DYWIDAG Multistrand Stay Cable Systems Alamillo Bridge, Sevilla, Spain 28 DYNA Bond® Stay Cables Maximum Cable Length: 292 M Cable Size: DB-E61
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DYWIDAG Multistrand Stay Cable Systems Alamillo Bridge, Sevilla, Spain 28 DYNA Bond® Stay Cables Maximum cable length: 292 m Cable size: DB-E61 Pitt River Bridge, Vancouver, Canada 96 DYNA Grip® Stay Cables Maximum cable length: 99 m Cable sizes: DG-P31, DG-P61 Gajo Arch Bridge, Geoje City, South Korea 80 DYNA Grip® Stay Cables Maximum cable length: 31 m Cable size: DG-P12 La Plata Bridge, Puerto Rico 96 DYNA Bond® Stay Cables Maximum cable length: 90.1 m Cable sizes: DB-P27, DB-P37 Ziegelgraben Bridge, Germany 32 DYNA Grip® Stay Cables Maximum cable length: 176 m Cable size: DG-P37 North Avenue Bridge, USA 24 DYNA Grip® Stay Cables Maximum cable length: 26 m Cable sizes: DG-P19, DG-P31 General Content Page 2 References Page 3 General Cable stayed bridges are very efficient Quality Assurance structural systems with light weight DYWIDAG Stay Cables superstructures and large lever arms. Page 4 DYNA Bond® Anchorage The most important elements of Page 6 DYNA Grip® Anchorage these aesthetically pleasing and often Page 8 Clevis Anchorage for DSI Stay Cables dramatic structures are the closely Page 10 Strands, Wedges and Corrosion spaced stay cables which transfer the Protection loads to the foundation via the pylon. It Slim Duct is essential that these tensile elements Outer Sheathing are durable and easy to maintain. They Bearings and Dampers are generally designed to be restressa- Page 11 Saddle ble and replaceable. Page 12 Tests — Installation Page 13 Stressing DYWIDAG has been involved in the DSI Services development, construction and Page 14 DYNA ForceTM Elasto-Magnetic Sensor execution of stay cables and cable Page 15 Quality Assurance supported structures since 1970. Practical Applications Page 16 Special Solutions Based on internationally recognized DYNA Grip® Anchorage guidelines for stay cables combined with Epoxy Coated Strands with our own design criteria of the DYWIDAG Extradosed Tendons world wide renowned DYWIDAG Page 18 Stay Cable Jacks Multistrand tendons, we first developed Page 20 References stay cables with bars and applied them Page 24 Addresses for large bridges (for example the Dame Point Bridge, Florida USA; main span DSI maintains an internal quality control Maumee River Crossing project/USA, 396 m). test lab in Germany for in-house testing where DSI developed a cable with up of geometry, material and performance. to 156 strands. This cable is the largest Afterwards, we were able to take in the world and has been proven advantage of our many years of successfully in static, dynamic and leak experience and expertise in post- tightness tests. tensioning and prestressed concrete construction, particularly in the field of To meet market demands and long span bridges. requirements of international standards, DSI provides stay cables with two DYWIDAG Multistrand Stay Cables basic types of anchorages: were developed in the eighties to accommodate ever increasing spans – DYNA Bond® Anchorage and the resulting need for economical – DYNA Grip® Anchorage high capacity cables. Today, strand cables are widely used for many types The DYNA Bond® Anchorage is an of structures. This brochure provides an anchorage with additional internal overview of DYWIDAG Multistrand Stay bond. It is normally grouted after Cable Systems.The special use of stay application of the permanent loads of cables for extradosed tendons is also the superstructure. included. More detailed information is available on request. The DYNA Grip® Anchorage is an anchorage without bond that permits monitoring and replacement of Quality Assurance individual strands of a stay during its entire service life. To ensure high quality and conse- DYWIDAG Stay Cables DYWIDAG Stay Cables are designed quently, the performance and durability according to acknowledged of DYWIDAG Stay Cables, all international requirements e.g. components are subjected to quality DYWIDAG Stay Cables are normally PTI, fib or CIP/Setra. tests according to our quality available in standard sizes up to assurance system. DSI is ISO 9001 109 strands per anchorage. This certified. maximum size was extended for the 3 Spacer Wedges Ring Nut Filling Material Strands T X R A X Bearing Plate D C Cap Bond Socket Wedge Plate B ® DYNA Bond Anchorage the dynamic loads reaching the wedge n easy fixation of half shells directly anchorage. Fatigue tests have proven on the grouted PE sheathing for the that a stress range of up to 240 N/mm2 connection of external dampers The DYNA Bond® Anchorage consists (upper stress 0,45 GUTS) may be safely of a conical steel pipe (bond socket) resisted for over 2 million cycles. Another important