This task is to lay the foundation for firmly conveying the building's own weight to the ground.
To embed the steel frame in the ground in order to prevent soil collapse. And then to flatten the ground and cover it with concrete. Digging a hole towards the strongest supporting layer in the ground and making a pile to support the building with concrete. Process the pile head and put the rebar out in order to connect the underground pile with the building to be built in the future.