Tub boat lift

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Kahnhebehaus Halsbrucke Kahnhebehaus Halsbrucke Modell Stadtmuseum Freiberg.jpg
Kahnhebehaus Halsbrücke
Kahnhebehaus Halsbrucke Kahnhebehaus Halsbruecke.jpg
Kahnhebehaus Halsbrücke

A tub boat lift is a type of boat lift designed to lift tub boats between different elevations of a canal. Tub boats are small boats used to transport coal and other minerals, sometimes working singly, sometimes in long trains. A tub boat lift (German : Kahnhebehaus) lifts the boat out of the water. Most other types of boat lift such as locks or inclined planes are designed to move the boat afloat in some kind of water-filled tank, and, apart from maximum dimensions, are not restricted in the type of craft transported. Tub boat lifts and tub boats are designed to work together as a system. A given lift will only be able to lift boats designed for the lift.

Contents

Operation

Tub boat lifts consisted of a moveable hoist travelling on four toothed wheels engaging with two toothed wooden rails, one mounted on each supporting wall. The hoist possessed two drums around which the lifting cables were wound. The lifting ropes passed through pulley blocks before being attached to lifting eyes on the boats to make the lift easier. Four men would wind the hoist when lifting a full 2.5 to 3 tonne tub boat until it was high enough to pass over the dam of the upper canal.

Examples

Kahnhebehaus Grossvoigtsberg Kahnhebehaus Grossvoigtsberg.jpg
Kahnhebehaus Großvoigtsberg

The remains of two tub boat lifts can still be seen, in the same region of Germany.

See also

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Ketley Canal

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Caisson lock

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Tub boat

A tub boat was a type of unpowered cargo boat used on a number of the early English and German canals. The English boats were typically 6 m (19.7 ft) long and 2 m (6.6 ft) wide and generally carried 3 long tons to 5 long tons of cargo, though some extra deep ones could carry up to 8 long tons. They are also called compartment boats or container boats.

Wombridge Canal

The Wombridge Canal was a tub-boat canal in Shropshire, England, built to carry coal and iron ore from mines in the area to the furnaces where the iron was extracted. It opened in 1788, and parts of it were taken over by the Shrewsbury Canal Company in 1792, who built an inclined plane at Trench. It lowered tub boats 75 feet (23 m), and remained in operation until 1921, becoming the last operational canal inclined plane in the country. The canal had been little used since 1919, and closed with the closure of the plane.

James Green (1781–1849) was a noted civil engineer and canal engineer, who was particularly active in the South West of England, where he pioneered the building of tub boat canals, and inventive solutions for coping with hilly terrain, which included tub boat lifts and inclined planes. Although dismissed from two schemes within days of each other, as a result of construction problems, his contribution as a civil engineer was great.

Fonseranes Water Slope

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References

  1. Hans-Joachim Uhlemann. Canal Lifts and Inclines of the World.

Further reading