• Jun 06, 2025
• Case Studies

10-ton LH Bridge Crane and Steel Structures for US

Discover our 10-ton LH bridge crane and durable steel structures, perfect for equipment production in the US. Boost your efficiency and safety today!

The customer operates within the heavy equipment production segment, manufacturing hydraulic pumps, industrial compressors, and custom high-capacity drive systems. Their primary clients include construction contractors, oil and gas firms, and power generation companies. Given the weight of base frames and machined assemblies—often exceeding 8 tons—manual handling is impractical. As a result, the customer needed a bridge crane system to help them with their production.

Operational Requirements

Key customer needs included:

• High duty cycle: According to the customer, the new crane is used frequently, with several hours of work per day. Several lifts are required every hour.
• Low clear height: The facility's roof truss limited headroom to 7 meters, necessitating an LH bridge crane capable of maximizing hook travel without infringing on overhead piping and HVAC ducts.
• Precision positioning: Alignment tolerance within ±5 millimeters when placing components onto machining fixtures. This is essential to maintain machining accuracy and avoid rework.
• Load monitoring: Integration of load sensors and a digital load display. For heavy-duty applications, they were concerned that overloading was causing problems for the crane and their production.
• Scalability: The ability to expand the crane's coverage area to future assembly cells when the plant undergoes expansion in the next 24 months.

Challenges Before Implementation

Before following the new cranes, the plant faced many challenges that created problems for the actual operation of the plant. This affects the factory's production environment, costs and production processes.

1. Lack of Adequate Lifting Capacity

The shop relied on two 5-ton jib cranes with a 4-meter reach. They could not lift a single 7.5-ton gearbox housing. Operators had to break that part into smaller subassemblies. That added handling steps and assembly time. It also raised the risk of alignment errors and damage to parts. The extra work increased labor hours and slowed cycle time. Where heavy work could be done was also restricted by the existing jibs.

2. Lack of Support Rails for Bridge Cranes

Since their factory had been using jib cranes for production in the past, their factory did not have enough support beams to support the operation of the overhead cranes. The cost of installing steelwork and rail would be far more than that of the crane itself. Additionally, the conversion would necessitate reinforcing columns and cutting into the building. Long plant shutdowns or phased work with temporary production loss would be required for these civil activities. Management postponed the investment due to strict manufacturing schedules.

3. Inefficient Material Flow

The machining bay split into three isolated zones. No overhead transfer connected them. Workers moved finished parts by forklift across aisles. That practice increased handling time and congestion. It also raised the chance of forklift collisions and dropped loads. Parts waited in buffer zones. Inventory piled up between cells. Buffer zones were where parts waited. Between the cells was a pile of inventory. Throughput was decreased and takt time targets were more difficult to satisfy due to the fragmented flow.

4. Maintenance and Downtime

The old jib cranes had years of service. They demanded monthly lubrication and inspections. Technicians spent many hours on routine upkeep. The cranes also needed more frequent part changes, such as bearings, rope, and brake components. The total effectiveness of the equipment was reduced by the cumulative downtime from maintenance and malfunctions.

Product Design and Specifications

10-ton Low Headroom Bridge Crane Overview

In confined vertical spaces, this 10-ton double-girder bridge crane can lift anything. To increase hook travel, our designers lowered the footprint of the trolley and hoist. In buildings with little above clearance, the outcome provides dependable performance, accurate control, and simpler maintenance.

1. Girder Profile

High-strength rolled I-beams composed of A572 Grade 50 steel are used in the crane. The strength-to-weight ratio of this material is good. To manage bending and shear under dynamic stresses, engineers size the flange and web. Where necessary, they install welded splice plates and stiffeners. To keep the bridge level under stress, the girder has a tiny camber built into it. In order to maintain runway alignment, fabrication comes after shop welding and dimensional control.

2. End Trucks

End trucks minimize flex at maximum load by using a welded box-section construction. For a long service life, we heat-treat and mill wheels made of forged alloy steel. The trucks include sealed lubrication locations and precise bearings. Correct wheel-to-rail contact is maintained via flange wear pads and adjustable end-play. Buffers and limit switches can be mounted on the truck frame.

3. Hoist Mechanism

The system uses a dual-speed wire-rope hoist with two falls (two-part reeving). Two falls cut rope pull and spread load across the drum. The hoist pairs with a VFD to give smooth starts and stops. The VFD reduces load sway and extends rope life. The hoist includes a mechanical holding brake, drum guard, rope guide, and rope lubrication plan. Inspect rope lay, end fittings, and drum grooves often.

4. Low Headroom Trolley

The trolley's structure is small, saving 300 mm of headroom. A small reduction gearset with a low-profile motor are used by designers. Easy access panels are created by technicians for engine maintenance and gearbox oil inspections. The hook is kept as close to the girder as feasible by the trolley. Despite having little overhead room, this arrangement maintains good performance.

5. Load Monitoring

An integrated multifunction load display with an accuracy of ±1% is used by the crane. The actual hook load is read by a calibrated transducer or load cell. When lifting exceeds 110% of rated capacity, the system locks out and sounds an overload alarm. For checks, we provide calibration data and a straightforward user interface. The indicator should be tested by operators before to shifts.

6. Safety Features

The crane has well-marked travel limits and end stops with shock-absorbing buffers. The emergency stop on the pendant is easily accessible. The device features visual warning lights for movement and audio horns. ANSI/ASME B30.2 requirements for multi-crane configurations are met by anti-collision switches. Phase-failure detection, upper/lower limit switches, overload protection, and an emergency lowering process are also covered in the design. Demand operator training and pre-shift checks. Test safety devices frequently and maintain a maintenance diary.

