Anti-collision tower cranes/mobile cranes – Eole shipyard – Bouygues Construction


The construction of the Eole Porte Maillot station involves 4 tower cranes and for some lifting operations mobile cranes are present on the site.

Moreover, the site being very limited in terms of surface area, the mobile cranes are most often in interference with the tower cranes.

The 4 tower cranes are equipped with a conventional anti-collision system which does not take mobile machinery into account.

On several occasions, there have been collisions between tower cranes and mobile cranes resulting in all lifting operations being shut down for several days.

System set up

For Mobile Crane

The mobile crane is equipped with 2 RTK.42 centimetric geolocation systems. A tablet is also set up to allow the crane operator to visualize the position of his machine and that of the tower crane.

The first RTK.42 is magnetized to the boom head of the mobile crane. The second RTK.42 is magnetized to the counterweight.

For tower crane

An RTK.42 centimeter geolocation sensor is magnetized to the block of the tower crane. A tablet is placed in the crane operator's cabin to allow him to see the positions of the various machines in real time.

The tablet will also alert the crane operator when the approach is too close by a sound and light signal.

3D management of zones to promote productivity

Due to the proximity between the cranes, the system manages in 3D the prohibition zones around the dangerous elements of the machines.

A sufficient area below the tower crane hook is determined with the site manager. Thus, the overflight of the mobile crane by the tower crane is allowed as long as the tower crane hook is high enough in relation to the geometry of the mobile crane.

Danger zones around machinery

Visualization interface


  • 0 accidents
  • Adoption by crane operators
  • Validation of the simplicity and speed of installation.

Installation with 5 minutes of immobilization per gear. Furthermore, the mobile crane has been changed several times. The site team present during the first installation was able to take care of the uninstallation and reinstallation of the system on its own.