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Delivery & Commissioning of MG100t‑5m Dam‑top Gantry Hoist for Canyon Hydropower Station
Address:Canyon Hydropower Station
This medium‑sized hydropower station is located in mountain‑canyon areas of Southwest China, featuring large reservoir drop, persistent high‑humidity water vapor and sharp day‑night temperature differences.
This medium‑sized hydropower station is located in mountain‑canyon areas of Southwest China, featuring large reservoir drop, persistent high‑humidity water vapor and sharp day‑night temperature differences. The dam flood‑release gates and maintenance gates are heavy‑duty structures. Rapid gate opening‑closing is required for water level regulation in flood seasons, while underwater hoisting & maintenance of gates are carried out in dry seasons. Conventional hoisting equipment suffers poor resistance to vapor corrosion, and faces hidden troubles such as electric control icing, steel corrosion and brake failure under high‑altitude low‑temperature conditions.
After technical comparison among multiple hoisting manufacturers and field investigation on Dafang’s proven water‑conservancy gantry hoist projects, the project owner customized the MG100t‑5m special‑purpose dam‑top gantry hoist with 100t rated lifting load and 5m standard gate lifting stroke. Dafang technical engineers conducted multiple on‑site surveys at the canyon dam site to collect parameters including altitude‑induced temperature difference, reservoir vapor corrosion and dam‑top rail bearing capacity. Targeted optimizations were implemented for overall anti‑corrosion performance, low‑temperature waterproof electric control and heavy‑load braking system. The non‑standard water‑conservancy hoist was manufactured within 62 days. Segmented components were transported to the canyon dam site. Load test and water‑conservancy safety acceptance were completed in one pass, and the equipment was officially put into service for gate operation and maintenance hoisting.
Project Execution & Solution Overview
Dafang supplied the MG100t‑5m dam‑top gantry hoist for this project. Key project milestones and engineering solutions are listed below:
Dafang engineering team carried out multiple field surveys at the canyon dam site, collecting working‑condition parameters including altitude temperature difference, reservoir vapor corrosion and dam‑top rail bearing capacity. Targeted optimizations were made for anti‑corrosion performance, low‑temperature waterproof electric control and heavy‑load braking system to adapt to real‑world hydropower‑station site conditions.
According to gate operation requirements of the power station, the MG100t‑5m water‑conservancy gantry hoist was customized. It features 100‑ton rated lifting load and 5‑meter standard gate lifting stroke, meeting dual demands of flood‑release gate operation and gate maintenance hoisting.
The whole non‑standard water‑conservancy hoisting equipment was finished within a 62‑day manufacturing cycle. Strict component processing, welding NDT and complete factory inspection were implemented to guarantee equipment reliability under cold and high‑humidity conditions.
Turn‑key Dam‑top Site Commissioning & Operation
Segment‑modular equipment was delivered to the canyon dam site. Load test and water‑conservancy safety acceptance were completed in one pass. The equipment was officially commissioned for dam‑gate opening/closing and maintenance hoisting tasks.
Core Technical Features & Advantages
Weather‑resistant Box‑type Gantry for Long‑term Resistance against Reservoir Vapor Corrosion
The hoist adopts single‑box‑girder gantry structure. Gantry legs and main girder are made of Q355N weather‑resistant anti‑corrosion steel plates to cope with perennial mist and rain erosion in reservoir area. All load‑bearing welds are subject to 100% ultrasonic non‑destructive testing. With A6 high working class, the equipment enables uninterrupted heavy‑load gate opening and closing all year round. Dafang red heavy‑duty anti‑corrosion system with four‑layer epoxy coating resists vapor and UV radiation, preventing peeling and rusting under long‑term open‑air water‑adjacent service. Ladders, maintenance platforms and fasteners are all hot‑dip galvanized against mist corrosion. Widened and reinforced gantry meets the installation constraints of narrow dam‑top platform.
