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caisson - Encyclopedia.com (1223 words) |
 | The open caisson is a cylinder or box, open at the top and bottom, of size and shape to suit the projected foundation and with a cutting edge around the bottom. |
| Workers leaving a pneumatic caisson after hours of labor under high pressure are given special decompression treatment to accustom them to the lower atmospheric pressure and thus to prevent caisson disease (see decompression sickness). |
| Caissons are also sometimes used for closing the entrance to dry docks or as a substitute for gates in canal locks. |
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Caisson - LoveToKnow 1911 (472 words) |
| A caisson in this sense implies a case or enclosure of wood or iron, generally employed for keeping out water during the execution of foundations and other works in water-bearing strata, at the side of or under rivers, and also in the sea. |
| An example of a caisson with a water-tight bottom is furnished by the quays erected alongside the Seine at Rouen, where open-timber caissons were sunk on to bearingpiles down to a depth of 94 ft. below low-water, the brick and concrete lower portions of the quay-wall being built inside them out of water (see Dock). |
| The term caisson is sometimes applied to flat air-tight constructions used for raising vessels out of water for cleaning or repairs, by being sunk under them and then floated; but these floating caissons are more commonly known as pontoons, or, when air-chambers are added at the sides, as floating dry-docks. |
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