Page 102 - Machinery Component Maintenance

Machinery Foundations and Grouting 85

the physical properties reported in their technical literature. Remember,
the physical properties of epoxy grouts, unlike cement-based grouts, are
reduced drastically with rising temperatures. Because of the lack of good
data and experience, this method of installation should be classed as ex-
perimental and utilized only at the equipment owner’s risk.

Anchor Bolts

The stretching of an anchor bolt between the bottom of the sleeve and
the bottom of the nut (Figure 3-4) is desirable to create a spring effect
that will absorb impact without fatiguing when the bolt is tightened to
proper torque. Isolating the bolt from the epoxy grout prevents bonding
that can cause temporary stretching over a short section, resulting in
loose bolts soon after start-up as the bond fatigues. Isolating the bolts
also prevents short radius flexing of the bolt if lateral movement devel-
ops. Anchor bolts are designed for hold-down purposes and not as pins to
restrict lateral m~vement.~

Foam insulation- grout

Stretching
Pliable fill length
(silicone rubber)
in anchor bolt
sleeve

Figure 3-4. A typical anchor bolt installation which allows freedom for equipment growth
from thermal expansion.