AMC FOR REPAIR AND RECTIFICATION OF MACHINE FOUNDATION AND RCC STRUCTURES AT NTECL

Amount

Providing and fixing temporary engineered steel tubular standard double scaffolding system on the exterior side, maintaining it in a serviceable condition for the required duration as approved and removing it thereafter. The scaffolding system shall be stiffened with bracings, runners, connection with the building etc with suitable working platforms at required locations with essential safety features for the workmen etc complete as per directions and approval of EIC. The elevation area of the scaffolding shall be measured for payment purpose. (for low height repair works where single scaffolding, ladder etc is used measurement& payment will not be considered in this item & rate for this is deemed to have been included in repair items.

Drilling of 12mm dia and fixing non return grouting nozzle using polyster resin mortar LOKFIX P or equivalent (make sika, CICO FOSROC, BASF) make with all labour, tools and tackles as directed by EIC

Supply and application of rapid foaming and setting resin nitofill WS 60 or equivalent (make sika, CICO FOSROC, BASF) make into the prefixed non return grouting nozzle until it refuse using electrically operated high pressure grouting machine (pressure 80-100 psi) with all labour, tools, tackles etc complete as per direction of EIC

Supply and application of rapid foaming and setting resin Nitofill UR 63 or equivalent (make sika, CICO FOSROC, BASF) make into the prefixed non return grouting nozzle until it refuse using electrically operated high pressure grouting machine (pressure 80-100 psi) with all labour, tools, tackles etc complete as per direction of EIC

supply and application of Grouting with approved quality conbextra GPII or equivalent ( make sika, CICO FOSROC, BASF) grouting material below the base plates bolt holes for foundations and strengthening works etc including labour, materials, tools & tackles etc. complete.

Drilling and fixing of hole of diameter in RCC of any grade- Hole has to be drilled of 10mm to 20 mm diameter for required depth for fixing the rebar/anchor in horizontal/over head/ vertical direction. Hole has to be shifted if encountered with any reinforcement during drilling for which nothing extra shall be claimed.

Drilling and fixing of hole of diameter in RCC of any grade- Hole has to be drilled above 20 mm diameter to 32 mm diameter for required depth for fixing the rebar/rebar in horizontal/over head/ vertical direction. Hole has to be shifted if encountered with any reinforcement during drilling for which nothing extra shall be claimed.

Drilling 12mm dia hole of depth (max 300mm) and fixing the 10mm dia nozzle pipe with quick setting cement for grouting. Suitable length of pipe shall be maintained for grouting.

Carrying out pressure grouting using cement grout in the previously fixed nipples at all elevations, loctions including necessary scaffolding, staging, tools, tackles and pressure grouting machine, cleaning of surface etc. complete. the projected portion of nipples shall be cut after completion of grouting. The cost shall be inclusive of Plasticized expanding grout admixture and mixing shall be manufacture recommendation). (Cement will be issued free of cost at NTECL store)

Supply and application of Nitobond EP of FOSROC or equivalent (make sika, CICO FOSROC, BASF) as a bond coat between old and new concrete - Application and surface coverage as per manufacturer recommendation.

Suppy and Inject the epoxy grout Conbextra EP10 or equivalent product (FOSROC, sika, CICO BASF make) in the nozzle using pump with Pressure guage to seal the cracks in the concrete. Preliminary preparation of surface (for plugging cracks, voids) has to be done before start of grout and during grouting for which no extra payment shall be made. Injection of grout must be as per manufacturers’ recommendation

Supply and application of Micro concrete work using Renderoc RG or equivalent product(FOSROC, sika, CICO BASF make) with or without addition of aggregate - If required 6 mm to 12 mm chips aggregate shall be used. (aggregate if added will be paid extra ).

Extra for providing aggregate for micro concrete of required specification- 6 mm to 12 mm chips aggregate with ratio mix as per instruction of EIC shall be added for mico concreting.

Concrete breaking/ dismantling in RCC /PCC for which measurement is not possible by mechanical means with necessary man and machinery as per the instruction of EIC) - Item includes chipping machine, chipper, helper for 8 hours with all accessories

Description of Work / Item(s)

Amount

Removing/ chipping upto 40 mm average depth and cleaning of existing loose concrete carefully by manual or low impact frequency hammer without damaging the existing concrete including cleaning the surfaces by compressed air jet complete including removing loose concrete around the reinforcement. The debris will be disposed upto lead of 100m. the entire surface will be checked by light hammering (using 1 kg hammer ) for detection of loose concrete. Edges of chipped patch shall bear vertical reverse cut with minimum depth at edges as 10 mm. ( prepared patches to be got checked before appliying bond coat) all loose/sound concrete around corroded bar has to be removed to prepare well defined patch.

Cleaning of reinforcement of total rust including from behind the reinforcing bars to give it totally rust free finished steel surface by manual method / sand blasting or by using approved rust remover wherever required (cost of rust remover included). For measurement, surface area of repair work will be taken

Anticorrosive treatment to exposed reinforcement in two coats using approved anticorrosive product. For measurement, square metre of concrete area for repairs is considered. Make- and application shall be as be product recommendation

Providing and applying corrosion inhibitor as per specification on areas demarked specifically by EIC. Make- sika, CICO, FOSROC, BASF and application shall be as be product recommendation

Building up the profile of structure members upto 40mm average depth by using emulsified SBR latex or equivalent product (make SIKA, CICO, FOSROC, BASF). Mix ratio as per product data sheet in 10-15 mm thick layers uncluding levelling profiling complete. polypropylene fibres to be added to reduce shrinkage. proper curing component has to be ensured . For measurement, patch area of repair work will be taken. This item includes the cost of bonding agent to be applied in between the layers of repair mortar. Cement used shall satisfy requirements of OPC 43 grade

Building up the profile of structure members 9mm to 12mm average depth by using emulsified SBR latex or equivalent product ( SIKA, CICO, FOSROC, BASF). Mix ratio as per product data sheet in 10-15 mm thick layers including levelling profiling complete. polypropylene fibres to be added to reduce shrinkage. proper curing component has to be ensured. For measurement, patch area of repair work will be taken. This item includes the cost of bonding agent to be applied in between the layers of repair mortar. Cement used shall satisfy requirements of OPC 43 grade

Demolishing RCC work manually/ by mechanical means including stacking of steel bars and disposal of unserviceable material upto 50m lead as per instruction of EIC

Providing additional steel reinforcement to damaged structural elements including anchoring/welding, bending, placing etc, excluding the cost of steel reinforcement steel ( Steel shall be issued by NTPC free of cost)

chipping (removing of concrete) by less vibration chipping (manual/mechanical) of existing /damaged RCC /PCC / old weathering course on roof etc of any grade including removing of debrise as per the instruction of Engineer In Charge -

Surface preparation - hacking of existing RCC foundation /pedestal and other concrete structure by less vibration electrical chipper machine and cleaning by air blowing.

Supply of epoxy resin anchoring compound HILTI RE 500 v3 (or higher) make hilti of capsule size upto 500 ml to anchor reinforcement /anchor bolts in concrete at all locations

Supply of epoxy resin anchoring compound (Injection mortar) of make Fischer or any approved manufacturer of capsule size upto 500 ml to anchor reinforcement /anchor bolts in concrete at all locations

Preparation of 5 mm thick v slot taken for old foundation cracked area. 5mm V slot has to prepared at cracked/failure point. Any loose material along the crack shall be removed. The slot shall be sealed with suitable component

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