pneumatic caisson
Học thuậtThân thiện
Definition
Noun: A pneumatic caisson is a large, watertight, pressurized chamber used in construction to allow workers to perform tasks in a dry environment below water level or in waterlogged ground. It is a type of foundation engineering structure.
Usage
The term is used in civil engineering, construction, and architectural contexts to describe a specific method for building foundations, bridge piers, or other structures in wet conditions. - It is a technical, compound noun. The word "pneumatic" refers to the use of compressed air to keep water out of the working chamber. - It is typically used in its full form, "pneumatic caisson."
Examples
Advanced Usage
- The concept is often discussed in relation to historical engineering projects (e.g., the Brooklyn Bridge, the Eads Bridge) and in modern geotechnical engineering.
- The pressurized environment inside the caisson can pose health risks, such as decompression sickness ("the bends"), leading to the term caisson disease.
Variants and Related Words
- Caisson: A more general term for a watertight structure used in construction. A pneumatic caisson is a specific type of caisson.
- Open caisson: A caisson that is open at the top and bottom, which is sunk into place and then filled with concrete.
- Box caisson: A prefabricated watertight box that is floated to the site and sunk onto a prepared base.
- Caisson disease: A medical condition caused by rapid decompression, historically associated with workers in pneumatic caissons.
Synonyms
- Compressed-air caisson
- Pressurized caisson
Notes
- This is a highly specialized technical term. In general language, the simpler term "caisson" may be used, but "pneumatic caisson" specifies the use of compressed air.
- It should not be confused with a caisson in military contexts (an ammunition wagon) or in artistic contexts (a sunken panel in a ceiling).
Noun
- large watertight chamber used for construction under water