including understanding of bridge drawings and RDSO standard drawings B K KUSHWAHA PROFESSORIRICENPUNE Mob 74200 41117 Email brijiricengovin SNo Item 1 Alignment Design ID: 926510
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Preparation of Bridge GAD including understanding of bridge drawings and RDSO standard drawings
B. K. KUSHWAHA
PROFESSOR/IRICEN/PUNE
Mob: 74200 41117, Email: brij@iricen.gov.in
Slide2SNo.Item1.Alignment Design Report 2.L- Section 3.
LWR Plans4.
Design basis report for important bridges
5.
GAD of important bridges6.GAD of major and minor bridges, affecting/ Not affecting the existing bridge7.TAD (Temporary arrangement Drawing)8.Structural drawings of important and major bridges9.Structural drawings of minor bridges10.GADs of ROBs/RUBs 11.Structural Drawings of ROBs/RUBs12.GADs of FOB13.Structural Drawings of FOBs14.Schematic Yard Plans15.Engineering Scale Plans (ESPs)16.Signal Interlocking Plans (SIPs) and Route Control Charts (RCCs)17.Cable Route Plan 18.Building Plans19.Drainage Plans20.Protection Work Design and Drawings
DRAWINGS FOR EXECUTION OF A PROJECT
Slide3PLANNING FOR CONSTRUCTION OF BRIDGES (Ref: Bridge manual) Investigation for Minor & Major BridgesInvestigation for Important BridgesTechno economic Feasibility StudySurvey of Rivers in connection with the location of an important bridgeHydrological InvestigationPlan and Cross Section of RiversFactors governing the choice of site Design discharge (Q) & Design discharge for foundations (Qf)Design of waterwaysVertical Clearance & Free Board (F)Standard of substructure for new railway linesFinal Project Report in case of important BridgesChoice of foundations for bridges Approval of drawings for new lines, doublings & Gauge conversion
Slide4GENERAL ARRANGEMENT DRAWING (GAD)of BRIDGERef: Checklist for preparation of GAD of Railway Bridges. RDSO letter No. CBS/DBR/IMP/Policy Dated: 02.11.2017
Slide5A- GENERAL (To be written on right bottom corner)Name of the work — to be mentioned correctly i.e. Name of Railway, Division, Project, Work with location, name of consultant etc.Drawing number - to be mentioned correctly.Scale- to be mentioned correctly, size of drawing to be not less than Al, on tracing paper (to be converted to tracing cloth after execution).Name &s Signatures - The name and signature of all officials involved in preparation of GAD to be written clearly and to be signed with date. For construction organization works, name and signature of Divisional officers also. Provision to be made for signature of Head Quarter officials.Reference — Reference of PB / others Item no. with name of sanctioned work to be mentioned clearly.Alteration — Alteration should be clearly mentioned With the name and signature with date of the officials concerned.
Slide62 NOTES- (To be written on the right side of plan) The following items to be covered in the Notes on the GAD Plan:Dimensions- To be written clearly (preferably in mm and levels in meter). The font size should be reasonably big and easily readable.Colour- The color of existing work and proposed work to be indicated.Scaling and Direction- No scaling, only written dimensions, North direction to be shown.Shown to scale- Plan, section and elevation to be as per scale and scale to be mentioned.
Slide7Direction to Field Engineers- Directions to Field Engineers before execution should be mentioned clearly i.e. verification of various levels including rail level, formation level, HFL, max observed scour level on upstream, foundation level, bore log data, type of soil, bearing capacity etc. Clear directions in case there is apprehension of damage to nearby structures etc.Co-ordination — Clear direction to executive department to consult / intimate to other concerned departments.
Slide8Traffic diversion- In case of traffic diversion during execution, the same to be mentioned with details like chainage of takeoff points on both the ends etc.Speed restriction- Clear mention of speed restrictions to be followed before / during / after the execution.Reference Drawings- The drawings to be referred for detailing to be mentioned clearly.
Slide9Miscellaneous details- Miscellaneous details like skin reinforcement, no plastering/ cement wash, dry stone pitching, Weep holes, backfill, inspection platforrn, pedestal, trolley refuges, OHE mast, safety measures, service cables, launching scheme, protective coating to reinforcement & concrete, station names with their MSL, railway boundary, modus-operandi etc. to be mentioned in the notes itself. Codes and Specifications- Reference of Railway codes, bridge rules, IS codes, IRC codes with their preferential order and specifications to be followed, should be clearly mentioned.
Slide10Technical details- All technical data used for reference in preparation of GAD to be Written in a tabular form like- latitude / longitude, track on single/ double line, bridge on UP line or DN line, grade, rail level, formation level on approaches, HFL, LWL, bed level, free board, vertical clearance, linear water-way, standard of loading
, type of super—structure
, type of bearing,
type of sub- structure, type of foundation, design discharge, catchment area, sub-zone for water-way calculation, seismic zone, wind zone, exposure condition, clear cover to reinforcement, provision of guard rails, track on straight or on curve, any RAT/ RAW within 50km on upstream, cross slope, name of river/ stream etc. All reduced levels to be mentioned w.r.t. MSL.
