DINA/HiAm

BBR HiAm anchor

BBR DINA anchor

The standard BBR wire stay cables are composed of 7 mm wires of low relaxation grade, with nominal cross-sectional area of 38.5 mm2 and a minimum guaranteed ultimate tensile strength of 1670 or 1770 N/mm2. Typically, the wire bundle is covered with a thick-walled HDPE sheath, and the voids between the wires are filled with a flexible corrosion protection compound. The HDPE-coating is continuous from anchorage to anchorage and can be colored for architectural purposes and fitted with surface treatments for aerodynamic stability.

In the DINA™ anchorage, the wires are individually anchored by means of proprietary BBR buttonheads. The anchorage zone is injected with proprietary DINA™ epoxy compound, which prevents fretting and the ingress of air or moisture and improves the fatigue resistance of the anchorage. The stressing sleeve facilitates the stressing of the anchorage, with the cable force being transferred by means of a lock nut to the bearing plate.

In the HiAm™ socket, the wires of the cable are spread out and are anchored by means of mechanically formed BBR buttonheads. The spaces between the wires in the anchorage cone are filled with a proprietary HiAm™ compound. Lock nuts screwed on to the HiAm™ socket transfer the cable loads to the supporting bearing plates. Alternatively to a lock nut, shims may also be used.

The lock nut or the shims allow for a length adjustment of the stay cable during stressing. Hence, additional stressing and de-stressing operations of already installed and stressed stay cables can be performed on the whole bundle of wires. Protection caps filled with a special corrosion-inhibiting compound protect the anchorages.

The choice of anchorage is mainly governed by economics and manufacturing considerations and the following gives an indication of the typical sizes:

• DINA anchorages for small to medium size cables (between 13 and 241 wires)
• HiAm anchorages for medium to larger cables (between 56 and 499 wires

DINA™ and HiAm™ anchorages both exhibit very high fatigue strength, which is an essential requirement for stay cables. All anchorage components are designed to withstand the nominal ultimate breaking load of the strand bundle with adequate safety. The BBR wire stay cable systems fulfilled all anchorage performance tests that have been performed according to the recommendation of various international codes and guidelines.

BBR wire stay cables are completely prefabricated, installed and stressed as a complete unit, which results in the highest possible quality control of the cable and fastest possible cable erection cycle on the construction site.

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