Repair and Rehabilitation of River Sluice of Gatana Dam in Sivasailam Village in Tenkasi Taluk and District

Chipping and Racking out of the existing loosely laid cement pointing on the horizontal and vertical joints of RR / CR masonry in the Dam sluice to remove all the loose pointing using chipping machine with appropriate tool (manual / mechanical means),leaning the raked joints with wire brush followed by compressed air and water jets with variable pressure of 30 – 250 bars, drying the raked joints. The rate shall include the cost of materials, hire charges of necessary equipment, cost for disposal of debris beyond a distance of 500 m and stacking outside submerging periphery of the reservoir, scaffolding etc.complete as per the direction of the departmental officers.

Cavity Filling - Providing and filling the deeper cavities of the RR / CR masonry which are beyond 5 cm and up to 18 cm using non-shrink, cementitious micro concrete of TOP CRETE 80 or equivalent mixed with water at ratio 0.16 to fill the gaps where normal access is restricted and to achieve proper compatibility and placement without vibration. The micro concrete shall contain no chloride admixture and provides minimum compressive strength of 40 N/mm² in 7 days & 50 N/mm² in 28 days when tested in 70.7mm cube. The product shall have controlled expansion characteristics of 1 to 4% when tested as per ASTM C 827 – 1987. The rate shall include the cost of materials; hire charges of necessary equipment, scaffolding / hanging platform, pulley arrangement, etc complete as per the direction of the departmental officers.

Injection grouting - Supply and application charges for Low Viscosity injection by using TOP ACRYL GEL four component special hydrophilic resin with very low viscous and adjustable reaction time or equivalent and as instructed by the Engineer In charge with the help of quick fix product & Inject the high pressure air through the nozzles. Pressure grouting with high strength injection resin with help of injection gun or similar equipment of grouting pump at a steady pressure as recommended by the manufacturers like (CONFIXINDIA) i.e Top ACRYLIC GEL or equivalent shall be injected in to it. The work shall complete in all respects in line with manufactures recommendations / specifications. by using Double component pneumatically operated injection pump at variable pressure as per the requirement and direction of engineer incharge.Grouting or pumping the resin injection material, special injecting Packers (The rate shall included for Machinery , safety , providing PPE's to the workers/staffs, and application of grouting material, drilling, Fixing & , Incharge (EIC) with all tools and tackles including all necessary documentation procedure as per departmental direction.

Raised Pointing - Providing polymer modified repair mortar for masonry joint filling to a depth of 50mm including preparing of t-joint of masonry after removing all the loose and worn-out pointing using hand grinding machine with diamond wheel, chipper (manual /and or mechanical means) at a depth of 2 times width and providing and filling the pointing mortar in the horizontal and vertical joints, applying a priming coat using two componentsolvent free epoxy based bonding agent having bond strength >10 Mpa & viscosity >20 poise inside the joints with a brush and filling properly these joints with repair mortar on the prepared surface and curing with curing compound. The repair mortar of TOP CRETE 80 or equivalent shall be single component which is mixed with water at water powder ratio of 0.11 and shall have drying shrinkage < 300 micro strain as per ASTM C 157-93; compressive strength > 45 Mpa, bond strength >2.1 Mpa, chloride ion content<0.03%, elastic modulus >37 Gpa & flexural strength > 10mpa as per bs 4551, confirming to the requirements of BS EN 1504-03 class R4. The rate shall include the cost of materials, hire charges of necessary equipment, scaffolding / hanging platform, pulley arrangement, etc complete as per the direction of the departmental officers.

Flush Pointing - Providing polymer modified repair mortar for masonry joint filling to a depth of 20 mm including preparing of Flush-joint of masonry after removing all the loose and worn-out pointing using hand grinding machine with diamond wheel, chipper (manual /and or mechanical means) at a depth of 2 times width and providing and filling the pointing mortar in the horizontal and vertical joints, after dried applying a priming coat using two component solvent free epoxy based bonding agent of m/s. Confix India or equivalent having bond strength >10 Mpa & viscosity >20 poise inside the joints with a brush and filling properly these joints with repair mortar on the prepared surface and curing with curing compound. The high abbrasive resistant mortar of Non shrinkage trowelable fibre reinforced thixotropic repair mortar of Top crete 80 of m/s. Confix India or Equivalent shall be three component which is mixed with liquid to liquid: filler ratio of 2.5+0.83+16.67 and confirming to the requirements of BS EN 1504-03 class R4 with all necessary documentation arrangements The rate shall include the cost of materials, hire charges of necessary equipment, pulley etc

Water Proofing - Two Component High Flexible Cementitious Elastomeric Waterproofing, prepare the area for waterproofing treatment by ensuring no presence of dust & other foreign particles. pre wetted the waterproofed area. Applying the waterproofing coating of 2 mm thickness of coverage 3.6 Kg/ sqm, using the material Top Seal 100 or equivalent Elongation >150%, Density 1940 kg/m³, Temperature +5°C to +30°C.

