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| 1 | The agency shall provide qualified and experienced manpower and necessary equipment for the servicing and operation of a 20-ton capacity gantry crane for gate repair works at the barrage. The work shall involve the operation of the crane, stop log handling, underwater installation with divers, and support for associated miscellaneous tasks, as detailed below: Crane Operation and Support Services.One (1) Skilled Gantry Crane Operator shall be deployed for precise operation of the gantry crane throughout the gate repair period and Four (4) Skilled Helpers shall assist in miscellaneous operations including :(a)Mounting and securing the hanger assembly onto the gantry crane and inspecting the fitting. (b)Repeated connection/disconnection of the gantry power cable to the gate socket to maintain uninterrupted power supply. (c)Continuous observation of the gearbox, brake assemblies, and crane movement during operations. (d)Ensuring proper rail alignment of the gantry crane throughout the operation. Misalignment may lead to derailment or tipping, which poses a serious safety risk.Stop Log Handling and used to stop the pond water during the gates repairing work. (a)Using the gantry crane and hanger, three (3) pairs of stop logs shall be lifted from the rest boom located on the pier and transported to the designated barrage gate under repair. (b)The alignment of the gantry and precise placement of stop logs shall be maintained by the helpers under the supervision of the crane operator. The agency shall provide a fully equipped diving team comprising: (i).Two (2) Professional Divers (ii).Two (2) Diver Assistants (iii).One (1) Surface Supervisor to monitor the underwater operation and manage diver safety (e )Diving Equipment & Safety Gear includes:Oxygen cylinders, Diver suits and goggles, Life jackets, Jetting machine (for silt removal) with compressor and Safety harnesses and belts. The following underwater activities will be carried out under supervision: 1.Stop Log Placement: Ensure stop logs are accurately positioned in the grooves of all three piers, reaching up to the sill level for effective water stoppage. 2.Silt Removal at Sill Level: In case of silt accumulation, use the jetting machine to remove the deposit and allow proper placement of stop logs. 3.Alignment Maintenance Underwater: Ensure that stop logs do not tilt during installation. Misalignment may lead to jamming or unbalanced load on the gantry. 4.Obstruction Management: If the stop log gets stuck in the groove and the crane shows load, the hanger must be immediately detached, and the obstruction cleared underwater to avoid crane tipping. 5.Leakage Control: If stop logs show leakage, it must be sealed using jute bags, dhotis, rubber strips, or leak-proof compound to maintain water levels and ensure a dry working condition for gate repair. 6. post-Repair & Emergency OperationsOnce gate repair is completed: (a)The stop logs shall be removed and shifted to the next gate or back to the rest boom using the crane and hanger. (b)The previously worked gate shall be shut down properly and declared free for operation.©The crane, hanger, and stop logs shall be returned to the department in the same condition as received. NOTE- In case of flood or sudden rise in pond level before completion of gate repair: • The agency shall immediately remove stop logs from the gate groove using the hanger and gantry and place them back on the rest boom on the barrage pier. • Once the flood subsides, the same procedure shall be repeated to re-install the stop logs and resume repairs. • No additional cost shall be paid for repeated installation/removal due to flood conditions. |
| 2 | The agency shall provide, install, maintain, and dismantle a scaffolding system/temporary working platform for carrying out essential maintenance and repair works under the sluice gates of the barrage.This platform will facilitate operations such as:Greasing and oiling of gate mechanical components• Replacement of guide tracks, gate shoes, and oil seals• Any other related structural/mechanical repair works as directed by the Engineer-in-ChargeTechnical SpecificationsThe scaffolding shall be constructed using:(a)40 mm dia bamboo poles or mild steel (MS) tubes(b)Horizontal and vertical members placed at 1.5 cm center-to-center spacing©Cup & lock system for secure jointing(d)MS clamps, wooden planks (challis), support ropes, and stripsThe system shall be erected by expert labor experienced in working under and near water conditions. With safety measures •All scaffolding materials, tools, and labor shall be transported to the specific working gate by the agency using their own boats and transport systems.•During platform erection, all required safety gear must be present at the site and ready for use. All activities shall be carried out strictly under the direction and supervision of the Engineer-in-Charge.NOTE- In the event of sudden water discharge at the barrage during ongoing scaffolding work, if the scaffolding needs to be dismantled before the work is completed, the agency shall be required to reinstall the same at the direction of the Engineer-in-Charge once conditions permit. No extra payment shall be made for such repeated installation/dismantling due to emergency conditions. |
