Joints in gravity dams
GALLERIES IN GRAVITY DAMS

Joints in gravity dams

JOINTS IN GRAVITY DAMS The joints that are necessarily provided in the dam may be classified under two heads. 1. Construction joints, and 2. Contraction joints. 1. Construction Joints. The concreting of the dam is not done at a stretch but in stages. Each stage of the concreting is known as lift. Lift is nothing but thickness of a horizontal layer of concreting laid once. In concrete dams the thicknessof each layer or in other words the lift, is kept about 1.5 m.   The horizontal joint between two successive lifts is known as construction joint. The lift or thickness of each concreting layer is decided so that cooling of the concrete, while setting, may be effectively accomplished by natural as well as artificial agencies. Thickness of lower most layer of concreting is kept half i.e. about 0.75 m. Modern techniques of treatment of surface before laying the new layer…

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