Bridges are built over water by different methods (depending on the level of water and quality of the soil). The first method is used for bridges that are built-in low depth water. In low depth water, the foundation of the bridge is laid by filling the particular location for a temporary period, over which piers (a type of pillar can be built). Otherwise, when the soil is not favorable in the top layer for constructing a bridge, temporarily rigs are erected, and piles are constructed deep inside the river bed. Then the bridge can be built either by taking support from the already constructed piers, or by temporary platforms / mud-islands in the water, or through barges (though rarely in fewer depth waters).
The next method is for the bridge to build over a deep water body (river or sea). Cofferdam technique is used in this case. In this method, a wall enclosing an area is build inside the water, and water is continuously pumped out from the area. After that, the foundation of the bridge(the pillars) is constructed inside the cofferdam as the construction place is sea or river itself. Therefore, 24-hour monitoring is required outside the cofferdam to check the high tides of water. Bridges build using this technique are strong and carry heavy loads.
And the last technique is called Case Drilling. This is the most advanced technique. In this technique, a watertight chamber keeps the water away with the help of air pressure. Then a sealed tube chamber is fitted inside the chamber. After that, a long drill is put inside the tube, and then the drilling process starts. Water filled during this process is pumped out. After that, a case is inserted into the hole which is drilled inside to give extra support. In this way, a stable frame is created. This frame is filled with concrete. Then pillars are build and hence the bridge.
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