Indian National Committee on Large Dams. Design and Construction Features of Selected Dams in India
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BHAKRA
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INSTRUMENTS
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39
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BHAKRA
T}Ail
INSTRUMENTS
TRAVERSE
MARKERS
ON
TOP
OF
DArrl
l-ocATloll
I
DgrAlLs
F
t GURE
40
I
L
i
Iocations
in v31iou.s
galleries
in
the
dam,
for
taking
observations
of the
inst-ruments
on
standard
wheatstone
bridge
circuit
test
sets.
- _
(5)
Plumb
Lines:
For
observing
the dam
deflection
254
mm (10
in.)
diameter
prumblin.
*"irt
trun"
been
provided
in
blocks 15,
20
and
25
installation
of
plumb
lines (pendulums).
Plumb
line
in block
20 is
the
longest,
having
susp_ension point.in-
ga,llery
El.
490.12
m
(I,OSO
ft)
l4!l-
and
ptumb
bob in
galtery
El.
336.80
m
it,tOS
ft)
MSL,
ln
blocks 15
and
25-
plumb
linesaie'intwo
suspension
point
in
gallery
-
and
plumb
bob
in
gallery
:SL
in
each
of
these
two
n
has
suspension
in
gallery
L
in
borh
blocks
t5
and
25
ylrjl..pl-umb
!o-b
is-
in
gaJlery
El.
3;gl.Sg
m
(1,288
fr)
MSL
in
block
l5
and
in
gallery
EI.
39g.69
m
(t,SOS
fti
MSL
in
block
25. The
lowlr
portion
is somewhat
staggered_
downstream
with
respect
to
the
upper
portions
in
both
of
these
blocks.
observation
recesses
have
been
provided
at
various
gallery
locations
for observation
of
plumb
line
move-
penJ
by
means
of
micrometer
slide
and
microscope.
Each
of
the
observation
recess
has
been
provided
with
airtight
steel
door
to
prevent
the
draft
and'
disturbance
to
the-
phrmb
line
when
observations
are
being made
at
any
observation
recess.
Deflectors
have
been
provided
in
the
gailery
)r.r.-
in
the dashpot
has
been
placed,
to
pr&ent-moisture
condensation
from,
falling
into
the
dashpot
oil
and
disturbing
the
plumb
line.
,
(6)
Utlrft
Pressure
lipes:
A
toral
of 50
uplift
9ps9rya1i^on
poin_ts
hqve
been
provided
in
blocks
gl
tZ,
15,
18,20,22,25
and
28 for-measurement
of
upliftai
the
base
of
the
dam.
These
pipes
terminate
into
the
various
foundation
galleries
a^na
each
of
these
has a
permanently
-
mounted
Bourdon
type pressure
gauge
for observation
.of
uplift pipes.
-Locition
of
"upli'ft
pipe:
in
any
block
has
been-a6cording
to the
foilowiirg
requlrements
:
(i)
One
pipe
ar the
dam
a>ris.
(ff)
One
pipe
at the
centre
line
foundations
gallery
Iocation.
(iif)
one
pipe
each
on
either
side
of
a treated
weak
zone.
(iv)
The
remaining
ones generally
at
30.4g
m
(100
ft)
spacing.
In
b'locks
*t
i"f,
truu.
no
foundation
transverse
gallery
upiin
p,p.,
have
been
extended
to
the
irain
founoutioi
lailery
by
means
of
horizontal
extensions
termi"nating
in
the
main
foundation
gallery.
73
----/
_W.F,
Sprenegnether
lnstruments
Co..
U.S.A.
(l)
Natural
period
of
.
15
sec.
Seismometer
(2)
'Natural
.
period
of
100
sec.
Galvano-
meter
Magnification
1,500
Damping
Critical
ln
the
dam
eallery
at,EI.
330.I
m
(1,0g3
f0
MSL
a
ser
of
wood
aiders6n
stir;;;;"ptr
nal
uiroiorturt.o,
details
of
which
are
as
under
:
Make
Constants
:
(i)
Accelorograph
Model
Make
on
stants
:
(iz)
Seismographs
Model
Make
Constants
:
(fif)
Sprenegnether
vertical
I
Unit
AR
240
U.E.D.
Earth Science
Division
Tele-dyne
Sys-
tems
Company,
Canf6r-
nia,
U.S.A.
Sensitivity
-7
.62
crn
per
g
(adjustable)
Natural
frequency-18
c-p-s.
Damping-0.60
1
set
H.E.S.
Hagiwara
Electr-
omagnetic
Seismograph
(3
Units)
Akashi
Seisakusho
Ltd.,
Tokyo,
Japan.
(1)
Natural period
of
1.0
sec.
Seismometer
(2)
Natural
period
of
1.0 sec.
Galviino-
meter
Magnification
5,500
Damping
Critical
Unit
Seismographs
Make
Constants
:
Tiltmeter
Model
Make
Constants
:
Natural
period
Magnification
Damping
Magnification
Damping
2
sec.
1,000
Critical
The
data
oQtained
from
seismographs
would
provide
information
about
the
earthqilake
ihocks
in
the
dam
and
response
of
the
structur;,
in
addition
to
the measurement
of
the
magnitude
.f'or-,idration
resulting
from
outlets
and
spillway
operatil;
'-
-
(11)
liltmeters
:
Two
tiltmeters
have
also
been
located
in
the
d1F,
,one
in
the
recess
adjaceni
to the
tjggslgrtg
eallerf
block
20
sta.
t3+27.5
""0
"iainug"
14+74.50
and
otb.er
in
Er.
490.12
m
ri,oos
it)
MSL
inspection gallery
block
zo.
Details'.i-in.iiitmeter
are as
under
:
2
Units (one
in
each
eallerv)
installed
perpendicular-to
axii
of
the
dam-
Milneshaw
Seismograph
Hilger
and
Wats
Ltd.,
London,
modified
by
I.M.D.
Natural
period
25
sec.
Sensitivity
tilt
go-g':Ql,,
of
earth
pro-
3F:'i'sJJ'u
250 sec.
2O:- |
74
NAGAryUI\ASAGAR
DAM
by
J.S.R. MOHAN
RAO
,
Superintending Engineer
Design and O,uality
Control
'
Nagarjunasagar
Proiect,
Hill
Colony
(A.P.)
\
-q-r"J
'+