For shoring a trench with screw jacks, how many crew members are needed to set the jack screws?

For shoring a trench with screw jacks, how many crew members are needed to set the jack screws?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (B)

The task tests safe, controlled setup of trench shoring under load. When adjusting screw jacks, two crew members are required because one person must turn the screw while the other stabilizes the jack, guides the seat, and watches for proper alignment and any binding or movement. This teamwork keeps the load secure, prevents the jack from shifting suddenly, and ensures the bearing surfaces seat evenly. Rushing or trying to do it alone can lead to misalignment, binding, or a loss of control, which are serious hazards in a trench. Therefore, two crew members are needed to set the jack screws.

The task tests safe, controlled setup of trench shoring under load. When adjusting screw jacks, two crew members are required because one person must turn the screw while the other stabilizes the jack, guides the seat, and watches for proper alignment and any binding or movement. This teamwork keeps the load secure, prevents the jack from shifting suddenly, and ensures the bearing surfaces seat evenly. Rushing or trying to do it alone can lead to misalignment, binding, or a loss of control, which are serious hazards in a trench. Therefore, two crew members are needed to set the jack screws.