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| 1 | Supplying of all types of structural steel conforming to Approved Drawing of Railway, fabrication, assembling, erection/ slewing rend launching of Bow String steel girders (requiring traffic block from Railway) of 76.00 M span on sub-structure. complete as per approved drawing incl. metallising as per NOTE (I) below as per IRS-B-1 on all members, (Detailed fabrication and erection drawings & launching methodology will be prepared and got approved by the contractor from Employer or its authorized representative as per case may be.) Rate include fabrication of all the types of battens, bracings, ties, stiffeners, packing, diaphragms, shop rivets / welding, T&F bolts, drifts, shop welds, templates, jigs, fixtures, back up supports, accessories, transporting various components from fabrication shop. to site, including loading, unloading, lift and all taxes complete. Assembly of girders on¬drifts/ bolts, field riveting/welding, assembling of temporary support for side slewing, raising of girders to the bed block level, providing sliding arrangements and slewing the girder in position, lowering of girder on bearings and bed plates. Grouting holes in the bed block for fixing of HD bolts / anchor pins of bedplates, all temporary arrangements. Construction of 2 Lane ROB in lieu of level X-ing No. 75-A at Km. 149/10-11 on Prayagraj-Phaphamau Rail Section between Teliyarganj to Bada Baghada on Salori Sadak Marg in District-Prayagraj (Bow String Steel Girder) 76.00 M |
| 2 | Quoted rates for above shall include. Metallising girder/girder components such across girders, stiffeners, bracing etc. of new steel girder as directed by Engineer with aluminum spray notless than two layers after preparing surface by sand/gritblasting (as per clause3 of IS6586 & appendix A of IS:5905) as per the provisions laid in Appendix VII of IRSB12001 specifications (with latest correction slips) with contractor\"s own material, tools, plants, labour, loading, unloading, transportation, handling, rehandling required if any, including all lead, lift, descents, crossing of tracks/obstructions etc. complete in all respect and asperdirection of Engineer in charge. Aluminum spray used for metallising shall have 99.5% Aluminum composition conforming to IS:2590. Wire methodshall be used for metallising and diameter of wire shall be 3mm or 5mm. Specified thickness of coating shall be applied inmultiple layers and in no case less than two passes of metal spraying shall be made over every part of thesurface.Atleast one layer of coating shall be applied within fourhours of blasting and surface must be completely coated within8hoursof blasting.The nominal thickness of the coating shall be150micron and surface of sprayed coating shall be of uniform texture and free from lumps,coarse areas and loosely adherent particles. Work shall be executed as per provisions of Appendix-Vllof IRS-Bl 2001and provisions contained in chapter 21 of Indian Railway Unified standard specifications. |
| 3 | Supplying, providing, welding of Stud shear connecter (minimum yield stress of 385N/mm2, a minimum tensile strength of 495N/mm2 and a minimum elongation of 15% prior to the cold formation of the head) by stud arc welding method with flange of steel girder as per designed parameters. The studs and the surface to which the studs are welded shall be free from scale and rust, metal spray, grease, oil, paint or other material which would affect the quality of the weld. Stud shear connectors shall conform to property class SDl of BSEN ISO 13918:2008 and shall be subjected to the Ringtest & Bend test asper EN54006. Rate include transporting the material at all height including fixtures, back up supports, accessories, includingloading, unloading, lift and taxes complete.Trained personnel shall carryout the welding of Stud shear connector. Guidelines as per IRSB-1 (latestversion) BSEN ISO 13918:2008 & BS-5400 to be followed. Summary of BSEN ISO 13918:2008 provisions have been enclosed as special specifications. |
| 4 | Supplying, providing, tightening of all types of High strength frictional grip (HSFG) bolts, nuts & washers/D11 washers conforming to IS:4000:1992, IS3757:1985 (reaffirmed 2003), IS6623:2004 & IS6649 having property class 8.8/10.9 as decided by Engineer incharge, diameter preferred / non preferred sizes, length as desired / designed with coating consisting of Zinc phosphate as per IS1367(pt-XII) in all type of steel girder Road/Rail. Rate include tightening of all the types of HSFG bolts at stress level asper IS:4000, at all height including fixtures, back up supports, accessories, transporting to site, including loading, unloading, lift and taxes complete. Trained personnel shall carry out the tightening / installation of HSFG bolts. For HSFG bolts, minimum two washers shall be provided, one DTI & one plain washer.Guidelines as per IRSB-1 (latestversion) & RDSO report no. BS-111 (Revision2) to be followed. Summary of BS 111(Rev2) provisions have been enclosed as special specifications |
| 5 | All Steel Plates used in fabrication of this bridge are of grade Fe 490B/490 Only ISMS 600 is of grade Fe 410 |
