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    1. Spiral Concrete Corrugated Post-Tension Tube Our spiral corrugated post-tension tubes are widely used in bridges, buildings, parks and gymnasiums. We have provided a patented invention-JACK-AIVA series to meet the changing market. We have the ability to produce 2000 meters per machine due to the highly ...
    1. Spiral Corrugated Post-Tension Concrete Tube Forming Machine This spiral corruated post-tension tube/pipe forming machine is professional in producing round and flat corrugated ducts used in expressway, bridge, train and large-span post-tension concrete projects. This pre-stressed protection corrugated tube machine ...