Caissions are typically made of steel or concrete, and they are often constructed in sections that are then assembled on site. The bottom of the caisson is usually sealed with a layer of concrete or grout, and the sides are typically reinforced with steel beams or bars.
To install a caisson, it is first excavated into the ground until it reaches the desired depth. The water is then pumped out of the caisson, and the interior is inspected for any leaks. Once the caisson is dry, the construction work can begin.
Caissions can be very dangerous to work in, and there are a number of safety precautions that must be taken. These precautions include:
* The caisson must be properly ventilated to prevent the buildup of toxic gases.
* The water level inside the caisson must be monitored constantly to prevent the caisson from flooding.
* The caisson must be structurally sound to prevent it from collapsing.
Caissions are an essential tool for the construction of many underwater structures. They provide a safe and dry working environment that allows construction workers to perform their jobs effectively.