Military Engineer Services Tender

M&L for excavating in bore holes of 300 mm (minimum) dia to a depth of 3450 mm (minimum) by augur or any other process trenches manually not exceeding 0.5 cum in each bore complete incl removing surplus excavating material, returning filling for chemical earthing in soft / loose soil all as specified and directed.

Supply, install, testing & commissioning of maintenance free chemical earthing by pure Copper Electrode of 17.2mm dia and 3000mm long for earthing with excellent electrical conductivity and corrosion resistance, minimum 50 kg ground enhancing compound/ material used around the electrode inside the earth pit to define the working environment of the earthing system complete all as specified and directed. Make : Electrode - 99.9% pure copper rod with test certificate for purity from any Government lab, Ground Enhancing Compound-ABB/ OBO The process for the earthing are appended below:-

i) Soil resistivity of that area shall be measured. ii) If soil resistivity is more, then multiple earthing shall be carried out in grid pattern i.e if two earthing is reqd then the pattern is" ── " and if three earthing is reqd the the pattern is "∆", but a minimum distance of 2 meters between two earth pit should be maintained. However, there should not be more than three earthing pit in a grid. iii) Make a bore of 300 mm (minimum) dia to a depth of 3450 mm (minimum) by augur or any other process. iv) The soil dug out from the earth pit shall be checked to remove lumps and stones from it, before back filling. v) Moisture retaining ground enhancing materials of minimum 50 kg having resistivity equal to or less than 0.3 Ωm shall be poured in the bore. vi) A layer of 150mm of the above ground enhancing materials shall be prepared at the bottom. vii) Plastic sleeves from electrode shall be removed before it is lowered in the pit. viii) Small quantity of ground enhancing material shall be filled at a time and some water in the pit. Further quantity shall be added after the earlier quantity has been sufficiently poked with suitable rod to remove trapped air bubbles from it. ix) If grid earthing is reqd. necessary interconnection shall be carried out by 20X3mm copper strip which shall be buried below 300mm from G.L with additional quantity of ground enhancing material & cost of the same is deemed to be included in this rate x) The above arrangements shall be provided with Heavy duty earth champer of 5000kg load bearing capacity to ensure the safety of earthing system OBO Type No.UFE (5450 03 0) Make :OBO Bettermann/ABB . xi) A coat of conductive petroleum jelly shall be applied on the terminal of the electrode & copper alloy clamp for protection against corrosion. xii) A certificate from the Government lab for purity of the electrode and resistivity of ground enhancing compound /material shall be furnished prior approval of sample.