8 Meter PSC/PCC Pole
Physical specification
The poles would be made along the minor of 8 meters, 200 kg workload from the top, and 2nd hole at 200mm from the top.
Along the minor axis, five holes. The 1st hole is 75mm from the top, followed by the 2nd at 375mm from the top. The 3rd hole is 675mm from the top. The 4th hole is 975mm from the top, and the 5th hole is 1275mm from the top, on both sides of the poles.
The pole shall be rectangular in cross-section. The top section shall be 145mm X 90mm, and the bottom section 290mm X 90mm, with a total length of 8 meters and an overall weight of 360 kgs.
Each pole shall have an 18mm diameter through holes suitable for a 16mm disc bolt at the following distance from the top along the minor axis in case poles are used on L.T lines. Each bar shall have pre-stressing steel wire of 4mm diameter with a guaranteed ultimate strength of 175 kgs/mm2, nos. as tensioned wire, and two numbers with pre-stressed cables.
Each Pole Shall Be Embossed Or Engraved With
Month and year of manufacture
Maker name, serial number, and making symbol
Transverse strength of pole in kg
Each pole shall have earthing 8 SWG wire embedded in concrete during manufacturing so that the end of the wire is left projecting from the bar to a length of 50mm at 250mm from the top and 150mm below ground level. i.e., 1350mm from the bottom end. The earthing wire provided will not be allowed to come in contact with pre-stressing cables, as per customers’ specifications. Further each pole shall be equipped with M.S stirrups as per ISS 432/1966 with anneals wire of ultimate strength of 32 kg/mm square and 4 mm M.S wire ten in numbers spread throughout the length at suitable spacing. Permissible tolerance in plighting shall fully confirm the relevant provision of ISS: 1342/1980 and ISS: 1678/1978 and the latest publications.
Technical Specification
PSC poles shall comply with the recommendation of REC as per the specification 15/1979 (with the latest amendment) except where there are conflicts regarding specific requirements.
The ISS specifications complied with are:
ISS:1678/1978
ISS:2985/1966
ISS:7321/1974
The pre-stressing steel wire, including those used as intentioned wire, shall confirm to IS: 1785(part-1)/1966, ISS: 1785(part 2)/1967, or 6003/1970 in case of indented wire. The wire shall be 4 mm in diameter with a guaranteed ultimate strength of 175kg/mm square. The concrete mixture shall be according to the requirement for controlled concrete in ISS: 1343/1980 and ISS: 456/1973. The cubes’ strengths at 20 days shall not exceed 420 kg/mm2. The maximum compressive stress in concrete at the time of transfer of pre-stressed shall not exceed 0.8 times. The cube and concrete strength at transfer shall be at least half the 28 days strength, i.e., 420 X 0.5 = 210 kgs/mm2. The concrete shall be mechanically compacted by shuttering vibrators. Poles shall have the safety factor 1.0 against the first crack load and not less than 2.3 against failure for loads applied at 0.06 meters from the top with 1.6 meters of pole inside the ground. The guaranteed minimum ultimate transverse load shall not be less than 500 kgs. The maximum moment capacity in the longitudinal direction should be at least one-fourth of that in the transverse direction.
