KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY
Tilt-up concrete construction. Construction workers holding a concrete wall as a crane lifts it into place on the foundations of a new building. They are using a method of construction called tilt-up or tilt-slab. Modular concrete elements such as walls and columns are made on a concrete slab (usually the building floor) and are tilted from a horizontal to a vertical position using a crane. Photographed in British Columbia, Canada.
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