The virtual museum of stories through images

Home > Stories > Mine Gianna: a jump back in history - Page 12/28

Mine Gianna: a jump back in history

Swellex tie-rods
Swellex tie-rods
© Archivio Ecomuseo delle Miniere e della Val Germanasca (Photo: Serena Maccari)
To assure the unstable blocks of rock they inserted " tie-rods" similar to nails, at the end of which an umbrella opening device granted the anchorage of the block to the wall. They were fixed outside with iron plaquettes.

The currently used models (Swellex) exploit the same principle but they are inflated, and expanded thanks to a jet of pressured water once they are turned on. Thus traction is exerted from inside the tie-rod.
The images and texts contained in the site are subject to copyright. Any use of these materials outside the site is subject to authorisation by the owners.