Parallel Steel Wire Stay Cable System of Cable-Stayed Bridge

Features：

Parallel steel wire stay cable mainly includes: cable body, cold cast anchors at both ends, waterproof cover, shock absorber, etc.

1. Prefabricated in the factory, the product is shipped in the form of a finished cable with anchor and cable body integrated into one.

2. Transported in the form of an integral coil packaging.

3. The overall tensioning and tensioning tonnage are clear, the cable force is uniform, and the cable adjustment is convenient.

4. A full range of supporting products, such as external nippers, force sensors, etc.

Parallel steel wire stay cable system mainly includes: cable body, cold cast anchors at both ends, waterproof cover, shock absorber, etc.

Structural diagram:

Technical parameter table of cold cast steel wire anchor cable with diameter of Φ5 and σb=1670Mpa.

Technical parameter table of cold cast steel wire anchor cable with diameter of Φ7 and σb=1670Mpa.

The steel wire rope body adopts a fully anti-corrosion structure. The rope body is composed of Φ5, Φ7 hot-dip galvanized (or epoxy, etc.) high-strength steel wires arranged closely in regular hexagons or missing-corner hexagons, parallel and bundled into bundles by special rope-making equipment, and then wrapped and shaped with high-strength polyester wrapping tape after left-handed light twisting, and then hot-extruded HDPE protective layer for protection, and finally planted and marked according to the stress-free length of the stay cable.

The protective layers include: H-type black single-sheath structure, C-type black inner layer and colored outer double-sheath structure, and FD-type triple-sheath structure with isolation layer.

Galvanized steel wire cable:

Epoxy sprayed steel wire cable: 

Epoxy sprayed steel wire is a new type of prestressed high-strength steel wire material with better anti-corrosion performance than galvanized steel wire.

Its advantages are:

1. The coating has strong adhesion and excellent chemical properties such as alkali resistance, acid resistance and solvent resistance;

2. The coating process does not affect the strength of the steel wire and other properties. The epoxy steel wire has better grip than galvanized steel wire.

Low stress anti-corrosion steel wire rope cable: 

The rope body is fully anti-corrosion with double-layer HDPE protection, and an isolation layer is added between the double layers of HDP. When the rope body is subjected to static load, the outer layer of HDPE can effectively release stress, so that the outer layer of HDPE always works in a low stress state, effectively solving the problem of HDPE stress cracking.

Cold cast anchor: 

Structure diagram of cold cast anchor at adjustable end and fixed end：

Note: 1. The opening in the middle of the anchor plate has the same inner diameter as the embedded pipe;

          2. When calculating the anchor length of the cable, place the fixed end nut in the middle of the fixed end anchor cup L2;

          3. When calculating the anchor length of the cable, place the tension end nut at a distance of (L1-H1)/2 from the inner end face.

The reasons for the vibration of stay cable bridges：

The stay cable is a slender rod component, which is easily vibrated by external forces such as vehicles, wind and rain. Vibration can cause damage to the cable, and it needs to be suppressed to prevent this damage from affecting the safety of the bridge.

Adding structural dampers to inclined cables is the most effective method for vibration reduction.

The methods of shock absorption include:

1. Installing high-performance dampers inside the pre embedded pipe of the cable, using high damping rubber to dissipate energy and reduce vibration, and improving the anti vibration ability of the cable.  

2. The outer protective layer of the cable adopts a double helix sheath, which can effectively suppress the wind and rain induced vibration phenomenon of the inclined cable, reduce the vibration amplitude and probability of wind and rain induced vibration of the cable.  

3. Adopting an external permanent magnet adjustable magneto rheological damper or viscous damper, the damper is mainly designed to reduce the vibration of the cable, which can more effectively reduce the vibration of the cable caused by external forces.

Packaging：

1) All the products are packed with seaworthy packing.
2) Customer's special requirement for packing can be satisfied.
3) Air freight, sea freight and truck freight are all available.