Replacement of the old Mild Steel fixed glazing on the east and south face with new UPVC glazing cum shutter system window at the 3rd floor, along with allied civil works at the Bank Main Office Building, Kolkata, West Bengal

BoQ

Providing and erecting strong, free standing and safe, steel double scaffolding: Providing and erecting strong, free standing and safe, steel double scaffolding using cup lock type / H type frames, made with Mild Steel (M.S.) tubes having diameter not less than 40 mm, at a spacing not exceeding 1.50 centre to centre for vertical props, horizontal bracings, safety rails / barricades etc. The steel tubular sections (vertical & horizontal) shall be connected with cup & lock / knock-down type coupling / fastening mechanisms, for easy erecting and dismantling, with properly supported stairs, platforms / staging, safety rails / barricades, with wooden / steel planks / panels, to facilitate working / inspection at all levels. The scaffolding shall not be supported on the buildings / structures and shall be retained till the completion of the works including dismantling, plastering, fixing of granite slab lining for the openings, installation of windows & grill and repairs & re-paining of the surroundings etc., inspection, measurements etc., and then it shall be dismantled and removed carefully, disposed, and carted away from the Bank's premises. Area in elevation between the vertical supports at ends, topmost horizontal bracing and ground level, of each bay shall be measured, while arriving at the quantities. The net face area is measured once throughout the work.

Dismantling / disengaging and removing the existing Mild Steel (M.S) windows having area beyond 3.00 Sqm per window: Carefully dismantling and removing the existing Mild Steel (M.S) windows on the second floor having approximate overall dimensions – 1.77 m x 3.25 m , on the second floor and of the Bank’s Main Office Building along with M.S / wooden outer frames, shutters, glass, fittings / fixtures / fasteners, hardware etc., shifting and disposing the dismantled and removed materials including the salvageable materials at location(s) shown by the Bank’s Engineers within the Bank’s premises in an organised manner, carting the debris and non-salvageable items away from the Bank's premises and dumping them at a dumping yard, authorized by Kolkata Municipality Corporation or any other local body authorities etc., complete as directed by Bank's Engineer. Care should be taken to avoid damages to the structural members, other installations, fittings & finishes including dado on both internal and external surfaces of the walls, free falling of dismantled materials including glass panels etc., during the dismantling, shifting, and disposing. Any damage(s), accidentally caused to the structural members, other installations, fittings, finishes including dado on both internal and external surfaces of the walls etc., shall be mended to reinstate the same to their original condition(s). The scope of work shall include temporarily closing the openings left on the wall(s), after removal of the windows, by providing and fixing 6mm plywood panels / planks & tarpaulins, till such time the new windows are installed in those openings. The area of work shall be temporarily secluded by providing and fixing screens / tarpaulins to avoid spreading of dust to the other areas during dismantling. The lining on the sills, jambs and soffits of the openings of the windows to be dismantled and removed and cladding on the external & internal faces of the walls adjacent to these openings, which must be retained shall be properly secured from getting loose / falling by suitably planking / propping and fastening by providing and fixing counter sunk screws, providing and applying adhesives / glues etc. Rebate (scrap / buy-back value) for taking away the salvageable items shifted and stacked shall be considered separately under item No. 6 below.

Providing and fixing minimum 16 mm thick granite slabs as lining on the sills of the openings for windows. Suitably preparing the sills, soffits & jambs of the openings left on the walls after dismantling and removing the windows as per item No. 2 above, by carefully dismantling and removing the existing plaster, glass or clay ceramic mosaic tile / granite / sand / granite stone slab lining / cladding with their back mortar, providing and rendering cement plaster in C.M 1:3 admixed with water proofing compounds or ready-mix plaster of approved make / brand, providing, cutting to the required sizes and fixing minimum 16 mm thick approved quality and shade granite slabs (lengthwise) in the sill in single piece without joints for each side), fixed with cement slurry or approved quality and make tile adhesives, over the plastered surfaces / stone slab lining / cladding wherever they have to be retained as per site conditions. The exposed edges on both sides of the slabs shall, project beyond the faces of the walls, by 5 mm to 10 mm and be half rounded and machine polished to get the same finish of the pre-polished surface of the slab. The scope of the work shall include, mending the damages (both internal and external surfaces) generally matching with the surrounding finishes and re-painting of the affected areas. The scope of work shall include shifting and disposing the dismantled and removed materials at location(s) shown by the Bank’s Engineers within the Bank’s premises in an organised manner and carting the same away from the Bank's premises and dumping them at a dumping yard, authorized by Kolkata Municipality Corporation or any other local body authorities etc., complete as directed by Bank's Engineer. Care should be taken to avoid damages to the walls / structural members, other installations, fittings & finishes, free falling of dismantled materials etc., during the dismantling, shifting and disposing. (Basic price of granite slabs - ₹ 2,100/- per Sqm. Exclusive of GST)

