Synchronous Jacking Systems

Multi-point computerized hydraulic lifting systems that maintain millimeter-level synchronized movement across all lifting points for crane structures up to 2,500+ metric tons.

ZPMC USA owns and operates advanced Synchronous Jacking Systems (SJS) — multi-point hydraulic lifting systems that use centralized computerized control to ensure every lifting point moves in perfect synchronization, regardless of load variations or structural tolerances. This real-time control prevents differential displacement that could introduce damaging stress into crane structures worth tens of millions of dollars.

How Synchronous Jacking Systems Work

Unlike conventional hydraulic lifting methods, synchronous jacking systems utilize a centralized computerized control platform that continuously monitors and adjusts each hydraulic cylinder throughout the operation. During a lifting operation, hydraulic cylinders are positioned at designated support locations based on project-specific engineering analyses. Each cylinder connects to a centralized hydraulic power and control system that continuously monitors load, stroke, pressure, and displacement data.

Sophisticated control software automatically adjusts hydraulic flow and pressure to keep all lifting points synchronized — allowing the structure to remain level and stable while being raised, lowered, translated, or repositioned. The result is a highly controlled lifting process capable of safely manipulating structures weighing thousands of tons while maintaining precise geometric tolerances.

Modern STS cranes frequently exceed 1,000 to 2,500 metric tons in operating weight. In a typical multi-point lift, each hydraulic cylinder may support hundreds of tons while maintaining synchronized movement within extremely tight tolerances.

Applications in Crane Modernization

• Ship-to-Shore crane heightening projects
• Rail gauge widening and terminal expansion programs
• Crane leg replacement operations
• Boom extension and outreach modification projects
• Structural rehabilitation and repair
• Heavy component installation and replacement

Engineering Benefits

Synchronous jacking technology provides significant advantages over conventional lifting methods: enhanced structural protection through balanced lifting forces, improved operational safety, precise control of load position and elevation, reduced potential for structural distortion, real-time monitoring of critical lifting parameters, and increased efficiency during complex modification projects.