Actually not a problem to solve via the app, but I seldom use pool lighting.D Derbyboy said:Thanks, it has a good wow-factor on one of those. Important that it syncs with the pool lighting too.
Thinking a little...
I actually don't think such an extreme beam is needed. As I understand it, the beam on the long side will only be loaded during the opening and closing moment. That is, no snow load, no dance party on the deck, etc. The deck should only support itself and the extra water wood and plastic absorb over time. Which, in turn, can be quite a lot.
I would start by weighing the middle of the long side to see what kind of weights we're dealing with. Weighed with a classic lever scale in the form of a bar, wooden beam, or similar. My 100kg on one end, the wooden deck on the other.
Or whatever you have access to.
Then in with a lighter but heavily pre-tensioned beam that keeps everything straight when the weight is applied.
But then the problem might be that the long side stands like a spring bow when it's dry and light?
That probably doesn't look very fun either...
Or a thick wire attached to the top ends of the long side beam and the bottom in the middle, like a low wide V so you can adjust the sag with a turnbuckle. But maybe that would mean constant adjusting whenever it rains or dries?
Maybe a thick beam is good after all
Slightly pre-tensioned...
I actually don't think such an extreme beam is needed. As I understand it, the beam on the long side will only be loaded during the opening and closing moment. That is, no snow load, no dance party on the deck, etc. The deck should only support itself and the extra water wood and plastic absorb over time. Which, in turn, can be quite a lot.
I would start by weighing the middle of the long side to see what kind of weights we're dealing with. Weighed with a classic lever scale in the form of a bar, wooden beam, or similar. My 100kg on one end, the wooden deck on the other.
Or whatever you have access to.
Then in with a lighter but heavily pre-tensioned beam that keeps everything straight when the weight is applied.
But then the problem might be that the long side stands like a spring bow when it's dry and light?
That probably doesn't look very fun either...
Or a thick wire attached to the top ends of the long side beam and the bottom in the middle, like a low wide V so you can adjust the sag with a turnbuckle. But maybe that would mean constant adjusting whenever it rains or dries?
Maybe a thick beam is good after all
Slightly pre-tensioned...
Perhaps others have responded in the topic with good advice _ I don't believe his drinking beer helps. Such a construction needs to be stiffened with some form of pre-tensioning or a type of diagonal cable arrangement that can be tensioned with turnbuckles and adjusted over the years.Bernieberg said:
Below you see the formula for the deflection of a beam supported on two supports with a distributed load (formula at the bottom).
Q = total load [N]
l (small L) = length [mm]
E = material's modulus of elasticity [MPa]
I (capital i) = moment of inertia of the cross-section [mm^4]
[image]
With units above, the deflection is obtained in [mm]
Steel has E = 200,000 MPa and aluminum has E = 70,000 MPa.
You can get assistance with the moment of inertia on this site:
[link]
Enter dimensions in [mm]. Use I_x.
Example: Box profile of steel with thickness 3 and inner dimensions 45x195 with length 8400 mm and 500 kg distributed load:
deflection = 5/384 x 500 x 9.81 x 8400^3 / (200000 x 6706773) = 28 mm
Now it's time to open a Friday beer and start calculating
I don't believe solely bolting an aluminum beam to untreated wood will help. It will just follow the wood. You need a rolled version like a leaf spring.
I read it's for pool cover and that's lucky because I imagine if there are kids around, they could fall over the pipe sections sticking up for the ladder mounting. But an adult could also trip and get one of those pipes in themselves if unlucky. Perhaps consider the pinching risk when the entire block goes under the upper plane. Make sure children don't play with the start button by themselves.
I think we have come to a good solution now. I will use steel beams and 3 mm steel plates on the load-bearing beams. (Switching to 170*45 from 120*45)S SiggeFyrst said:
We have also tested with steel wire, but unfortunately, that didn't work either. I forgot to mention that earlier…
Regarding the ladder, all pool ladders are mounted in the same way. I've actually never heard of such an accident, but there must be a first time for everything. We'll solve this regardless when we replace the liner as we build a staircase in the pool simultaneously.
Regarding pinching risk for children, it's minimal. Partly because the opening and closing are managed via a mobile app. Also, the motor has built-in protection that causes it to bounce with an emergency stop if something gets in the way. And finally, there are two open passages for escape (actually for the cat, but an adult can easily fit through).
Hello again! I'm working on taking exact measurements for the beam order. I'm counting on a 35 mm raised beam.
But... When weight is applied to the beam, it will bend down. Won't that make the beam longer? It should be pushed out to the sides and then push away the short sides?
