MRVC to conduct Orthophoto/Photogrammetry Survey (Drone Survey) for Quadrupling of Virar–Dahanu Section

MUMBAI: Mumbai Railway Vikas Corporation Limited (MRVC) which is a Public Sector Unit of Government of India under Ministry of Railways invited sealed quotations on single stage one packet system from the short listed consultants for the work of “Orthophoto/Photogrammetry Survey (Drone Survey) of Proposed Alignment of Quadrupling of Virar–Dahanu Road Section in Mumbai Division of Western Railway.” MRVC has been vested with the responsibility of implementing this Project.

For the proposed work, the agencies should familiarize themselves with local conditions and take them into account in preparing their Proposals and to obtain first-hand information on the assignment and local conditions, Consultants are also encouraged to visit the project sites.

MRVC is constructing 3rd & 4th Railway line between Virar Station (Km. 59.98) & Dahanu Road Station (Km. 123.78) parallel to existing Railway corridor in MUTP-3. Proposed additional tracks will be laid on east side of existing corridor up to KM. 65/28 and thereafter new tracks will be laid on west side of existing corridor up to Km. 117/15. Thereafter, new track will be laid on the existing alignment by dismantling the existing track up to Km. 120/20 and from Km. 120/20, it will be laid on the east side of existing corridor.

The details of the project are as under:

  1. The total length of the survey is approx. 68 Kms.
  2. The survey needs to capture 50 meters of land on each side of the existing Railway track.
  3. Agench will have to obtain necessary permissions through MRVC .
  4. The proposed lines may come up on the left side of the track towards West direction.
  5. On the Right side of the track (east), DFC Corridor has been built currently.
  6. MRVC intends to have the Video Files, Auto CAD Drawings.
  7. For the survey beyond 50 meters, the MRVC will be additional cost.
  8. MRVC will provide the As Built drawings of the existing Tracks.
  9. The primary survey Auto CAD Drawings will also be provided by MRVC for optimization of the cost.
  10. The proposed plan also intends to introduce eight new Railway stations and hence Agency need to capture the proposed Stations Layout diagrams for the new areas which include the Railway Platform, station Buildings and the Yards at both ends i.e. called as Outers of the Stations in Railways angle.
  11. As per the estimates the current ridership between these two stations is 1.3 lakh which is estimated to touch to 4.00 lakh by 2021, and to 12 lakh by the year 2041 once the decongestion through the new Railway lines are in place.
  12. This corridor also has large and medium-scale industries and the Railway lines beyond Virar have reached their capacity.

Survey of the proposed alignment is completed by MRVC by actual field survey with total station survey equipment. Accordingly, proposed alignment of the tracks of 3rd & 4th line of track has been finalized. It is now proposed to conduct Unmanned Aerial System (UAS) commonly known as Drone survey for Photogrammetric 3D mapping of proposed alignment of the Quadrupling of Virar – Dahanu Road project under this survey work.

The broad scope of work involves topographic survey and preparation of Existing Land-Use (ELU) & Land-Cover (ELC) / topographic maps of rail alignment corridor (existing / proposed) between Virar Station (Km. 59.98) & Dahanu Road Station (Km. 123.78) of Mumbai Division of Western Railway (Total length 64 km and corridor width approximately 60m) using high-precision Drone/ UAV (Unmanned Aerial Vehicle Image/Photogrammetric approach) technology.

MRVC will provide proposed area of interest corridor in the form of Google File (*.kml/*.kmz) or *.shp file to understand the geographic terrain of the area. It is the responsibility of the surveyor to obtain necessary permissions from the all concerned authorities. MRVC will provide necessary letters for the same. The primary tasks to be accomplished during the topographical survey/ mapping includes:-

