Risers at the Charlotte Coliseum were built in 2 1/2 months using three-piece forms that cast a complete pie-shaped section of the arena in one placement. Because the 33-riser form would have been too difficult to move in one piece, it was built in three pieces which were bolted together after they were set in place. Each piece was made of individual steel riser forms, three or four steel channels, and one wide-flange steel carrying beam. The steel riser forms were held together by the 12-inch steel channels. The steel carrying beam was used by the crane to pick up the entire form section and also to carry the concrete load during casting.