Protective Maintenance works in Chambers 5A and 5B of fore bay in Cooling Water Pump House 2.

Amount

Providing hanging scaffolding for the Fore-bay chamber below ground level using 13 to 15 cm dia. casuarinas props for verticals, horizontals in longitudinal and transverse directions just above water level & supporting horizontal anchors at top at G.L. over the openings and providing platform with C.W. planks of 40mm thick for the entire area in complete form using coir and nails etc complete. The hanging platform and scaffolding to be provided shall be very safe with all safety measures. The rate is inclusive of cost of all materials, labour charges, lead, lift etc complete.

Chipping out the corroded portion or the RCC roof ceiling from the roof slab bottom for an average depth of 50mm and cleaning the surface thoroughly free of all dusts and cleaning the debris away from site

Providing and fixing 75mm x 50mm (3mm thick) weld mesh in the damaged portions of the ceiling portion

Applying one coat of Nitobond AR mixed with cement slurry in the ratio of 1:1 over the concrete surface

Providing RCC 1:1½: 3 using 6 to 10mm chips for 50mm thickness in layers in the ceiling mixed with Nitobond AR in the ratio of 250ml per 50kg of cement including cost of all materials, labour, lead, lift, safety measures etc., complete

Removing the spalled concrete portions over the sides/bottom of beams, thorough cleaning of the surfaces using hard wire brush and providing primer coat of epoxy compound and also providing 10mm thick epoxite epoxy screeding, using quartz sand and epoxy compounds of Hindustan Ciba Geigy make including cost of all materials, labour, lead, lift etc complete

Providing two coats of epoxite epoxy over the roof ceiling surface of RCC slab & walls of Fore bay chamber using epoxy compounds of Hindustan Ciba Geigy make including cost of all materials labour lead, lift etc complete.

A. MURUGAN