Televes M550XL Instrucciones De Montaje página 20

M550XL TOWER
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8.2 Anchor fundation plate
8.2.1 Footing calculation Ref. 314501 / 354511
A.- Footing area in m²= 1m² / 2,25 m²
ð.- Ground density; ( entre 13000 y 18000 N/m³, depending on the ground and
its compaction)
µ.- Coefficient of friction (footing with the ground). Suppose µ=0,5)
TV.- Vertical component guys uplift force in N
TH.- Horizontal component guys horizontal force in N
CS.- Security coefficient
h.- Depth at which the footing is buried
Tmax.- maximun traction capacity of the anchor fundation plate. = 55 000 N
CHECKS:
Traction force- CS*( TV²+ TH²)½ < 55 000 N
Uplift check- CS * TV < A* h * ð
Displacement- CS * TH < A* h * ð * µ
Note.- The CS safety factor is normally taken as a minimum of 1.25, so the foo-
ting Ref.314501 / 354511 will support a maximum a maximun force of 44 000
N. In any case, the safety factor will always depend on the risk of the installation.
Once the footing is buried, it will begin a process of corrosion that will depend
on the acidity or alkalinity of the soil, humidity, possible potential differences
between the plate and the soil, etc.
It is therefore very difficult to quantify the speed at which the different resistant
sections will be reduced, which is why we do not recommend this type of an-
chorage in permanent installations.