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Chapter 2.
expansion of the grouting bolt. To clear material from the hole a vacuum cleaner is
used.
2.5.
EXPANSION BOLT
The Expansion Bolt of high grade malleable iron consists of segmented shield with
an internal expander nut (same as the English Rawl bolt specification). The steel
ferrule (cup) fitted on the top provides for a limited amount of compression which
enables the machinery/equipment to be clamped tightly against the mounting
surface.
In Bolt Projecting type (BP type) expansion bolt which has an internal expander
nut, the fixing is done by tightening of the nut over the projecting bolts after the
equipment is lifted into the position. A typical projecting type bolt is shown in Fig.
2.1.
2.6.
INSERTION OF THE BOLT
The Expansion Bolt is inserted into the hole completely, with the expander nut
leading in. A flat steal plate of 150mm x 150mm x 6mm is used to flatten the steel
ferrule prior to loading on the bolt. At the time of insertion care is taken that the
bolt is kept straight and perpendicular to the floor. Refer A in Fig. 2.2.
2.7.
TIGHTENING OF THE BOLT
The hexagonal nut is tightened along with a washer. This is done with a proper
spanner. During tightening the expander nut is drawn up the shield assembly on
account of complimentary tapers given, thus forcing the segments apart. During
tightening care is taken not to exceed the maximum tightening torque specified.
Refer B and C of Fig. 2.2.
After the nut is tightened to the fullest extent, the nut is removed from the bolt. The
flat plate used for flattening the steel ferrule is also removed.
The installation/erection of the basemount is done on the bolts thus grouted on the
floor. Refer D of Fig. 2.2.
20
C-DOT DSS MAX-XL
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