TUBOSIDER

Technical features of the TUBOSIDER components:
POSTS: steel closed tubular section profiles
BASE PLATES: shaped and welded steel plate
ANCHORAGE PULLY: shaped and welded steel plate
ANCHORAGE PLATE: shaped and welded steel plate
BOLTS: bolts M20 x 100 TDE
WIRE ROPE NET: ring net constructed by independent rings formed by a continuous wire
DOWNSTREAM BRACING CABLE: steel wire rope strand type
UPSTREAM BRACING CABLE: steel wire rope strand type
LATERAL BRACING CABLE: steel wire rope strand type, steel core
LATERAL NET JUNCTION CABLE: steel wire rope strand type
LONGITUDINAL TOP CABLE: steel wire rope strand type
LONGITUDINAL BOTTOM CABLE: steel wire rope strand type, steel core
INTERMEDIATE NET JUNCTION CABLE: steel wire rope strand type
DOWNSTREAM POST BOTTOM FIXING CABLE: steel wire rope strand type
UPSTREAM POST BOTTOM FIXING CABLE: steel wire rope strand type
ANCHORAGE/ PULLY CABLE: steel wire rope strand type
SHAKLES WITH SCREW PIN: minimum tensile strength 100.0 kN.
FRICTION BRAKES: plate: shaped and welded steel plate
CLAMPS: for the ropes diameter 26, 22, 12 mm; steel grade Fe 430
THIMBLES: thimbles for the ropes diameter 22 mm

Tested energy, global load, and relevant deflection for the analysis of the fence in subject, we have considered the technical data issued by the magazine "Rock Mechanics and Rock Engineering" ( 1998 ) 31 (1). \ -24- Title of the article "Evaluation of Behaviour of Rock fall Restraining Nets by Full Scale Tests". This document describes the technical features of the "crash test" carried out on real size structures and also the technical features of tested barriers. The test for an energy of 3000 kJ has been carried out on a rock fall barrier with a total length of 30 m.; center to center posts distance of 10 m, height of the barrier of 6 m.(interception height measured on the post) height of the net 7 m. By the crash-test carried out by Politecnico of Torino (certificate 96/ of 09/12/96), the kinetic energy produced was of 3027 kJ ; this impact (stopping the rock block) has produced a final deformation in the structure of 14 m, the big deformation due to the breaking of the bracing cable system, allowed anyway to stop the boulder. To estimate the loads on the components we consider a deformation of 6 m (the same size of the height of the net). From the diagram it is possible to dimension the medium load acting on the barrier during the impact [Fm]
Fm = kinetic energy / max displacement