NIT NO 08 KOLAR YEAR 2022-23

Amount

Special Repair of RCC Gentry Structure

proiding and fixing double scaffolding system on the exterior side of building/structure, up to 15 meter height, above ground level, including additional rows of scaffolding in stepped manner as per requirement of site, made with 40mm dia M.S. tube, placed 2.2metre centre to centre, horizontal & vertical tubes joint, with M.S tubes, M.S tube challis, M.S. clamps and staircase system in the scaffolding , working platform , walkway wherever required , lighting arrangement etc. and maintaining it in serviceable condition for execution of work of civil reapir/ structural repair & rehabilitation /cleaning and /or pointing and/or applying chemical and removing it thereafter . The scaffolding system shall be stiffened with bracing, runners, connecting with the building etc. wherever required, if feasible, for inspection or work at required locations with essential safety features for the workman etc., complete as per directions and approval of engineer-incharge. Note:- 1. The elevation area of the scaffolding shall be measured for payment purpose. 2. The payment will be made once only irrespective of time duration of scaffolding.for execution of all item for such works . 3. No deduction shall be made from the DSR / NDSR B.O.Q. items of the contract for the component of scaffolding included in the individual item.

Providing and erecting the safety net of opening 75 mmx75mm size at 1st floor level to prevent the debris falling on ground during progress of work and keeping the same in position during the entire period of work

Carefully removing only existing loose damaged and disintegrated plaster of any thickness, of Columns, Beams, Slabs, Parapets,Drops,Pardees Chajja,Soffits and Brickwork etc.

Cutting/Chipping of unsound /weak concrete materials for RCC Columns, Beams, slabs, Chajjas, fins, Lintels, and Pardees etc. At all heights and locations by means of chisel and hammer or by low impact high frequency hammer/chipper without damaging the sound Concrete removing all loose materials,laitances etc., from the concrete surface and exposing the reinforcement alround the steel bars up to 10mm gap wherever required, finally cleaning the exposed concrete surface with high pressure water Jet and Compressed air complete as per direction of Engineer-in-charge. (MODE OF MEASUREMENTS - Chipped concrete surface Area)

Cleaning existing reinforcement with rotory wire brush or any other suitable way including from behind and around the reinforcement bars, making surfaces free from loose material dirt etc. complete. Applying two coats of alkaline rust converting primer confirming to ASTM-B 117,on the rebars, by brush, i/c cleaning the reinforcement with wire brush to remove loose rust spalls, with time interval of One Hours between each coat (MODE OF MEASUREMENTS - concrete surface area with exposed reinforcement)

Makeup lost steel area due to corrosion by providing additional steel reinforcement. The steel shall confirm to IS 1786 grade Fe 415/ Fe 500. Anchor the steel rebar in sound concrete body up to desired depth by structural GRADE adhesive. Fixing of rebars is to be with pre left binding wires/Arch welding with existing steel at regular grid after aligning concrete profile with new mortar up to existing steel face.

Nozzle Fixing:- Drilling 12-16 mm dia Nozzle Fixing:- Drilling 12-16 mm dia holes at honeycomb portions/ voids/ construction joints/ cracks etc. spaced at specified spacing and placing 8-12mm dia nozzle of length 75mm suitable for grouting into a 150 mm deep hole using polymer mortar including cutting of nozzle after the grouting and finishing with polymer mortar etc. complete.

Injection grouting : Providing and applying injection groutingthrough the nozzles provided into the cracks/ honeycombedareas by suitable grouting pump under pressure till the refusal including all labour , supervision, tools and tackles and transportation etc. complete as per direction of Enginner -incharge (A) Low viscous(200 CPS) Epoxy Resin like BASF Msterinject 1315/Nitofil UR63 of Fosrock/ Dr. Fixit Plain injection or equivalent material for R.C.C. columns

Providing, fixing the MS Wire Fabric 25 x 25 mm mesh of 12 SWG to exposed Reinforcement Surfaces of Structural members such as Columns, Beams, Slabs etc for repair, rehabilitation works at all heights and locations complete as per direction of Engineer in Charge (Cost of P/F Mechnical/Chemical fasteners if required،shall be paid separately)

Anticorrosive Treatment to Reinforcement by IPNET RB Application of two coats of IPNET RB (CBRI Know how) on expose reinforcement in two coats with time interval of minimum 4 hours between each coat. The application shall be by brush.

Providind and fixing Water Tight Centering / shuttering including strutting propping etc and removal of form for :RCC Columns, Beams, slabs, Chajjas, fins, Lintels, and Pardees etc. At all heights and locations

Purchasing of glassware for 34 MGD TP kolar

Providing Encasement/ jacketing to Columns ,Beams/Pardees/ Fins. etc. For all lifts and locations by :- (A) M-35 (Free flow, Non Shrink,Self leveling and Auto compacted Ready to Use Micro Concrete)

Providing Encasement/ jacketing to Providing Encasement/ jacketing to Columns ,Beams/Pardees/Fins. etc. For all lifts and locations by :-(A) M-35 (Free flow, Non Shrink,Self leveling and Auto compacted Ready to Use Micro Concrete)

SPECTRA ENTERPRISES