Sewer pipes in concrete formwork

[ElecTriX]

I believe that a form made of raw wood with triangular strips in the corners, pulled together with something like a threaded rod, will suffice for all 38 castings, but the question is whether it might be better to order a divisible sheet metal form from the nearest sheet metal workshop?

That would certainly be an option depending on the cost. Isn't there a greater risk of it sticking to the metal than with wood? Or maybe it doesn't matter because of the rapeseed oil?

I was planning to make the form with OSB boards, is raw wood more recommended?

 

[fribygg]

That would absolutely be an alternative depending on the cost. Isn't there a greater risk of it sticking to the metal than with wood? Or does it not matter because of the rapeseed oil?

I was planning to make the form with OSB boards, is raw pine more recommended?

It releases more easily from smooth metal forms without a lot of unnecessary details, formpyfa is probably the best if you want wood material and do not need/desire the life that the form boards give to the casting. OSB is a cheap substitute as far as I know and is best suited for covering floors during construction time.

 

[BSOD]

That would definitely be an option depending on the cost. Isn't there a greater risk of it sticking to the metal than with wood? Or does it not matter because of the rapeseed oil?

I had planned to make the mold with OSB boards, is tongue and groove more recommended?

If you're going to use the same mold many times, I would recommend form plywood.

https://www.byggmax.se/formplywood

I think tongue and groove is a bit more dimensionally stable than OSB, but it depends on the height of the mold, the thickness of the OSB you choose, and how you reinforce it to hold together. I've cast with both materials with good results. A 20cm high mold has quite moderate lateral forces.

 

[fribygg]

If you're going to use the same form many times, I would recommend formplyfa.

[link]

In my opinion, råspont is a bit more form-stable than OSB, but it likely depends on the height of the form, the thickness of the OSB chosen, and how it's reinforced to hold together. I've cast with both materials and achieved good results. A form that's 20cm high has quite moderate lateral forces.

Why not build the form sturdy and cast the pillars standing up? Lifting and handling those pillars by hand afterward seems unnecessarily heavy.

 

[BSOD]

Why not build the form sturdy and cast the pillars standing? Raising and handling those pillars by hand afterwards seems unnecessarily heavy

Relevant question, I also prefer to cast on site.