Welcome to B&S Directorate
Role of the Directorate
Main role of Bridge and Structures directorate is to issue standard drawings for use across Indian Railways. Standard drawings of Railway Bridges (Steel, Composite, PSC and RCC), Road Over Bridges (Composite and Bow String), Foot Over Bridges, Steel bridge sleepers etc. are issued. Formulation and updation of codes, manuals & guidelines on various aspects related to bridge loading, design, planning, construction etc. is another important work of this directorate. Clearance of Design Basis Report of Metros and Non-standard important railway bridges is also done. Vetting of Speed Certificates for different rolling stocks for bridge point of view is done for facilitating trial and operation of new rolling stocks. Development & adoption of new technology for bridges on Indian Railways is done for induction of new technology. Registration of vendors for Steel girder fabrication, elastomeric bearings, POT-PTFE bearings, expansion joints and HSFG bolting assemblies is done for quality assurance during fabrication of bridges. Fabrication inspection of newly fabricated steel bridge girders where RDSO is engaged as an inspecting agency by Zonal Railways is done to ensure quality fabrication of these steel girders. Rail Structure Interaction (RSI) analysis for ballasted deck bridges for Zonal Railways is done for continuation of LWR/CWR over such bridges. NDT Testing and instrumentation is conducted on bridges referred by Zonal Railways. Bridge and Structures Standard Committee Meetings are conducted for discussion and finalization of various technical issues related to bridges over Indian Railways. Development of new loading standards and dealing issues related to floods. Bridge related Consultancy services to Zonal Railways is also one of the major task.
Organizational Chart
Brief Achievements of the Directorate during last one year and current year till September 2021
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Design & drawing of Road over bridge bow string steel girder 72.0m and 60.0m clear span for NHAI three lane one way (with special class loading of 385 ton) for seismic zone – V issued.
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Design and drawing for Abutment, Abutment Cap, Pier, Pier Cap, Piles, Pile Cap for 2 abutments & 6 piers and pedestal of pier 6 of Bridge No. 22 of Dedicated Test Track at NWR issued in 2020.
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Design and drawing for Abutment, Abutment Cap, Piles, Pile Cap issued for both abutments Bridge No. 6 of Dedicated Test Track at NWR in 2020.
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Adoption of Stainless Steel as structural material in corrosion prone areas on trial basis. Design and Drawing of SS FOB for two span ranges for use in corrosion prone areas on trial basis.
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Guidelines for checking of non-standard composite girder ROBs to empower Zonal Railways for its approval.
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Vetting of 217 speed certificates of new rolling stocks from bridge point of view and examination of 52 trial reports.
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Approval of 59 vendors of girder bridge fabrication, bearings, expansion joints and HSFG bolts.
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Guidelines for 4D (BrIM) based Inspection of Indian Railway Bridges Using 3D Bridge Information Model and Unmanned Aerial System (Drone) issued in June 2021.
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RDSO Guidelines for Fabrication Inspection of RDSO Standards Spans-Composite I-Section Steel Girders for Road Over Bridges (ROBs) issued in June 2021.
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Revision of 03 spans of composite girder drawings of Railway Bridges as per IRS Seismic Code, Revised (2020) completed.
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Revision of guidelines for carrying out load deflection test of plate, open web & composite girders (BS-128 R1) completed.
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A&C Slip no. 1 to Report No. BS-121 on Guidelines for Provisions of OHE mast for Electrification at New and Existing Bridge Pier/Abutment has been issued in 2020. This process simplification will enable Zonal Railways to decide implantation of OHE Mast on bridge piers based on IRSOD instead of prescribed values. It will help in faster execution of electrification projects.
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Salient steps for checking existing masonry and concrete substructures for introduction of new types of locomotives, rolling stocks and new train composition or for gauge conversion circulated to Zonal Railways.
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Codal provisions related to consideration of skin friction in pile foundations have been reviewed: Addendum & Corrigendum slip No.10 to IRS Bridge Sub-Structures and Foundation Code regarding modification of clause 6.9.2 has been issued in August 2021 based on the deliberations in 17th EOM BSC in June 2021. This will help to field construction Engineers in designing & executing pile foundation over Indian Railways.
Current Assignment in hand
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Standardization of Bow String ROB drawings with NHAI.
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Research Project with CSIR-SERC on “Evaluation and management of longitudinal forces on substructure of Railway Bridges”
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Upgradation of B&S Lab.
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Revision of composite girder and plate girder drawings of Railway Bridges as per IRS Seismic Code, Revised (2020).
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Detailed checking of all standard drawings of Concrete girders including bearings /slabs for 25t loading.
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Guideline for repair of concrete and masonry structures.
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Preparation of Appreciation Report for field trials of Continuous Scour Monitoring of Bridge Foundation.
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Review of checklist for preparation of GAD of Railway Bridges.
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Review of Guidelines of RDSO approval of Planning and DBR for Important Bridges (Report No. BS-122).
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Checking of adequacy of bearings of older loading standard bridge girder drawings i.e. BGML, RBG and MBG, for enhanced load at increased speed.
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Design of pedestals of Br 22 for Test Track project.
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Scrutiny of Design Basis Report of Vasai Creek Bridge of WR.
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Design and drawing work of 30m span composite deck type Stainless Steel ROB for trial purpose in CR and WR areas.
