China has achieved a significant construction milestone in Fujian Province after engineers successfully shifted a massive steel bridge deck weighing approximately 15,000 tonnes across a distance of 135 metres. The operation took place at the Guanyinshan Beach Bridge, part of the Xiamen section of the Xiamen–Kinmen Bridge project.

Completed on October 9, 2026, the carefully coordinated movement positioned the enormous steel structure at its intended location, clearing the way for subsequent construction work. The achievement highlights the growing role of advanced engineering methods in China’s major transport infrastructure projects.

A Giant Steel Structure Moved as a Single Unit

The operation involved moving a complex steel box-girder assembly rather than transporting individual sections into place one by one. The structure consists of 161 welded steel box-girder sections and forms a crucial part of the bridge deck.

Instead of assembling the entire deck directly at its final position, construction teams built it on a separate platform before shifting it horizontally into place. This approach allowed different construction activities to proceed simultaneously, helping reduce delays caused by the project’s limited working space.

The movement covered 135 metres, with engineers coordinating numerous heavy-duty hydraulic jacks and sliding systems to control the structure’s position throughout the operation.

According to project information, 56 three-directional hydraulic jacks, each with a rated capacity of 600 tonnes, supported the massive structure. Another 44 jacks, each rated at 100 tonnes, supplied the horizontal force required to move it along five designated sliding paths.

The coordinated system maintained the movement of the interconnected steel assembly while helping prevent uneven loading, excessive deformation and interruptions during the operation.

Precision Engineering Over a Challenging Coastal Site

The Guanyinshan Beach Bridge presents several engineering challenges because it is being constructed in a coastal environment where available working space is limited. Tidal conditions, maritime winds and the need to protect the surrounding beachfront add complexity to the construction process.

The bridge’s unusual configuration also requires careful control of its geometry. The structure features a twin-ribbed steel arch design, with the main roadway and adjoining ramps arranged at different elevations.

The bridge is approximately 525 metres long, with a main span of 385 metres and an arch rise of about 93 metres. Its widest section approaches 90 metres, while the maximum elevation difference across the roadway arrangement reaches approximately 8.3 metres.

These characteristics make the positioning of the steel deck especially demanding. Even small differences in the movement of individual support points could affect how loads are distributed across the structure.

To manage these risks, engineers used a multi-track support arrangement and synchronised equipment controls. The system was designed to keep the steel assembly moving evenly while monitoring its alignment throughout the transfer.

Project information indicates that the final positioning accuracy was maintained within millimetre-level tolerances, demonstrating the importance of coordinated equipment operation and detailed construction planning.

Why Engineers Chose Horizontal Shifting

Moving a completed bridge deck horizontally may appear more complicated than building it directly at its final location. However, the method offers important advantages when construction space is restricted or several major operations must take place at the same time.

At Guanyinshan, assembling the deck separately allowed work on the steel roadway and the bridge’s arch structure to progress in parallel. This reduced the need for one construction activity to wait for another to finish.

The strategy also helped make more efficient use of the limited construction platform, where equipment, materials and assembly areas had to be carefully organised.

Such techniques require extensive preparation. Engineers must calculate the loads acting on the structure, determine how the weight will be transferred between support points and ensure that the pushing equipment operates in a coordinated manner.

The successful relocation demonstrates how specialised construction methods can help address difficult site conditions without relying entirely on conventional, sequential assembly.

An Important Step for the Xiamen–Kinmen Bridge Project

The Guanyinshan Beach Bridge forms part of the Xiamen section of the wider Xiamen–Kinmen Bridge project. The Xiamen section is planned to connect the road network on Xiamen Island with Xiamen Xiang’an International Airport, providing an important link within the city’s transport infrastructure.

The main route is approximately 17.34 kilometres long, beginning near the junction of Huandao East Road and Huizhan North Road and extending towards the airport.

The newly positioned steel deck represents an important step towards completing the bridge’s upper structure. Subsequent work includes operations associated with the suspension system, the permanent structural load-bearing arrangement, the road surface, mechanical and electrical installations, and traffic safety facilities.

The successful movement does not mean the entire bridge is ready for use. Further construction, inspections and completion work remain necessary before the relevant sections can enter service.

Project updates have indicated a target of completing the offshore mainline in Xiamen by the end of 2026. The timing of opening the entire Xiamen section to traffic should be distinguished from that milestone, as the two do not necessarily represent the same stage of completion.

What the Project Means for Infrastructure Development

Large infrastructure projects increasingly depend on a combination of conventional civil engineering, specialised machinery and digital coordination systems. Moving an assembled structure weighing thousands of tonnes requires more than raw lifting capacity; it also depends on accurate load distribution, reliable monitoring and the ability to keep numerous machines operating in unison.

The Guanyinshan operation illustrates how these methods can be applied to complex bridge construction in constrained environments.

The project also highlights the importance of planning construction around environmental conditions and limited space. In coastal areas, engineers must account for weather, wind exposure and changing site conditions while ensuring that large structural components remain stable during installation.

As infrastructure networks expand, techniques such as prefabrication, parallel construction and synchronised hydraulic movement may offer useful options for projects where traditional installation methods would require more time or create additional logistical difficulties.

The successful 135-metre relocation of the 15,000-tonne steel deck is therefore more than a striking construction achievement. It marks a key stage in the development of the Guanyinshan Beach Bridge and moves the Xiamen section of the Xiamen–Kinmen Bridge closer to its next phase of construction.