Gradin resolves these harsh environment anxieties with our heavy-duty, marine-engineered Circular Hydraulic Scissor Lift. Specifically developed as a custom Water Conservancy Lifting Platform, this unit utilizes a rugged Double-Span Scissor Lift Table configuration. It is built to operate reliably inside narrow, deep circular pits. Capable of raising massive gate valves and mechanical dredging equipment, this Circular Pit Scissor Table deploys smoothly under wet, high-salinity conditions. Compliant with international ASME B20.1 safety codes and EN1570 guidelines, our system ensures zero vertical swaying and absolute level alignment with surrounding concrete walkways. Consult with our fluid power engineers and explore our comprehensive range of Gradin Custom Material Lifts to customize your water conservancy shaft lifting solution.
Each Circular Hydraulic Scissor Lift is custom-manufactured based on the specific diameter of your circular shaft and water-head pressure. The table below represents the standard technical specifications of the SJG11-5.0 model configured for wet dam environments.
| Technical Parameter | Standard Specification (SJG11-5.0) | Bespoke Customization Support |
| Model Designation | SJG11-5.0 / SJG Hydraulic Lifting Platform | Fully Customizable by Gradin to Pit Dimensions |
| Platform Deck Configuration | D = 10,000 mm / Ground-Flush Circular Lift | Customized Diameters from 3,000 to 15,000 mm |
| Rated Carrying Capacity | 11,000 kg / Water Conservancy Lifting Platform | Custom engineered up to 35,000 kg (35 Tons) |
| Lifting Height / Stroke |
5,000 mm (Collapsed: 1,350 mm – Raised: 6,500 mm) |
Vertical travel heights customizable up to 15 m |
| Steel Linkage Structure | Double-Span (Double-Span Scissor Lift Table) | Q355B Steel Scissor Mechanism Box-Section |
| Waterproof Rating | IP67 Limit Switches & Sealed IP66 Control Box | Explosion-proof (Ex-d) and Chemical-Resistant Packages |
| Travel Speed | 0.4 m/min | Variable Frequency VFD controls from 0.1 to 1.5 m/min |
| Anti-Corrosion Grade | ISO 12944 C5-I Marine Epoxy Zinc-Rich | Customized HDG (Hot-Dip Galvanized) or SUS304 Deck |
| Installation Form | Circular Pit Scissor Table Deep Base | Pit-Installed Scissor Lift Table Pre-buried Anchors |
Epoxy Zinc-Rich C5-I Marine-Grade Coating
Field Pain Point: Standard paint coatings degrade rapidly inside high-humidity water conservancy shafts, leading to deep rust and structural fatigue of the metal frame within months.
Bespoke Solution & Benefit: Gradin treats the entire Circular Hydraulic Scissor Lift steel frame with a multi-layer sandblasted epoxy zinc-rich primer and polyurethane topcoat complying with ISO 12944 C5-I standards -> preventing moisture intrusion and ensuring a rust-free mechanical lifespan exceeding 20 years in damp shafts.
Sealed IP67 Waterproof Electrical & Limit Switches
Field Pain Point: Water splashing from dam sluices can easily short-circuit standard limit switches and junction boxes, causing sudden mid-operation lift lockouts.
Bespoke Solution & Benefit: Integrating heavy-duty IP67 waterproof proximity and limit switches coupled with double-sealed junction boxes -> ensuring continuous, fault-free signal transmission even under direct water spray and high moisture condensation.
Synchronized Heavy-Duty Double-Span Scissor Linkage
Field Pain Point: Uneven loading when hoisting heavy water gate valves off-center places massive bending stress on lifting arms, risking cylinder binding or mechanism warping.
Bespoke Solution & Benefit: Engineering a Double-Span Scissor Lift Table with a Q355B Steel Scissor Mechanism linked by a solid central synchronization shaft -> dividing dynamic lifting forces evenly across four cylinders to guarantee perfectly level ascension under severe off-center loads.
Integrated Platform Maintenance Access Hatch
Field Pain Point: Performing maintenance on hydraulic cylinders inside a closed, dark circular pit requires dangerous crawling or dismantling the entire 10-meter platform.
Bespoke Solution & Benefit: We build a reinforced, flush-mounted maintenance access hatch with mechanical limit safety interlocks directly into the deck surface -> allowing service technicians to safely access cylinders and plumbing directly from the platform top.
Perimeter High-Strength Safety Chains & Protective Handrails
Field Pain Point: When lifting equipment inside a deep hydroelectric shaft, workers standing near the platform edges face catastrophic fall risks during rapid vertical movement.
Bespoke Solution & Benefit: Surrounding the deck with a continuous steel guardrail system matched with heavy-duty interlocking safety chains providing complete fall protection for crew and equipment without blocking loading flexibility.
Ground-Flush Deck with Stainless Steel Drainage Grates
Field Pain Point: Water dripping from lifted sluices pools on the lift surface, creating a slip hazard for personnel and corroding standard steel platform decks.
Bespoke Solution & Benefit: Designing a Ground-Flush Circular Lift with a patterned non-slip deck and peripheral stainless steel water drainage channels -> draining water immediately into the pit sump pump to keep the working surface dry and slip-free.
