Repair and Restoration works at various school in Himachal Pradesh Under PDNA 2023 SH Repair of School Building at GPS Ram Sahrai Takka District Una HP

Earth work in excavation by mechanical means (Hydraulic excavator)/ manual means in foundation trenches or drains (up to all width), including dressing of sides and ramming of bottoms, up to all lift, including getting out the excavated soil and disposal of surplus excavated soil all lead and lifts as directed by the Engineer-in- charge. (a) All kinds of soil.

Providing and laying 3 mm thick 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 same membrane 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 including carriage of material in all leads and lifts.

Making plinth protection 50mm thick of cement concrete 1:3:6 (1 cement : 3 coarse sand (zone - III) : 6 graded stone aggregate 20 mm nominal size) over 75mm thick bed of dry brick ballast 40 mm nominal size, well rammed and consolidated and grouted with fine sand, including necessary excavation, levelling & dressing & finishing the top smooth including carriage of material in all leads and lifts.

Providing and laying cement concrete 1:5:10 (1 cement : 5 coarse sand) : 10 graded stone aggregate 40 mm nominal size) 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 all level, including the cost of centering, shuttering and finishing including carriage of material in all leads and lifts.

Providing and laying in position cement concrete of 1:4:8 (1 Cement : 4 coarse sand) : 8 graded stone aggregate 40 mm nominal size) excluding the cost of centering and shuttering - All work up to plinth level including carriage of material in all leads and lifts.

Reinforced cement concrete work in beams, suspended floors, roofs having slope up to 15° landings, balconies, shelves, chajjas, lintels, bands, plain window sills, staircases and spiral stair cases above plinth level up to floor five level, excluding the cost of centering, shuttering, finishing and reinforcement with 1:1.5:3 (1 cement : 1.5 coarse sand) : 3 graded stone aggregate 20 mm nominal size) including carriage of material in all leads and lifts.

Suspended floors, roofs, landings, balconies and access platform

Steel reinforcement for R.C.C. work including straightening, cutting, bending, placing in position and binding all complete above plinth level including carriage of material in all leads and lifts. (a) Thermo-Mechanically Treated bars of grade Fe-500D or more.

Steel work welded in built up sections/ framed work, including cutting, hoisting, fixing in position and applying a priming coat of approved steel primer using structural steel etc. as required. including carriage of material in all lead and lifts (a) In gratings, frames, guard bar, ladder, railings, brackets, gates and similar works