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RFN-YALLOURN-12-06-16

TRUENERGY UNDERTOOK THE HEIGHT SAFETY SERVICES OF ABSAFE RECENTLY TO ADDRESS ISSUES FACING THEIR AGEING CHIMNEY STACKS AT YALLOURN POWER STATION IN VICTORIA’S GIPPSLAND REGION.

Chimneys at the coal fired power station have begun developing concrete cancer whereby the steel reinforcing corrodes and the overlying concrete begins to flake and fall off. Due to the extreme height of the structure, in excess of 170m, even small particles dislodging have the potential to injure people working below.

To ensure flaking and falling concrete were contained, a solution that encapsulates the affected areas of the chimney was required. Lightweight rockfall mesh was selected as it could be installed using industrial rope access (abseiling).

The mesh was selected as it has the unique double twist – meaning, high strength with virtually no weight penalty. The mesh was also selected because of its excellent corrosion protection being coated with a zinc aluminium coating which is then overlain by a PVC over coating – an absolute essential in the highly corrosive environment.

The mesh was fixed in position using stainless steel rigging connections and wire rope throughout. It was a strict design criterion that the mesh remained tightly coupled to the surface of the chimney, so 8mm cables were strung across the mesh at 1500mm centres to keep the mesh snug against the surface, thus keeping any dislodged materials in place for later retrieval.

So successful was the project that the client has opted for the same approach for future remediation works.

The images below are other examples of recent rockfall control installations in Australia

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