  1. Topographic Surveys along the existing or new alignment corridor & Right of Way (RoW)
  2. Collection of High Resolution Aerial Imagery of minimum approx. 3 to 5 cm GSD by Drone/UAV, performing Aerial triangulation, Digital Terrain Modelling, 3D topographical mapping & High Resolution Geo-Referenced Ortho-rectified Orthophoto mosaic generation for collection of the details of all existing assets including Picking up of natural and manmade features covering the entire corridor
  3. Topo and Contour maps
  4. Digital Terrain Model (DTM)
  5. Collection of details for all features above the surface and visible in UAV data or Image, from the surveyed data such as:-
a)    Structures, Bridges, culverts.
b)    Utilities, Electric and telephone installations
c)     Existing roads
d)    Existing Railway tracks
e)    Railway platforms and other service buildings
f)      Electric sub stations and SSPs.
g)    Railway Yards (Platform Deck, Sheds etc.)
h)    Railway Workshops
i)      Signage and Signals
j)      Huts, Buildings, Fencing
k)     Trees (with girth greater than 0.3metre)
l)      Oil and gas lines (above the surface and visible in LiDAR data)
m)   Manholes
n)    Vegetation
o)    Fences, Walls, Retaining Walls
p)    Culvert, Headwalls, Pipes
q)    All Types of Buildings, Tanks
  1. Bridges and Culverts: Collection of Major/Minor Bridges/ Culverts data with parapets, Returns, Substructure and Superstructure details. Cross Sections of streams/rivers shall be collected up to 200 m length on upstream and down stream side.
  2. GPS Data Acquisition: Establishing of Ground Control Network for Drone/UAV Survey: Identification and marking of Ground Control Points on the area of Interest. Minimum number of GCP shall be as per project requirement/ industry standard. Monumentation of G.C.P.: Required number of ground control points shall be marked on the ground using DGPS method at regular/random interval throughout the project area. Control chart shall be prepared choosing Ground Control Points with easy access as well as easy identification on image. Control points shall be established on ground based on the control chart preferably on permanent structure, culvert corner, Road barrier, bridge corner, rock-in-situ, field bunds and other definable points like tri-junctions, road-junctions.
  3. Aerial Data Acquisition:
    • Aerial images (using UAV) need to be taken maintaining a GSD (Ground Sample Distance) GSD of ~3cm to ~5cm per pixel resolution or better.
    • Stereographic images with minimum 60% forward and 30% side overlap
    • Photographic Condition: Free from fog / snow / haze / dust / smoke /sun angle etc.
  4. Longitudinal and Cross Section:
    • Longitudinal section levels along final centre line shall be taken at every 25 m interval, at the locations of curve points, small streams, and intersections and at the locations of change in elevation.
    • Cross sections shall be taken at every 50m interval in full extent of survey corridor. Cross sections shall be taken at closer interval at curves.
    • Contour mapping – 0.5m Interval Contour Data with Spot elevations
  5. Quantity Calculation: Working out quantity of earthwork for the proposed double lines based on drone survey and proposed alignment, track centre and formation levels etc. as per project sheets.
  6. Details of Photogrammetric 3D mapping under the scope of this survey,
a)    Photography Details
                              i.        20 Mega Pixel camera professional Multirotor Drone
                             ii.        Flying Height 60m from take off point
                            iii.        Area Capture at 60M height is approx capture is about 60M width on ground
                            iv.        Coordinate System – UTM Zone 43 N
b)    DGPS Survey
                              i.        DGPS Ground Control Points at every 250m
  1. Deliverables – Digital Delivery
a)    Aerial Photos in JPG format. Provide high resolution and high accuracy images which can be used for accurate measurement of distances and area.
b)    Asset Mapping of existing alignment
c)     2007 Autocad DWG files with all the Vector data with contour details/mapping
d)    PDF files (Vector and Orthophotos)
e)    Georeferrenced .TIF format color Orthophotos – 2cm GSD
f)      DGPS Ground Control Coordinates in TEXT format
g)    Producing drawing file by digitizing orthophoto
h)    Raw 4K quality Videos with Geo Tagged files
i)      Merged seamless Geo-tagged Video of 1920 x 1080 format (Full HD) resolution with all annotations
j)      Low resolution VIDEO for on-line viewing in 640×480 format (SD)

STANDARD OF CONSTRUCTION

SNo Description Provisions
        I. Standard of Construction Group-“C” suitable for operation of 25T axle load trains.
      II. Gauge 1676 mm BG
     III. Track structure 60Kg/90 UTS new rails in mainline and 52 Kg S/H rails in loop lines and sidings.
     IV. Sleeper 60 kg PSC sleepers of existing design.
      V. Sleeper density 1660 sleepers per km in main line and 1540 sleepers per km in loop line.
     VI. Ballast cushion Mainline -350 mm., Loop lines-250 mm.
   VII. Welding of rails As far as possible, CWR/LWR to be provided on main line and LWR/SWR on loop lines.
  VIII. Points & Crossings 60 kg. 1 in 12 curved switches on PSC layout negotiated by passenger trains & 60 kg. 1 in 8 ½ curved switches on PSC layout negotiated by goods trains.
     IX. Formation 1. Blanket of adequate depth to be provided depending on the sub-grade proposed, as per IRS specification.

2. Ground improvement measures, as required for the clayee formation/marshy land as also protective measures for ensuring safety in cutting must be incorporated.

