By Namita Shedbal Introduction Underwater construction is a method on how to place the concrete underwater It is opted when the foundation is most likely to lie underwater Construction ID: 1019085
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1. Underwater construction By: Namita Shedbal
2. Introduction Underwater construction is a method on how to place the concrete underwater.It is opted when the foundation is most likely to lie underwater.Construction in water poses many difficulties especially where the depth is considerable. The main objective is to create dry and water free environment the stability of the structure is well balanced
3. Underwater Construction techniques:There are two techniques :CaissonsCofferdams
4. CaissonsA caisson is retaining water tight structure used to work for the construction of a concrete dam, on the foundation of a bridge pier or for the repair of ships
5. Types of caissons Box caissonsOpen caissonsSuction caissonsPneumatic caissons
6. Cofferdams Cofferdams are temporary watertight enclosure pumped dry below the water line to execute the building operation to be performed on dry surface.
7. Components of cofferdamsSheet piling Bracing frame Concrete seal
8. Components of cofferdams shown in diagram
9. Earthen cofferdamRock-fill cofferdamCellular cofferdamSingle walled cofferdamDoubled cofferdamCrib cofferdamTypes of cofferdams
10. This is a process where the prepared concrete is poured below the water surface using suitable methods. Placement methods are:Tremie methodPump methodToggle bagsBagworkUnderwater concreting
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