Rail Vikas Nigam Limited (RVNL), has invited bids under single stage two packet system for the work of ‘ Construction of 01 No. Limited Height Subway (LHS) by pushing method in replacement of existing level crossing (No.14C/2E at Km 17/953.5 ) along with approaches and other ancillary works at Jatdumri in between Punpun-Potahi Station on Patna Gaya Section under Danapur Division, East Central Railway, Bihar.
- Tender Reference Number: 2021/RVNL/PNBE/JTDM-DAWN/LHS
- Approx. Estimated Cost of Project: INR 11.47 Crores
- Bid Security: INR 22.94 Lakh
- Period of Completion: 06 Months
- Document Download / Sale Start Date: 06-Aug-2021
- Document Download / Sale End Date: 04-Sep-2021
- Bid Submission Start Date: 19-Aug-2021
- Bid Submission End Date: 04-Sep-2021
- Bid Opening Date: 04-Sep-2021
About the project:
- This work pertains to:
- Design, Drawing, proof checking and approval of drawings.
- Casting and placements of 01 No. of LHS using box pushing techniques.
- Approach Road.
- Retaining wall and covered shed on approaches.
- Drainage arrangements.
- Other associated ancillary works.
- This work is a part of under construction Neora-Daniawan New BG line and this line is crossing at existing jat dumri Halt.
- LC no 14C/2E is there between Punpun and Potahi which is required to be shifted from this location to 175.044 Meter towards Punpun station in the form of LHS (Limited Height Subway).
- Punpun and Potahi is coming on Patna Gaya section under Danapur division of ECR.
Scope of Work:
Introduction of contract packages:
The tendered work is part of the project New BG Line from Jatdumri – Daniawan in Danapur Division under East Central Railway in Patna District of Bihar. Jatdumri Daniawan is a part of Neora – Daniawan new line. Daniawan is existing railway station of Fatuha – Islampur section and Jatdumri is existing railway station of Patna – Gaya section. The works is located on the alignment between Punpun-Potahi as well as Jatdumri-Daniawan at Jatdumri Station.
Track Laying & Linking
- 60 Kg/90UTS rails on PSC sleepers with density of 1660 sleepers per km with 350 mm ballast cushion shall be provided for the main line. In station yards, for the loop lines, 52 Kg rails on PSC sleepers with density of 1660 sleepers/Km with 350 mm ballast cushion have been proposed. The main line is proposed to be provided with LWR / CWR. Loop line is shall be provided with SWP/ LWR.
- Yards will be track circuited. Glued joints shall be provided wherever required. 60 Kg points and crossings on PSC fan shaped lay outs have been proposed.
- Hard Stone ballast of 65 mm size with 350 mm cushion on the main line and the turnouts and 350 mm cushion on loops and sidings shall be provided.
- The work also involves slewing / regrading of existing tracks and relaying / dismantling of P-way and Points & crossings, wherever necessary.
- After the formation is ready and cleared by the Engineer for track linking the rails (Single Rails/3 Rail Panels) shall be unloaded on the formation.
- Flash butt welding shall be done to convert the single rails into LWR/CWR as per plan approved by RVNL by contractor’s portable road trailer mounted flash butt welding machine. If there is delay in formation being ready, single rails can be converted into 3/4 Rail Panels in depots and then these 3/4 Rail Panels can be converted into LWR/CWR after transferring them to formation.
- PSC sleepers shall be transported by road and stacked near level crossings.
- The required quantity of ballast to the maximum extent (not less than 2 Cum per meter length) shall be brought by contractor’s dumpers on the formation and spread on the proposed alignment by contractor’s grader. The grader should spread and level the ballast in a width of 3.2 meter (Bottom) and cushion of 200 mm. The remaining quantity of ballast shall remain on the common cess of existing/proposed track, leaving clear space for linking of auxiliary track.
- After laying of ballast is completed in a particular stretch between level crossings then auxiliary track shall be laid at a gauge of 3400 mm with centre line matching the proposed track.
- Now the sleepers shall be lifted from the stacks near the level crossings with the help of hydra and kept on the formation between auxiliary track for being picked up by portals for leading them to point of laying in case portals are proposed to be used for transport and laying of sleepers.
- Contractor shall bring his own mechanized portal equipment which will be capable of traveling on the auxiliary track and will transport the sleepers from L-Xing to the location of linking. At the location of laying, the sleepers shall be laid at the required spacing ensuring that the centre line of sleepers matches with the centre line of proposed track. Instead of portals, sleeper laying equipment which does not require use of auxiliary track, can also be used for laying of sleepers.
- After the sleepers are laid on the ballast bed of 200 mm thickness, contractor shall arrange his own Rail Threader to pick up the auxiliary track rails from both sides and lay on the PSC sleeper at Rail Seat to complete the laying of track.
- The ballast lying along the track shall be put in the track in the cribs and shoulders for taking up the work of lifting of track to provide required cushion of 350 mm.
- Track shall be lifted and aligned by small track machines. The lifting and aligning machine should be light in weight and should be transportable by road from one site to another. This lifting, aligning and tamping may be required in 2-3 phases until the desired clear cushion and proper alignment is achieved.
- Behind the lifting aligning machine, a contractor’s small track machine capable of tamping to be deployed. The Tamping machine should have 8 Nos. of tamping tools so that one sleeper can be tamped completely per insertion. This light duty tamper should be self propelled and should be transportable by road from one place to another.
- The contractor shall unload additional ballast over the track by his own mechanized means or manually as per site conditions and directions of Engineer to achieve desired ballast profile.
- For achieving the desired cushion and to fill the interspace of sleepers as well as crib ballast as per final profile, whatever ballast will be required in phases to be unloaded by the contractor with his own equipment and machinery.
Bidding Documents can be downloaded free of cost from RVNL website www.rvnl.org and RVNL e- Tendering portal i.e. https://rvnl.euniwizarde.com/.
Source: RVNL-Tender | Image Credit (representational): MoR
