Types of Supported Scaffolds
A ladder jack scaffold is a system designed to perform activities, such as: installing building exteriors, trim, and finishes. Contractors widely use ladder jack scaffolds because of their cost effectiveness, portability, and quick erection and dismantling procedures, as well as their adaptability for use in narrow spaces at construction worksites. More information on this scaffold.
Pump Jack
Pump jacks are uniquely designed scaffolds consisting of a platform supported by movable brackets on vertical poles. The brackets are designed to be raised and lowered in a manner similar to an automobile jack. Pump jacks are appealing for certain applications because they can be easily adjusted to variable heights, and are relatively inexpensive. More information on this scaffold.
Real Life Scenario
In August, 1992, two workers were erecting an aluminum pump jack scaffold. As they were raising the second aluminum pole, the pole apparently contacted an overhead power line. The pole being raised was 29 feet 10 inches long and the line was 28 feet 10 inches high. The line was approximately 11 feet from the house. One employee died and the other suffered severe burns and was hospitalized. The surviving employee noted that he thought they had enough room to work around the power lines, which were not de-energized or shielded.
Knowledge Check Choose the best answer for the question.
2-3. Which of the following supported scaffolds consists of a platform supported by moveable brackets on vertical poles?
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