During precast panel erection, the crew discovers that a specified bearing pad is missing at one support seat. The crane is holding the panel in position. What should the erection supervisor do?
Correct Answer
C) Do not release the panel until the required bearing condition is provided or the engineer approves an alternate
A precast panel should not be set on an unapproved bearing condition; the required pad or an approved alternate must be in place before release. Other choices: direct bearing, plywood shims, or longer welds do not substitute for the specified bearing support.
Why This Is the Correct Answer
A precast panel should not be set on an unapproved bearing condition; the required pad or an approved alternate must be in place before release.
Why the Other Options Are Wrong
Option A: The crew should set the panel directly on concrete and grout later, leaving precast erection bearing unverified
The trap in A is Set the panel directly on concrete and grout later. That selection is wrong because it solves the wrong trade problem; the field result tied to Precast erection bearing is Do not release the panel until the required bearing condition is provided or the engineer approves.; Precast components require the specified bearing condition before load transfer.
Option B: The crew should use scrap plywood temporarily under the panel
Choice B gives Use scrap plywood temporarily under the panel. Its specific error: it points to Use scrap plywood temporarily under the panel, but.
Option D: The crew should increase weld length at the connection to replace the pad
In concrete work, Increase weld length at the connection to replace the pad is the wrong selection for Precast erection bearing: it treats Precast erection bearing as optional.
Memory Technique
Remember precast erection bearing by its jobsite consequence: the correct move points to Do not release the panel until the required bearing condition is provided or the engineer approves an alternate.
Reference Hint
Open Erectors' Manual - Pre-Cast Concrete Products, PCI, 2nd Ed., 1999; use the index entry or section for "Precast erection bearing pads and temporary support" to confirm that A precast panel should not be set on an unapproved bearing condition; the required pad or an approved alternate must be in place before release.
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