ESTIMATING, COSTING, SPECIFICATION, AND
440
Example7. To form Embankment of a canal partly in excavation
VALUATI
and
ON
balance quantities of carth as required from borrow pit for every 100m distance partarely in
284cu m, 385 cu m, 107 cu mand 108 cu m. Find
the area of Temporary land
separately when the depth of excavation is limited to 30 cm. Find out required
also the
estimated
for embarkme
105 cu m, A6
everCosyt 0m di
of the temporary land @ Rs. 2.50per sq. m. for ire th
Quantity of Area of temp. land Quantity of
Distance earth from Quantity Distance earth from Area of emp. lan
borrow pit depth ofQuaexCavai
nity ca
in metre bomow pit epth of excavation in metre
CUm sq m CUm
0to 100 105 350.0 400 to 500 107
100to 200 246 820.0 500 to 600 2 356.7
200 to 300 284 946.7 600to 700 108
6.7
300 to 400 385 1283.3
360.0
Total = 3400.0 sq m
Total =7234 sq m
Grand total area = 3400.0 + 723.4 = 4123.40 sqm
Cost of hire charge for temporary land requircd @Rs. 2.50 per sq m=Rs. 10.308 50
Exampie &-Earthen Dam: The cross-section of an earthen dam ata certain change in its longitudinal ger
is shown in Fig. 11-6. The hearting of the embankment is specified as selected fine clay, and that for the co
as murum. A 500 mm thick dry rubble pitching is to be provided on the up-stream face of the dam. The ortu
slopes upwards unifornly at the rate of lin 20 in the direction parallel to the cen°re line of the dam. The :
siope at the site may be assumed as level.
Determine the quantitiesof materials required for the hearting, casing and pitching for alengh
80 metres of the dam from the given section and prepare an estimate of the materials for this portion au lc
rates.
5 m. A.MIE. 1988
M.W. L t58-50 R.L. t59- 50 R.L.t60-00 +
-50Gm
m . .
RLt59-00
3m,
2:1
2:1
CASING HEARTING CASING
R.L.t45-00
R.LT+44-00 CUT- OFF TRENCH
R.L. +40-00
NOT TO SCA
CROSS SEC TION
M
ESTIMATTING, COSTING,
SPECIFICATION AND VALUATION 441
excludingcul-offirench first (quantity by prismoidal Formula.
rhuton.
, dam at 0
othe
dist. = 59.00 45.00 =14,00 m,
Hight
40m dist. when the
9 the dam at ground
slopes upwards @l in 20 =14.00
of the dam at 80 dist. 14.00- x80 = 10.00 m
m = -x 40 =12.00 m
Height
) Top width, B= 3 m. Side slope S:1=:1
Sctionarcaat 0. dist. A, = Bd +sd²= 3x 14 + 0.5 x14= 140 sq. m.
Seclionarea at40 dist. A,n =3 x 12 + 0.5 x122= 108 sq m.
+( x 10 =80 sq. m.
A,, =3 x 10 -0.5
Seciionarca at 80 dist.
niy of Hearting = (A,+ 4A,o +As =80 (140+4x108 +80) =17,38667 cu m
cut-offtrench =(3 x 5) x 80 = 1200 cu m
(Quantityfor
1) Total quantity for Hearting = 17,386.67 + 1200 =18,586.67 cu m.
Quantiyfor casing =Total vol. of Dam (excluding trench) - vol. of Hearting.
Hicht of dam a 0 dist. = 60.00 - 45.00 = 15.00 m
Hoicht of damat 40 dist. = with upward ground slope 1:20 = 15.00 -x 40 = 13.00 m
Heicht of dam80m dist. =with upwardground slope 1:20= 15.00-x80= 1.00m
Top widh B= 5m; Side slope S:l = 2:1
Section area at 0 dist. A, = Bd + sd² = 5x 15 +2 x 15 = 525 sq m.
Section arca at 40 mdist. A, = 5x 13 +2 x 13 = 403 sq m
Section area at 80 m dist. A,,30 = 5 x 11 +2 x 11' = 297 sq m.
loal vol. of Dam (excluding trench) = 0 (525 + 4 x 403 + 297) = 64,906.67 cu m.
3
2)Quantity for casing =64,906.67 17,386.67 =47,520.00 cu m.
Area of 50 mn thick piiching one side =Lxd Vi+s?
Where, L =80 m, d = (1S+11) =13m; S=2
Area of pitching above G. L, =80 x13 V1+22 =2,325.51 sq m.
Area of pitching in G. L. =80 x(54.00 -44.00) =80 sq m.
Total area of 50 mm thick pitching = 2,325.51 + 80 = 2,405.51 sq m.
. 3)
Quantity of dry rubble = 2,405.51 x 0.5 = 1,202.76 cu m.
Required Quantities and estimated cost of the materials : - Amount
1.|
Descripion of materials Quantity Rate
1,46,453.36
Material for Hearting (dry clay) 18,586.67 cu m. @ Rs. 8.00 per cu m =
2|NMaerials for Casing (murum)
3. Dry nubble 47,520.00cu m.
1,202 67 cu m.
@ Rs. 10.00 per cu m=
@ Rs. 30.00 per cu m =
4,75,200.00
36,080.10
Total estimated cost = 6,57,733.46
Say = Rs. 6,57,734.00