Hydraulic Overload Bypass Spillway Relief Valve
Field Pain Point: Attempting to hoist jammed water gates or heavy debris exceeding the rated capacity can blow hydraulic seals and cause rapid gravity descent.
Bespoke Solution & Benefit: Integrating an automatic hydraulic spillway relief valve inside the SJG Hydraulic Lifting Platform power pack -> immediately bypassing oil to the tank and preventing lift movement if the load exceeds the limit, preserving hydraulic structural integrity.
Emergency Gravity-Descent Manual Lowering Valves
Field Pain Point: Hydroelectric dam power grid failures can strand maintenance workers and valuable tools mid-air inside a deep dark shaft with no power.
Bespoke Solution & Benefit: Outfitting the hydraulic system with a manually-operated pressure-compensated gravity descent valve at the base allowing safe, controlled platform lowering to the bottom floor without electric power during blackouts.
Hydroelectric Dam Intake Screen & Trash Rack Maintenance (Energy & Nuclear)
Hydroelectric facilities collect tons of floating river debris in trash racks inside deep circular intake shafts. Operators deploy the custom Water Conservancy Lifting Platform to lower heavy clearing rakes directly to the bottom. The high-capacity platform raises mud and trapped logs out of the wet pit, maintaining continuous dam water intake efficiency.
Sluice Gate & Radial Gate Hoist Inspections (Water Conservancy / Dams)
Radial gates control dam spillways and require regular cylinder inspections in tight, deep vertical concrete structures. This heavy-duty Circular Pit Scissor Table lowers engineers and their toolboxes flush to the gate seals. The high anti-corrosion rating of the lift ensures rust-free reliable movement inside these water-splashed, damp channels.
Municipal Flood Control Pump Station Overhauls (Advanced Manufacturing)
City drainage hubs rely on giant submerged pumps installed inside deep subterranean concrete shafts [1]. During maintenance, these pumps must be vertically extracted and set on stable platforms. The Double-Span Scissor Lift Table descends to receive the wet 11,000 kg pumps and lifts them to ground level, ensuring municipal flood readiness.
Deep-Well Turbine Chamber Inspections (Hydroelectric Power)
Deep inside generator vaults, turbine shafts must be accessed via tight circular hatches. The Ground-Flush Circular Lift is installed in these shafts, providing a non-slip, self-draining floor for mechanics. The lift raises replacement seals and heavy impellers from the basement level directly into the turbine chamber.
Water Treatment Plant Silt and Grit Vault Maintenance (Infrastructure)
Water purification plants utilize large circular sedimentation pits where heavy sand and grit extractors operate. Gradin’s custom Heavy-Duty Shaft Elevator descends into these circular vaults to provide a stable, water-draining platform for cleaning silt gear, withstands abrasive grit, and operates reliably in highly humid, chemical-treated environments.
For this heavy-duty series, we can engineer load capacities up to [300] tons, with platform dimensions and lifting heights customized to your operational envelope. Requirements exceeding our standard engineering matrix will undergo a Finite Element Analysis (FEA) by our engineering team to ensure structural viability before proposing a solution.
To initiate the engineering proposal, please provide the following baseline data:
Rated Load Capacity
Maximum Lifting Height & Closed Height
Platform Dimensions (L x W)
Duty Cycle (e.g., operational cycles per hour/day)
Environmental Conditions (e.g., indoor/outdoor, washdown, explosion-proof)
Pit depth or overhead clearance constraints
Yes. The control systems can be equipped with standard communication protocols (e.g., Profinet, Modbus, Ethernet/IP) utilizing [Siemens / Allen-Bradley / Omron] PLCs. This ensures seamless I/O signal synchronization with upstream/downstream conveyors, AGV/AMR units, and your central control room.
Every custom unit undergoes a mandatory Factory Acceptance Test (FAT) prior to dispatch. This includes continuous operational testing at 100% rated load, static overload testing at [120% / 125%] capacity, and the physical triggering of all mechanical anti-fall and hydraulic safety interlocks. FAT documentation and video proof are included in your engineering package.
Upon final approval of the General Arrangement (GA) drawings, the manufacturing lead time is typically 4 to 8 weeks. Oversized structural components are engineered with a modular design to fit into standard shipping containers (20FT/40HQ). On-site assembly utilizes pre-engineered bolted flange connections and heavy-duty aviation plugs, strictly eliminating the need for field welding.
We provide a standard [12/24]-month warranty covering the structural frame and primary hydraulic/electrical components. To minimize operational downtime, a comprehensive set of standard consumables (e.g., cylinder seal kits, travel switches, relays) is shipped alongside your equipment. During the warranty period, replacement parts for non-human-induced failures are dispatched via priority air freight (DHL/FedEx) within 48 hours.
Beyond the warranty, we guarantee lifetime engineering support. Your custom equipment's CAD drawings, electrical schematics, and BOM (Bill of Materials) are permanently archived in our system. This ensures you receive uninterrupted remote troubleshooting, maintenance guidance, and exact spare parts matching for the entire lifecycle of the equipment.
Gradin Machinery is a leading manufacturer specializing in aerial work platforms and hydraulic lifting solutions. With ISO & CE certifications, we provide safe, reliable, and customized equipment for global industrial needs
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