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Figure 4-18 Drilling a hole and installing an expansion bolt
1. Drill a hole at the marked position to a depth of 52-60 mm using a hammer drill with a
Ф14 mm bit.
Wear safety goggles to prevent dust in the eyes when drilling holes. Wear an anti-dust
respirator to prevent dust inhalation when drilling holes.
Vacuum any dust in or around the holes using a vacuum cleaner and measure the distance
between holes. If the holes are inaccurately positioned, drill new holes.
2. Partially tighten an expansion bolt, vertically insert it into the hole, and drive the
expansion bolt completely into the hole using a rubber mallet.
3. Remove the M10x60 bolt, spring washer, and flat washer by rotating them
counterclockwise.
Ensure that the top surface of the expansion sleeve is level with the surface of the concrete
wall after removing the bolt, spring washer, and flat washer. Otherwise, the rear panel will not
be securely installed on the wall.
Step 3 Align the rear panel with the holes, insert expansion bolts into the holes through the rear panel,
and tighten the expansion bolts to a torque of 30 N·m using a torque wrench with a 17 mm
open end, as shown in Figure 4-19.
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