WIRE TENDONS AND MATERIALS
The part that transfers the load from the anchor to the top termination.

Galvanized Steel
The wire is manufactured to BS3530 or BS302. Tensile strength 1770N/mm2 and hot dipped galvanized (minimum coating type Z 20gm/mm2). Obtaining this type Z galvanizing is not easy and therefore generally galvanizing type A can be accepted as the norm (30gm.mm2), further enhancing corrosion resistance. This means that reasonable amounts of corrosion must occur before the steel wire is exposed.

Plastic Impregnated Steel
A composite solid section of a “herringbone construction”, 7x7 galvanized high tensile steel wire tendon and black ultraviolet inhibited polyethylene. The herringbone construction has long been known in the industry. The effect of an opposite helix of wires in adjacent strands creates channels of space through to the inside of the tendon. This enables deep impregnation of polyethylene between the strands, with the polyethylene locking the cover through the interstices of the tendon, preventing the covering from stripping off the tendon in the event of damage. It also reduces capillary action and creep corrosion from water entering the tendon, if damage to the covering penetrates through to the steel wires.

Stainless Steel

All stainless steels have two common features. They all contain a minimum of 12% chromium and they are all extremely resistant to corrosion. Stainless steel is not made up of one specific element but a number. The grades 304 and 316 stainless steel with their excellent mechanical properties and high resistance to stress corrosion in adverse atmospheres are the only classes of stainless steel we use for tendons.

The table below shows the Minimum Breaking Load (MBL) of wire tendon assembly using different terminations.



In Australia the Bat range of anchors are used with steel rod, available in stainless steel, HT steel, or galvanized.

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