Figure 4-12 Drilling a hole and installing an expansion bolt (unit: mm)
To prevent dust inhalation or contact with eyes, wear safety goggles and an anti-dust
respirator when drilling holes.
Vacuum any dust in or around the holes using a vacuum cleaner and measure the hole
distance. If the holes are inaccurately positioned, drill holes again.
1. Drill a hole in a marked position to a depth of 52–60 mm using a hammer drill with a
Ф16 mm bit.
2. Partially tighten an expansion bolt, vertically insert it into the hole, and knock the
expansion bolt completely into the hole using a rubber mallet.
3. Remove the bolt, spring washer, and flat washer by rotating them counterclockwise.
Level the front of the expansion sleeve with the concrete wall after removing the bolt, spring
washer, and flat washer. Otherwise, the rear panel will not be securely installed on the
concrete wall.
Step 3 Align the rear panel with the holes, insert expansion bolts into the holes through the real panel,
and tighten the expansion bolts to a torque of 45 N·m using a torque wrench with an 18 mm
open end, as shown in Figure 4-13.
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