Underwater construction By Namita Shedbal Downloaded from Civil

Underwater construction By: Namita Shedbal Downloaded from Civil. Digital. com

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 Downloaded from Civil. Digital. com

Underwater Construction techniques: There are two techniques : Caissons Cofferdams Downloaded from Civil. Digital. com

Caissons A 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 Downloaded from Civil. Digital. com

Types of caissons Box caissons Open caissons Suction caissons Pneumatic caissons Downloaded from Civil. Digital. com

Cofferdams are temporary watertight enclosure pumped dry below the water line to execute the building operation to be performed on dry surface. Downloaded from Civil. Digital. com

Components of cofferdams Sheet piling Bracing frame Concrete seal Downloaded from Civil. Digital. com

Components of cofferdams shown in diagram Downloaded from Civil. Digital. com

Types of cofferdams Earthen cofferdam Rock-fill cofferdam Cellular cofferdam Single walled cofferdam Doubled cofferdam Crib cofferdam Downloaded from Civil. Digital. com

Underwater concreting This is a process where the prepared concrete is poured below the water surface using suitable methods. Placement methods are: Tremie method Pump method Toggle bags Bagwork Downloaded from Civil. Digital. com

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