Quali sono i diversi tipi di gru?

Cranes are the workhorses of modern industry, essential for lifting, commovente, and positioning heavy loads with precision and efficiency. From manufacturing floors to bustling ports and massive construction sites, different types of cranes are designed for specific tasks and environments. Understanding these variations is key to selecting the right equipment for the job. This guide explores the main types of industrial and logistical cranes, their unique features, and their primary applications.

Quali sono i diversi tipi di gru?

Gru a ponte (Gru a ponte)

Overhead cranes are ubiquitous in factories, magazzini, and workshops. They consist of a hoist that moves along a horizontal beam (the bridge), which itself moves on elevated runways along the building’s length.

Gru a ponte monotrave

• Gru a ponte monotrave: Features a single bridge beam. They are cost-effective, lighter, and require less headroom. Ideale per carichi più leggeri (up to ~20 tons) and applications with lower duty cycles.
  • Applicazione: Machine shops, linee di montaggio, aree di stoccaggio.

Gru a ponte a doppia trave

• Gru a ponte a doppia trave: Utilizes two bridge beams for superior strength and stability. They can handle much heavier loads (often over 20 tons and up to several hundred tons), accommodate auxiliary hoists, and provide better hook height.
  • Applicazione: Acciaierie, heavy fabrication facilities, centrali elettriche, paper mills.

Gru a portale

Gantry cranes are similar to overhead cranes but are supported by freestanding legs that move on wheels or rails along the ground, eliminating the need for a building’s roof structure. They are highly versatile for both indoor and outdoor use.

Portale in gomma (RTG) Gru

• Portale in gomma (RTG) Gru: A mobile gantry crane used primarily in container terminals. It runs on rubber tires, making it highly flexible for stacking containers in yard operations.

  • Applicazione: Container yard stacking and handling.

Portale su rotaia (RMG) Gru

• Portale su rotaia (RMG) Gru: Similar to an RTG but runs on fixed rail tracks. This allows for more precise positioning, higher stacking capabilities, and is better suited for automated operations.

  • Applicazione: High-density, organized container storage yards, often in intermodal terminals.

Port Cranes (Marino & Movimentazione dei contenitori)

These are heavy-duty giants designed specifically for the rapid loading and unloading of ships.

Da nave a riva (STS) Gru

• Da nave a riva (STS) Gru / Gru a cavalletto per container: These are the iconic, colossal cranes seen at container terminals. They straddle a ship at berth, moving containers directly between the vessel and the quay. They are essential for modern containerized shipping.

  • Applicazione: Loading and unloading container ships at port terminals.

Gru a cavalletto per container

• Mobile Harbor Crane: A versatile, wheeled or rail-mounted crane that can perform multiple tasks, including handling containers, bulk materials, and general cargo. It offers great flexibility for multi-purpose ports.

  • Applicazione: General cargo ports, bulk terminals, and smaller container facilities.

Portal / Gru a portale (in heavy lifting)

Often referred to as “Goliath” cranes, these are heavy-duty, large-capacity gantry cranes used for massive lifts.

• Descrizione: They feature a fixed or movable structure with one or two beams supported by large, rigid legs on rails. They are engineered for extreme loads.
  • Applicazione: Costruzione navale (lifting ship sections), industria pesante (lifting reactors, turbine), large-scale construction projects (bridge segment installation).

Domande frequenti: Types of Cranes

Q1: What is the most common type of crane inside a factory?

UN: The Overhead Bridge Crane is the most common, with single girder cranes for lighter work and double girder cranes for heavy manufacturing.

Q2: What’s the main difference between an RTG and an RMG?

UN: RTG (Portale in gomma) are mobile and flexible, moving freely in a yard. RMGs (Portale su rotaia) run on fixed tracks, offering greater precision, stability for higher stacking, and are easier to automate.

Q3: Which crane is specifically designed for unloading container ships?

UN: The Ship-to-Shore (STS) Container Gantry Crane is specifically engineered for this high-speed, high-capacity task.

Q4: What type of crane would be used to build a large ship?

UN: Massive Portal/Gantry Cranes (often called Goliath or shipbuilding gantries) are used to lift and position large prefabricated sections of a ship’s hull and superstructure.

Q5: How do I choose the right type of crane?

UN: I fattori chiave includono: Weight and size of loads, required span and lifting height, ciclo di lavoro (frequency of use), available space (interno/esterno), esigenze di mobilità, e bilancio. Consulting with a crane specialist is always recommended.

Conclusione

From the precision of a workshop’s overhead crane to the raw power of a port’s STS crane, each type of crane plays a vital role in global industry and infrastructure. Selecting the correct crane—whether it’s a versatile gantry, a specialized container handler, or a heavy-lift portal crane—is fundamental to achieving safety, efficienza, and productivity in any material handling operation.