General Information

Figure 1 shows a cable-stayed bridge that is used by motorcycles, bicycles and pedestrians.

Cable-stayed bridge.
Cable-stayed bridge over a river.
Type Single-span cable-stayed bridge
Main span ≅ 125 m
Deck width ≅ 1.5 m
Girder Steel twin I-girder
Pylon Reinforced concrete (A-longitudinal shaped)
Stay cable arrangement Radial (two cable planes)

Coating

Figure 2 shows a stay cable in the main span region.

Stay cable.
Coated stay cable and coated U-bolt clamps.

Stay cable and U-bolt clamps are coated with grease.

  • What are some possible reasons for coating stay cables and U-bolt clamps?
  • Figure 3 shows the anchorage region.

    Anchorage region.
    Anchorage region.

    Stay cables, turnbuckles, additional cables, and U-bolt clamps are coated with grease. Two coated turnbuckles are shown in figure 4.

    Coated turnbuckles.
    Two turnbuckles coated with grease.

    The coat layer is about 5 mm thick.

  • What are some advantages and disadvantages of the above shown coating?
  • Figure 5 shows the bottom sector of the anchorage region.

    Anchorage region.
    Cables embedded in concrete.

    The additional cables are embedded in concrete. Non-coated cable regions near the concrete surface are noticeable.

  • What are some possible reasons for the non-coated regions?