Tamil Nadu Transmission Corporation Limited

Tamil Nadu Transmission Corporation Limited has published Work Contract for Structure Modification of 230 KV Bus 2 South at existing Villupuram 230 KV Auto SS using Micro concreting for damaged structure, high performance, Aliphatic Acrylate based Anticarbonation protective coating using Fosroc Deckguard chemical etc at Villupuram 230/110KV Auto SS- 1 SCAFFOLDING 2 All the areas which are under consideration for the repair & rehabilitation are to be provided with double legged scaffolding independent of the work having two sets of vertical supports. The supports shall be sound and strong,tied together with horizontal pieces over which scaffolding planks shall be fixed. Supplyand fixing of scaffolding with bracing including cost ofall material, all labour charges etc., 3 SURFACE PREPARATION 4 Labour charges for chipping the spalled and old concrete of the slab. Check for the phenopthalinetest and if there is no change in colour chip the same furtherdown until, reaching the good or uncontaminated concrete. Clean thesurfaceand make sure that surface is clean and free from loose particle at an average thickness of 50mm. 5 PRIMING OF REINFORCEMENT BARS 6 Clean the rebars using the rust remover if there exists any rust, otherwise clean the rebar free of foreign material. Mix the base and hardner of the zinc rich epoxy resin mechanically using a slow speed heavy duty drilling machine fitted with mixing paddle. Apply the mixed materials to the cleaned rebar and allow it to dry complete. 7 FORM WORK 8 Providing slurry tight form work including strutting, propping, etc., which should not deform or leak due to pressure of micro concrete shall be fabricated in position using 6mm thickcommercialplywoodas per the required line and length at all different floor levels as per the standard specification-complete. Form work should be rigid to prevent loss of micro concrete at all stages & appropriate to the methods of placing & compacting as per standard specification. It should be made of suitable material. The form work shouldbecoatedwithshutterreleaseagent prior tofixing.Therateshallinclude the cost of all the operations and etc., 9 MICROCONCRETE 10 Micro Concretingforthedamagedstructural element like slab/beam/columnbyStocking sufficient quantity of micro concrete and 12mm downgraded chips on sitetoenablethe completion of the pouring in a continuousoperation.An approved concrete mixer or a slow speed heavy duty drilling machine fitted with mixing paddle shall be used. Mix the micro concrete and the 12mm down grade chips in the ratio of 1: 0.5 (one part of Rendroc RG and 0.5 part 12mm down chip) by weight with required quantity of water powder ratio 0.16 and place the same to the prefixed formwork well before the epoxy jointing compound dries up. Remove the formwork after 24 hours in the case of columns and after a period of 72 hours in the case ofslaband beam and check for any surface defects and if soapply the polymer modified mortar - complete. The rate shall include the cost of all the operations and complete. 11 PROTECTIVE COATING 12 Prepare the surface neatly ensuring thereisnofine dust accumlated over the area, andwashthe surface and allow it to dry prior to theapplicationofthe primer. Mix the high performacne, aliphatic acrylate based anticarbonation proteive coating primer Fosroc Deckguard S Primer to the prepared surface and allow the same ro dry over a period of 2 hours over which Deckguard S top coat shall be applied in two mutually perpendicular directions in order to obtain aDFTof 150 microns over the prepared area. 13 GST 18 % to be entered by the Biders . Last date of submission for this tender is 2025-10-06. This is a Substation tender in Villupuram, Tamil Nadu