Freyssinet flat jack rentals offer ultra-low profile hydraulic lifting solutions for structural engineers and contractors working in confined spaces. Designed for bridge bearing replacement, load transfer, and precision structural correction, flat jacks deliver controlled lifting force where conventional hydraulic cylinders cannot fit.
Manufactured by Freyssinet, Freyssi Flat Jacks are ultra-low profile hydraulic lifting devices engineered for structural applications where vertical clearance is extremely limited. Unlike traditional hydraulic jacks that use a projecting piston or ram, flat jacks consist of a thin, sealed steel chamber that expands vertically when pressurized.
When connected to a high-pressure hydraulic pump, hydraulic fluid enters the flat jack and causes the internal chamber to expand in thickness. This expansion generates controlled lifting force across a wide bearing surface. Because of their minimal collapsed height, Freyssinet flat jacks can be inserted into spaces where even low-height cylinders cannot operate.
Flat jack rentals are widely used in civil engineering, infrastructure rehabilitation, and heavy structural projects that require precise load transfer and controlled incremental lifting.
Freyssinet flat jack rentals provide unique advantages for structural lifting operations:
Ultra-low collapsed height for insertion into extremely restricted spaces
High load capacity relative to overall profile thickness
Uniform load distribution across structural surfaces
Controlled, incremental lifting capability
Compatibility with high-pressure hydraulic pump systems
Because flat jacks distribute force over a larger surface area than traditional cylinders, they reduce localized stress concentrations during lifting. This makes them especially valuable in bridge and concrete rehabilitation projects.
Flat jack rentals are most commonly used in heavy civil and infrastructure environments where precision matters.
Typical applications include:
Bridge bearing replacement and adjustment
Structural realignment and correction
Load transfer during infrastructure retrofits
Incremental lifting of concrete segments
Steel beam positioning and support
Tunnel and transit system rehabilitation
In bridge bearing replacement projects, flat jacks are inserted beneath girders or deck elements to carefully raise the structure just enough to remove and replace worn bearings. The ability to operate in millimeter-level clearances makes them indispensable for this type of work.
Unlike bottle jacks or low-height hydraulic cylinders, flat jacks expand through internal chamber pressurization rather than piston extension. This design creates vertical expansion while maintaining a wide, stable contact surface.
Because flat jacks typically have limited stroke, they are commonly used in staged lifting procedures. After a small lift is achieved, steel shims or cribbing are inserted to mechanically secure the load before additional lift increments are applied.
This method provides precise control and enhances safety during structural lifting operations.
Proper system configuration is critical for safe operation.
Flat jack rentals are typically paired with:
High-pressure hydraulic pumps
Precision pressure gauges
High-pressure hoses and quick-connect couplers
Load transfer plates
Steel shims and cribbing systems
Mechanical safety supports
Monitoring pressure is essential to ensure uniform load distribution and controlled lifting progress.
Flat jacks are specialized tools primarily used in bridge and structural engineering projects. For many contractors, purchasing this equipment outright is not practical.
Advantages of flat jack rentals include:
Access to specialized ultra-low profile lifting solutions
No long-term storage or maintenance obligations
Professionally inspected and calibrated equipment
Ability to scale capacity to project demands
Ideal for short-term infrastructure rehabilitation projects
Renting ensures that the correct lifting capacity and configuration are available without capital investment.
Flat jack rentals are widely used across:
Bridge & Highway Construction
Civil Infrastructure Rehabilitation
Structural Engineering Firms
Rail & Transit Authorities
Marine & Port Facilities
Power Generation Infrastructure
These industries depend on ultra-low profile hydraulic lifting solutions to maintain structural integrity while performing complex repairs.
Flat jacks are specialized tools used for specific projects, making rentals more practical than ownership.
Yes. Flat jacks are commonly used for leveling structures and correcting settlement conditions.
Flat jacks typically provide short stroke lengths, often under a few inches depending on model.
They can. Hydraulic Rentals can supply complete flat jack rental packages including hoses, couplers, and pressure gauges.
Flat jacks can be powered by hand pumps, electric pumps, air pumps, or gasoline hydraulic pumps depending on the application.
Yes. Flat jacks are commonly used for lifting bridge components during bearing replacement.
Flat jacks are used when clearance is limited and standard cylinders cannot fit.
Freyssi flat jacks are used for low-clearance hydraulic lifting and structural load transfer applications.