Repair to roof leakage of IQ and exchange area portion only of Door Sanchar Bhawan Building at Rourkela under BSNL SSA Rourkela

Amount

Sub-Head : Concrete Work

Providing and laying cement concrete in retaining walls, return walls, walls (any thickness) including attached pilasters, columns, piers, abutments, pillars, posts, struts, buttresses, string or lacing courses, parapets, coping, bed blocks, anchor blocks, plain window sills, fillets, sunken floor, etc., up to floor five level, excluding the cost of centering, shuttering and finishing :

1:2:4 (1 Cement : 2 coarse sand derived from natural sources : 4 graded stone aggregate 20 mm nominal size derived from natural sources)

Extra for providing and mixing water proofing material in cement concrete work in doses by weight of cement as per manufacturer’s specification.

Sub-Head : Roofing

Providing gola 75x75 mm in cement concrete 1:2:4 (1 cement : 2 coarse sand : 4 stone aggregate 10 mm and down gauge), including finishing with cement mortar 1:3 (1 cement : 3 fine sand) as per standard design :

In 75x75 mm deep chase

Making Khurras 45X45cm with average minimum thickness of 5 cm cement concrete 1:2:4 ( 1 cement : 2 coarse sand : 4 graded stone aggregate of 20mm mnominal size ), finished with 12 mm cement palster 1:3 ( 1 cement : 3 coarse sand ) and a coat of neat cement rounding the edges and making and finishing the outlet complete including dismantaling existing Khurra and disposal of the unserviciable material upto lead of 50 Metre

Sub-Head : Dismantling and Demolishing

Demolishing cement concrete manually/ by mechanical means including disposal of material within 50 metres lead as per direction of Engineer - in - charge.

Nominal concrete 1:3:6 or richer mix (i/c equivalent design mix)

Disposal of building rubbish / malba / similar unserviceable, dismantled or waste materials by mechanical means, including loading, transporting, unloading to approved municipal dumping ground or as approved by Engineer-in-charge, beyond 50 m initial lead, for all leads including all lifts involved.

Sub-Head : Water Proofing

Grading roof for water proofing treatment with

Cement concrete 1:2:4 (1 cement : 2 coarse sand : 4 graded stone aggregate 20mm nominal size)

Cement mortar 1:4 (1cement : 4 coarse sand)

Sub-Head : Repairs to Buildings

Repairs to plaster of thickness 12 mm to 20 mm in patches of area 2.5 sq. meters and under, including cutting the patch in proper shape, raking out joints and preparing and plastering the surface of the walls complete, including disposal of rubbish to the dumping ground , all complete as per directions of Engineer-In-Charge.

With cement mortar 1:4 (1cement: 4 coarse sand).

Providing and laying APP (Atactic Polypropylene Polymer) modified prefabricated five layer, 3 mm thick water proofing membrane, black finished reinforced with glass fibre matt consisting of a coat of bitumen primer for bitumen membrane @ 0.40 litre/sqm by the samemembrane manufactured of density at 25°C, 0.87 - 0.89 kg/litre and viscocity 70 - 160 cps. Over the primer coat the layer of membrane shall be laid using butane torch and sealing all joints etc., and preparing the surface complete. The vital physical and chemical parameters of the membrane shall be as under : Joint strength in longitudinal and transverse direction at 23°C as 350/300 N/5 cm. Tear strength in longitudinal and transverse direction as 60/80N. Softening point of membrane not less than 150°C. Cold flexibility shall be upto -2°C when tested in accordance with ASTM, D - 5147. The laying of membrane shall be got done through the authorised applicator of the manufacturer of membrane :

3 mm thick

Sub-Head : MARKET RATED ITEMS

Dismantling , removing and cleaning old /damged tarfelt i/c scrapping from wall/colmn/roof surace and disposal the same as per direction EIC.

Repairing to the leakage from damaged/rusting old GI pipe inside the wall cutting the wall and replacing with new PVC pipe with fitting and making the damaged surface same as per direction of E.I.C (cost of PVC pipe and fittings will be paid separately)

Repairing to the leakage from damaged old GI pipe/PVC pipe exposed on wall face and near water tank by replacing with new PVC pipe with fittings and making the damaged surface same as per direction of EIC (cost of PVC pipe and fittings will be paid separately)

GIRIJA SHANKAR MISHRA (BID ID -762909)