Providing and fixing minimum 16 mm thick granite slabs over the already provided sill in item no. 3: Providing, cutting to the required sizes and fixing minimum 16mm thick approved quality and shade granite slabs (lengthwise in single piece without joints for each side) overlapping the granite sill already provided in item no. 3 throughout the length and glued together with approved quality and make adhesives in the longitudinal direction as directed by the Bank’s Engineer, to prevent seepage of water through the joints. The exposed edge which faces inside the hall shall, project beyond the faces of the walls, by 5 mm to 10 mm and be half rounded and machine polished to get the same finish of the pre-polished surface of the slab. The scope of the work shall include, mending the damages (both internal and external surfaces) generally matching with the surrounding finishes and re-painting of the affected areas. The scope of work shall include shifting and disposing the dismantled and removed materials at location(s) shown by the Bank’s Engineers within the Bank’s premises in an organised manner and carting the same away from the Bank's premises and dumping them at a dumping yard, authorized by Kolkata Municipality Corporation or any other local body authorities etc., complete as directed by Bank's Engineer. Care should be taken to avoid damages to the walls / structural members, other installations, fittings & finishes, free falling of dismantled materials etc., during the dismantling, shifting and disposing. Providing, erecting, removing and taking away necessary scaffolding and staging if required for the successful execution of the work is also included in the scope of the work. Scope includes a secondary overlapping flashing layer of matching 18mm granite glued in the longitudinal direction using approved adhesive to form an absolute watertight step barrier against rainwater seepage. (Basic price of granite slabs - ₹ 2,100/- per Sqm. Exclusive of GST)

