International Symposium on Mitigative Measures against Snow ...

<strong>International</strong> <strong>Symposium</strong> on Mitigative Measures against Snow Avalanches
Egilsstaðir, Iceland, March 11–14, 2008
3.2 The mesh
The light mesh (21) is mounted to the vertical posts and reinforced by wires (24) along the
four rims. The principle securing of the mesh is shown in Figure 6. The wires goes through
the cable eyes (7) on the top of the posts, down through the eye and fork connection (8) of the
end posts and through the eyes of the adjusting bolts (4) at the foot of the posts. The wires are
secured with wire clamps (25). The top wire was fixed in both ends to the rebar bolt of the
end, either directly or via a strut with eye nuts fixed in the cable eye of the end posts (Figs. 2 & 6).
21
7
Figure 5 The bearing top wire of the mesh goes through a cable eye to the rock anchor.
Figure 6 Details of tendons anchored by turnbuckle and fork, and wires to eye nut and bolt.
The mesh is fixed to the wires with clips (26) with defined strength. The mesh may normally
have a ground clearance depending on the potential hazard of shallow snowpacks at the actual
locations of the retention structures. In the protection area a ground clearance varying from
20−100 cm was recommended. There was in fact no need for special adjustments due to
uneven terrain. The height of the actual meshes where 1.5 m and 2 m respectively (Table 2).
Table 2 Mesh and wire - Accessories
no Type Dimension (mm)
21 Mesh 1x1500 / 2x1000
22 Mesh size 80x100 / 50x70
23 Mesh gauge 3.0 / 2.2
24 Wire gauge 10-12
25 Wire clamp 10-12
26 Wire rope clip
56 Light rockfall prevention mesh used as retention structure
25
7
26
8