DYWIDAG-SYSTEMS INTERNATIONAL
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Hong Kong: The Kap Shui Mun Bridge, DSI Services Supply and installation of DYWIDAG stay cables with bond socket 61 to 108-0.62", a total of 176 stays.

Stay Cable Systems

DYNA Bond® Anchorage

The DYNA Bond® Anchorage consists of a conical steel pipe (bond socket), supporting a wedge plate where the strands are anchored with 3-part-wedges. A ring nut is fitted on a threaded end of the bond socket and distributes the cable force through a bearing plate into the structure. During the construction phase prior to grouting the bond socket, all the applied loads are supported directly by the wedges.

After filling the bond socket with cement or epoxy grout, all additional loads (including dynamic loads from traffic, vibrations and earthquakes) are then partly resisted by the wedges and partly transmitted by the bond between the strands and the grout via the bond socket directly to the bearing plate and the supporting structure (only the bond socket needs to be grouted to achieve the behavior described above).

DYNA Bond® Anchorages have an excellent fatigue resistance because the bond action in the bond socket substantially reduces the magnitude of the dynamic loads reaching the wedge anchorage. Fatigue tests have proven that a stress range of up to 240 N/mm2 (upper stress 0.45 GUTS) may be safely resisted for over 2 million cycles.
 

Blautal bridge in Ulm, Germany, DSI Services Supply and installation of 8 C27 DYNA Bond Stay Cables.

Additional advantages of the DYNA Bond® Anchorage:

  • redundant load carrying system.
  • reliable corrosion protection for the sensitive anchorage area because all voids in the anchorage zone are filled with a stable and robust filler.
  • enhanced fire resistance and protection against vandalism, impact loads, and blast effects.

A further important construction detail is the use of an elastomeric bearing at a certain distance away from the anchor block. The most important requirement for the design of the bearing is to prevent the introduction of harmful bending in the anchorage area. Because the injection of the grout extends beyond the bearing the DYNBA Bond® Anchorage provides a clear statical system for absorption of bending loads due to lateral cable movements (cable rotation).

The bearings are dimensioned such that not bending loads that would be harmful to the anchorage are introduced into the anchorage area.

 

DSI DYNA® Bond Anchorage
DSI DYNA® Bond Anchorage Schema drawing
  1. Wedges
  2. Spacer
  3. Ring Nut
  4. Filling Material
  5. Strands
  6. Elastomeric Bearing
  7. Cap
  8. Wedge Plate
  9. Bearing Plate
  10. Bond Socket
  11. Recess Pipe
  12. Boot
  13. HDPE Sheathing
       DYNA Bond®  Anchorage (forces calculated with strands 0,62" St 1670/1860)
      cable typeDB-P12DB-P19DB-P27DB-P37DB-P48DB-P61DB-P75DB-P91DB-P108
      No. of strands1219273748617591108
      Forces [kN] 
      ultimate load (GUTS)3,3485,3017,53310,32313,39217,01920,92525,38930,132
      working load (0.45 x GUTS)1,5072,3853,3904,6456,0267,6599,41611,42513,559
      Dimensions [mm] 
      A - bearing plate300370430500580640715780855
      B - thread**125133142154170175195215235
      C - bearing plate5060708090100110120130
      D - ring nut90100110120135150170190210
      ØR - ring nut244287326378434480536584636
      ØT - recess pipe219245299324394419470508559
      ØP - HDPE Sheathing110140160180200225250280315

      *standard length, can be supplied longer on special request.

      The values are based on the German Code (DIN). Adaptations to other code systems or concrete strengths (e.g. ASTM, BS, etc.) are possible.

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