300 Grue à portique à double poutre de tonne

When your operation needs to move loads of 300 tonnes ou plus, day after day, a standard overhead crane is no longer enough. Le 300 ton double girder gantry crane is a heavy-duty lifting system engineered for exactly this job: two parallel box girders supported by floor-mounted legs, with a trolley that travels along the girders and hoists loads rated up to 300 tonnes métriques.

300 ton double girder gantry crane

Its double-girder structure delivers the rigidity, stability and headroom that single-girder designs cannot offer at this capacity. That is why it is the industry-standard solution in shipbuilding, steel processing, precast concrete production, bridge construction and heavy machinery assembly — anywhere that large, expensive loads must be handled with precision and safety.

Qu'est-ce qu'un 300 Grue à portique à double poutre de tonne?

Un portique (également appelé grue à portique) is a bridge crane whose main girders are carried by legs that run on ground-level rails, instead of being mounted on building walls or columns. The “double girder” configuration uses two parallel main girders, which allows a heavier rated capacity, greater hook travel height, and better stability than a single-girder design.

300+300 ton double girder gantry crane

A typical 300 t gantry crane consists of:

• ◆ Two box-type main girders — the primary load-bearing structure
• ◆ A trolley fitted with a 300 t main hoist and, généralement, an auxiliary hoist (typically 50–80 t) for lighter and faster handling
• ◆ Two legs (A-frame or U-frame) that connect the girders to the ground
• ◆ End carriages with travel drive units that move the whole crane along the rails
• ◆ An electrical control system — operated from a cabin, a pendant station, ou une télécommande sans fil

The crane handles loads through the main hook, while the auxiliary hook lifts smaller loads or flips and positions workpieces — so a single machine covers a full range of lifting tasks.

Spécifications clés

The table below shows typical configurations. Every parameter — span, hauteur de levage, speeds, duty class and control mode — is fully customizable to your site and application.

Main Components and Construction Quality

1. Box-Type Main Girders

The two main girders are the heart of the crane. They are fabricated from Q355B low-alloy structural steel, welded with automatic submerged arc welding, and then stress-relief annealed to remove internal welding stress. This prevents deformation during long-term heavy-load operation. The girder cross-section is optimized with finite element analysis (FEA) to balance dead weight and load capacity, which means high rigidity and low deflection — critical for accurate positioning of 300-ton loads.

2. Trolley with Main and Auxiliary Hoists

The trolley carries the main hoist (300 t) and an auxiliary hoist. Heavy-duty hoisting mechanisms are designed for smooth, controlled lifting with reliable braking. Variable-frequency drive (VFD) is available for stepless, jerk-free speed control on hoisting, trolley travel and crane travel.

300 ton double girder gantry crane

3. Legs and End Carriages

The girders are supported by A-frame or U-frame box legs that give the crane a wide, stable base — essential for outdoor operation in wind. The end carriages use an integrated box structure with a three-in-one motor-reducer-brake drive unit, ensuring smooth and reliable travel along the rail.

4. Electrical and Safety Systems

Chaque 300 t gantry crane is fitted with comprehensive protection, y compris:

• ◆ Overload limiter
• ◆ Hoisting and travel limit switches
• ◆ Anti-collision devices
• ◆ Wind speed alarm (for outdoor installations)
• ◆ Emergency stop and audible/visual alarms
• ◆ Dual braking on the hoisting mechanism
• ◆ Lightning protection and rain-proof enclosures for outdoor use

Design Standards and Safety

The crane is designed in compliance with international crane standards, y compris FEM, ISO, DIN and GB, and can be supplied with CE documentation for European projects. The duty class (A3-A5 / M3 à M5) is selected according to your actual workload — the number of operating hours per day and the frequency of full-load lifts — so you never pay for unnecessary capacity, and you never undersize the structure.

300 ton double girder gantry crane

Double Girder vs. Grue à portique monopoutre

For 300-ton applications, a double girder design is the only practical choice.

300 Ton Double Girder Gantry Crane Applications

Le 300 ton double girder gantry crane is widely used in:

• ◆ Construction navale — hull block assembly, section turnover and dry-dock / slipway handling (shipyard models with spans of 50 m and above, and lifting heights over 50 m)
• ◆ Aciéries — lifting steel coils, slabs and bundles, often with C-hooks, lifting magnets or grabs
• ◆ Precast concrete yards — mold handling and product stacking
• ◆ Bridge and infrastructure construction — erection of heavy precast beams and segments
• ◆ Heavy machinery manufacturing — assembly and turnover of large components such as turbines, transformers and pressure vessels
• ◆ Ports and storage yards — container and bulk cargo handling with appropriate attachments

Options de personnalisation

Chaque 300 t gantry crane is engineered for its site. Common customization includes:

• ◆ Portée, lifting height and rail gauge
• ◆ Auxiliary hook capacity and lifting speeds
• ◆ Cabin, pendant or wireless remote control
• ◆ Rail-mounted or rubber-tyred travel
• ◆ Special attachments: Crochet en C, spreader beam, lifting magnet, grab or rotating hook
• ◆ Adaptations for extreme environments: high wind zones, coastal salt corrosion, low temperatures or high dust
• ◆ Hot-dip galvanized or heavy-duty paint systems for outdoor service

How to Choose the Right 300 Grue à portique de tonnes

Before requesting a quote, prepare the following information:

• 1. Maximum load weight and dimensions — including any future load growth
• 2. Span and required lifting height — measure the distance between rails and the highest point you need to reach
• 3. Duty cycle — how many hours per day and how many lifts per hour
• 4. Working environment — indoor or outdoor, wind conditions, température, humidité et poussière
• 5. Power supply and control preference
• 6. Required standards and certifications — FEM, ISO, GB, CE, etc..

A reputable manufacturer will provide a design drawing, load chart and FEM/ISO calculation report before production, and full after-sales support with spare parts and installation guidance.

Usine Weihua

FAQ À propos 300 Grue à portique à double poutre de tonne

Q1: How much does a 300 ton double girder gantry crane cost?

UN: The price depends mainly on span, hauteur de levage, classe de service, control mode and optional equipment. Because every heavy gantry crane is engineered to order, suppliers quote per project — contact us with your requirements for a detailed quotation.

Q2: What is the difference between a gantry crane and an overhead crane?

UN: An overhead crane runs on rails mounted on building walls or columns, while a gantry crane stands on its own legs and runs on ground-level rails. Gantry cranes are ideal for outdoor yards and sites without runway support structures.

Q3: La portée et la hauteur de levage peuvent-elles être personnalisées?

UN: Oui. Standard spans are typically 18–40 m, and shipyard models can reach 89 m or more. Lifting height is customized according to your site, jusqu'à 76 m in shipbuilding applications.

T4: What standards does the crane comply with?

UN: The crane is designed to FEM, ISO, DIN and GB standards, with CE documentation available for European projects. Duty class is selected based on your actual workload.

Q5: How long is the delivery time?

UN: Delivery depends on configuration and production schedule. Heavy-duty cranes are typically manufactured to order — confirm the lead time with your supplier when you place the order.

Get a Tailored Quote

UN 300 ton double girder gantry crane is a long-term investment in your production capacity. Choose a manufacturer that provides custom engineering, FEM-verified design, quality manufacturing and reliable after-sales service. Send us your load, span and lifting-height requirements — our engineers will reply within 24 hours with a design proposal and quotation.