Drilling and reaming of bore of 350 mm diameter using hydraulic type drilling machine fitted with approved diamond core drilling bits, in masonry, plain cement concrete, reinforced cement concrete, boulders and hard rock strata, to the required depth as per site conditions, maintaining true line and plumb at all stages, in congested dam / head works conditions, including mobilisation, transportation, loading, unloading and demobilisation of drilling rig, power pack, pumps, generators, tools, plants and accessories; temporary dismantling, removal, safe stacking, protection and subsequent refixing, alignment, anchoring and commissioning of the existing gantry crane available at site, which interferes with drilling operations, including electrical and mechanical disconnections and reconnections; hire charges of crane / hydra with operator, fuel, maintenance and all incidental handling for dismantling and refixing of the existing gantry crane as well as for handling and shifting of drilling equipment; providing, erecting and dismantling scaffolding, staging, working platforms and safety arrangements wherever required; providing additional supports, base frames, sleepers, anchoring and stabilising arrangements to ensure safe and vibration-free operation of drilling rig; cost of diamond core drilling bits, reaming shells, rods, couplings and consumables, including frequent replacement due to abrasive hard strata; supplying water for drilling operations including pumping, circulation, storage and disposal; labour charges for skilled, semi-skilled and unskilled labour including drill operators, helpers, mechanics, crane operators, welders and safety personnel; hire, running and maintenance charges of drilling rig, crane, pumps, generators and allied machinery including fuel, lubricants and spares; drilling and reaming with periodical checking and correction of verticality and realigning to plumb whenever necessary; continuous removal of slurry, cuttings and debris and thorough cleaning and flushing of bore; providing temporary casing wherever required to prevent collapse; re-drilling and pressure grouting in case of collapse, cavities or failure during drilling, using approved cementitious or chemical grouting materials and methods; and all incidental, ancillary and allied works, safety measures, statutory compliances, insurance, royalties and taxes, complete in all respects as per standard specifications, drawings and directions of the Engineer-in-Charge, with the rate being inclusive of all risks, contingencies and temporary works and no extra payment being admissible on any account whatsoever. Rate is inclusive of temporary dismantling and refixing of existing gantry crane and associated risks involved in drilling in congested dam head works area.

Removing, dismantling, cutting and extracting the existing damaged Mild Steel pipe of 300 mm diameter, which is encased within the already drilled 350 mm diameter bore formed around the pipe, including depth-wise cutting and removal of the pipe at all levels up to a depth of 30 m, by cutting the pipe into suitable lengths using gas cutting or mechanical cutting equipment, loosening and extracting the pipe sections from within the drilled bore under confined and congested conditions; lifting, lowering and handling of cut pipe sections using crane / hydra / chain pulley arrangements in coordination with the drilling works; handling, stacking and disposal of dismantled pipe materials away from the site of work; labour charges for skilled and unskilled labour including gas cutters, fitters, riggers and helpers; hire, running and operating charges of cutting equipment, lifting devices, tools, gas cylinders and consumables; providing necessary temporary supports and protection to the drilled bore and surrounding structures during extraction; removal of debris, sludge and foreign materials released during dismantling; cleaning of bore after complete removal of pipe at all depths; and all incidental, ancillary and allied operations required for safe, controlled and complete removal of the pipe from inside the drilled bore, carried out in continuation of drilling operations, complete in all respects as per standard specifications and as directed by the Engineer-in-Charge, the existing MS pipe is surrounded by 350 mm diameter drilled bore and removal involves depth-wise cutting and extraction at all levels up to 30 m under confined conditions.

Supply and fixing of special oriented PVC (PVC-O) pipe of 300 mm nominal diameter, conforming to relevant international standards such as ISO 16422 / EN 17176 or equivalent approved specification, specially manufactured or procured for the work, having high hoop strength, enhanced impact resistance and long-term hydrostatic strength suitable for pressure and non-pressure applications, including pipe class and pressure rating as approved by the Engineer-in-Charge, with smooth internal bore and corrosion-resistant properties; including cutting the pipe to required lengths, lowering and placing carefully inside the already prepared 350 mm diameter bore, positioning truly to line and alignment; jointing using approved integral socket / coupler system with elastomeric sealing rings or compatible mechanical couplers as per manufacturer’s recommendations; fixing with all necessary couplers, adapters, spacers, end caps and accessories required to achieve correct seating and continuity; labour charges for skilled and unskilled labour including pipe fitters and helpers; use of necessary handling arrangements, tools and tackles to avoid damage during lowering and fixing; ensuring proper clearance, uniform annular gap and correct positioning throughout the depth; testing of joints for alignment and soundness; cleaning of pipe interior after fixing; and all incidental, ancillary and allied operations required for complete installation, recognising the pipe as a special item supplied specifically for this work, complete in all respects as per approved specifications and as directed by the Engineer-in-Charge.

Please Enable Macros to View BoQ information