Importance

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Abstract

An immersed dam foundation and a dam structure are formed in a body of moving water by forming a plurality of spaced piers having temporary support posts thereon. A current deflector is secured to the upstream support posts and sheet piling walls are driven to form upstream and downstream walls between the piers forming a base therebetween. The base is covered with a tremie seal and the walls cut off so that a prefabricated dam structure can be floated to a location above the tremie seal and lowered onto anchor points on the adjacent piers and secured to the piers and tremie seal. An exposed face of a pier is protected from the currents by barriers that serve as a portion of the next upstream and downstream walls, with gravel covered by precast concrete pads. The access galleries of adjacent prefabricated dam structures are closely aligned and seals provided therebetween.

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First Claim