47/EEC/BSNL/CD/BGL/2025-26

Excavating trenches of required width for pipes, cables, etc including excavation for sockets, and dressing of sides, ramming of bottoms, depth up to 1.5 m, including getting out the excavated soil, and then returning the soil as required, in layers not exceeding 20 cm in depth, including consolidating each deposited layer by ramming, watering, etc. and disposing of surplus excavated soil as directed, within a lead of 50 m :

All kinds of soil

Pipes, cables etc. exceeding 80 mm dia. but not exceeding 300 mm dia

Making connection of drain or sewer line with existing manhole including breaking into and making good the walls, floors with cement concrete 1:2:4 mix (1 cement : 2 coarse sand : 4 graded stone aggregate 20 mm nominal size) cement plastered on both sides with cement mortar 1:3 (1 cement : 3 coarse sand) finished with a floating coat of neat cement and making necessary channels for the drain etc. complete :

For pipes 100 to 250 mm diameter

Providing and laying under ground low density foamed cellular wall PVC pipes and couplers conforming to IS:16098 (PART-1) including fixing pipe ends with solvent based cement adhesive in proper alignment complete as directed. (Note: The joint shall be tested for leakage before covering with infill material over the pipes)

160mm diameter PVC pipe of SN4 class, self fit type

Constructing brick masonry chamber for underground C.I. inspection chamber and bends with bricks in cement mortar 1:4 (1 cement : 4 coarse sand) C.I. cover with frame (light duty) 455x610 mm internal dimensions, total weight of cover with frame to be not less than 38 kg (weight of cover 23 kg and weight of frame 15 kg), R.C.C. top slab with 1:1.5:3 mix (1 cement : 1.5 fine sand : 3 graded stone aggregate 20 mm nominal size), foundation concrete 1:5:10 (1 cement : 5 fine sand : 10 graded stone aggregate 40 mm nominal size), inside plastering 12 mm thick with cement mortar 1:3 (1 cement : 3 coarse sand), finished smooth with a floating coat of neat cement on walls and bed concrete etc. complete as per standard design:

Inside dimensions 455x610 mm and 45 cm deep for single pipe line :

With common burnt clay F.P.S. (non modular) bricks of class designation 7.5

Constructing brick masonry chamber for underground C.I. inspection chamber and bends with bricks in cement mortar 1:4 (1 cement : 4 coarse sand) C.I. cover with frame (light duty) 455x610 mm internal dimensions, total weight of cover with frame to be not less than 38 kg (weight of cover 23 kg and weight of frame 15 kg), R.C.C. top slab with 1:1.5:3 mix (1 cement : 1.5 fine sand : 3 graded stone aggregate 20 mm nominal size), foundation concrete 1:5:10 (1 cement : 5 fine sand : 10 graded stone aggregate 40 mm nominal size), inside plastering 12 mm thick with cement mortar 1:3 (1 cement : 3 coarse sand), finished smooth with a floating coat of neat cement on walls and bed concrete etc. complete as per standard design:

Inside dimensions 455x610 mm and 45 cm deep for single pipe line :

With common burnt clay F.P.S. (non modular) bricks of class designation 7.5

Extra for depth beyond 45 cm of brick masonry chamber :

For 455x610 mm size

With common burnt clay F.P.S. (non modular) bricks of class designation 7.5

Mechanical Clearing of blockages in Manholes and in connected sewer lines between over flowing blocked manholes of all sizes and depth including desilting removal of sludge/ silt/rubbish etc., should be transported to outskirts to a place permitted by local muncipality, etc. all complete as directed by the Engineer-in-charge.(Note:-T&P for the work shall be arranged by the agency).

Cleaning of choked WC pan /gully trap/nahni trap at all levels including rodding of vertical sewerage pipes, with G.I.wire of suitable thickness in blocked SWR pipes upto required length and removing all rubbish/sludge should be transported to outskirts to a place permitted by local muncipality, etc. complete in all respects and re-fixing and pointing the grating of floor trap with necessary white cement mixed with suitable pigment complete as per the direction of Engineer-in-charge. (Note:-T&P for the work shall be arranged by the agency).

Removal of blockage & Cleaning

Floor Trap/Nahni Trap/Gully trap

Cleaning of chocked sewer line by diesel running vehicle mounting hydraulic operated high pressure suction cum jetting sewer cleaning machine fitted with pump having 4000 litres suction capacity and 6000 litres water jetting tank capacity including skilled operator, supervising engineer etc. for cleaning and partial de-silting of manholes and de-chocking of sewer lines. De-chocking and flushing of sewer line from one manhole to another by high pressure jetting system of 2200 PSI for sewer line from 150mm dia upto 300mm dia for all depth.

Providing and fixing Rigid PVC (SWR)moulded fitings /accessories( for working pressure 4kg/ sqcm) ( and of wall thickness same as main pipe) confirming to IS:4985 including jointing with "T" shaped seal/ rubber ring confirming to IS:5382 and with solvent cement or with rubber ring lubricant as the case may be ( 1) 3mm thick insertion rubber washer to be provided in access door fittings etc.)

Plain bend of required degree with access door, 110 mm dia.

Plain bend of required degree with access door, 75 mm dia.

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