Concrete, Masonry, and Formwork Safety Flashcards

Lifting inserts embedded in tilt-up precast panels must be capable of supporting at least how much of the maximum intended load?

Answer: Two times

1926.704(b) requires tilt-up lifting inserts to support at least two times the maximum intended load applied or transmitted.

Lifting inserts for precast concrete members other than tilt-up panels must support at least how many times the maximum intended load?

Answer: Four

1926.704(c) requires a safety factor of four for lifting inserts in non-tilt-up precast members.

Lifting hardware used with precast concrete must be capable of supporting at least how many times the maximum intended load?

Answer: Five

1926.704(d) requires lifting hardware to support at least five times the maximum intended load.

In lift-slab operations, what is the maximum allowed variation in lift between jacks?

Answer: 1/2 inch

1926.705(g) requires jacking to be synchronized so that the variation between jacks does not exceed 1/2 inch.

Who must design lift-slab operations per OSHA 1926.705?

Answer: A registered professional engineer experienced in lift-slab construction

Lift-slab operations must be designed and planned by a registered PE with lift-slab experience.

What must lift-slab jacks and lifting units do when overloaded?

Answer: Be designed so they will not lift or continue to lift

Jacks must be designed and installed so they will neither lift nor continue to lift when loaded in excess of their rated capacity.

Until permanent connections are complete, how must precast wall units and tilt-up panels be handled?

Answer: Adequately supported to prevent overturning and collapse

1926.704(a) requires precast members to be adequately supported against overturning and collapse until permanent connections are completed.