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BRUEL & KJAER 4812 - 2.2. Electrical Installation of Exciters Using Type 4801 Body

BRUEL & KJAER 4812
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272
182
Fig.2.
1.
Typical
seismic
block
system
A
sketch
of
a
typical
seismic
block
system
is
shown
in
Fig.2.1.
The
block
either
stands
above
the
lab
floor
or
is
mounted
in
a
pit.
In
the
example
shown,
the
springs
are
in
compression.
In
another
type
of
mounting,
each
corner
of
the
block is
hung
from
a
matched
pair
of
springs
in
tension
(Fig.2.2).
Note
that
in
either
case
the
coupling
of
mass
to
springs
is
done
in
the
plane
of
the
cen-
ter
of
gravity
.
The
mounting
bolts
for
the
exciter
trunnion
can
be
set
into
the
concrete
during
pouring,
but
a
better
matching
of
bolt-holes
is
achieved
if
the
bolts
are
welded
to
a
plate
and
the
plate
anchored
to
the
concrete.
This
can be
done
as
shown
In
Fig.2.3.
The
bolt
is
pushed
through
the
location
hole
in
the
plate
from
underneath
and
the
head is
welded
to
the
plate.
J-bars
of
suitable
dimension
can be
welded
on,
to
anchor
the
plate
8
2

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