NCCCO Tower Crane Erection, Climbing, and Dismantling 2

Question 1

Who must supervise tower crane erection and dismantling?

Accepted Answer

A competent person with specific knowledge of the tower crane model and the manufacturer's erection/dismantling procedures

Answer

OSHA requires a competent person specifically knowledgeable about the tower crane model being erected/dismantled. This person must understand the manufacturer's procedures and potential hazards.

Question 2

What is 'climbing' a tower crane?

Accepted Answer

The process of increasing the tower height by inserting new tower sections, allowing the crane to grow taller as the building rises

Answer

Climbing involves hydraulically jacking up the top section of the crane and inserting a new tower section underneath. This allows the crane to increase in height as construction progresses.

Question 3

What is the greatest hazard during tower crane climbing operations?

Accepted Answer

Structural instability during the transition when the crane is temporarily supported by the climbing frame rather than bolted tower connections

Answer

During climbing, the crane's upper structure is temporarily supported by hydraulic jacks rather than permanent bolted connections. This creates a period of reduced stability where precise procedures are critical.

Question 4

What weather condition most affects tower crane erection and dismantling?

Accepted Answer

Wind — tall, lightweight tower sections and boom components have large sail areas and are extremely sensitive to wind at elevation

Answer

Tower crane components are long and relatively lightweight, creating large sail areas. Wind at elevation is typically stronger than at ground level, making component handling dangerous in even moderate winds.

Question 5

What must be verified before each climbing operation?

Accepted Answer

Hydraulic system integrity, climbing frame bolt torque, tower section alignment, weather conditions, and clear communication between all crew members

Answer

Pre-climbing checks include hydraulic system inspection, climbing frame integrity, bolt torque verification, weather assessment, communication check, and confirmation that the area below is clear.

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO Tower Crane Erection, Climbing, and Dismantling 2