0 a large box filled with air that allows people to work underwater, for example while building bridges
A cofferdam with double sides, composed of charred stakes fastened together with ties, should be constructed in the appointed place, and clay in wicker baskets made of swamp rushes should be packed in among the props.
The whole was built in a cofferdam, quite dry, and the opening was a holiday.
The city built a cofferdam to allow the lake to be refilled while the northernmost bladder was replaced at a later date.
A cofferdam was constructed and extensive excavation and investigation of the riverbed occurred before the second abutment on the northwestern side could be sited.
Then, a 200 ft cofferdam was constructed to enable the removal of another dam section in the same way.
The cofferdam enabled the water inside the dam to be pumped out and the foundation built in the dry.
A further 160 temporary anchor piles and ties have been installed to provide restraint for the cofferdam wall.
A cofferdam may be a void (empty) space or a ballast space.
