Es_ug Tanks Design

CIRCULAR TANK SIZE OF TANK

6000

DIA 1.8

LIT CAP.

TYPE OF CONSTRUCTION

X

1

BELOW GROUND LEVEL WATER TABLE 1.5 M BELOW GROUND LEVEL ABOVE GROUND LEVEL

2 WALL THICKNESS BASE SLAB THICKNESS

75 MM 90 TO 75 MM

COVER SLAB THK FOR UG TANK FOR ABOVE GROUND TANK

HEIGHT 2.70

IN SLOPE FOR DRAINAGE

115 MM 75 MM

GRADE OF CONCRETE

M 40

WITH 12 MM SIZE WELL GRADED COARSE AGGREGATE 25 X 25 X 10G WELD MESH IN THE CENTER OF WALL/SLAB

REINFORCEMENT

600X600 MH COVER TO BE PROVIDED IN COVER SLAB DESIGN

AS PER IS:3370

SURCHARGE CONSIDERED CONSIDERED FOR UG TANK

1 MT / SQ.M

NOZZLE DETAILS INLET PIPE OVERFLOW PIPE OUTLET PIPE DRAIN PIPE

100 150 100 AT

CIRCULAR WATER TANK

LIT

wall thickness

MM BELOW BOTTOM OF COVER SLAB MM BELOW BOTTOM OF COVER SLAB MM ABOVE TOP OF BASE SLAB TOP OF BASE SLAB

DIA

HT

=

2

H /DT

75

mm

=

270^2 / ( 18 180 x 7.5 )

=

54

DUE TO INSIDE WATER PRESSURE pressure at bottom

=

cantilever moment with 1.0m cantilever action

=

pressure at H/3 from top

=

hoop tension

=

1.8 x 1.8 / 2

=

1.62 t

TANK UNDER GROUND

TOP

2.7 t/sq.m 0.45 t/m 1.8 t/sq.m

0.3 M AB A BOVE GROUND

MM

WATE TABLE

1 M BELOW GL #DIV/0! 0.000

0 0

1

0.000

0.8 0

1.5

0.000

2.70

0.9

0.000

0.6 0 BM #DIV/0! 0

0.000 1.20 0.912 2.7 INSIDE PRESSURE

1.62 2.532

0.000

0.4 0.2

0 0

0.3 OUTSIDE PRESSURE

0 #DIV/0!

DUE TO OUTSIDE PRESSURE due to soil pressure surcharge SURCHARGE UDL PRESSURE DUE TO SUBMERGED EARTH

= = =

1 T/SQ.M 0.3 T/SQ.M 2.53 T/SQ.M

VERTICAL BM DUE TO OUTSIDE PRESSURE

=

( 2.532 + 0.3 ) X 1/2 X 1/3

= HOOP COMPRESSION

0.47

=

( 0.9 + 0.3 ) X 1.8 / 2

= WITH 75 THK. WALL BENDING STRESS

=

TENSILE STRESS DUE TO HOOP TENSION

=

1.080

T

5.03 KG/CM^2 1620 / ( 100 X 7.5 )

= ALLOWABLE TENSILE STRESS

T.M

2.16 KG/CM^2

=

24 FROM TABLE 1 IS3370-PART-II >

5.03

VOLUME Base slab wall

1 1

1.53 5.89

0.075

0.075 2.70

0.11 1.19 1.31 cu.m

BASE SLAB PROJECTION BEYOND WALL

=

0.1 MM

WT OF SOIL IN THE PROJECTION UPLIFT

= =

3.13 4.42 MT

FACTOR OF SAFTY AGAINST UPLIFT

=

1.45 >

1.2

3.27 MT