In the lifting of precast concrete elements, the behaviour of the hook-up system directly affects handling safety, stress control and the quality of the manufactured element during production, transport and installation phases.

In precast panels, narrow elements or manufactured elements subject to tilting, the lifting system must simultaneously ensure controlled force transfer, operational speed, safe engagement and adaptability to different handling configurations.

The Safelift system developed by B.S. Italia was created to meet these requirements through a configuration consisting of a tube embedded in the concrete, a shackle and an articulated hook, designed to control hook-up behaviour throughout all operational phases.

Table of contents

• The role of hook-up in lifting systems for precast elements
• Coupling between shackle and tube: operational safety and engagement control
• Articulated hook and absorption of dynamic stresses
• Reduced space requirements and integration in the precast manufactured element
• System versions and behaviour in different handling operations
• Reinforcement and concrete behaviour during lifting
• Safelift in lifting systems for precast elements

The role of hook-up in lifting systems for precast elements

In lifting systems for precast elements, the lifting point is not simply a mechanical connection between the manufactured element and the crane, but a temporary force transfer system that must operate under often variable and dynamic conditions.

During lifting, changes in cable inclination, rotations of the manufactured element and stress concentrations near the insert may occur. For this reason, the behaviour of the hook-up directly affects:

• the distribution of forces in the concrete;
• the stability of the manufactured element during handling;
• the control of local stresses.

The Safelift system is designed to manage these conditions through a controlled coupling mechanism between the shackle and the tube embedded in the precast manufactured element.

Coupling between shackle and tube: operational safety and engagement control

One of the central aspects of the Safelift system is the control of the engagement between the shackle and the insert.

The hook-up is carried out through a defined sequence of insertion, rotation and positioning of the shackle inside the tube, until the safety configuration is activated. This principle helps prevent incomplete hook-ups or unstable configurations during lifting operations.

The system is designed according to a controlled coupling logic that prevents handling from starting if the device has not been correctly inserted. In this way, the behaviour of the hook-up does not depend solely on the operator, but on the configuration of the system itself.

The possibility of releasing the shackle without removing the articulated hook also makes it possible to speed up operations during repetitive handling phases and reduce operational interference on site.

Articulated hook and absorption of dynamic stresses

During the lifting of precast elements, the hook-up system is subject to continuous changes in the orientation of forces.

During tilting, rotation or inclined lifting phases, the direction of the actions changes progressively and can generate localised dynamic effects on the insert and on the surrounding concrete.

To manage these conditions, the Safelift system uses an articulated hook designed to adapt to the kinematic variations of the manufactured element during handling.

The articulated configuration makes it possible to:

• absorb part of the dynamic actions;
• limit concentrated stresses;
• improve the realignment of forces with the axis of the insert.

This behaviour is particularly important when tilting precast panels, where the lifting system must follow the progressive variation of the load geometry without introducing localised overstress.

Reduced space requirements and integration in the precast manufactured element

One of the distinctive technical aspects of the Safelift system is its reduced space requirement inside the precast manufactured element.

Unlike other systems that require external cavities or large housings, Safelift is designed to be integrated directly into the concrete with limited space requirements relative to the thickness of the element.

This configuration makes it possible to limit local reductions in the resisting section and improve integration in narrow panels or precast elements with complex geometries. The absence of visible external cavities also helps maintain greater surface continuity of the manufactured element.

The system can be installed using an expansion fixing set with spacer, allowing correct positioning in the formwork during production phases. Protective caps also help keep the insert cavity clean during casting and concrete curing.

System versions and behaviour in different handling operations

The Safelift system is available in different configurations designed according to the characteristics of the manufactured element and the intended handling methods.

The geometry of the tube and the behaviour of the system are defined by considering:

• anchoring depth;
• thickness of the precast element;
• pulling method;
• cable inclination.

This configuration allows the system to be used in precast panels, structural elements and manufactured elements subject to tilting or inclined handling, while maintaining control of stresses and continuity of load transfer throughout all operational phases.

Reinforcement and concrete behaviour during lifting

In the lifting of precast elements, the behaviour of the insert is closely linked to the capacity of the surrounding concrete to absorb and distribute the stresses generated during pulling.

For this reason, the Safelift system includes reinforcement configurations designed to improve local confinement of the concrete and the behaviour of the anchorage during operational phases.

The arrangement of the reinforcement helps to:

• control the pull-out cone;
• improve stress distribution;
• limit localised cracking phenomena.

The behaviour of the system must also be checked by considering the concrete strength at the time of lifting, cable inclination and the dynamic effects generated during handling.

These aspects are particularly important in narrow precast panels or in elements handled by tilting, where local actions can be significantly higher than the simple static weight of the manufactured element.

Safelift in lifting systems for precast elements

Within the lifting systems developed by B.S. Italia, Safelift is a solution designed to control hook-up behaviour during the handling operations of precast elements.

The combination of controlled engagement, articulated hook, reduced space requirements and adaptability to different handling operations makes it possible to manage the operational criticalities typical of lifting in systems for precast concrete elements in a more controlled way.

The same category also includes the Torre lifting system, developed to control stresses during stripping and tilting phases of precast panels.