100t Heavy‑load Water‑conservancy Lifting Mechanism for Smooth Non‑impact Gate Start‑stop
Equipped with custom‑designed large‑drum lifting winch for water conservancy, the wire rope is neatly multi‑layer wound with anti‑rope‑shedding baffles on drum. The lifting reducer adopts heavy‑duty wear‑resistant gear sets and dual‑brake safety structure combining main brake and emergency brake. The gate will be locked immediately once power cuts off to eliminate uncontrolled gate sliding. Dual‑speed lifting realizes fast gate movement for flood‑season water‑level regulation and low‑speed precise positioning for gate sealing maintenance, satisfying both flood‑discharge and overhaul working conditions.
IP65 Waterproof Low‑temperature‑resistant Electric Control for Stable Operation in High‑altitude Canyon
Sharp day‑night temperature difference on dam‑top easily causes condensation inside electric cabinets. The whole electrical system is specially upgraded for water‑conservancy scenarios. IP65 waterproof & dust‑proof control cabinet is fitted with built‑in constant‑temperature heating & dehumidification modules which activate automatically under low temperature to avoid electronic component failure caused by icing. Motors adopt waterproof sealed windings and cables use water‑aging‑resistant special sheaths to block rain and mist intrusion. Complete safety interlock devices including overload protection, lifting height limit, travel limit, wind speed monitoring and emergency stop are provided. Local cab control and remote interconnection with hydropower station central control system are both available.
Integrated Layout for Narrow Dam‑top Space, Optimized for On‑site Water‑conservancy O&M
Compact modular design fits the narrow dam‑top platform. Travelling rails match original embedded foundations on dam surface without large‑scale civil reconstruction. The enclosed top cab isolates operators from wind, rain and reservoir mist, offering direct sight toward gate shaft for comfortable operation. Reserved lifting points and maintenance access passages eliminate extra scaffolding work and greatly reduce daily dam maintenance cost. Rail‑mounted wind‑proof rail clamps lock the whole equipment automatically under canyon gusts to prevent displacement.
On-Site Delivery & After-Sales
The MG100t dam‑top gantry hoist is disassembled into main girder, gantry legs, lifting winch and electric control units and delivered to the canyon hydropower station by special vehicles in batches. Our professional water‑conservancy installation team completes full‑range on‑site work including gantry assembly, rail alignment, lifting system connection and full‑load gate load test. Complete documentation is delivered: material & NDT reports, third‑party water‑conservancy load test certificates, special‑equipment factory certificates and full‑set project acceptance documents, assisting the power station in flood‑control‑equipment safety filing.
After commissioning, targeted training is provided for station O&M teams, covering fast gate operation in flood season, anti‑corrosion maintenance under misty environment and periodic inspection requirements for dual‑brake system. 7×24‑hour full‑lifecycle remote technical support is available. Original spare parts for winches, brakes and electric controls are kept in stock to guarantee uninterrupted annual water‑level regulation and gate maintenance of the hydropower station.
Summary
The batch‑shipped GJM40.5t rail‑mounted container gantry cranes for Mongolian ports are special‑purpose export cranes developed by Dafang Heavy Machinery for windy, frigid land border ports. Featuring four core strengths: low‑temperature steel structure, Grade‑8 wind‑resistance, bilingual intelligent electric control and standard container telescopic spreader, they perfectly solve container‑handling challenges in Mongolia’s cold and sandy yards.
Dafang Heavy Machinery customizes 30t‑60t rail‑mounted / rubber‑tyred container gantry cranes for global ports, land ports and container‑logistics enterprises. Customization is available for special working conditions such as low temperature, high temperature and heavy salt spray. We provide one‑stop foreign‑trade services: solution design, batch production, export‑grade modular packaging, overseas on‑site installation and complete multi‑language customs‑clearance & inspection documents. Feel free to contact us for customized solutions and quotations for overseas container‑yard lifting‑equipment demands.
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