Northern Railway Tender

Chapter-4 Bridge Works-Super Structure (Steel) 5

Chapter-5 Bridge Works-Misc. 6

Chapter-6 Masonry Work 2

Chapter-13 Finishing 3

Chapter 15 Dismantling and Demolishing 4

Chapter 26 New Technologies and Materials 6

Chapter-4 Concrete Work 7

Design, supply and fixing all types of Spherical Bearing of capacity more than 300MT capacity in position true to line and level consisting of set of concave and convex mating steel backing plate with a low friction sliding interface, flat sliding elements ,guides and restraining rings; with all components conforming to approved drawing and technical specifications & Bridge Code including grouting of holes for anchor bolts and underside of base plate with approved non-shrink epoxy grout with all material, labour, T&P as a complete job.Note: Sliding surface with PTFE or UHMWPE low friction thermoplastic material and steel for backing plate of Mild steel in accordance to IS:2062 grade-B. Cast steel in accordance with IS 1030 Grade 280-520W. Stain less steel in accordance with AISI 304/316.Low friction thermo -plastic sliding PTFE material either pure polytetrafluroethalyne (PTFE) Or Ultra High Molecular weight Polyethylene (UHMWPE). Austanitic steel is of stainless steel for the sliding interface shall be in accordance with AISI 316L or O2 Cr17 NI12 of IS-6911. The thickness of the stain less steel sheet shall be 3mm minimum. The stainless steel sheet shall be attached to its backing plate either by screwing/riveting or by continuous fillet weld. Hard chromium plated surface shall be entire curved surface of the convex steel plate mating with hard chromium plated concave sliding surface .The thickness of the hard chromium plating shall be at least 100 microns and the final surface roughness of the plated surface shall not exceed 3 microns. Bearing manufacturer shall give the guarantee for satisfactory performance of bearing for period specified. Note :- The rate should also include (i) Preparation of maintenance manual, replacement procedure etc. for the spherical bearing supplied. (ii) Indemnity Bond/Insurance of bearing in favour of N.Rly shall be done for service life of the bearing (30 years). (iii) Complete maintenance for two years after completion of bridge. (iv) The Inspection and Quality control will be done by Railways itself or got done through RDSO/N/RITES or any other agency approved from Railways. (v) The rate is inclusive of supply of approved quality epoxy grouting of holding down bolts/pins of bearing. Nothing extra shall be paid for compliance of this item. (vi) Payment shall be made on the basis of ULS load capacity of each bearing per MT.