Introduction
The document introduces the Hélicrab spiral staircase system, patented by Entrepose échafaudages, designed for worksites with limited space. It highlights the system's small footprint, lightweight components, and compatibility with the Crab system.

Specifications
- Footprint: 1.50 m x 1.50 m
- Maximum load: 2 kN/m²
- Maximum top landing height: 24 m (solutions available for greater heights)
- Compatible with Multicrab system
- Access possible every 0.50 m

Components and Weight
The document lists the components required for a 4.00 m standard staircase, including fixed baseplate screw jacks, ledgers, guardrails, and more. The total weight of the components is 677 kg, divided into Crab system components (334 kg), Hélicrab components (197 kg), and cradle weight (146 kg).

Installation and Safety
The Hélicrab system offers easy and safe access according to EN 12811-1 standards. It includes features like portable flights of staircase, collective protection for erection and dismantling, and erection trapdoors for safety. The staircases can be erected between scaffolding towers or attached to facade scaffolding.

Applications
The staircases can be used in various configurations, such as attached to buildings with different exit options or installed inside shafts. They are suitable for narrow spaces like streets or courtyards and can be adapted to access different floor heights.

Storage and Transport
The system includes a storage handling rack with a maximum working load of 5 kN. The components are designed to be lightweight for easy manual erection and can be transported using a 6.50 m flatbed.

Limitations
The document specifies the maximum load and height limitations, emphasizing the importance of adhering to these constraints for safety and efficiency.

Conclusion
The Hélicrab spiral staircase system is a versatile and efficient solution for worksite access, offering numerous configurations and safety features while maintaining a compact design.