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Dual-Car Scissor Lift with Turntables: Proven 10-Ton Lift

Project Overview

A luxury private estate and architectural residence in Phuket, Thailand, required a high-capacity subterranean automotive parking elevator to transport multiple full-size luxury vehicles between a ground-floor landscaped driveway and an underground subterranean collection gallery. The architectural layout prohibited exterior concrete vehicle ramps to preserve garden aesthetics. Furthermore, tight subterranean basement boundaries made multi-point vehicle maneuvering impossible once lowered. The owner required a unified lift platform capable of lowering two full-size SUVs or sports cars simultaneously, followed by independent right-angle vehicle rotation within the basement garage.

  • Country/Region: Phuket Luxury Residential Estate, Thailand

  • Client Facility: Private Luxury Villa Subterranean Collector Garage

  • Equipment Model: Gradin Custom Dual-Car Scissor Lift with Turntables (Model: G-DST-10T-13.8M)

  • Industry Classification: Automotive Manufacturing

  • Rated Dynamic Payload: 10,000 kg (10.0 Metric Tons rated working capacity)

  • Platform Dimensions: 13,800 mm (L) x 6,000 mm (W) massive rectangular steel deck

  • Integrated Turntable Specifications: 2 independent motorized rotary turntables (Diameter: 5,500 mm each, flush-mounted)

  • Vertical Rise & Landings: 4,900 mm (4.9 Meters) vertical stroke connecting Ground Level to Basement Level B1

  • Architectural Pit Dimensions: 13,900 mm (L) x 6,100 mm (W) with a low collapsed profile under 1,200 mm

  • Surface Finish: Architectural Matte Sand White polyurethane coating with 8.0 mm heavy-gauge steel deck plates

To solve tight underground geometry while ensuring whisper-quiet residential operation, the Gradin engineering team engineered a heavy-duty Subterranean Villa Car Elevator. The machine integrates a massive 3-Bay Tandem Multi-Scissor Structure embedded with Integrated Dual 5.5m Vehicle Turntables. Manufactured in full compliance with the EN 1570-1 Safety Standard for lifting tables and vehicle scissor platforms , the client integrated this Gradin automotive system alongside our portfolio of custom heavy-duty vehicle scissor lifts  to deliver seamless, automated subterranean parking.

Challenge & Solution

Challenge

Lifting 10 metric tons on an expansive 13.8m x 6.0m platform while integrating dual 5.5m flush motorized rotating discs introduced severe mechanical deflection, hydraulic synchronization, and kinematic clearance challenges:

  • Massive 13.8m x 6.0m Deck Deflection Under Asymmetric 10-Ton Wheel Loads: Driving two heavy luxury vehicles (up to 5,000 kg each) onto the expansive 82.8-square-meter deck creates extreme localized point wheel loads and severe off-center bending moments. The frame requires exceptional Ultra-Wide Platform Deflection Rigidity built with heavy #20 channel steel framing to prevent deck twisting and track binding.

  • Micro-Level Multi-Cylinder Hydraulic Synchronization: The 3-bay scissor mechanism relies on multiple long-stroke Phi 120/100 hydraulic cylinders spaced along a 13.8-meter longitudinal axis. Uneven vehicle parking positions alter the center of gravity dynamically. The system requires high-precision Multi-Cylinder Hydraulic Synchronization to prevent longitudinal deck tilt during 4.9m vertical travel.

  • Flush Integration of Dual 5.5m Turntables: Embedding two 5,500 mm circular turntables into an 8mm steel deck requires absolute coplanar alignment. Any vertical lip or seam misalignment between the turntable perimeter and the scissor deck damages low-clearance supercar splitters and creates rotational friction during 90-Degree Underground Rotation Turning.

  • Zero Hydraulic Drift for Overnight Subterranean Holding: Luxury vehicles remain parked on the lowered or elevated platform for extended durations. Any micro-leakage in hydraulic valves causes vertical settling, misaligning garage thresholds. The hydraulic power station requires a specialized Zero-Drift Hydraulic Load Holding manifold to maintain zero millimeter creep over weeks of stationary parking.

  • Low Collapsed Height in Restricted 1,200mm Pit Depth: Water table limits in coastal Phuket capped civil pit excavation depth. The Gradin engineering team had to nest the entire 3-bay 2-tier scissor mechanism and turntable gear drives within a collapsed height of under 1,200 mm without sacrificing structural strength.

  • Whisper-Quiet Residential Power Station and Dual Remote Controls: Residential estate standards mandate quiet operation. The 12.5 kW power unit requires low-noise pumps, damped hydraulic piping, and dual ergonomic multi-channel wireless remotes integrating lift, lower, emergency stop, and independent turntable rotation controls.

