SafetyCâu 655 / 700
A supported scaffold is being erected on graded soil. What is the BEST practice for the scaffold's footing?
a.Set base plates on mud sills or another firm, level foundation capable of carrying the load without settling
b.Rest the legs directly on loose backfill to allow drainage
c.Support the legs on stacked concrete blocks or bricks for height adjustment
d.Place the legs on the spoil pile since it is close to the work
Giải thích
Correct: scaffold legs need base plates bearing on mud sills or another firm, level, load-rated foundation so the scaffold cannot settle or shift. Loose backfill, stacked blocks or bricks, and a spoil pile are all unstable, unequal supports expressly discouraged because they can crush, tip, or sink under load, collapsing the scaffold.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Who must inspect a scaffold for visible defects, and how often, before it is used?
- CALCULATION: A free-standing supported scaffold has a minimum base width of 5 feet. Using the common 4:1 height-to-base ratio, at what height must the scaffold first be tied, guyed, or braced to the structure to prevent tipping?
- On a large jobsite a scaffold tagging system is used at access points. A worker sees a YELLOW tag on a scaffold. What does this MOST likely indicate?
- CALCULATION: A portable straight ladder rests against a wall where the top touches the wall 16 feet above the base. To meet the 4:1 pitch rule, about how far out from the wall should the ladder's feet be placed?
- A ladder is stamped 'Type IA.' What MAXIMUM working load (duty rating) does this designation indicate?
- A crew must work near exposed energized electrical conductors. Which ladder choice is BEST for this task?
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