Name of Work: FIXING OF DECK SHEET ATGypsum Dewatering Building, ACW-ECW Shed, Ball Mill cum Day Silo and LTP-1 AT NTPC KORBA FGD SITE, DISTT-KORBA, PIN -495450, CHHATTISGARH
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Item Description
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Fixing of permanently color coated galvanised MS troughed metal sheet decking plate of approved colour over floor beams for cast-in-situ roof slab as per relevant IS code and Grade as per NTPC specification. Deck Sheet shall serve as permanent shuttering to the roof slab 150mm thick measured over crest of metal decking & shall have adequate strength to support weight of green concrete and imposed loads during construction between beams as per manufacturer\"s recommendations/ calculations/ test certificates for approval including fixing of plates to beams, side lapping, end lapping etc. all complete for spans up to 2500mm. The Sheet shall be colour coated with total coating thickness of at least 40 microns (nominal) comprising of silicon modified polyester (SMP with silicon content of 30% to 50%) paint or Super Polyester paint, of minimum 20 microns (nominal) dry film thickness (DFT) on external face over primer coat of minimum 5 microns (nominal) and minimum 10 microns (nominal) SMP or super polyester paint over primer coat of minimum 5 microns (nominal) on internal face. SMP and Super polyester paint systems shall be of industrial finish of product type 4 of AS/NZ2728, including fixing of sheet to top flange of beam with drawn arc welding of headed shear anchor studs @ 500mm c/c in the trough and stich screws between two adjacent sheets and sealing with epoxy sealant. The shear anchor studs shall confirm to type B studs specified in AWS D1.1/D1.1M or equivalent as shear connector of 19 mm dia & 100 mm length manufactured from cold drawn round steel bars confirming to ASTM A 29 of grade designation 1010 through 1020 of standard quality with either semi killed or killed welded by drawn arc stud welding through metal deck sheet. Measurement of profile sheeting shall be of the plan area of roof covered by MS trough metal decking. The SMP and polyster paint shall confirm to product type 4 as per AS/NZS 2728. (Deck shall be issued by BHEL stores, shifting of deck sheet from BHEL store to site is in agency scope, procurement of shear anchor studs as per specification is in agency scope)a) Span upto 1800mm
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