AHMEDABAD DIVISION TENDER DOCUMENT ... - Western Railway

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[Downloaded from Internet] (I) Technical specification for item No. 11 of SCHEDULE of rates and quantities : [Digging of trench] Cable shall be laid in trench between poles, main boards as per instruction of site supervisor. The cable in trench shall be laid as per drawing no. Sr. DEE/ADI-51/2234 and IS 1255 (Latest). The installation of cable including joints shall be carried out in accordance with code of practice as specified in relevant ISS as amended latest. Route of the cable. Before laying is under taken the route shall be marked in consultation with Railway's representative at site. While selecting cable route, corrosive soil, ground surrounding sewage effluent etc. shall be avoided. Cable lay out drawing to be got approved from work executing officer i.e. ADEE / P/ ADI before executing the work. Trenching: The width and depth of excavation shall be done as per drawing, for underground cables adequate protection shall be taken not to damage any existing cable (s), pipes or other such installations coming in the proposed route during excavation. Where brick, tiles or protective covers or bare cables are encountered, further excavation shall not be carried out with out consultation and approval of the Railway’s representative at site. Existing Railway property exposed during trenching shall be temporarily supported or propped adequately as directed by Railway representative i.e. site supervisor. The trenching in such cases shall be done in short length necessary pipes laid for passing cables there in and the trench refilled in accordance with clause No. 5.1. If there is any danger of trench collapsing or endangering adjacent structure, the sides should be well shored with timbering and or sheeting/as the excavation proceeds. The bottom of the trench shall be leveled and free from stone, bricks bats etc. The trench shall then be provided with a layer of clean dry sand cushion of 10 cm as shown in drawing. Provision of bricks is to be made for cable laying as shown in drawing. Approx 16 No bricks are required for the single cable trench and 28 bricks are required for the Double cable trench for the length of one meter distance. The site of trench will be given as per requirement by supervisor in charge of work. Laying of cables in trench: All cables before laying shall be tested with megger. The cable cores shall be tested for continuity, absence of cross phasing, insulation resistance between conductors to earth/sheath/armoured and insulation resistance between conductors. At the time of installation approximately 3 meters. of surplus cable shall be left on each end of the cable and at places as may be decided by the Railway. The surplus cable shall be left in the form of a loop. Back fillings: The trenches shall be back filled with excavated earth free from stones or other sharp edged debris and shall be rammed and watered. Unless otherwise specified a crown of earth should not be less than 50 mm in the center and tapering towards the sides of the trench filling as may be required. Cable route markers: [ Tenderer ] [ Page 42of 44 ] [For Sr.DEE/ADI ]
[Downloaded from Internet] Cable route markers shall be provided along straight runs of the cables at the locations approved by Railway. Route markers shall be made out as per sketch with information as size, cores and grade of cable shall be displayed. Cable route indicators with IR engraved on it to be provided at every 50 meters. Jointing: Before jointing is commenced all safety precautions like isolation, discharging, earthing etc. shall be taken to ensure that the cable would not be in-advertantly charged from live supply. Metallic armour and external metallic bonding shall be connected to earth. Where cable is to be jointed with the existing cable the sequence should be so arranged, as to avoid crossing of cores while jointing. Note: For item no. 6 of SCHEDULE, digging and laying of cable to be done in garden area where trench should be taken 1 feet deep and filling back without bricks. Contractor shall have to repair plaster or bricks work if damaged (J) Technical specification for item No. 12 of SCHEDULE of rates and quantities: [Laying of cable in Air, Wall, Pipe etc] Cable shall be laid between poles and main boards. These cables are to be laid on wall / Pole / Air with suitable of clamps. Route of the cable. Before laying is under taken the route shall be marked in consultation with Railway's representative at site. Jointing: Before jointing is commenced all safety precautions like isolation, discharging, earthing etc. shall be taken to ensure that the cable would not be in-advertantly charged from live supply. Where cable is to be jointed with the existing cable the sequence should be so arranged, as to avoid crossing of cores while jointing. The installation of cable including joints shall be carried out in accordance with code of practice as specified in relevant ISS as amended latest. (K) Technical specification for item no.13 of SCHEDULE of rate and quantities : [ Laying of cable in RCC area] The Contractor shall have to do laying of the existing cables in trench in the size of 300mmx200 mm and laying of existing cable in same trench & resurfacing as earlier. The Digging of the trench should be carried out by excavation method in PCC/Road/Platform area. Contractor shall have to made trench by excavation method in pukka (PCC/Road/Platform) area. Digging of trench and it’s covering with PCC to be done by contractor. Filling of this trench shall be done with PCC having ratio of cement concrete and sand as per 1:2:4 ratio. Work shall be carrying out as per instruction of site in charge. ----------------------------- [ Tenderer ] [ Page 43of 44 ] [For Sr.DEE/ADI ]
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AHMEDABAD DIVISION TENDER DOCUMENT ... - Western Railway

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