A pole designed to support a large billboard sign was being erected in Central Florida in May, using a telescoping boom crane, when somehow it fell. Bramblett was in the basket of a Vehicle-Mounted aerial lift. Despite being told not to, he tied the basket to the pole. When the pole started to fall Bramblett tried to cut the basket free of the pole which was temporarily being held up by the aerial lift. The weight of the pole was too much for the aerial lift and the basket was ripped from the boom sending it and Keith Bramblett 40 feet to the ground.
What made the billboard pole fall?
The crane didn’t overturn, so the pole must have been rigged improperly. Lifting a large pole from horizontal to vertical and aligning with the base mounting bolts is no easy trick, though the technique is well known. Rigging a large pole can be difficult if there are no weldments to attach to. Using a basket or choker hitch around the pole would not have been adequate rigging to lift it to a vertical position. If the rigging had been done improperly, the pole could have slip out of the slings.
Why was the man basket tied to the billboard pole?
Workers are required to connect their fall protection harness to a proper anchor in the basket. They’re required to only tie off the basket if they are going to get out of it at elevation, which obviously isn’t the case here. The OSHA investigation will determine why the load fell but we may never know why Bramblett tied...
When a load that is too heavy is lifted from the ground, the hoist limit device may stop the lift. However, when a load that is too heavy is lifted in the air, like this one, there is no forgiveness and it has no place to go but down.
The boom on this 220 ton capacity crane was overloaded while attempting to place an air conditioning unit on a building. Although the load was considered light, it was too far away causing the crane to tip. The operator managed to stop the tipping, but in doing so, created forces that bent the boom.
Read the entire story at Vertikal.net