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© Geobrugg Gruppe, CH-8590 Romanshorn, Switzerland
Maintenance manual RXE, GBE / 09
4
CRITERIA FOR REPAIR AND REPLACEMENT
If the functional efficiency or load-bearing capacity of the components is reduced as a result of damage or
corrosion, such that the minimum required safety factors can no longer be fulfilled, the components must
be replaced.
4.1
Debris in the barrier
Any debris that accumulates in the barrier should not exceed a maximum of a third of the usable height.
Routine clearing of the barriers is essential to ensure unimpeded functioning.
4.2
Remaining usable height following an incident
The remaining usable height of the barrier following an incident is an initial indicator of the level of damage that has
occurred. Clear sagging of the support rope or the net and a significant change in the angle of the posts indicate
an elongation of one or more U-brakes, which may need to be replaced.
4.3
U-brake
In the course of the EOTA certification tests, depending on their installation position the U-brakes became elongated
to varying degrees. Accordingly, following several minor incidents their energy absorption capacity for a subsequent
maximum incident varies.
Type
Maximum Elongation
U-150
30 cm
U-300
60 cm
U-400
80 cm
If the initial elongation exceeds this value, the brake must be replaced. Once the U-brakes have become elongated,
the usable height of the barrier has decreased. By re-tightening the support ropes, the usable height can be restored
to its original value.
4.4
Meshes and nets
Even in the case of distorted wires or strands, as a rule it is not necessary to replace whole fields.
4.4.1
TECCO
If there are compressed, heavily distorted or torn mesh loops, these areas should be repaired.
4.4.2
SPIDER
If there are compressed, heavily distorted or superficially or completely torn mesh loops, these areas should be
repaired.
4.4.3
ROCCO
If individual wires have slipped out of a clip, they should be secured with a wire rope clip of a suitable
size.
