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Standard data for SITE Engineers
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GENERAL POINTS EVERY SITE ENGINEER MUST KNOW:-
- Lapping is not allowed
for the bars having diameters more than 36 mm.
- Chair spacing maximum
spacing is 1.00 m (or) 1 No per 1 Sq.m
- for dowels rod minimum
of 12 mm dia. should be used.
- Chairs minimum of 12 mm
dia. bars to be used.
- Longitudinal
reinforcement not less than 0.8% and more than 6% of gross C/S.
- Minimum bars for square
column is 4 No’s and 6 No’s for circular column.
- Main
bars in the slabs shall not be less than 8 mm (HYSD) or 10 mm (Plain bars)
and the distributors not less than 8 mm and not more than 1/8 of slab
thickness.
- Minimum thickness of
slab is 125 mm
- Dimension tolerance for
cubes + 2 mm
- Free fall of concrete is
allowed maximum to 1.50m.
- Lap
slices not be used for bar larger than 36 mm.
- Water absorption not
more than 15 %
- PH value of the water
should not be less than 6.
- Compressive strength of
Bricks is 3.5 N / mm2
- in steel reinforcement
binding wire required is 8 kg per MT
- In soil filling as per IS code 100 sq. m should take 3 sample for core cutting test
STRIPPING TIME (De-Shuttering) OF FORMWORK:-
For columns, walls, vertical
form works : 16-24 hrs
Soffit formwork to slabs : 3 days (props
to be refixed after removal)
Soffit to beams props : 7 days
props to refix after removal.
Spanning up to 4.50m : 7 days
Spanning over 4.50m : 14 days
Arches spanning up to 6m : 14 days
Arches spanning over 6m :
21 days
APPROXIMATE COST PER SQ.FT HIGH RISE BUILDING:-
Structure =
979 / SQ. ft.
(Concreting, Block work,
Plastering, Flooring, Dado, painting)
Electrical works (Modular
switches) = 172 / SQ. ft.
Plumbing (P.H.E) =
93 / SQ. ft.
Fire Fighting =
13 / SQ. ft.
Lift =
34 / SQ. ft.
Common Area =
94 / SQ. ft.
External development
(Landscape, road works, drains etc.,) =
87 / SQ. ft.
Calculation of Materials:-
a) For
1 m3 of concrete Mix 1:2:4 (M15)
Add 50% for wet concrete = 1.50 m3
= 1.50 / (1+2+4)=
0.214 m3
For
1 m3 = 28.8 bags of cement required (1440/50) say 29 bags
Cement =
0.214 x 29 = 6.206 bags
Sand =
0.214 x 2 = 0.428 m3
Aggregate =
0.214 x 4 = 0.856 m3
b) Wall
plastering in CM 1:4 of 12 mm thick for 100 m2:-
Volume = 100 x (12/1000) = 1.20 m3
Add 30 to 35%
as bulking of sand = 0.36 m3
Add 20 as
wastage of sand = 0.312 m3
Total =
1.872 m3 = (1.872 / (1+4)) =0.374 m3
Cement = 0.374 x 29 = 10.846 bags
Sand = 0.374 x 4 = 1.496 m3
c) For 100 m3 of solid Block masonry in CM 1:6
mix 8” thick:-
Volume = 100 x 0.2 (Thickness of wall) = 20 m3
No. of blocks
required = 20/ (0.4 x 0.2 x 0.2) = 12502 No’s
Volume of
mortar = 20-{0.39 x
0.19 x 0.19 x 1250}
=
20 – 17.598 = 2.40 m3
Note: 200mm –
10 mm for mortar thickness = 190 mm
Blocks =17.598/(0.4 x 0.2 x 0.2) =1100 No’s
Add 2% wastage = 22
Total = 1122 No’s
Increase by 25%
for dry mortar = 3 M3 = 3/ (1+6) = 0.429 M3
Cement =
0.429 x 30 = 12.50 bags
Sand ` = 0.429 x 6 = 2.57 M3
Blocks = 1122 No’s
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