Foundation:
Foundation is required to support structure for transmission tower, lighting poles, and transformer erection etc in the field of electrical engineering.
For foundation of single wooden, concrete or steel pole, the pit is excavated to a required depth. Precast concrete poles or steel poles are inserted in the pit. Concrete mixture is poured layer by layer and is rammed every time. Mixture ratio is normally 1:2:4 of cement: san: stone.
Depth for foundation is generally 1/6 Th of the length of pole.
Typical depth of foundation pits are as follows:
Pole size (meter): 9 10 12 15 18
Depth of foundation: 1.5 1.7 1.8 1.8 2
Location of poles:
Poles are located at least 1.5meter away from fire hydrant, underground cable trench, and 5meter away from road boarder and railway
Height of the pole in distribution system-
10M, 12M, 14M
Span of the pole:
Rural areas : 50 to 60m
Foundation for 9 meter street pole
a) Lean concrete ratio-1:3:6 (cement: sand: stone)
Volume: 0.7X 0.7X0.15 = 0.0735M3
Cement required per M3= 220kg
Cement for above volume= 16.17 kg b) Pedestal PCC at ratio 1:2:4
Outer dia =0.540M
Inner dia= 0.15M
Height = 1.5M
Volume = π/4 x (D2-d2) x H
= π/4 x (0.542-0.142) x 1.5
= 0.321M3
Cement required for ratio 1:2:4 @ =320kg per M3
For 0.321 M3 volume cement required = 320 x 0.312 = 102.72kg
c) Copping ratio 1:2:4
Outer dia =0.30M
Inner dia= 0.14M
Height = 0.3M
Volume = 0.021M3- 0.004M3)
= 0.017M3
Total cement consumption per pole =a+b+c = 16.17 +102.72+ 5.44 = 124.33kg
Plaster 1:4 cement =5.47kg/M3
Brick masonry 2x0.6x0.45x0.115=0.062M3
2x0.3x0.45x0.115=0.031M3
-------------
0.093M3
Cement consumption: 0.093x95=8.835kgs
Plaster 4x0.3x0.45 = 0.54M3
4x0.6x0.1 = 0.24M3
2x0.3x0.15 = 0.09M3
------------
1.05x5.47 = 5.749kg
Total cement consumption
For one earth pit chamber = 14.58kg
FOUNDATION OF FEEDER PILLAR & TELEPHONE DB Cement 0.11x 220kg/M3
2. Brick work = 2x1.0x0.5x0.075= 0.075M3
2x0.5 x0.35x0.6= 0.21M3
0.9 x0.5x0.3 = 0.135
-------------------------------------------------
Total =0.42M3
Cement = 0.42x95kg/M3 (1:4 mortar)
=39.9 kg
3. Plaster 12 mm thick
0.9 x0.3x2 = 0.54M2
Total = 0.84M2
Cement: =0.84x547kg/100M2
=4.6kg
4. Neat coat =1.7kg@1.9kg/M2 for area of 0.84M2
Total cement for one foundation = 70kg
a) Lean concrete ratio-1:3:6 (cement: sand: stone)
Volume: 0.7X 0.7X0.15 = 0.0735M3
Cement required per M3= 220kg
Cement for above volume= 16.17 kg
b) Pedestal PCC at ratio 1:2:4
0.5x0.5x0.1 = 0.25M3x320 =80kg
Height = 1.5M
Cement required for ratio 1:2:4 @ =320kg per M3
c) Copping ratio 1:2:4
0.3x0.3x0.045x320=14.40kg
Total cement consumption per pole
=a+b+c = 16.17 +80+ 14.4 = 110.57kg
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ReplyDeleteWe need advise for this problem. This is for fencing our Agri land. we have to fence about 270 poles including border ones - we have decided to keep 10 feet distance between poles. So perimeter is 2700 feet. Each Pole is 9 feet length, 6 in * 6 in square. We will dig 3 feet with Earth Auger and the circular Dug hole will be 12 inches ( 30cm) dia. Each hole and erect 3 feet inside and 6 feet above ground.
ReplyDeleteOur question is " Do we need to use concrete for pouring into the ground? for strengthening (or) can we have stones and loose soil to close the space between Earth and the Pole which is 3 feet.
Please reply.
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