Demolition of Over Head Tank in Ward 50 Vikas Nagar Lohia Park

Providing, erecting and maintaining temporary scaffolding / working platform around the tank and staging at all levels using MS pipes, Cuplock system or bamboo scaffolding as approved by EIC, with safety nets, warning flags, barricading tape, hard barricades and watchmen posting for the entire duration of demolition works. Scaffolding to be designed for safe access and material lowering at all heights from ground to top of tank (total height approx. 27m). Rate includes erection, daily inspection, maintenance and dismantling after completion. [For 350 KL OHT with 16m staging — perimeter approx. 90m; full height ~27m — larger than 250KL]

Draining, cleaning and making the overhead tank safe before commencing demolition work including: (i) closing all inlet/outlet/washout sluice valves, (ii) discharging all residual water through washout pipe to drain, (iii) cleaning interior of tank of sludge and deposited material, (iv) ventilating tank for minimum 24 hours before any worker enters, (v) gas testing for H2S, CO, O2 and LEL before confined space entry, (vi) obtaining written Permit-to-Work for confined space entry as per Factory Act. Disposal of sludge within 100m lead. [350 KL capacity — higher sludge volume; confined space entry permit per IS 16138:2013]

Providing, erecting and maintaining road barricading with GI pipe framework, safety warning boards and night-warning lights to safeguard traffic and public, including removal after completion of work. The barricade shall be placed at minimum 10m radius around the structure. Rate includes erection, daily maintenance, illumination and final removal. [Perimeter barricading: 240m length × full duration — larger radius for 350KL/27m height]

Appointing and deploying qualified Safety Officer for the entire duration of demolition works as per BOCW Act 1996 and National Building Code Part-7. Safety officer shall conduct daily toolbox talks, maintain permit-to-work register, inspect scaffolding and lifting equipment daily, and submit weekly safety report to EIC. Rate is per month inclusive of all allowances. [Mandatory for elevated structure demolition exceeding 7.5m — NBC Part-7 | 350KL OHT ≈ 4 months demolition]

Providing and maintaining crane / mobile equipment for safe lowering of demolished heavy RCC pieces, cut bars, CI/MS pipes, valves and other heavy items from height to ground level, including operator, fuel and all equipment charges. Crane of adequate lifting capacity (minimum 10T SWL at 10m radius) complying with IS 3938. Rate per day. [Required for safe lowering of tank dome segments, conical bottom pieces and heavy members from RL+27m — 350KL tank significantly heavier than 250KL; use 10T crane minimum]

Dismantling of GI / MS pipe (all sizes) in the staging including inlet main, overflow, washout and vent pipes including cutting, removal of pipe clamps and supports, lowering to ground, stacking within 50m. All dismantled pipes to be handed over to the department store. Rate per RM of pipe (all diameters up to 300mm). [Pipes in staging: inlet 250mm, outlet 250mm, overflow 200mm, washout 150mm = 4 runs × (16m staging + 2m in tank) = 4 × 18m = 72 RM]

Dismantling of CI / DI flanged sluice valves (all sizes) including removal of bolts, nuts, rubber insertions, lowering to ground level, cleaning and stacking within 50m for handing over to department store. Rate per valve (each). [Inlet 250mm: 1 No. | Outlet 250mm: 1 No. | Washout 150mm: 2 Nos. | Isolation at ground: 2 Nos. | Float valve in tank: 1 No. | Sluice on overflow: 1 No. = 8 Nos.]

Dismantling of CI manhole frame and cover (600mm clear opening) including removal of bolts, cover lifting, cleaning and stacking within 50m for handing over to department store. Rate per set (frame + cover). [Top access manhole on dome: 1 Set | Bottom access manhole at ring beam level: 1 Set | Side access on cyl wall: 1 Set = 3 Sets (350KL larger tank — 3 manholes)]

Dismantling of MS/GI staircase (open riser type with landings) including side stringers, treads, handrail, safety cage around vertical ladder and all fixings, cutting brackets from embedded anchors in RCC staging columns, lowering to ground, stacking within 50m and handing over to department. Rate per running metre of staircase height. [External staircase/ladder on staging: 16m staging + 4m top dome access = 20m total run]

Dismantling of CI/GI vent pipe with cowl at top of dome, bird-proof mesh, pipe clamps and all accessories. Lower to ground and hand over to department store. Rate per metre of vent pipe. [Vent pipe on top dome: 1.5m above dome + inside tank = 3.5m total]