Figure 7-13 Drilling a hole and installing an expansion bolt assembly
(1) M10x80 bolt (2) Nut (3) Spring washer (4) Flat washer (5) Expansion tube
1. Use a hammer drill with a φ12 bit to drill holes perpendicularly with the wall at the marked
anchor points. Ensure that the depth of each hole ranges from 55 mm to 60 mm (2.17 in.
to 2.36 in.).
WARNING
Take proper safety measures before drilling holes to protect your eyes and respiratory tract
against dust.
2. Use a vacuum cleaner to clear dust inside and around the holes, and then measure the inter-
hole spacing. If the spacing is too wide or too narrow, drill holes again.
3. Tighten each expansion bolt slightly and place them perpendicularly into each hole.
4. Hit the expansion bolt using a rubber mallet to enable the expansion tube to completely
enter the hole.
5. Remove the M10x80 bolt, spring washer, and flat washer from each expansion bolt
assembly in sequence.
CAUTION
After disassembling an expansion bolt assembly, ensure that the top of the expansion tube
is on the same level as the wall. Otherwise, the BTS3902E cannot be installed on the wall
evenly and securely.
Step 4 Fit the mounting piece on the expansion bolt, and then use a combination wrench (17 mm [0.67
in.]) to tighten the expansion bolt to 25 N·m (221.27 lbf·in.), as shown in Figure 7-14.
BTS3902E WCDMA
Installation Guide 7 Installing a BTS3902E
Issue Draft A (2011-06-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
7-11
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