tender for supply & construction of precast ug or living bunker; 1 supply and construction of precast ug or living bunker 2 the wk consists of supply and construction of machine made precast rcc culvert framed structure m-40 ( design mix ) precast ug or living bunker of size size17.00 m x 3.60 m ( minimum outer to outer of external wall dimensions ) , min ht 3200 mm fl to bottom of roof slab with thickness of min 200mm and 3200mm inner to inner wall dimension. insulation shall be factored by providing puff panel over precast rcc wall and roof on internal sides. puf shall be 60 mm thick with density 42 kg / cum. excavation will be carried out in any type of strata of size 17.00m x 3.60m and 2.7 m in depth from gl. the qty and specification of different components of the ug or living bunker and the ancillary items are listed from para 2 to 27 as per technical specification attached at rfp.