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How are the bridges on the Thames built? How do they make it stay on the bottom, coz surely they can't dive down under the water with cement because the cement would get all washed away by the water. Do they drain the water out first or what?
No best answer has yet been selected by thepheebster. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.In some fast flowing rivers a tube can be sunk into the river bed and the water is then pumped out. Supports and concrete are then placed inside the tube.For bigger areas steel sheet piling is driven into the river bed and the water is pumped out and then the supports are built inside. These is known as a coffer dams or caissons.