Parts of a Tower Crane

Base Support
The base support is the foundation of a tower crane and is located at the base of the structure. It is usually attached to a concrete pad on the ground, providing a strong, stable foundation. In some cases, the base support may be attached to a steel grating or a ballasted chassis, which can be placed on top of an existing structure or directly on the ground. This foundation element ensures that the crane remains stable during operation.
Tower (Mast)
The tower, commonly known as the mast, is the vertical structure that gives the crane its impressive height. Extending upward from the base, the tower supports key components such as the cab, hook and counterweight. It is constructed using steel lattice sections to provide additional strength and rigidity, allowing the crane to reach great heights without compromising stability.
Turntable
The turntable is a key component of a tower crane and is located at the top of the mast. It enables the arm (crane jib) to rotate, giving the crane a wide range of motion. The mechanism uses similar technology to a windmill to allow for smooth, precise rotation. The turntable is essential for accurately positioning loads on a construction site.
Cabin
The cab is the control center of the crane. This enclosed space houses the operator as well as the necessary control systems, including joysticks and computers to operate the crane. From this vantage point, the operator can perform complex lifting and positioning tasks with precision.
Boom (Working Boom)
The boom, known as the working boom, is a horizontal member extending from the top of the tower. Its primary function is to support and position the load being lifted. The boom can extend outward and move the load horizontally, allowing for the flexibility to place materials exactly where they are needed on the construction site.
Trolley and Hook Block
The trolley is the moving member that moves back and forth along the boom. The hook block is attached to the trolley, which acts as a pulley system. This arrangement allows the hook to move vertically up and down the tower, facilitating the lifting and lowering of loads. The combination of the trolley and hook block is essential for the precise movement of materials.
Counter-jib
The jib is a horizontal arm that extends in the opposite direction of the jib. Its role is to help balance the crane by counteracting the weight of the load being lifted. The counter-jib also serves as a mounting point for counterweights, which are essential to maintaining the stability of the crane during operation.
Counterweights
Counterweights are a critical component in balancing the crane during lifting tasks. These weights are located at the rear of the jib and counteract the load being lifted on the arm. Without counterweight, the load capacity of a crane would be significantly reduced to ensure stability. Common materials used for counterweight include reinforced concrete and steel, providing the necessary weight to keep the crane balanced.
Each of these components works in harmony to make tower cranes an indispensable tool for construction projects, capable of lifting and precisely placing materials at considerable heights.