Learn essential tower rescue operations, including ladder truck use, rope rescue techniques, and hybrid skating block systems. Prioritize safety and coordination with power companies.
There are situations where electrical workers become stranded on transmission towers, or paragliders get entangled and can’t move. The condition of the person in need of rescue varies, but here is a simple and quick summary of the activities involved in such rescues.
About Transmission Towers
Transmission towers are structures that support power lines. They come in various shapes and sizes depending on their location and the voltage they carry. They are primarily used for their strength and reliability.
Power Lines
Power lines are often insulated with polyethylene or rubber, but many are not, especially high-voltage lines on transmission towers, which lack insulation.
High-voltage power lines carry electricity from power plants at over 500,000 volts.
Voltage and Electric Shock
Humans can die from electric shock, not directly from voltage but from the current (amperes) that flows through the body. Here are some effects of electric current:
Current (A) | Effect |
---|---|
0.001 | Feel a shock, might cause a tingle. |
0.005 | Feel pain and lingering discomfort. |
0.01 | Causes skin burns. |
0.02 | Causes muscle spasms and loss of control. |
0.05 | Can stop breathing or the heart. |
0.1 | Fatal. |
Rescue Operations
Rescue operations on transmission towers should be coordinated with the power company due to the risk of electric shock and the difficulty of working on towers.
Initial Actions
- Report the situation to the power company and other relevant parties.
- Assess the situation and determine the rescue method.
- Communicate with the person needing rescue to check their consciousness.
Consider using an air rescue mat (super soft landing) depending on the situation.
Using a Ladder Truck
If a ladder truck can be used, ensure no live power lines are in the way, extend the ladder, and rescue the person into the basket.
Without a Ladder Truck
If a ladder truck cannot be used, use rope rescue techniques.
- A rescuer climbs the tower using an absorber.
- Prepare equipment:
- Two ropes (with terminals)
- One carabiner
- One sling
- Pitagor harness (if the person is not already harnessed)
- Create an anchor at the tower base (using a vehicle if necessary).
- Set up a support point about 1 meter above the person using a carabiner and sling.
- Attach a rope from the support point to the person’s harness.
- Pull the rope to transfer the load onto the rescue rope.
- Detach the original rope from the person. If they are not harnessed, secure them with a rescue harness (e.g., Pitagor).
- Attach a guiding rope to the person.
- Gradually lower the person using the guiding rope while controlling the descent.
Skating Block System
Use skating block technology to minimize high-altitude work steps and increase efficiency.
- Access the person needing rescue with a rescue kit.
- Set up the system high above the person to ensure efficient rope tension.
- Ground crew tensions the rope to reduce slack.
- Use the “Jug System” to release the person’s harness.
- Ground crew controls the descent to avoid contact with obstacles near the tower base.
If ground rescue is difficult, request a fire department helicopter for an aerial rescue.
This guide provides a streamlined approach to tower rescue operations, emphasizing safety and coordination with power companies.