Steel Structures for Crane Support

The customer's facility required reinforced steel runway structures to support the crane and distribute loads to the existing columns. Design specifications included:

• Runway Beams: A36 steel beams sized W12×120 installed on 3 meter centers. Beams were checked for camber within ±5 millimeters to ensure level travel.
• Purlin Reinforcements: Steel purlins and cross-bracing installed between runway beams to prevent lateral displacement under dynamic loads. According to AISC guidelines, cross-bracing improves structural stability by 15%.
• Column Reinforcement: Concrete encapsulation around column bases to increase bearing capacity. Geotechnical analysis confirmed an allowable soil pressure of 150 kPa.
• Anchorage and Fasteners: High-tensile anchor bolts (Grade 8.8) embedded in epoxy grout ensured secure connections between base plates and the concrete foundation.
• Safety Access Platforms: Walkways with handrails installed along the crane runway for overhead inspection and maintenance. OSHA recommends 0.9 meter minimum walkway width for fall protection compliance (OSHA, 2023).

Integration with Facility Layout

To maximize workspace efficiency, the crane runway spanned 24 meters, covering all three machining zones. The crane runway girders were mounted 6 meters above the shop floor, providing 6.5 meters of hook lift to accommodate tall assemblies.

Yuantai LH Double Girder Gantry Crane

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The Double Girder Overhead Crane consists of two main girders that support the crane's trolley and hoist, giving stronger structure and higher lifting capacity than single-girder models. That dual-girder layout allows the hoist to ride between the girders, maximizing hook height. It handles heavy loads with better stability and endurance. The crane often features advanced safety devices like overload limiters, travel limits, and anti-collision systems. Control options include pendant, remote, or operator cab.

Crane tasks

1. Heavy Base Frame Transfer

One of the primary tasks was lifting an 8.5 ton enclosure base frame from the unloading dock to the machining center. Before installation, employees divided this weight using two 5-ton electric chain hoists and manual labor, consuming 45 minutes per transfer. The LH bridge crane handled the full base frame in a single lift.

2. Precise Component Placement in Assembly Cells

During assembly, precision was essential. Certain hydraulic pump components—such as housings and rotors—required placement onto fixtures with a tolerance of ±3 millimeters. The dual-speed hoist allowed operators to slow the lift to 0.5 m/min during final approach.

3. Handling Irregular Loads and Long Objects

The client also produced custom drive shafts up to 5 meters in length and weighing 3 tons. The LH crane's trolley could traverse at full speed with these long loads without inducing excessive sway, thanks to the low headroom design that maintained load center close to the runway beam.

Advantages and Benefits of the 10-ton LH Bridge Crane

The runway is fitted closer to the roof by the LH (low-headroom) design. This increases the height of the available hook. You can stack items taller with a higher hook height. Compared to tiny jib cranes, the crane can manage bulkier and heavier loads. Additionally, it centralizes lifting tasks throughout the shop. When combined, these features save handling steps, save energy, boost storage density, and reduce downtime.

1. Optimized Floor Space Utilization

The LH design allowed the runway to be mounted closer to the roof structure. As a result, the crane hook could access higher stacking of raw material racks. The facility reorganized floor layouts, increasing storage density by 12%.

2. Improved Energy Efficiency

The VFD-driven hoist and travel motors reduced peak current draw by 20% compared to a direct-on-line (DOL) system. This will save kilowatts of electricity over the course of a year, reducing crane operating costs.

3. Enhanced Safety Compliance

The integrated load monitoring system ensured that lifts never exceeded 10 tons. Audible and visual alarms alerted operators in real-time of approaching overload conditions. Weekly safety audits documented 100% compliance with OSHA lifting standards for overhead cranes.

4. Reduced Maintenance Costs

Compared to the previous jib cranes, the bridge crane's enclosed gear train and heavy-duty sealed bearings reduced frequency of lubrication from monthly to quarterly intervals. This design greatly reduces the maintenance requirements of the overhead cranes.

Other Applications and Use Cases

1. Aerospace Component Assembly

Bridge cranes with 10-ton capacity and LH design are well-suited for aerospace paint hangars and composite layup areas. In these environments, vertical clearance is constrained by filtration and ventilation ducts. Precise placement of fuselage sections or wing panels—each weighing up to 8 tons—requires similar accuracy and control.

2. Automotive Die Handling

Automotive stamping plants often utilize bridge cranes to handle heavy dies that exceed 12 tons. Although the case study focuses on 10-ton cranes, similar LH designs can be scaled to 15 tons. However, for smaller tool rooms or die maintenance areas, a 10-ton LH crane is ideal. It allows technicians to change dies on stamping presses within 30 minutes, compared to more minutes using mobile gantry systems.

3. Steel Fabrication Shops

In steel fabrication facilities, moving large plates and fabricated subassemblies is common. A 10-ton LH crane assists with flipping, rotating, and loading heavy plates onto CNC plasma cutters. For shops with limited ceiling height, the LH configuration optimizes headroom for sheet stacking up to 2.5 meters high.

4. Warehouse and Distribution Centers

In high-throughput distribution centers handling heavy pallets and bulk materials, 10-ton overhead cranes can complement automated storage and retrieval systems (AS/RS). For example, moving steel coils or machines within confined racking aisles benefits from the compact trolley design of an LH crane.

Case Study Summary and Final Thoughts

The adoption of a 10-ton LH bridge crane, complemented by robust steel runway structures, addressed the customer's primary challenges in heavy equipment production. The crane's design met low headroom constraints while providing precise, safe, and efficient material handling. As a result, the facility saw marked improvements in cycle times, operational safety, energy consumption, and maintenance costs.