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-THE BITCOIN BORACAY ISLAND LIFE-

This is how bridge foundations are built in the middle of water. The image shows a cofferdam, a temporary structure used to build foundations in water. Steel sheets are driven into the ground around the work area to form a barrier that prevents water from entering.

Then the water inside is pumped out, leaving the area dry. Once the area is cleared, excavation begins until a solid base is reached and concrete foundations are laid to support the bridge. Once completed, the cofferdam is removed and the water returns to surround the new bridge foundations.

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Discussion

Ingenious!

I wonder how they determine how far the metal sheet walls need to be driven down.