DINA/HiAm
Wire stay cable systems
The standard BBR wire stay cables are composed of 7 mm wires of low relaxation grade and a minimum guaranteed ultimate tensile strength of 1670 or 1770 MPa. 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.
DINA anchorage configuration
DINA anchorage configuration
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.
HiAm anchorage configuration
HiAm anchorage configuration
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.
Choice of anchorage
Choice of anchorage
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
High fatigue resistance
High fatigue resistance
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.
Prefabricated
Prefabricated
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.
400 reasons to choose the BBR Network
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Fifty years – 400 structures
While many cable suppliers only built their first major cable supported structure in the late 1970’s and early 1980’s, the BBR Network installed the first stay cables in the late 1950’s. Since then, BBR Stay Cable Technology has been applied to over 400 major structures around the world – including Japan’s breathtaking Tatara Bridge which has the longest main span to be constructed in the 20th Century.