Hello!
I'm planning to cast a pillar directly on rock where it's quite uneven. You might not see it well in the pictures, but there's a small edge closest to the foreground that's about 15-20 cm from the bottom, marked in red. There's also a higher edge to the left of it, marked in green. I plan to cast a pillar inside the red-marked and green-marked edges, with this area marked in yellow. There's a small dip in the yellow-marked area that needs to be leveled out to be able to place a pillar there.
My options are, I assume:
1. Pin reinforcement bars at the bottom that are 1.3 m high, i.e., almost the entire length of the casting tube, and put a large chunk of concrete at the bottom to level it out and let it set. Then I'll cast the tube on this concrete block.
2. Pin as above but fill with crushed stone to even it out and cast the pillar on the crushed stone along with the reinforcement bars.
A. Can a little soil remain in the above options, or does it absolutely have to be completely rock clean, entirely free of soil?
No soil should be left.
Clean the rock and anchor as you planned, then first cast a ledge if you want, otherwise, it works well to cast the whole thing at once.
No soil should be left.
Clean the rock and bolt as you intended, then first cast a base if you want, otherwise it works well to cast it all at once.
Thanks for the answer!
Just to be super clear:
By base, do you mean I do as in option 1, that is, bolt and then cast a small concrete block?
By "cast it all at once," do you mean I bolt and then fill the hole with concrete, place the casting tube on the concrete block that the hole has been filled with, which hasn't set yet, and then pour the rest of the concrete into the casting tube and let everything set at the same time...?
I've never cast a foundation post before, so I just want to be clear about everything =)
What's the easiest way to get the rock completely free of soil? Vacuum cleaner? =) Or water?
By pouring at once, I mean that you fit the form tube against the rock so that the concrete doesn't leak out, and then it's just a matter of filling it with concrete.
larsbj said: