The foundation work has been carried out for months. First metal tubes were inserted into the ground, then the digging work was done by tube-like dual shovels which would dig out a limited amount of soil from the ground each time. The soil would be carried away by trucks.
Next more cranes moved in and the digging work was abandoned because it would take much time. The soil inside the metal tubes was removed by water pouring in and muddy water sucking up by pumps into tanks. When the soil inside the tubes had been removed, round network of steel bars were inserted and then concrete was poured in to set. Well, this kind of making piles was done every day and it was quick indeed.
There are a few questions I have in mind.
(1) How can such kind of work be done with so many machines around?
(2) How can the workers know the exact spots to make the pile?
(3) How can the concrete be set underground?
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