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Cable binding and fixing in vertical shaft cable trays

Cables in vertical shaft trays can be secured using binding tape, hooks, ladder or spiral tracks, often combined with hoisting devices for heavy or large cables.Common Binding Methods
  1. Binding Tape Method Cables are threaded and secured with binding tape directly to the inner wall of the tray or shaft. This method is simple and quick but is generally suitable only for smaller or lighter cables due to limited load capacity and risk of slippage when used with heavy cables .
  2. Hook Fixing Method Hooks are installed along the inner wall of the tray or shaft, and cables are hung on these hooks. This method accommodates larger or heavier cables but requires additional fabrication and installation of hooks .
  3. Ladder or Trapezoidal Track Method Cables are arranged along a ladder-like or trapezoidal track and then secured with binding tape. This method provides better support for large cables and ensures organized routing, but it requires pre-installed tracks along the shaft .
  4. Spiral Track Method Cables are guided along a spiral track and fixed with binding tape. This method is suitable for large cables and allows controlled routing in confined vertical spaces, though it requires specialized spiral track installation .
Techniques for Heavy or Large Cables

For deep vertical shafts or heavy cables, additional measures are used to prevent twisting, winding, or damage during installation:

  • Steel Wire Rope Assistance: Cables are initially bound to a steel wire rope and lowered together. After positioning, hoisting devices along the shaft lift the cable to balance its weight, allowing the steel wire rope to be detached before final fixing .
  • Hoisting Devices: Chain blocks or slings can be used to lift and stabilize the cable during installation, reducing manual effort and minimizing safety risks in narrow shafts .
  • Sequential Fixing: Cables are fixed from bottom to top, and hoisting devices are removed progressively as sections are secured, ensuring stability and preventing cable sagging or entanglement .
Key Considerations
  • Cable Size and Weight: Choose the binding method based on cable diameter and weight; heavier cables require mechanical support.
  • Safety: Use hoisting devices to reduce manual handling in confined vertical spaces.
  • Organization: Maintain tidy cable routing to prevent tangling and facilitate maintenance.
  • Structural Support: Ensure the tray or shaft wall can support the combined weight of cables and binding hardware. By combining mechanical hoisting, proper binding methods, and sequential fixing, vertical shaft cable installations can be performed efficiently, safely, and with minimal risk of cable damage or entanglement .
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