Lowering Duct Into a Shaft Without Controlling Rotation

Before the section enters the opening, confirm the approved handling plan, support points, communication, and how rotation will be controlled. A long section can turn, bind, or strike the shaft wall even when its weight is supported.

Stop if

• We have the riser section staged at the shaft opening. I checked the opening, receiving elevation, and connector orientation. What is the approved handling and rotation-control plan before this section enters the shaft?

Watch out

• Do not improvise a lowering method, stand below an uncontrolled section, or use the shaft wall as a guide surface.

Check

• Identify the section length, shape, connector orientation, and center of balance.
• Check the shaft opening, wall framing, installed services, and receiving position below.
• Confirm the lead communicator and stop command.
• Verify the approved temporary support and transfer sequence.

Steps

• Identify the section length, shape, connector orientation, and center of balance.
• Check the shaft opening, wall framing, installed services, and receiving position below.
• Confirm the lead communicator and stop command.
• Verify the approved temporary support and transfer sequence.

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