Cable Car

[Derbyboy]

I was thinking of attaching each "foot", i.e. four pieces with posts in the rock.

 

[Dan_Johansson]

As mentioned, you need to work with triangles..

What you've drawn needs to be braced diagonally anyway, and I don't think a simple 45x195 rule, loaded on the "wrong edge," is enough...

I also don't think it will be cheaper than three of these; https://www.jemfix.se/byggtimmer-im...0IBiMOTI_np467MoUdxoCejQQAvD_BwE&gclsrc=aw.ds

 

[Derbyboy]

I agree that the crossbeam is too weak. It needs to be stronger, but it also depends on the distance "width" between the crosses, i.e., how long the crossbeam should be.

Regarding construction timber or 45x195, I actually don't understand why construction timber would be better. 195 handles much more load than 140 (construction timber). The side forces and shear forces can be improved with diagonals and crosswise joists.

The advantage of a regular joist like 45x195 is that it's easy to attach both to the cross itself (preferably with 2 bolts) and to the rock.

 

[Dan_Johansson]

195x45 has a cross-sectional area of 8775 mm2
120x140 has 16800 mm2 ...

If you follow your latest drawing, there is likely no advantage with construction timber...

If you make triangles, i.e., three pieces of construction timber and attach the wire behind (which I definitely recommend), you will only get compression forces in the wood, and then you need to avoid the wood bending... Construction timber resists this much better due to the doubled cross-sectional area....

I would have bought flat iron, 100x10, and notched a groove in the middle of the construction timber. Then I would have drilled the holes diagonally in the rock and fastened reinforcement bars with chemical anchors... Then I would have erected the construction, (at the top I would have cut the outer beams at an angle and then threaded a rod through all three) and finally welded the flat iron to the reinforcement bars....

Edit; the artist has taken a vacation

 

[AXS]

Very good suggestion above!

 

[Derbyboy]

Thank you so much!

It's precisely this maneuver that I think I'll have trouble with:

I don't believe my skills are enough to pull that off.

 

[Dan_Johansson]

You can handle it with a handsaw and a Forstner bit in the appropriate size... 👍

Start by figuring out what would be a reasonable triangle...


Approximately 2.5 meters wide and deep seems reasonable... gives a height of about 2.5 meters as well...

 

[Dan_Johansson]

Then draw everything in 2 dimensions;


Then lay the timber flat on the ground and measure out the placement, then you can saw with the side of the saw blade against the other log;



When you've sawn both, mark where you want the threaded rod to go through;


Then you can take the logs apart and use a square to draw on the "inside", then drill the angled logs one by one "from the inside"....

 

[Derbyboy]

Haha, really thank you.

Is it two legs backward and one leg forward in the cable direction?

 

[pmd]

CAD programs (which I guess are what's shown in post #38) can do strength calculations, right?

 

[AXS]

2 forward, in that direction most of the force goes and it doesn't obstruct the track as much.

I also don't think the angle is super critical; if you cut approximately as in the picture above, it should be fine. But keep in mind that the two legs forward must be fixed in the ground at the same height or you have to adjust for it. You don't want the entire construction to lean.

 

[Dan_Johansson]

CAD programs (which I guess is what is shown in post #38) can do structural calculations, right?

It's SketchUp, I don't think it can do that, and it definitely can't in the free version... 😂
Features keep disappearing to the paid version all the time...