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Difference Between Open Caissons and Pneumatic Caissons
Difference between well or open caissons and pneumatic caissons are as follows:
1. Structure
➤ Open caissons are box-type structures having their top and bottom open.
➤ Pneumatic caisson consists of an enclosure open at the bottom and closed at the top.
2. Cost
➤ Open caissons are relatively cheaper than pneumatic caissons.
➤ Pneumatic caissons are relatively costlier due to the use of compressed air in the working chamber.
3. Inspection
➤ Inspection and cleaning process at the bottom of the caisson can not be carried out in case of open caissons.
➤ But in the case of pneumatic caissons cleaning and testing process can be easily carried out, as the working chamber is dry.
4. If boulders are faced during construction
➤ The construction process will be slow and difficult if the boulder met during construction.
➤ No problem arises in case of Pneumatic Caissons.
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