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.

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 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 50m 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

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: 1:3:6 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

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= 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

THANK YOU THE END