construction detail is supporting a wedge plate where the the use of an elastomeric bearing at a strands are anchored with 3-part- Additional advantages of DYNA Bond® certain distance away from the anchor wedges. A ring nut is fitted on the Anchorages: block. The most important requirement threaded end of the bond socket and for the design of the bearing is to distributes the cable force through a n redundant load carrying system prevent the introduction of harmful bearing plate into the structure. During bending in the anchorage area. the construction phase prior to grouting n reliable corrosion protection for the the bond socket, all the applied loads sensitive anchorage area because all Since the injection of the grout are supported directly by the wedges. voids in the anchorage zone are filled extends beyond the bearing, the with a stable and robust filler DYNA Bond® Anchorage provides a After filling the bond socket with clear statical system for the absorption cement or epoxy grout, all additional n enhanced fire resistance and of bending loads due to lateral cable loads (including dynamic loads from protection against vandalism, movements (cable rotation). traffic, vibrations and earthquakes) are impact loads and blast effects then partly resisted by the wedges. They are then partly transmitted by 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 behaviour described above). DYNA Bond® Anchorages have an excellent fatigue resistance because the bond action in the bond socket substantially reduces the magnitude of 4 Kap Shui Mun Bridge, Hong Kong DYNA Bond® Anchorage Elastomeric Bearing P X HDPE Sheathing Recess Pipe Boot DYNA Bond® Anchorage (forces calculated with strands 0,62" St 1620/1860) Cable type DB-P12 DB-P19 DB-P27 DB-P37 DB-P48 DB-P61 DB-P75 DB-P91 DB-P108 No. of strands 12 19 27 37 48 61 75 91 108 Forces [kN] ultimate load (GUTS) 3.348 5.301 7.533 10.323 13.392 17.019 20.925 25.389 30.132 working load (0,45 x GUTS) 1.507 2.385 3.390 4.645 6.026 7.659 9.416 11.425 13.559 Dimensions [mm] bearing plate A 300 370 430 500 580 640 715 780 855 bearing plate C 50 60 70 80 90 100 110 120 130 thread* B 160 170 180 190 205 220 240 260 280 ring nut D 90 100 110 120 135 150 170 190 210 ring nut Ø R 244 287 326 378 434 480 536 584 636 recess pipe Ø T 219 245 299 324 394 419 470 508 559 HDPE sheathing Ø P 110 125 160 180 200 225 250 280 315 * standard length, larger lengths can be provided upon special request Subject to modification 5 Compression Tubes Sealing Plates Ring Nut Spacer Wedges Compression Plate R A X Bearing Plate Strands Cap D C min L Anchor Block B DYNA Grip® Anchorage Special features of DYNA Grip® An exchange of single strands can thus Anchorages: be performed directly at the anchorages Project specifications often require without traffic limitations. individual strands of stay cables to be n the factory applied corrosion inspectable and, if necessary, protection of the PE-coated strands Similar to the DYNA Bond® Anchorage, replaceable. For these requirements, continues directly up to the wedges. an elastomeric bearing is installed at a DSI developed the DYNA Grip® This significantly reduces the space certain distance from the anchor block Anchorage, providing the opportunity to in the anchorage which is to be filled to reduce the bending stresses in the inspect individual strands without with corrosion protection compound strands caused by cable rotation. damaging the stay cable and to replace and therefore improves durability. strands, if necessary. A clamp, installed after stressing on the n an exact cutting to length of the strand bundle, keeps the strand in a The DYNA Grip® Anchorage consists of strands and removal of the PE coat- compact hexagonal pattern and acts as an anchor block in which the strands ing is not necessary. Using special support for the elastomeric bearing. The are anchored by 3 part-wedges with equipment, the PE-coating is drawing above shows a version that is high dynamic performance. A ring nut removed by using a DSI developed able to accommodate construction is threaded on the anchor block to and patented procedure during the tolerances between the cable axis and transmit the cable force via the bearing first stressing. In cases where subse- the axis of the recess pipe. Other details plate into the structure. A steel pipe quent stressing actions are neces- are also used. which incorporates centering and sary, the remaining PE-coating is sealing provisions for the strands is compressed by the compression welded to the anchor block. tubes, held by the wedges, while the strand is pulled through and Fatigue tests have proven a dynamic elongated by the jack. stress range of up to 200 N/mm² (upper stress 0,45 GUTS at 2 million load cycles n restressing and replacement of with 0,6° inclined anchorages).