International Symposium on Mitigative Measures against Snow ...

3. PRINCIPLE DESIGN
<strong>International</strong> <strong>Symposium</strong> on Mitigative Measures against Snow Avalanches
Egilsstaðir, Iceland, March 11–14, 2008
3.1 The Posts
The principle design and foundation of the square steel hollow posts are shown in Figure 4.
Some adjustments of the tabulated accessories are acceptable on the assumption that the
structure retains its strength properties.
The bracket at the foot of the post made of a channel section (3) and the eye and fork
connection (8), are both flare welded to the posts. All end poles have additional eye and fork
connection and struts (13) in the line of the mesh (Fig. 5).
The eye bolts (4) and channel section (3) on the posts were originally dimensioned to take the
shear forces and keep the posts to the ground. However, the dowel (2) and pipe clamp (6)
made it much easier to even the top line of the posts across uneven terrain. The selected
solution requires a heavy clamp for supporting the post.
The adequate dimension of struts (rolled thread bar) and connecting accessories are
OD16 mm, while the rebar bolt should be minimum OD20 mm. However, the whole system
may as well be done in OD20 mm. The inclination of the strut may vary between 45 o − 60 o .
no Type
Accessories
Dimension (mm)
1 Post 50x50x4, L=2000
60x60x4, L=2500
70x70x4, L=3000
2 Dowel, rebar OD20
3 Channel section INF100, L=50
4 Tread bar with OD20
eye nut
OD20
5 Nut OD20
6 Pipe clamp
7 Cable eye
8 Eye and fork
connection
9 Flare welded
ear: min. 8 mm
10 Bolt and nuts min. OD16
11 Turn fork or
eye nut/eye bolt
OD20
12 Turnbuckle OD20
13 Strut,
rolled thread bar
OD20
14 Coupler OD20
15 Rock anchor,
rebar
OD20, L=800
Figure 4 Principle design and anchoring of the square steel hollow posts. The accessories
were made in galvanized steel and dimension OD20.
Hestnes and Valstad 55