      X. Maximum degree of curvature 4 Degree is existing in running double line BG route. Reduction in curvature to be examined wherever possible.
     XI. Ruling gradient 1 in 150 fully compensated gradient.
   XII. Gradient in yard  1 in 1200 desirable subject to maximum of 1 in 400 depending upon the available gradient in existing yard. Attempts are to be made to adopt flatter grade.
  XIII. Length of stabling line/loop Stabling lines of 330 m (15 Car length) for proposed 3rd line & 4th line and loop lines of full CSR of 750 m or as directed by the Engineer-in-Charge.
  XIV. Track centres Track centres between existing BG line & the proposed 3rd line shall be 7.8 m and 5.3 m between 3rd and 4th line. Required modification in yard may be done to comply requirement of S&T, OHE etc.
   XV. Maximum grade on approach to main river bridges As per existing Gradient of double line BG track or as directed by Engineer-in-charge.
  XVI. Level crossing For 3rd line existing LCs will be retained while for 4th line it is proposed to convert all the 16 (approx.) level crossings into ROBs/RUBs. The detailed survey for eliminating these 16 (approximate) level crossings by provision of ROBs/RUBs/Subways including approaches, involving land acquisition/structures etc. to be made to arrive at the realistic cost of the elimination of LCs and also to prepare GADs.
XVII. Width of formation: Both in cutting & banking As per latest guidelines issued by Rly. Board/ RDSO as on the date of award of work.
XVIII. Land In most stretch Railway land is available to the extent required, however, additional land is to be acquired in some stretches for 3rd line and to be assessed for 4th line, scheme/proposal for the same is to be given. Approximate land to be acquired for 3rd line as per DPR are given in Annexure IX.
  XIX. Speed 110 Km/h (Possibility to be explored for providing speed potential of 160 km/hr)
   XX. TYPE OF LOADING 25 Tonne – 2008 loading
  XXI. The entire work shall be carried out as per the provisions of Indian Railways Code for the Engineering Department (Third Reprint, Year 1999 with up to date correction slips) in general and in particular as per Chapter No II and IV except as specified in the Proposal document.
XXII. Curves: Sharpest degree of existing curve in the case of horizontal curves in BG section is 40, However, the reduction in degree of curves is to be examined. Details and abstract of curves is given in Annexure-VII. Vertical curves shall be provided where the algebraic difference between the grades is equal to or more than 4mm per meter. The minimum radius of the vertical curves shall be 2500m.
XXIII. Bridges: All bridges shall conform to 25T standard of loading. Before designing the bridges, detailed seismic, hydrographic and Geo-tech studies are to be done. All the major and minor bridges and RUBs are to extend making planning for each bridge to comply requirements. A list of existing bridges is given in Annexure-II.
XXIV. Tunnels: Nil
XXV. Permanent Way: Permanent way in this project will be of 60Kg new rail (LWR/CWR) with PSC sleepers 1660 density over 350mm ballast cushion for main line and 52Kg S/H rails (LWR/SWR) with PSC sleepers 1540 density over 250 mm cushion for running loops.
XXVI. Fixed Standard Clearance: Clearance to fixed structure shall be provided as per Indian Railway’s schedule of dimensions (IR-SOD) with latest amendments till the date of award of contract
XXVII. Level Crossing: NIL
XXVIII. Seismic Zone Project line falls in seismic Zone-III & IV
XXIX. Acquisition of land: Land acquisition to be kept to minimum as possible.
XXX. Formation: The top width of proposed 5TH & 6TH Line bank shall normally be 13.15 m with 2(H):1(V) side slopes (or as per latest RDSO guidelines).
XXXI. Datum levels and Bench Marks: The datum of all levels shall be the mean sea level (MSL) as adopted for Great Trigonometrical Survey of India. Therefore, all levelling operations shall be with reference to GTS bench marks and shall be connected to the GTS Bench Marks available in the neighbourhood of the proposed alignment. Bench marks shall be given/established at all important locations like bridge sites, plinth of station buildings, erecting post etc, in any case, at intervals not exceeding 1 Km.
XXXII. Compass Bearing: The compass bearings of each straight shall be taken at either end and the mean of the readings at the two ends shall be recorded as average bearing of each line and furnished along with the survey report.
XXXIII. Right of MRVC to modify the terms of reference during the course of execution of this work: The terms of reference given above are tentative and MRVC reserves the right to modify any of the same and also include any new terms of reference for locating the most optimal and economical alignment for the stretches where it is proposed to deviate from the existing alignment.
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