Sy k es as s i s t Thames br i dge pr oj ec t When c ons t r uc t i on i s nec es s ar y ov er r i v er s or ot her bodi es of wat er , a c of f er dam i s t empor ar i l y c r eat ed t o al l ow an enc l os ed ar ea t o be pumped bef or e pl ans c an pr oc eed. Thi s c r eat es a dr y env i r onment gener al l y c ompr i s ed of wel ded s t eel s t r uc t ur es whi c h ar e t y pi c al l y di s mant l ed onc e bui l di ng wor k s hav e been

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