Hi,
I am planning to build a dock with an overhang of 2 meters.
In the winter, I will remove a support at the waterline, so the overhang will instead be 2.5 meters.
The total length of the dock is 4 meters and the width is 2 meters.
The joists used are 75x200. Three pieces. Extending over the water.
I'm wondering if the dock will start to sag in the winter because of the 2.5-meter overhang?
I am planning to build a dock with an overhang of 2 meters.
In the winter, I will remove a support at the waterline, so the overhang will instead be 2.5 meters.
The total length of the dock is 4 meters and the width is 2 meters.
The joists used are 75x200. Three pieces. Extending over the water.
I'm wondering if the dock will start to sag in the winter because of the 2.5-meter overhang?
Perhaps I should add that the length of the bridge may change. I will check when it starts to sway too much. On the land side, the joists are anchored into the rock with through-drilled Threaded rod m20 and post shoes.
Someone?
Well, I suppose you have to expect that, but I imagine that most of the snow would normally be blown off a dock that is 4x2 meters.
Snow zone 2
Could you perhaps build a suspension bridge? Place 2-3 meter high standing posts where the overhang begins. Run a cable on each side from the end of the pier over the posts and secure it to the rock at the other end of the pier. Then a 2.5 m overhang should not be a problem.
With L1 at 2000 mm, B at 4000 mm (to simulate an overhang of 2000 mm) and C at 1000 mm with a load of 2.3 kN/m2 (of which 2 kN is snow load), the following is obtained.D Derbyboy said:
There was no construction timber that could withstand the load, so it was glulam.
https://www.byggbeskrivningar.se/dimensionering/altan-utan-takkonstruktion/
Thank you @Kane
But I'm not quite sure if you can calculate like that as you did. I haven't quite grasped if I understand how you're accounting for the overhang in your calculation.
I have modified the measurements slightly. The bridge is still 4 meters long.
But I'm not quite sure if you can calculate like that as you did. I haven't quite grasped if I understand how you're accounting for the overhang in your calculation.
I have modified the measurements slightly. The bridge is still 4 meters long.
Suppose you're afraid the ice will take the dock if you keep the supports at the far end?
Isn't there a sturdy tree nearby that you can use for support then? Pull a strap or wire a bit up the tree and a Y that attaches to the outer corners.
Spontaneously, it seems like 75*200 should be quite sturdy and not bend down so easily.
Isn't there a sturdy tree nearby that you can use for support then? Pull a strap or wire a bit up the tree and a Y that attaches to the outer corners.
Spontaneously, it seems like 75*200 should be quite sturdy and not bend down so easily.
Yes, it's the ice I'm afraid of.
No trees, unfortunately!
No trees, unfortunately!
Start with 2 or 3 parallel railway tracks and you will have stable things to attach to. Then you don't need to account for any deflection at all. Anchor them firmly in the rock and they will stay put for a long time......
Where can you find railway tracks?
Can probably forget about tracks because of the weight.
Can probably forget about tracks because of the weight.
Doesn't say much. If I buy a 45x220 beam and let it project 90 cm, I don't think the long-term deformation can be measured, nor any sag.Viktor.J said:
The sag I feel becomes a minor problem. I'll buy the 75x200 beam in a length of 4.80 and cut it where the sag is acceptable.
What I'm after is the long-term deflection at different overhangs