A chain bridge is a bridge in which chains, cables or ropes hanging between the banks form both the railing and the load-bearing structure. In its simplest form there is a thick walking rope with two ropes at hip height as a railing; in heavier versions several metal chains carry a wooden walkway. The bridge sags under load and can sway, giving it the look of a hammock.
How it works
- The chains are firmly anchored into both banks or into abutments
- The tensile forces are taken up by the chains and led to the anchorage
- The walkway (planks or a grating) hangs from or rests on the chains
Application
- Footbridges over rivers, gorges and ravines, especially in mountainous terrain
- Historic bridges — the chain bridge is a direct forerunner of the modern cable suspension bridge
- Recreation — as an adventurous crossing in parks and nature areas
Points to note
- The bridge moves and springs; this calls for a good anchorage and a safe railing
- Large versions resemble a suspension bridge, but in a true suspension bridge the deck hangs from vertical hangers under a single main cable
- Metal chains need rust protection and regular inspection
Related terms
- Suspension bridge
- Arch bridge
- Beam bridge
- Bridge
- Cantilever
Want to learn more about construction terms? Visit our knowledge base at fredsdiyplans.com.