tender for civil work - rcc benches-providing and placing of rcc benches in sector-15, sector-18, sector-19 and sector-13 extn.rohini in ward 54 / m-i rz., dsr 2018 and approved items ; 110.20:providing and fixing of precast rcc chair bench with arm rest each bench consists of 2 no, l-shaped base support in grey cement colour ( thickness 80 mm x90 mm, 890 mm back height; 450 mm front height with base width 690 mm ) and 1 no. reinforced concrete plank in red colour of size 1500 mm x 400 mm x 50 mm and 1 no. of reinforced concrete plank in red colour of size 1500 x 425 mm x 50 mm total height of the bench 890 mm manufactured using cement concrete 1:1.5:3 ( 1cement: 1.5 coarse sand : 3 stone aggregate 12.5 mm nominal size ) using vibro compaction process reinforced suitably to promote long use and to prevent damage during handling. transportation & erection, all parts are joined together with galvanised nuts and bolts of suitable size and all bolts are sealed after assemebly, bench top and back planks are treated with special anti-corrosive water proof coating so as to make surface glossy and water proof and as per direction of engineer-in-charge.