07-18-2018, 04:15 AM
(07-17-2018, 11:41 PM)GtwoK Wrote:(07-17-2018, 08:44 PM)ijmorlan Wrote: Are the tubes caissons for the drill? Maybe they’ll start the excavation for the building but just redirect any soil that needs treatment to whatever treatment it needs. Dig it up just once.
If this is correct, most likely they’ll start by installing piles, probably massive vertical I-beams, around the outside using the caisson drill then dig down, installing wooden shoring as they go.
Can't say I know what a caisson is, but the spiral drill piece fit almost perfectly inside the tubing. Definitely looked like pile-driving equipment
An aside: oh my god, I've just realized THAT'S where pile driving comes from!?
Probably a caisson. A caisson is, uh, large tubing that fits almost perfectly around an augur (which is a spiral drill piece
). It holds back the surrounding soil during excavation. Once they have drilled down to the required depth, they pour it full of slurry (essentially concrete) and drop the I-beam in. Then pull the caisson out and proceed to the next pile. It’s also possible to drill a bunch of holes right next to each other, resulting in a continuous wall of slurry that looks a bit like a log cabin (except the round “logs” are vertical). This way no shoring is required. This is how the sides of the LRT tunnel under the expressway were done.Pile driving means pounding the I-beam directly into the ground with a large (i.e., truck-sized) hammer.