Special Repairs to Admin Block Power House AC Plant Engg Offices and other Buildings in City Side at Coimbatore International Airport

Amount

Providing and fixing up to floor five level precast cement concrete solid block including hoisting and setting in position with cement mortar 1:3 (1 cement : 3 coarse sand), cost of required centering, shuttering complete : 1:1½:3 (1 Cement : 1½ coarse sand (zone-III) derived from natural sources : 3 graded stone aggregate 20 mm nominal size derived from natural sources).

Centering and shuttering including strutting, propping etc. and removal of form for : Suspended floors, roofs, landings, balconies and access platform with water proof ply 12 mm thick

Centering and shuttering including strutting, propping etc. and removal of form for : Lintels, beams, plinth beams, girders,columns bressumers and cantilevers with water proof ply 12 mm thick

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

15 mm cement plaster on rough side of single or half brick wall of mix : 1:4 (1 cement: 4 coarse sand)

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 direction of Engineer-in-harge. : With cement mortar 1:4 (1cement: 4 coarse sand).

Providing and fixing double scaffolding system (cup lock type) on the exterior side, up to seven story height made with 40 mm dia M.S. tube 1.5 m centre to centre, horizontal & vertical tubes joining with cup & lock system with M.S. tubes, M.S. tube challies, M.S. clamps and M.S. staircase system in the scaffolding for working platform etc. and maintaining it in a serviceable condition for the required duration as approved and removing it there after .The scaffolding system shall be stiffened with bracings, runners, connection with the building etc wherever required for inspection of work at required locations with essential safety features for the workmen etc. complete as per directions and approval of Engineer in-charge .The elevation area of the scaffolding shall be measured for payment purpose .The payment will be made once irrespective of duration of scaffolding.

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 same membrane manufactured of density at 25°C, 0.87 - 0.89 kg/litre and viscosity 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

Demolishing brick work manually/ by mechanical means including stacking of serviceable material and disposal of unserviceable material within 50 metres lead as per direction of Engineer-in-charge. : In cement mortar

Chipping of unsound/weak concrete material from slabs, beams, columns etc. with manual Chisel and/ or by standard power driven percussion type or of approved make including tapering of all edges, making square shoulders of cavities including cleaning the exposed concrete surface and reinforcement with wire brushes etc. and disposal of debris for all lead and lifts all complete as per direction of Engineer-In-Charge : 50 mm average thickness

Cleaning of reinforcement from rust from the reinforcing bars to give it a total rust free steel surface by using alkaline chemical rust remover of approved make with paint brush and removing loose particles after 24 hours of its application with wire brush and thoroughly washing with water and allowing it to dry, all complete as per direction of Engineer-In-Charge. : Bars above 12 mm diameter

Drilling suitable holes in reinforced or plain cement concrete with power driven drill machine to a minimum depth of 100mm upto 200mm in RCC beams, lintels, columns and slabs to introduce steel bars for sunshades/balconies including fixing the steel bars in position using epoxy resin anchor grout of approved make but excluding the cost of reinforcement, all complete as per direction of Engineer-In-Charge.

Providing, mixing and applying bonding coat of approved adhesive on chipped portion of RCC as per specifications and direction of Engineer-In-charge complete in all respect. : SBR Polymer (@10% of cement weight) modified cementitious bond coat @ 2.2 kg cement per sqm of surface area mixed with specified proportion of approved polymer

Providing, mixing and applying bonding coat of approved adhesive on chipped portion of RCC as per specifications and direction of Engineer-In-charge complete in all respect. Epoxy bonding adhesive having coverage 2.20 sqm/kg of approved make

Providing and injecting approved grout in proportion recommended by the manufacturer into cracks/honey-comb area of concrete/ masonry by suitable gun/pump at required pressure including cutting of nipples after curing etc. complete as per directions of Engineer-in- Charge. (The payment shall be made on the basis of actual weight of approved grout injected.) : Stirrer mixed SBR Polymer (of approved make) modified Cement slurry made with Shrinkage Compensating Cement in concrete/RCC work.

Supply and stacking including loading, unloading and secure stacking at site ready to use micro concrete Renderoc RG of FOSROC or equivalent self levelling flow grade micro concrete composed of good quality special cement, graded aggregates & additives/ chemicals to produce a free flowing non shrink repair material used & designed for repairing of damaged reinforced concrete elements like columns, beams & structure where the areas are restricted or not easily accessible for proper placement of concrete using vibrator .Bags with valid shelf life only shall be permitted and shall be consumed within the period of shelf life nothing extra shall be paid on expiry of shelf life.

Cutting, demolishing of old RCC Over Head Water Tank lying inside shaft of departure terminal building by engaging approved demolishing agency having previous experience in similar nature of works. RCC slab / RCC wall / RCC column members shall be cut into pieces of required size 0.30x0.30, 0.30x0.60 and 0.60x0.91 OR approved size by using wall saw cutter (Diamond wire saw rope) machine of approved make including safely lowering the cut pieces / blocks to ground level using chain pully / suitable similar arrangement including necessary anchoring/staging. Demolished / cut RCC blocks shall be taken outside from shaft / terminal building & stacking at designated place (minimum 100M far from terminal building) and safely transport from airport premises to approved local dump yards including necessary arrangement of loading & transportation charges etc complete as per the directions of EIC. All the debris generated (at inside shaft & outside stacking area) during demolishing & stacking shall cleared by agency on own expenses. Cost of work shall include all charges for deploying necessary machinery, skilled man power (including necessary insurance & safety measures), shifting of material & transport to dump yard & including cost adjustment for reinforcement bars generated from demolished concrete member (Approximate 2.5 to 3 Mt of reinforcement may be present in RCC structure). Work shall be carried inside terminal building during night 11 PM upto 6 AM without causing hindrance to passenger movement & operations.

Shotcreting R.C.C. columns, beams and slabs etc. using in layers with approved grade and mix of micro concrete having the specified minimum characteristic compressive strength [with Renderoc RG or equvalent self levelling micro concrete, cement and silt free graded stone aggregate of 10 mm maximum size in proportion as per design criteria] as directed by Engineerin- Charge Note: Rates shall include the providing necessary ground wires etc. The levelling gauges, if used, shall be paid for separately. Rates shall not include Rendroc RG or Equivalent Micro Conrete, cement, centering and shuttering. Payment under this item shall be made only after proper wet curing has been done and surface has been satisfactorily evaluated by sounding/ tapping with a blunt metal instrument.