Precast concrete tilt-up construction: Reinforced concrete wall section has been pulled up at its top into near vertical position to form section of outside wall of building. Wall section is heavily reinforced concrete that was cast in horizontal position on top of floor slab of building, which alleviated the need for wall forms. It is lifted by steel cable, hooked to wall at a 8 points to provide force sufficient to break wall free from the slab beneath it and lift it into its final vertical position. Two point support from lifting beams/ harness and pulleys provide independent support to each lifting point. Pipe with screw jacks at end align the wall and support it against wind forces. Workers 3, 5, and 6, from left to right, hold chain/cable with which they will jerk out pens locking the lifting cables to the slab wall, and they will next pull to withdraw pens to separate lifting tools from the wall. Phoenix, Arizona, November 2006.
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