29 CFR 1926.703: Requirements for cast-in-place concrete

Question 1

A concrete contractor has stacked single post shores in two tiers to support a deck form. During the pre-pour walkthrough, the site safety technician finds the following: the design was prepared by a qualified designer, the posts in both tiers are vertically aligned, and the splices are made so the posts cannot shift out of alignment. Bracing at the splice level exists in only one direction, and the individual tiers have no diagonal bracing. Which deficiency must be corrected before concrete is placed?

1. AThe splices must be removed because tiered single post shores may not be spliced
2. BThe shores need diagonal bracing in the top tier only, since the lower tier is supported by the slab below
3. CThe vertical alignment of the posts must be replaced with a horizontally staggered arrangement so loads spread across the tiers
4. DThe shores need bracing in two mutually perpendicular directions at the splice level, and each tier must also be diagonally braced in those same two directions

Question 2

A contractor is using a vertical slip form to build a tall concrete core. The jacks climb on steel pipes. Above the concrete, the pipes pass through an open section where they are not encased. The foreman says the pipes were specifically designed for climbing and no bracing is needed. What is the correct response?

1. ABracing is needed only if the pipes are longer than the form height
2. BThe pipes need bracing only after the concrete reaches full strength
3. CNo bracing is needed because the pipes were designed for the jacks
4. DThe pipes must be adequately braced where they are not encased in concrete