| 3 | The work includes thorough cleaning of the exposed steel surfaces of gates, including both the front and back sides of Gates No. 03 to 12 of the under sluice section of the barrage. The cleaning operation shall cover the following:•Manual cleaning of all steel parts and gate components, especially those located on the back side of the gates (submerged in raw water) and exposed to prolonged water contact.(a)Removal of algae, silt, floating debris, waterborne sludge, and rust deposits accumulated on the surfaces due to exposure to raw water.(b)Cleaning shall be carried out using stainless steel wire brushes by skilled and experienced laborers.(c )Special attention shall be given to the grooves, joints, and edges of the gates to ensure complete removal of deposits and contaminants.(d )All work is to be executed as per the directions and supervision of the Engineer-in-Charge |
| 4 | Improvement, Repair, and Maintenance of Under Sluice Gates (Gate No. 03 to 12) at Yamuna River Barrage Improvement, repair, and routine maintenance of under sluice gates (Gate Nos. 03 to 12) of the Yamuna River Barrage. The objective is to ensure smooth, reliable, and safe operation of the gates by carrying out the following activities: a) Oiling and greasing of all moving and stationary components of the gates, as and when required, to ensure corrosion-free and frictionless operation.(b) Lubrication and adjustment of the hoisting mechanism, including:(a)Application of oil and grease to hoist parts(b)Setting and alignment for accurate and stable support©Ensuring smooth and synchronized movement of hoisting equipment of gates.(d)Ensuring that the gates close properly and completely without obstruction or malfunction(e)All work shall be carried out under the supervision of the Engineer-in-Charge, in accordance with approved technical standards and safety procedures |
| 5 | Realignment of Misaligned Under Sluice Gates to Ensure Smooth Operation and Sealing. The scope of work involves the realignment of under sluice gates (which have become misaligned over time) to restore heir proper vertical movement and sealing efficiency during discharge operations.(a)Several gates have developed alignment issues, resulting in obstruction during lifting and lowering operations, and increasing the risk of the gate coming off from the grooves. (b)The agency shall carry out correction of the gate alignment using hydraulic jacks and alignment-setting machines, operated by expert and experienced technicians. (c)The objective is to: (a)Ensure that the gate moves smoothly and vertically within its designated groove (b)Prevent misalignment-related risks during pond discharge or gate closure ©Restore the gate’s ability to completely seal off water flow when required (d)The alignment shall be set so that the gate can be reliably opened and closed during pond discharge operations without jamming or leakage. (e )All work shall be carried out under the supervision and as per the instructions of the Engineer-in-Charge. for under sluice gate no 3,7,10,11 and 12 |
| 6 | The work includes the replacement of lower and upper cast iron guide shoes for Under Sluice Gates No. 03 to 12 of the barrage, to ensure smooth and aligned movement of the gates within the grooves during operation (a)Removal of existing worn-out or damaged lower and upper guide shoes (b)Fabrication and replacement of new cast iron guide shoes as per the approved sample and specifications (c )Ensuring proper alignment of the guide shoes with the gate structure to facilitate smooth vertical movement (d ) Installation and fitting of the new guide shoes, including: • Drilling of holes as required • Welding and fixing operations • Use of appropriate fasteners (nuts, bolts, washers, etc.) for secure fitting (e )Final alignment and testing to confirm free movement within the gate groove (f )All activities shall be carried out under the supervision and as per the direction of the Engineer-in-Charge for under sluice gate no 3,7,10,11 and 12 |
