Hangzhou Bay Bridge
Where our solutions on expansion joint have delivered over a decade of service with zero major component replacement. For the same demanding crossing, we engineered ECO polyurethane pavement to meet the extreme conditions that define this environment.
Record‑Breaking Bridge, Proven Performance
Spanning 36 kilometers, the Hangzhou Bay Bridge connects Jiaxing and Ningbo, shortening the distance between Ningbo and Shanghai by 120 kilometers. The bridge features two navigation channels: the north channel is a diamond-shaped twin-pylon cable-stayed bridge with a 448-meter main span for vessels up to 35,000 tons; the south, an A-shaped single-pylon one with a 318-meter main span for vessels up to 3,000 tons. The approach spans, meanwhile, use prestressed concrete continuous box girders ranging from 30 to 80 meters.
A Bridge Built for Extreme Conditions
Hangzhou Bay is defined by extreme tidal conditions and frequent typhoons. These challenges made this crossing the ultimate proving ground for our products, where the solutions we delivered set new benchmarks for cross-sea bridge infrastructure.
On May 1, 2008, the Hangzhou Bay Bridge opened to traffic. At the time, it was the longest cross‑sea bridge in the world and among the most demanding engineering projects ever built. By improving connectivity, the project helped accelerate the flow of goods, capital, and information across the Yangtze River Delta.
Upon completion, the Hangzhou Bay Bridge was the world’s longest cross-sea bridge, with a total length of 36 kilometers.
It also featured the highest number of piers among domestic bridges at the time, with 628 piers in total.
Among these, the longest box girder reached 70 meters and weighed 2,200 tons, equivalent to a fully loaded freight train, earning it the title "Asia's Beam King."
Our Commitment to Innovation
All the expansion joints on the Hangzhou Bay Bridge are ROABY products. While foreign companies had quoted RMB 150 million for the full set, ROABY won the contract for all 235 units with its expansion joint system—delivered at an actual cost of around RMB 70 million, a saving of over 50 percent. More than a decade after the bridge opened to traffic, the main components have zero replacements.
ROABY Multidirectional Expansion Joint was recognized as a national champion in its category, brought Ningbo its first National Invention Award and a China Patent Gold Award, and became the preferred choice for other record‑setting bridges. It now holds over 65 percent of the high‑end market for expansion joints on mega bridges.
Innovation That Evolves
While ROABY expansion joints were being installed on the Hangzhou Bay Bridge, deck paving technologies for major bridges in China were still largely sourced from overseas. That prompted Our founder to develop a paving solution with the same focus on innovation.
After a decade's efforts, we claimed the ECO polyurethane paving technology—a system that contains no asphalt, uses 100% polymer materials, and enables rapid, single‑pass application with intelligent automated equipment. Satatistically, our solutions perform well in the material strength, temperature stability, corrosion resistance, and service life in demanding environments and projects with tight schedules.
The ECO Pavement Technology has been recognized by national authorities for its innovation and commercial value. It demonstrates advantages in product quality and cost‑effectiveness.
Key Figures
235 expansion joints on a single bridge from ROABY
Zero main‑component replacements since opening
