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Cable stay

Cable-stayed bridge is a bridge similar to suspended bridge in that it has towers and a deck that is held by cables, but its cables hold the deck by connecting it directly to the towers instead via suspender cables. It usually carries pedestrians, bicycles, automobiles, trucks, and light rail. It is used in places where spans need to be longer than cantilever bridge can achieve (because of its weight), but the span is short enough so a suspension bridge is not practical there economically.

The progress of Stayed Bridges has followed the need for bridging larger spans more economically and to the concept of magnificent land marks that these kinds of bridges introduce in the infrastructure networks.

Progress equates with the developments in structural analysis and it has been followed by the improvement of Cable Stays since the renaissance of the cable stayed bridge typology in 1955

Our contribution

MK4 has been involved since its creation with the design and installation of cable stays for bridges and all kind of diverse stayed structures.

MK4’s staff, with more than 25 years’ experience in cable stays, together with DMK Stay have developed the DMK parallel strand stay system that fulfils the most demanding project requirements.

DMK Stay

The DMK Stay belongs to the latest parallel strand cable stay generation. Stay is based on a bundle of self protected prestressing strands that run inside a global polyethylene duct. Strands are anchored through the wedge system in the DMK anchor heads.

The following premises have been taken into consideration for the DKM Stay design:

  • Stay behaviour according to the most relevant international recommendations.
  • Durability.
  • Wide size range.
  • Easiness of installation.
  • Unitary stressing (strand by strand).
  • Adjustable anchorages for full stay stressing or distressing.
  • Force checking or monitoring at any time.
  • Replacement of the stay, as a whole or each strand individually.
  • Prepared for damper installation.
  • Adaptable for special solutions

Test

Stay anchor heads have been tested according to the PTI Recommendations for Stay Cable. Design, Testing and installation and have achieved the following successfully:

  • Dynamic behaviour: 2 million cycles, 200 N/mm2, upper load limit 45% GUTS.
  • Static efficiency: 95% of GUTS (Guarantied Ultimate Tensile Strength).
  • Standard sizes are composed of 7 to 127 strands with 0.6” diameter.
  • The strand to be used can either be 15.2 or 15.7 mm. nominal diameter.

Basic stay is fully sealed to avoid the entrance of water inside and comprises at least 4 protective barriers to the steel of the strands at any point, this warrants the maximum durability of the tensile element against corrosion.

DMK Stays are encapsulated forming one sealed unit.

This configuration permits to disassemble all the components of the stay without modifying the existing structure. Also, strands can be removed or replaced one by one if required.

They are linked to the structure only by the bearing of the anchor head nuts to the repartition plates of the structure, the neoprene centralizers at the exit of the guide pipes and at the damper clamp, in case that option is used.

This configuration permits to disassemble all the components of the stay without modifying the existing structure. Also, strands can be removed or replaced one by one if required.

MK4 Canada Products