FOUNDATION ELECTRIC POLES

PRESENTATION

Pole Foundation:-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.

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

Depth for foundation is generally 1/6 Th of the length of pole.

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:Residential area: 30 to 50mRural 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 1:2:4Outer dia =0.540MInner dia= 0.15MHeight = 1.5MVolume = 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

Earth pit chamber: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    

1. Lean concrete: 1:3:6Cement 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 kg3. Plaster 12 mm thick0.9 x0.3x2 = 0.54M2    Total  = 0.84M2Cement: =0.84x547kg/100M2                =4.6kg4. Neat coat =1.7kg@1.9kg/M2 for area of 0.84M2Total cement for one foundation = 70kg

Foundation of post top fixture

a)      Lean concrete ratio-1:3:6 (cement: sand: stone)Volume:  0.7X 0.7X0.15 = 0.0735M3

Cement required per M3= 220kgCement for above volume= 16.17 kg

b)      Pedestal PCC at ratio 1:2:40.5x0.5x0.1 = 0.25M3x320 =80kgHeight = 1.5MCement 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

THANK YOU THE END