NIT NO. 28 (2025-2026) EE(SDW)VI/Item No.11

Fabrication, supply, fixing, testing & commissioning of bar screen in the sewage incoming chambers No-1 & 2 at Sayyed Nangloi S.P.S having channel width- 2900 MM, Depth 8000 MM & length 3500 MM Appox each with L Shaped bar frame/screen. Job closing the incoming and outgoing gate also complete isolation of water entering in area necessary items such as gunny bags etc. of each bar screen during operation one by one.

Dewatering of sewage in isolated channel one by one for creating proper working space

Dismasting/ Removal of existing old worn-out MS bar screen in front existing channel of bar screen No. 1 & 2 & existing manual bar screen ( which is to be renovate), by cutting od damage MS structure with all support, Jaali, Guider and rusted nut bolts by gas cutter and required tools & tackles. Job also includes the charges of Hydra crane for taking out from the channel and keeps at ground as per direction of engineer-in-charge.

Making a temporary working platform by approximately 20 Ft long bamboos and manila rope etc inside the approx. 30 Ft deep channel at different height/ Location in the individual pit/ channel.

Removing/ stacking of the floating material from the screening chamber (approx. 30 Ft. Deep chamber) using heavy labour with the help of ladder. Hydraulic mobile crane and other necessary items.

Fabrication and fixing of SS-316 ‘C’ Channel of size 125 mm x 65 mm for making the guider in vertical possession of 11 mtr. Long approx. on both side walls in the sewage channel for up and down of bar screen. Welding of SS-316 plate of size 250 x 250 x 10 MM with ‘C’ channel duly drilled 4 Nos. Holes of 16 mm at every corner of plate and fixing with SS fastener bolts of 16 mm.

Providing & fixing of SS-316 I-section beam of 200 x100 mm up to 4 Mtr. Approx heights in vertical possession at ground with RCC civil foundation and tightening by SS stud grouted in RCC foundation. The work includes providing and welding of SS plate with 4 Nos holes of 20 mm drill.

Making of RCC civil foundation with grouting of S.S. stud for fixing of vertical SS I section beam also includes the cost of civil material with labour as per site requirement.

Fabrication & fixing of screen (Jali) of size 2.8 mtr X 3.5 mtr made out in L type shape made out fabricated of outer frame by S.S-316. Angle of size 75 x 75 x 6 mm and inner portion fabricated by S.S. flat of size 40 x 8 mm duly welded one by one at 20 mm gap in each flat and fixing in sewage channel by making of clamping system on upper side of bar screen of fixing with rope wire as per site requirement.

Fabrication & fixing of SS-316 platform of collecting the floating material removed from the sewage channel by bar screen. The size of platform is (2 mtr x 1 mtr). Made out of frame by SS angle (100 x100 x 6 mm), supporting SS angle (75 mm x 75 mm x 6 mm), SS-316 plate (2 mtr x 1mtr) and 6 mm thickness. Fixing with RCC foundation and tightening by SS stud grouted in the RCC foundation.

Providing and fixing of E.O.T crane of 3 ton (Single Girder) Capacity with 3 phase electric motor of suitable HP, flanged modulate TEFC type. This crane will be work for lifting of bar screen UP & Down. Job includes making electric connection fixing of panel box by main supply arrangement with suitable MCB box with cover & making safety arrangement from rain as per site requirement. The job also includes suitable size of cable its laying in ground & wall as required and connection ti main LT panel with all accessories etc make- Indef/Reva/WH Brady/ DJB approved.

Providing and fixing of SS-316 sheets at top level of water level so that the water could not pass by upper side of bar screen. The size of sheet will be 3 mtr x 3 mtr x 6mm duly welded with supporting SS-316 angle of size 65 x 65 x 6 mm and making proper strengthening for bearable of water flow pressure as per site requirement.

Fabrication & fixing of shed for safety purpose of complete system from the rain fabricated by SS-316 sheet of 3 mm thickness, SS-316 angle of size (50 mm x 6 mm) flat of size (75 mm x 6 mm), SS nut bolts and washer as per site requirement. Size of shed (3 mtr x 2.4Mtr).

Providing of SS nut bolts with washer of various size as required above

Fabrication & fixing of railing at platform for safety purpose of staff approx 3.5 mtrs x 4 mtrs area.

Polish of newly making SS bar screen complete system as per required.

Arrangement of all safety equipment’s for the protection of staff to work such as oxygen mask diving suit safety belts in the deep channel and at height making the working area free from all toxic gases and free from accident during working at site as per NHRC guidelines.

Testing & commissioning of bar-screen on full load and as per satisfaction of Engineer in charge.

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