IHI Infrastructure Systems Co.,Ltd.

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Erection of cables of suspension bridge

Air spinning (AS) construction method

- World's top class suspension bridge cable "Aerial erection technology" -

The cable erection of a suspension bridge has two methods - namely, the Air Spinning (AS) method and the Pre-fabricated Parallel Wire Strand (PPWS) method. 
Unlike other manufacturers, IHI has experience in the erection of overseas suspension bridges using the AS method. Through long experience, IHI has developed and established know-how on the AS method, including quality control, high-speed erection, adaptation to longer span bridges, and improved AS erection machineries which enable 24 hours seamless operation.

The Air Spinning Method is a method to erect cables, by spinning small 5mm dimension wires one by one. To span these wires, firstly the wire is reeled onto a U/R Winch, then it is pulled out from the U/R Winch (Unreeling / Reeling Winch) by a carrier, making round trips over the catwalk. The wire is placed around the strand shoe and fixed to anchorages on both sides. By repeating the above process, the cluster of wire thickens, and in uniting them together, a cable is made.
We use the low tension control method, in order to ensure quality and workability.

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