couple more beams for each >> drawbridge on each Booking.com has all kinds of stays because a city hotel is right for some, ooh, but not quite right for others.

[00:12:38]We've got to support the channel.

[00:12:40]>> Find exactly what you're booking for.

[00:12:41]Booking.com >> got to we got to support the channel, man.

[00:12:49]This hurts.

[00:12:51]Guys, so basically I have a base with a large tower that comes up and then we'll have a rope attached to that that'll actually bring up the other side of the bridge. Kind of unsure how we're going to make this hold up the weight in the middle. So, let's start by building a base.

[00:13:05]That's so satisfying.

[00:13:09]Guys, big brain move. Since there's going to be so much weight on the center of the bridge and we don't want it to collapse since it's not attached, we're going to put weights on the edges to kind of counterweight it. So, we'll build like 10 lb on each side of this and that should at least give it a good chance.

[00:13:21]That's got to be cheating.

[00:13:23]That is not a LEGO weight.

[00:13:25]>> the bridge actually able to attach to this, what I'm going to do is integrate some Technic bricks in the sides here.

[00:13:29]That is not a LEGO certified >> up the bridge. We'll just make sure to include some Technic connections on it.

[00:13:33]Now, for the actual tower structure, I think I'm going to build up two long arms out of Technic brick, kind of like I did for the tensegrity. That way we can mount the winch system to the top.

[00:13:43]>> [music] >> I go deep inside this.

[00:13:47]This may not be pretty, but it will be functional.

[00:13:49]>> Oh, that looks so cool.

[00:13:49]>> up one more of those on this side.

[00:13:51]>> [music] >> So, to make the winch on this thing so it actually works, I'm going to use a worm gear. We should be able to feed an axle through somewhere to a motor to get that motorized. Push this long axle through.

[00:14:04]See. Now, we take these guys and go through just like that, and we should be able to connect this [music] to that.

[00:14:12]Okay, that piece goes there. Now, we turn this on.

[00:14:15]This thing spins, and it'll make our winch actually pull something up. Now, we just need to attach two ropes to this axle, and then once we attach it to the bridge, we'll have a functioning drawbridge. The last thing before we connect this all together is just the bridge part, the [music] important part.

[00:14:27]And then specifically, because I want to and not because they make base plates in that color, we're going to use green.

[00:14:32]And once we got our Technic bricks and our base plates in place, we just need to lock down a bunch of bricks on top of it and add some Technic in the middle to make it strong so it doesn't fold. Guys, leave a like if you appreciate how many bricks I've had to place [music] this video. Honestly, it's kind of just normal for the tips of my fingers to have little indentations where the studs are. It's so much fun though.

[00:14:47]>> apart. [music] Again [music] with the hammer.

[00:14:57]All right, we got the first one done up here. I'm thinking it might work. All I got to do is duplicate this, and we'll test it out.

[00:15:03]We're going to put our weights on the inside of this here. So, we're going to do 20 lb each.

[00:15:08]Now, with those weights in place, Ah. Let's see. So sus. All we have to do is just use this little remote, and that tells the IR receivers in the winches to unravel it.

[00:15:18]Nice.

[00:15:21]Imagine he gets it first try.

[00:15:23]Boom.

[00:15:23]>> There's no Here we go. The next vehicle we have for this is the Porsche convertible. It's convertible now because I had to take the top off to put the weight thing on. We're going to put Ubleck inside like this.

[00:15:34]And what I'm going to do is just put this up slightly on each side. That way when it gets to the middle, I'm hoping the tension will push these down enough to where they'll be flat.

[00:15:40]>> to sell us this Porsche.

[00:15:42]And now, you can just clip this underneath the car. For this one, I'm going to start with 2.5 lbs.

[00:15:47]>> got no morals, man. Start winding it up, it'll go across. I think it might be able to make it over the gap, but I'm a little nervous that it just won't line up right. Oh no, it's creaking.

[00:15:56]It's going down.

[00:15:58]Come on, you can do it. You can do it.

[00:16:00]No! Oh, even with all those weights, too.

[00:16:07]It's still going. Wait, it can bring it out of the water.

[00:16:10]It's pulling it out of the water. Well, I mean, to be perfectly honest, half of it's still there. So, there's that.

[00:16:18]There it goes.

[00:16:20]This winch is awesome. This is so cool.

[00:16:23]Hey!

