Cables in vertical shafts can be securely fixed using specialized hangers, cleats, or spring-loaded clamps without the need for a bridge tray, ensuring mechanical stability and safety.

Methods for Fixing Cables

1. Sequential Hoisting and Wall Fixing A method involves initially lowering the cable with a steel wire rope and then using multiple hoisting devices along the shaft to balance the cable's weight. Once the cable is stabilized, the steel wire rope is removed, and the cable is fixed directly to the shaft wall using cleats or clamps from bottom to top. This approach reduces manual handling risks and prevents cable winding or tangling during installation (CN117673967A) . 2. Cable Hangers and Cleats Specialized vertical cable hangers, such as wedge-style gripping mechanisms or spring-loaded cleats, can secure heavy power feeders or armored cables. These devices distribute the cable weight over a larger surface area, preventing slippage, insulation creep, or mechanical deformation due to thermal expansion and contraction. For lighter data cables, wide-flared bases or J-hooks maintain bend radius and prevent crushing of the cable core (Ecoroof Systems) . 3. Flexible or Snaked Installation For high-voltage or large conductor cables, a flexible or snaked vertical installation can be used. This method allows the cable to accommodate thermal expansion and reduces stress on cleats. Experimental studies show that spring-loaded cleats or properly spaced clamps prevent downward movement of the cable relative to the shaft wall, maintaining long-term stability (Jicable) . 4. Material and Hardware Considerations

• Use high-tensile steel or stainless steel for cleats and hangers to withstand mechanical loads and environmental conditions.
• Avoid closed loops of ferromagnetic steel to prevent magnetic interference.
• Ensure clamps or cleats provide constant lateral clamping force to prevent slippage over time (Cableizer) . 5. Planning and Safety
• Plan the cable route and fixation points carefully before installation.
• Use synchronized cable pushers or hoisting devices to control cable movement.
• Ensure personnel are trained and equipped for vertical shaft work, as installation can be hazardous (Cableizer) .

Summary

By combining hoisting techniques, spring-loaded cleats, wedge-style hangers, and careful planning, cables can be safely and efficiently fixed in vertical shafts without bridge trays. Proper hardware selection and spacing are critical to prevent slippage, mechanical stress, and insulation damage, ensuring long-term reliability and safety.