How long is the longest boom of a tower crane?

The longest boom of a tower crane is 65 meters.

Tower crane is the most commonly used lifting equipment on construction sites. It is also called "tower crane". It is extended (height) section by section (referred to as "standard section") to lift the raw materials for construction such as steel bars, wooden slats, concrete, steel pipes, etc. Tower crane is an indispensable equipment on construction sites.

The function of the tower crane tip is to bear the upper load transmitted by the arm rope and the balance arm rope, and directly transmit it to the tower structure through the turntable through the structural components such as the rotating tower, turntable, and bearing. The top of the self-elevating tower has truncated cone column type, forward or backward truncated cone column type, herringbone type and diagonal support frame type.

All upper rotating tower cranes need to be equipped with a counterweight, whose function is to support the counterweight to form the counterweight required in the design and the opposite direction of the lifting torque. In addition to the counterweight, a lifting mechanism is often installed at its tail. The reason why the hoisting mechanism is placed at the tail end of the balance arm together with the counterweight is that it can play a partial counterweight role and increase the distance between the rope drum and the tower top guide wheel to facilitate the winding of the wire rope and avoid the occurrence of rope disorder.

The amount of counterweight used is inversely proportional to the length of the balance arm, and there is a certain proportional relationship between the length of the balance arm and the length of the crane arm. The counterweight is quite considerable. Generally, a light tower crane needs at least 3 to 4 tons, and a heavy tower crane needs nearly 30 tons.