[00:16:25]All right, we made it across the bridge, but half of it fell, so technically it's a fail. If I would've had more weight >> This bridge is half successful.

[00:16:33]And my favorite car is still alive, which is the best part. Let's build the next one. The next bridge I want to build is a suspension bridge. The Golden Gate Bridge is actually a suspension bridge. It's basically just a long road with pillars in the middle and then reverse arches that are all connected to hold the bridge together. So, first I'm going to build the road with Technic bricks along the sides like we did for the last one. And that's really easy.

[00:16:51]And then, we're going to build the suspension arches, which we'll have to attach to two large pillars. I'm just going to do what I did for the drawbridge, basically build two long pillars that come up out of Technic.

[00:17:01]What I'm doing here is just building up a shell on the outside of the Technic.

[00:17:05]Have y'all ever seen like the the steel rope that goes through the Golden Gate Bridge up close? Like from far away, it looks like tiny like steel rope that's kind of holding it all together.

[00:17:18]But bro, when you see like a person climbing it, oh my god.

[00:17:21]That thing is huge. structure that way, it'll be a lot stronger. I ran out of red Technic bricks, so >> [music] >> My thought is we should build it down a little bit further and that will attach to the legs, which will just go underneath.

[00:17:41]So as you can see, this is a little bit wobbly, which is the whole point of suspension bridge to actually make it so it's not wobbly anymore.

[00:17:48]I wish we could >> to do is use a bunch of these Technic lift arms and attach them to the sides to make ropes that will arch around and go to the other side. We just snap all these together with these little Technic pins.

[00:18:01]Look, we're getting the triangle shape again. That is how triangles work.

[00:18:07]Okay, now that we have the arches on there, my thought is we just literally take some lift arms and attach them at different intervals. If we got some Lego axles, you can actually put these on the inside of these bricks.

[00:18:19]Now we're getting something going there.

[00:18:20]Check it out. I think the looseness of these Technic bricks is going to be a problem because these can literally just pull up. So we're going to need to put another layer of bricks over that and then build it up on the sides. But I think once we get that locked down, it should be a lot stronger. And hopefully when we put it over the pool, it'll actually hold together.

[00:18:37]All right, and now that we have the structure of our bridge, all we got to do is build two pillars down to the floor under these two areas.

[00:18:43]Bro, I know that sounds so >> [music] >> All right, there we have it. We have two little legs on the bottom, so that is strong there and that is strong there. I don't know how strong it is in the center, but we're going to test it out and find out. The last and probably heaviest vehicle is the Lego Volkswagen van. So I'm going to put a little Ubleck on the inside. He's chilling. And for this one, I'm going to put 10 lb cuz I'm super confident in this bridge. Here we go. Click on the winch.

[00:19:06]Let's see if it works. This one took a really long time to build, but I'm so confident in the technique. Oh, it's moving. It's crossing the bridge.

[00:19:13]This is so much fun, literally. Just watching it each one of these go across.

[00:19:16]The suspense on this bridge is crazy.

[00:19:19]Oh, here we go. It's about to enter at its weakest point. Almost past the middle of the bridge. Dude, no way. We might have to load more weight on this actually. You're so close to the end, you could do it.

[00:19:29]It successfully [music] made it to the other side of the bridge. I'm going to add 5 more pounds. All right, here we go.

[00:19:35]That's it, we did it. We've made it across with 15 pounds. [music] I'm really curious if we set the car in the middle, how much is going to take to crash this. 10, 15 pounds, 30 pounds.

[00:19:46]35 pounds, 45 pounds.

[00:19:51]>> [laughter] >> That was it. 45 pounds on this Lego bridge. Look at that. That's so cool.

[00:20:03]You guys thanks for watching this video.

[00:20:04]Check out one of these two popping up on your screen and make sure you check out this video's sponsor, Crazy That was definitely the best bridge towards the end, the Golden Gate Bridge.

[00:20:13]50 pounds is actually crazy. You could You could put like a 2-year-old child on that bridge and it would have probably held up. Uh but yeah, if y'all enjoyed the video, definitely subscribe, leave a like, and uh comment if you want to see more content like this from me. Uh comment down below which video you want me to react to next. For sure, I'll definitely do it. If you comment, I'll definitely get around to it and react to a video, even if it's one of your videos. If you made Lego content and you want me to react to your video, I got you. Let's do it. Other than that, appreciate y'all watching. Have a good one.