Underground electric cable pipe - using inflatable elastic tube inside spiral reinforcement surrounded by cylindrical shuttering

摘要

The underground concrete pipe for electric cables is created by digging a rectangular trench. Circular spiral reinforcement is lowered into the trench together with a longitudinal spade plate. The reinforcement is surrounded by circular shuttering and an elastic tube placed within the spiral. The tube is inflated to the required internal diameter of the pipe and concrete poured between it and the shuttering. The shutters are removed when the concrete has set and the trench is back filled. The level of the pipe is checked at ground level height gauge resting against the spade plate.