4.2. Types of Tower Cranes

There are also some guidelines given for the safe crane operations because you know that there are so many accidents related to cranes reported very commonly. So, that is why we should follow some safe guidelines when you operate the crane. So, carefully set the outriggers on firm supports because statistics shows that at least 50% of crane incidents occur because outriggers are not extended properly that is why we have to carefully set the outriggers and also check for the soil condition.

Safety guidelines are critical in crane operation to minimize accidents. A significant number of crane incidents happen due to improper setup of outriggers, which are the extendable supports that stabilize the crane. To ensure safety, we must carefully position these outriggers on stable ground, ensuring they are fully extended and even check soil conditions to prevent the crane from tipping over.

Imagine a person trying to lift a heavy box while standing on a sandy beach. If they don't have their feet firmly planted, they might lose balance and fall. Similarly, outriggers must be set on stable ground to keep the crane upright while handling heavy loads.

If the soil is going to be weak, provide some timber mats or steel mats and on that, you can place the outriggers. Check the safe lifting capacity charts for the entire range of planned swing that is very important. You know that lifting capacity will vary with the operating radius and the lifting capacity varies depending upon the position of the boom with respect to the carrier.

Weak soil can jeopardize crane stability. To address this, timber or steel mats should be used under outriggers to distribute weight and enhance support. Additionally, understanding lifting capacity is crucial. This capacity changes based on how far the crane's boom extends (operating radius) and its orientation (position of the boom), which directly affects how much load the crane can safely lift.

Think of a trampoline – if numerous people jump on it from the center, it can handle their weight. However, if someone jumps from the edge, the trampoline might collapse. Similarly, cranes have a maximum capacity that varies based on how far the boom reaches from its base.

In modern cranes, you have this load moment indicators also. So, if the load is getting exceeded at a particular operating radius, it gives you a warning or some alarm or indication is given. So, that we can check for the safety.

Modern cranes are equipped with load moment indicators that are critical for safety. These indicators monitor the load being lifted and the crane's position. If a load approaches or exceeds the crane's lifting capacity at a certain operating radius, the system provides an alarm, allowing operators to take appropriate action before a potential overload occurs.

It’s like a car with a warning light for when the fuel is low. Just as that light alerts you to refill the tank before running out of fuel, the load moment indicators alert crane operators to avoid exceeding safe lifting limits.

Some of the accidents are reported due to electrocution when the crane booms are in contact with high voltage power lines. So, that is why according to OSHA, some specific guidelines are given that we should prohibit the crane or the load from the approaching closer than 3 meters to high voltage carrying 50 kilowatts.

Electrocution is a serious risk when crane booms come too close to high voltage power lines. OSHA has established guidelines that require cranes and loads to maintain a distance of at least 3 meters from these lines to prevent accidental contact, which could lead to severe injuries or fatalities.

Consider how you wouldn’t stand too close to a beehive out of fear of getting stung. Similarly, maintaining a safe distance from power lines is essential for protecting everyone’s safety on the work site.

Wind load should also be considered. If the wind speed is very high say, as I told you as per the highest score, if it is greater than 72 kilometers per hour, you should stop the crane operation and according to the wind speed prevailing that particular area, the lifting capacity should be reduced.

Wind can significantly impact the stability of cranes during operation. When wind speeds exceed 72 kilometers per hour, operations should be halted to prevent accidents. Furthermore, lifting capacities must be adjusted based on the actual wind conditions to ensure safety.

Think about flying a kite. On calm days, you can let the kite soar, but if a strong gust of wind comes, you must steady it or bring it down to avoid losing control. Similarly, cranes need to be 'grounded' during high winds to prevent unsafe conditions.

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