Quick Answer: What Makes Zhaozhou Bridge Distinctive?
The Zhaozhou Bridge (赵州桥, Zhàozhōu Qiáo), also called the Anji Bridge (安济桥, Ānjì Qiáo), is a Sui-era stone bridge over the Xiao River in Zhao County, Hebei. Its broad main arch carries the crossing, with two smaller arches in each shoulder above it.[1][2][4]
- Main span: A shallow arch spans about 37 metres between the banks.[1][2]
- Open shoulders: Four smaller arches leave openings in the stonework above the main arch.[1][2]
- Benefits: The openings reduce the mass of the bridge and give high water additional places to pass.[1][2][3]
Those choices combine a low crossing profile with a span that leaves the main channel open.[1][2]
Start with the silhouette. The middle opening is wide and relatively low, and four small openings appear higher up, two toward each bank. Each size of opening tells you something about the bridge’s load, the approach from the banks and the passage of water.[1][2][3]
Why the Main Arch Is Broad and Shallow
The main opening is a segment of a circle. For the same span, a semicircular arch would rise about half as high as it is wide. At Zhaozhou the rise is about 7 metres, around one-fifth of the span. The low profile makes for gentler approaches than a higher arch in comparable terrain. The span reaches from bank to bank without a central pier in the river.[1][2][4]
A stone arch carries much of its load through compression along its curve, passing forces to the supports at the ends. The bridge is built from parallel curved stone ribs across its width, with iron connections helping tie the construction together. That fabric is one of the features a side view does not fully reveal.[1][3]
What the Four Shoulder Arches Do
The shoulder areas between the main arch and the deck could have been filled with stone. Here, two small arches on either side keep parts of that space open. Leaving openings removes some dead load, and the small arches transfer the load around the openings.[1][2][3]
At ordinary water levels, the main opening gives the river a route beneath the deck. During high flow, water can also reach the shoulder openings. That helps explain why the open-spandrel form matters beyond the outline of the bridge. Compare the structural idea with other Chinese stone arch bridges whose shoulders and spans serve different sites.[1][2][3]
What Repairs and Recovered Stones Tell Us
The association with Li Chun comes in part from a Tang text identifying the structure as the work of the Sui craftsman. It is evidence for the builder’s attribution from a later period.[2]
Restoration work recovered carved stones and repair inscriptions from the riverbed. The National Museum of China catalogues one dragon-carved railing panel as likely Sui based on its carving and comparison with a historical description. Other fragments belong to later periods. The surviving structure and the recovered pieces preserve different parts of the bridge’s history.[2]
FAQs About Zhaozhou Bridge Engineering
Who built the Zhaozhou Bridge?
Historical sources attribute the bridge to the Sui craftsman Li Chun. The American Society of Civil Engineers gives 605 CE as its completion date.[1][2]
What is an open spandrel?
On this bridge, it is the area above the curve of the main arch where small arches leave spaces open between the main span and the deck. There are two small openings on either side.[1][2]
Are all the stones on the bridge original?
The bridge has been repaired over time. Historical railing stones, recovered carving fragments and repair inscriptions document multiple phases of the structure’s history.[1][2]
出典
[1] American Society of Civil Engineers. Zhaozhou Bridge Historic Landmark
[2] National Museum of China. Carved Stone Balustrade Panel From Anji Bridge
[3] Engineering History and Heritage. Spanning Over 1400 Years: China’s Remarkable Zhaozhou Bridge
[4] Changchun Institute of Technology. The Anji Bridge