Tender For Structural Repairs Of ‘A’ Block In Nabard Kerala Staff Quarters, Thiruvanthapuram, 695012, thiruvananthapuram-Kerala

Tender for Structural Repairs of ‘A’ Block in NABARD Kerala Staff Quarters, Thiruvanthapuram, 695012; 1 Providing and errecting strong, self supporting and safe two leggeded scaffolding using MS Pipes with clamp fixing type , staircase and walkway to facilate working/ inspection at all level. Thedouble scaffolding with a minimum spacing of 600 mm c/c between parallaed rowsand vertical memebrs at maximum spacing of 1200 mm c/c and horizontal bracing at maximumspacing of 900 mm c/c with properly supported platforms of aluminium planks to workat various levels.The scaffolding shall not be supported on the building/ structure. The scaffolding shall be reatained tillthe completionand of the work including curing, painting, inspection, insertion of caplets, drilling holes etc. The MS poles and clamps to be painted and kept in condition. 2 Providing and erecting polypropylene/polyethylene dust net along the periphery during construction to control debris & dust from spreading beyond construction work as directed by Engineer In charge 3 Chipping of unsound/weak concrete material from slabs, beams, columns etc. 50mm average thickness 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 4 Providingandinjectingapprovedgroutin proportion recommended by the manufacturer into cracks/honey-comb area of concrete / masonry by suitable gun/ pump atrequiredpressureincludingcuttingof nipplesaftercuringetc.completeasper directions of Engineer-in-Charge. Thepaymentshallbemadeonthebasis of actual weight of approved grout injected. 5 Providing,mixingandapplyingSBR polymer(ofapprovedmake)modified Cement mortar in proportion of 1:4 (1 cement: 4 graded coarse sand with polymer minimum 2% by wt. of cement used) as per specifications and directions of Engineer-in- charge. Measurement and payment: The pre- measurementofthicknessshallbedone justafterthesurfacepreparationis completedandPaymentunderthisitem shall be made only after proper wet curing has been done and surface has been satisfactorilyevaluatedbysounding/ tapping with a blunt metal instrument and/or the75mmsizecubecrushingstrengthat the end of28 days to be notless than 30 N/Sqmm2). 25 mm average thickness in 2 layers. 6 Providing and applying rust cleaner of approved make over prepared reinforcement, including removing concrete all around reinforcement including from behind the reinforcing bars by manual methods such as hammering the rebar, using wire brushes, chiseling, etc. and applying rust removing solution of approved make with cotton waste swab to reinforcements etc. complete as directed by Engineer-In-Charge. Make- Dr FIXIT/ FOSROC/ Krishna Conchem/BASF/Sika as appproved by Engineer In charge 7 Providing and applying two coats of anticorrosive epoxy phenolic rebar protective system IPNet RB of M/s Krishna Conchem or equivalent of approved make and quality comprises of resin and hardener mixed in equal proportion by volume with minimum 9-10 hours between the coats, sprinkling dry sand when 2nd coat is tacky so as to provide rough finish and ensuring air curing of minimum 10 hours after the top coat before any subsequent treatment etc complete all as specified and as directed by Engineer-in-Charge. Make- Dr FIXIT/FOSROC/ Krishna Conchem/BASF/Sika as appproved by Engineer In charge 8 Providing and inserting 12mm dia injectionnippleinhoney combareaandalongcracklineincluding drilling of holes of required diametre (20mm to 30mm) up to depth from 30mm to 80mm at required spacing and making the hole & crack dust free by blowing compressed air, sealing the distance between injection nipple with approximately 1 kg of adhesive chemical of approved make and allow it to cure complete as per direction of Engineer-In-Charge. 9 Providing and casting and repairing of excessively damaged members with microconcrete at all levels with all leads and lift as directed including mixing , laying, levelling, finishing including curing complete all as specified and directed by Engr-in-Charge. Note: Grade of Micro-concrete to be M 30 at 28 days and shall be sourced from manufacturers such as Dr. fixit/Fosroc / SIKA / BASF / Krishna Conchem 10 Providing 12 mm thick plastering to existing masonry walls with waterproofing chemicals in lime modified mortar 1:4 (1 cement : 4 sand), including scaffolding, rounding of all corners wherever required, smooth rendering, curing, etc. complete at all heights and as per the instruction of the Engineer-in charge. The rate shall include dismantling old plaster or skirting raking out joints and cleaning the surface for plaster, cleaning the existing wall surface with air and water jet.including disposal of rubbish to the dumping ground within 50 metres lead. 11 Removing the existing waterproofing layers from terrace carefully including tiles , brick bat coba , china mosaic IPS , tarfelting if any including vattas etc. complete lowering down and stacking the debris in compound as directed and carting away the debris out side the premises etc. complete. 12 Providing and laying integral cement based water proofing treatment including preparation of surface as required for treatment of roofs, balconies, terraces etc consisting of following operations: a) Applying a slurry coat of neat cement using 2.75 kg/ sqm of cement admixed with water proofing compound conforming to IS.2645 and approved by Engineer-in-Charge over the RCC slab including adjoiningwalls upto 300 mm height including cleaning the surface before treatment. b) Laying brick bats with mortar using broken bricks/brick bats 25 mm to 115 mm size with 50% of cement mortar 1:5 (1 cement : 5 coarse sand) admixed with water proofing compound conforming to IS : 2645 and approved by Engineer-in-Charge over 20mm thick layer of cement mortar of mix 1:5 (1 cement : 5 coarse sand) admixed with water proofing compound conforming to IS : 2645 and approved by Engineering-Charge to required slope and treating similarly the adjoining walls upto 300 mm height including rounding of junctions of walls and slabs c) After two days of proper curing applying a second coat of cement slurry using 2.75 kg/ sqm of cement admixed with water proofing compound conforming to IS : 2645 and approved by Engineer-in-Charge. d) Finishing the surface with 20 mm thick jointless cement mortar of mix 1:4 (1 cement : 4 coarse sand) admixed with water proofing compound Conforming to IS: 2645 and approved by Engineer-in-Charge including laying glass Fibre cloth of approved quality in top layer of plaster and finally finishing the surface with trowel with neat cement slurry and the surface is to be fixed with well burnt terracotta tile.. e) The whole terrace so finished shall be flooded with water for a minimum period of two weeks for curing and for final test. All above operations to be donein order and as directed and specified by the Engineer-in-Charge. With average thickness of 120 mm and minimum thickness at khurra as 65 mm. 13 Providing 18-20 mm thick External plastering to existing masonry walls and chejja in lime modified mortar 1:4 (1 cement : 4 sand) mixed with polypropylene fibersof approved quality at the rate of 125 gms per bag of cement or as per manufacturer’s specification, rounding of all corners wherever required, smooth rendering, curing, etc. complete at all heights and as per the instruction of the Engineer-in charge. The rate shall include cleaning the existing wall surface with air and water jet.

Sr No	CorrigendumDate	Corrigendum	CorrigendumType	NewSubmissionDate
1	08-10-2024	Type of grouting material	Other	10-10-2024

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