Providing and fixing factory made uPVC casement cum fixed DGU glass system windows having approximate overall dimensions - 1.75 m x 3.25 m, with two openable type shutters and 4 fixed panels: Providing and fixing, approved make and shade (Pristine White or approved equivalent), factory made UPVC casement cum fixed DGU glass windows having approximate overall dimensions – 1.75m X 3.25m, , comprising the following: i. The window system shall be fabricated, using approved make standard extruded UPVC casement window sections having cross-sectional dimensions not less than 118 mm x 58 mm ( minimum 2.5mm) thick outer wall, with multi-chamber construction and factory fabricated as outer frames and 118 mm x 80 mm (minimum 2.5mm) thick outer wall, with multi-chamber construction as transom/mullions, or the sections and with multi-chamber construction as transom/mullions/outer frames etc as specified by the original manufacturer. ii. All corners and joints of the outer frame & shutters shall be, mitred cut & fusion welded, without any mechanical joint. The outer frames and mullions shall be fastened together in proper line and level by fusion welding/mechanical joints using ‘L’ shaped G.I / S.S cleats / clamps & screws of approved size & design suitable to prevent lateral movements. All welded joints shall be neatly trimmed & feature-grooved / raised-nib finished, to make the finished window system, free from all sharp edges and burrs. The mechanical joints shall be glued together / filled and finished with approved quality glues / sealants to ensure proper finish of the joint. The outer frames shall have holes with caps to ensure proper drainage of rainwater. iii. The outer frames shall be firmly secured to the granite slab cladding / frame / lining, to be provided under item No. 3 above, using suitable numbers of M-8 x 75 mm / M-10 x 100 mm S.S anchor fasteners for each side (sill, soffits and jambs), recommended by the manufacturer. The joints between the window frames and the granite slab frames / lining, on all the sides, shall be sealed with providing and applying, gun grade UV-resistant silicone-based sealants or equivalent as per manufacturer’s specification from outside and from inside. iv. The upper fixed portion ( please go through the indicative size attached ) of the windows at top, comprising of 3 Nos. fixed glazing, shall be provided having equal dimensions, factory made using approved make, casement window sash sections having cross-sectional dimensions not less than 65 mm x 80 mm (minimum 2.5mm) thick outer wall, with multi-chamber construction, approved quality, make hermitically sealed DGU glass (6mm Toughened + 12mm Air gap + 6mm Toughened), outer glass shall be 6mm thick tempered & low E reflective glass and inside glass shall be 6mm thick clear toughened glass of approved make, with an aluminum spacer of 12mm (having desiccants to prevent condensation) & gasket shall be EPDM cut to the required sizes, of approved quality. v. The lower portion ( please go through the indicative size attached ) of the windows at bottom, comprising of 1 Nos. fixed glazing at the center and 2 Nos. openable shutter on either sides of fixed glazing, having equal dimensions, or as per required by the Bank, factory made using approved make, casement window sash sections having cross-sectional dimensions not less than 65 mm x 80 mm (minimum 2.5mm) thick outer wall, with multi-chamber construction,or the sections and with multi-chamber construction as transom/mullions/outer frames etc as specified by the original manufacturer., approved quality, make hermitically sealed DGU glass (6mm Toughened + 12mm Air gap + 6mm Toughened), outer glass shall be 6mm thick tempered & low E reflective glass and inside glass shall be 6mm thick clear toughened glass of approved make, with an aluminium spacer of 12mm (having desiccants to prevent condensation) & gasket shall be EPDM cut to the required sizes, of approved quality. Each shutter shall be fastened to the outer frame / mullion using a set of 2 numbers of S.S 304 grade Friction Stays of approved make. Each shutter shall also be provided with approved quality and make locking arrangement comprising powder coated Zinc alloy (white shade) casement handle spindle, zinc plated mild steel multi point locking comprising casement striker axis, espag back set concealed inside the grove of the sash and having transmission gear with keeps for casement window, including drilling holes of suitable diameters, fixing using suitable S.S / G.I screws etc. vi. The outer frames, mullions and shutters shall be provided with EPDM (Ethylene Propylene Diene Monomer) / rubber gaskets / buffers of approved quality to make the window air tight in closed condition. vii. UPVC sections / profiles, such as outer frames and frames of the shutters shall be suitably reinforced with Galvanised Mild Steel strips, as specified by the specifications of the original manufacturer and as directed by the Bank’s Engineer. viii. Rate should include the installation, delivery, handling charges etc 1. The Reference sketches and measurements are representational indicative only for quoting purpose. As the CONTRACTOR at his own cost shall provide & get the approval from Bank for the design & shop drawings as specified above after the award of work. 2. The indicative dimensions /Opening size may vary slightly during execution, no extra claim shall be made for the same as the CONTRACTOR at his own cost shall provide & get the approval from Bank for the design & shop drawings as specified above after the award of work. 3. The windows are to be fixed on finished granite stone sill (stepped form in ‘Z’ profile) and the actual sizes may be obtained on completion of granite window sill. Note1- Supplier should be submitting wind load calculation & validation complying with IS-875(Part III) that is the window should withstand cyclonic wind speed as per IS 875 (Part III), in this regard a test certificate from the manufacturer (in open, closed condition) need to be submitted for whole window, glass, hinge etc. before material supply and installation. The installation must carry a warranty of 10 years against leakproof installation and a warranty for a period of 10 years against manufacturing defects in window profile sections. There should be Warranty 5 years on hardware from the day of the virtual completion of the work. Note2: Prior to fabrication the Bidder has to submit a letter of authorization from the window fabricator stating that he/she is authorized dealer/fabricator of the window brand which he/she is supplying.The bidder has to submit the detailed shop drawing including the section of the outer frame/sash/mullion members used and opening pattern along with the wind load calculation and a structural stability certificate against the wind load up to a height where the windows will be installed. All hardware fittings must be of SS 304 grade, except handles to be of zinc/Al. alloy casted with powder coated. Hardware such as handle & friction hinge stay shall be endurance tested for at least 20,000 cycles/3 years. The profile section of the windows must be submitted to the bank. Only after getting banks approval (For profile section) the fabrication shall be started. Installation shall be done by manufacturer with skilled labours. Bidders must submit sample of handles/locks etc. to the Bank’s Engineer. 5% tolerance is allowed in the section sizes. If a section size falls beyond the tolerance limit, the same shall be rejected.

Rebate (scrap / buyback value) for taking away the salvageable items: Rebate (scrap / buyback value) for taking away the reusable / salvageable items removed and stacked under any of the above items, which are not required to be re-used in the work under any of the items above, including GST & TCS - (B).