Great to see you're backHuggedugge1 said:
Hello again! I'm in the process of taking exact measurements for ordering the beam. Counting on a 35 mm elevated beam. But… When the weight is applied to the beam it will bend down. Won't that make the beam longer then? It should extend to the sides and then push the end sides away?
First, I want to emphasize that the discussions and suggestions in this thread should be seen as drafts based on loose assumptions. I recommend you have someone who can take a bit more time look over the dimensions to get it right the first time.With that said, let's move on to your question. As an analogy, we can think of a bow that is drawn by 35 mm and where the string is 8 m long. If I hit the calculator right, the bow's curvature radius is then 228 m and the arc length becomes 8.00041 m. So a difference of less than a millimeter.
To get a feel for it, you can also compare it to a folding ruler, which can sometimes be a bit wobbly and bend a bit when measuring, for example, on a ceiling. A 35 mm deflection on an 8 m beam can be likened to a 2 m folding ruler that bends 9 mm. If you measure like that and then lay the folding ruler flat on the board and saw, the board usually doesn't end up noticeably too long
Sure, I'm on it!!! Hard to find anyone who knows this better than you and the others who have contributed! Extremely grateful for all the help!
And thanks for the clarification! I'm using exact measurements for the balken.
Hard to find anyone who knows this better than you and the others who have contributed! Extremely grateful for all the help! And thanks for the clarification! I'm using exact measurements for the balken.
How's it going?
Well… A bit of a problem. Bought a capped steel beam as advised. Haven't laid the decking yet but doubt it will sag. Also added 7 pieces of 3mm bent plates as support in the structure.
but… it seems like the short sides are sagging despite the increased number of wheels. The last half meter is sagging so the beam hits the track. Or the wheel mounting is bending.
We will fix it tomorrow/today Sunday so let me get back to you.
but… it seems like the short sides are sagging despite the increased number of wheels. The last half meter is sagging so the beam hits the track. Or the wheel mounting is bending.
We will fix it tomorrow/today Sunday so let me get back to you.
As it should be….
a huge THANK YOU for all the dedication in this crazy project. In the end, everything seems to work!
Plainly, I replaced everything except the decking. From 120*45 to 170*45. Reinforced with 6 pieces of 3 mm steel plates 170*45, so the deck is completely stiff.
Also added an over-height steel beam in the section that extends over the pool. Length 833 cm. Inner dimension 195 mm high, edge of 45 mm and 70 mm respectively, which the deck's support rests on. Material thickness 12 mm. Over-height 50 mm. Sags absolutely nada, so over-heightening the beam is debatable.. Can easily invite 20 people for a Shottis festival on the deck. (Though probably won't happen…) Regardless - I am incredibly super satisfied!
Also replaced the 7 cm foam with 5 cm. The old one hasn't absorbed any water at all.
Opens and closes with app and remote control, which was my goal.
Once again - a huge thank you for all the help! You know who you are!
a huge THANK YOU for all the dedication in this crazy project. In the end, everything seems to work!
Plainly, I replaced everything except the decking. From 120*45 to 170*45. Reinforced with 6 pieces of 3 mm steel plates 170*45, so the deck is completely stiff.
Also added an over-height steel beam in the section that extends over the pool. Length 833 cm. Inner dimension 195 mm high, edge of 45 mm and 70 mm respectively, which the deck's support rests on. Material thickness 12 mm. Over-height 50 mm. Sags absolutely nada, so over-heightening the beam is debatable.. Can easily invite 20 people for a Shottis festival on the deck. (Though probably won't happen…) Regardless - I am incredibly super satisfied!
Also replaced the 7 cm foam with 5 cm. The old one hasn't absorbed any water at all.
Opens and closes with app and remote control, which was my goal.
Once again - a huge thank you for all the help! You know who you are!
Wow, how fun that it works
Awesome project and I'm impressed that you didn't give up. Back in February, I probably would have ordered a truck of gravel and filled everything in.That elevation probably isn’t a bad idea given the small allowable deflection and the splendor gets heavier when the decking is wet. Looks straight and nice on the video anyway.
Sit on the lid with an umbrella drink and enjoy the summer
Great!
With all my heart! Super thanks! ❤️Wow, how fun that it works
That superelevation is probably not a bad idea since there was such a small allowed deflection and the structure gets heavier when the planking is wet. It looks straight and nice in the video anyway.
Sit on the lid with an umbrella drink and enjoy the summer
I must admit that I was skeptical but you finished strong. I tip my hat. Really well done and I am impressed!