Slide11Details of existing bridge- Details of existing rail bridge / road bridge to be Written in a tabular form i.e. existing bridge no., location, span, type of sub- structure / foundation, distance from existing bridge, rail level, formation level & foundation level, water—way and critical levels, any major incident happened to these bridges in past, etc.,
Slide12The details of location with chainage, reduced level at top of trial pit/ bore log, SBC value for each stratum to be shown in a tabular form.Foundation pressure and safe bearing capacitySoil classification IS:1498Details of trial pit /bore log
Slide133- Instructions to be followed in preparation of GAD
Slide14Whether proposed work is as per sanction or is there any deviation from sanction. In case of deviation, the details there of. - Pink Book / Other sanctionWhether GAD satisfies latest approved SOD.Relevant & up to date IRS and IRC codes followed with their order of preference to be written. (Various codes manuals, specifications, etc.)Whether L section is approved by open line? If so, whether bridge details verified from L-section. (Copy of approved plan to be submitted). If not, the reasons there of. (ref: Board’s letter no. 98 / W-1/General/O/30 dated 10.06.2008)Whether hydrological investigation has been carried out. A report to be submitted. If not, the reasons there of. (Clause 4.1 of Appendix-1 of sub-structure code)
Slide15Super-structure:Whether RDSO standard drawing is followed. If so, whether all the dimensions are as per RDSO standard drawing. (Board’s letter No. 20 1 3 / C-111 /BR/ RDSO / Misc. dated 11-8-2014)If not, approval from PCE/CAO obtained with proper justification.For selecting the type of super- structure, whether Board’s guidelines followed. If not, whether Board’s approval has been taken. (Board’s letter No. 2005/CE-I / BR-II / 8 dated28.05.2009)
Slide16Selection of span-Whether most economical option has been considered. Proper and adequate justification for selection of span to be mentioned.Whether overall length is more than existing bridge /water course. If so, the reasons there of.Whether overall length is less than existing bridge / water course. If so, the reasons there of.
Slide17Whether design discharge has been calculated / provided as per code. Whether discharge due to RAT/ RAW in upstream has also been taken into account. (Clause-4.2 of sub-structure code)Whether free board and vertical clearance have been provided as per code. (Clause 4.8 and 4.9 of sub-structure code)Whether proposed water way has been provided as per code. (Clause - 4.5 of sub-structure code) Whether maximum scour depth below HFL at pier and abutment has been considered as per code. (Clause - 4.6 of substructure code)Whether size of pier / abutment cap has been provided as per code including inspection arrangements. (Clause -7 of sub-structure code)
Slide18Foundation-Whether safe bearing capacity has been calculated by suitable method. (Clause 6.3.1 of IRS Bridge substructure code)Whether open foundation has been adopted. (Clause 6.2.2 of IRS Bridge sub- structure code)If not, approval of CBE/ SAG officer has been obtained. (Board’s letter No. 20 14/ CE-III / BR / Bridge Policy dated 15-11-2016)In case of pile foundation, pile cap level and foundation level has been calculated / provided as per codes. (IS 2911, IR Manual)In case of well foundation, provisions including scour depth has been calculated / provided as per codes (IRC-78, 2014 81, IRS Bridge sub- structure code)Whether distance between existing and proposed bridge has been adequately provided.Whether location of proposed piers and abutments are in the line of existing bridge. If not, the reasons there of.
Slide19Whether GAD has been prepared with half plan at top and half plan at bottom with longitudinal section, sectional elevation and key plan.Whether the dimensions of plan, elevation, cross-section, longitudinal section are matching.Whether wing walls with cross-section, with dotted lines in elevation as per standard drawing have been provided. If not, the reasons for deviation.
Slide20Whether backfill material behind abutments, wing walls, RCC boxes etc. have been shown.(Clause 7 . 5 of IRS sub- structure code)Whether weep holes have been provided adequately. (Clause 7.6 of IRS sub-structure code)Whether flooring details with curtain wall / drop wall / apron have been shown with cross- section in case of box bridges. (SP: 13,IRC code)
Slide21Whether bearings have been provided as per requirement and details shown correctly. (BS-102, Guidelines on inspection & maintenance of bearings)Whether proper facilities for inspection like inspection ladder, steps, inspection platform have been provided. If not the reasons there of.(a) Whether trolley refuges have been provided as per guidelines. (Para no. 220 of IRPWM)Whether man refuges have been provided. (RDSO drawing no. CBS-0028 for open web bridges and para 220 of IRPWM)
Slide22Whether reference of separate drawings like protection work, pitching etc. has been mentioned at adequate place. Whether direction of flow has been confirmed from site and shown correctly in the plan. Whether river training Works required. If so, these have been provided as per bridge manual. (Chapter 8 of bridge manual)
Slide23RDSO standard drawingsMaster List of Drawings of Bridges & Structures Directorate, RDSO.BS-28(Revision 21, version 1.7)MAY 2017http://10.100.2.4/drawing/frmLink.aspxRDSO--10.100.2.19
Slide24Slide25INDEX OF BS- 28
Slide26Slide27Thanks