Solution

The Gradin engineering team designed an integrated electro-hydraulic subterranean vehicle parking and rotational elevator combining high-strength structural engineering, proportional hydraulics, and dual-axis automation:

  • 3-Bay Tandem Multi-Scissor Heavy Steel Chassis: The structural framework is engineered as a 3-Bay Tandem Multi-Scissor Structure utilizing 250 mm x 100 mm x 6 mm heavy rectangular steel scissor arms. Supported by a heavy #20 channel steel top and bottom grid chassis, the platform delivers exceptional Ultra-Wide Platform Deflection Rigidity, keeping maximum full-load deflection below 3.0 mm across the entire 13.8m span.

  • Integrated Dual 5.5m Motorized Vehicle Turntables: The deck embeds Integrated Dual 5.5m Vehicle Turntables fabricated with 8.0 mm heavy steel plates. Each turntable features high-precision slewing ring bearings, variable-speed electric gear drives (1 minute per full 360-degree rotation), and integrated braking dampers, enabling smooth 90-Degree Underground Rotation Turning while the scissor platform remains stationary.

  • Multi-Cylinder Proportional Hydraulic Synchronous Drive: Vertical lifting is powered by four heavy-duty Hengyu Phi 120/100 hydraulic cylinders connected via Phi 27 high-pressure steel pipelines. Driven by a 12.5 kW Siemens Grade-2 efficiency motor and Beijing Huade proportional valves, the system achieves flawless Multi-Cylinder Hydraulic Synchronization at a smooth travel speed of 4.0 m/min.

  • Hard-Seated Zero-Drift Load Holding Manifold: The hydraulic power station features a Zero-Drift Hydraulic Load Holding valve block equipped with pilot-operated check valves and manual emergency pressure relief controls located directly on the platform deck for maintenance access.

  • Compact Collapsed Profile for 1,200mm Shallow Pit: Finite element optimization allowed the entire 3-bay 2-tier scissor structure, hydraulic actuators, and dual turntable slewing drives to nest into a retracted height under 1,200 mm, fitting perfectly into the 13,900 mm x 6,100 mm concrete pit.

  • Siemens S7 PLC & Schneider Automation with Dual Handheld Remotes: Controlled by a centralized Siemens PLC enclosure with Schneider Electric switchgear, the Dual-Car Scissor Lift with Turntables comes with two bespoke wireless remotes and wall consoles. The entire Subterranean Villa Car Elevator operates in full adherence to the EN 1570-1 Safety Standard.

Technical Specifications

Technical Parameter Specification / Engineering Metric Manufacturing Standard & Brand Components
Equipment Architecture Heavy-Duty 3-Bay 2-Tier Scissor Platform Dual-vehicle subterranean hydraulic elevator
Target Application Ecosystem Subterranean Villa Car Elevator Luxury private estate underground collector garage
Rated Dynamic Payload 10,000 kg (10.0 Metric Tons total capacity) Static structural safety overload factor: 200% (20,000 kg)
Platform Deck Dimensions 13,800 mm (L) x 6,000 mm (W) 8.0 mm high-strength solid steel deck plates
Maximum Vertical Lift Stroke 4,900 mm (4.9 Meters) vertical travel Ground level driveway to basement B1 parking level
Integrated Turntable Units Integrated Dual 5.5m Vehicle Turntables 2 units of Phi 5,500 mm flush rotating turntables
Turntable Rotation Speed 1.0 rpm (1 minute per full 360-degree rotation) Smooth frequency-inverter drive with parking dampers
Vehicle Maneuver Capability 90-Degree Underground Rotation Turning Independent turntable rotation when lift is stationary
Scissor Mechanical Architecture 3-Bay Tandem Multi-Scissor Structure 250 mm x 100 mm x 6 mm rectangular structural box tubing
Chassis Structural Profiles Heavy #20 Channel Steel ([20 Profile) Solid welded lattice chassis top and base frames
Structural Rigidity Rating Ultra-Wide Platform Deflection Rigidity < 3mm High-tensile cross-braced under-deck stiffeners
Hydraulic Drive Assembly Multi-Cylinder Hydraulic Synchronization Four Phi 120/100 heavy-wall honed hydraulic cylinders
Hydraulic Power Station Unit 12.5 kW 380V Siemens Grade-2 Energy Motor Beijing Huade valve manifold + Phi 27mm high-pressure lines
Hydraulic Creep Elimination Zero-Drift Hydraulic Load Holding Hard-seated pilot-operated load-holding check valves
Civil Pit Foundation Size 13,900 mm (L) x 6,100 mm (W) x <1,200 mm Pit Ultra-low collapsed profile under 1,200 mm
Vertical Lifting Speed 4.0 meters / minute (Smooth travel) Proportional ramp acceleration and soft-stop cushion
Surface Finish Coating Architectural Matte Sand White Finish Multi-coat epoxy primer + polyurethane topcoat
Electrical Controls & Automation Siemens S7 PLC + Schneider Electric Gear Includes 2 integrated ergonomic multi-function remotes
Global Safety Code Compliance EN 1570-1 Safety Standard  European & international lift table safety regulations

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