Raw Material Inspection
The raw materials mainly P.C. Wire, cement, G.I. wire, Rodi & Bazari shall be purchased from a very standard manufacture having B.I.S. mark/ISO certification or any other quality approval certificate from other manufactures of cement poles/other such unit.
The test reports received with P.C. Wire & cement is examined on incoming of material by quality examine of unit, to insure that required Breaking load & other manufacturing details on physical verification like dimension of P.C. Wire is in order, material in not rusty & proper manufactured diameter & weight of coil as sample is checked in factory) port land cement & concrete mix strength is tested by cube test, cubes are made on regular basis as per the procedure given in specification.
Galvanized wire is checked physically for rusting, smooth finish, proper diameter & test certificate for Zinc used in galvanized wire is checked.
Water is also tested at initial stage, to ensure no stability & hardness, so that not to create rust in wires, works cube strength at 28 days at least 420 Kg/cm2 concrete strength traps is 210 Kg./cm2 mix contains 380 Kgs of cement/cubic meter of concrete.
Concrete Mixture Testing
This shall be done by cube test as per the procedure laid down in IS-1678-1978.
Manufacturing Process of PCC Poles
The steel moulds duly washed, shall be used for fixing P.C. Wires in moulds (16 wires in this case) each P.C. Wire is given proper tension to ensure that there is loosen P.C. Wire nor does it intermingle with other PC wires & GI Wire
The concrete prepared by mixing given ratio of cement, Bajari, Rodi & water in a concrete mixture machine, is such that it meets requirement of concrete mix necessary. & no extra water is added in the mix nor the concrete mixture is made in lager quantity, so as to ensure to use the same in given time by filling same in moulds having PC tensioned wires. While filling the concrete in moulds, they are given sufficient vibrations by shutter vibrators to ensure no gaps/wholes are left in casted poles.
Poles so casted are left in open for natural curing for 42/72 hours depending on day’s temperature. Poles are detensionized after obtaining proper strength, as per procedure given in IS 1678-1978 & removed from moulds, one by one by chain pulley blocks mounted on gentry crane. Poles are stacked with wooden Batta’s placed between each stacks, to ensure proper water curing poles are put in water tanks & submerged in it for 10-15 days & thereafter stacked in open.
During casting of Poles, each pole is marked as per requirement of purchase date month of casting, length of pole, marking serial no. & mark & tender no depending on which work order is made etc. It is ensured that marking is properly engraved in poles & words so marked are already visible.
Poles after proper curing & drying are tested as per IS-2905-1966 for proper size, shape, uprightness, and concrete cover, size of hole, G.I. wire projection & for working load as per load factor on testing bed on transverse face of poles. This ensures that proper ultimate load is taken by Pole.