Lift lock
Lift locks, also known as ship lifts or boat lifts, are an alternative to conventional canal locks.
Lift locks are a kind of elevator for vessels. In operation, vessels proceed from a river or canal into a basin or caisson, doors then close, and the entire basin is raised or lowered. When it reaches the level of the other section of the canal or river doors open, and the vessel can proceed on its voyage.
Among the advantages lift locks hold over traditional canal locks are that a single lift lock can raise vessels over a vertical distance that would require multiple canal locks. Conventional canal locks require using large amounts of water, because the entire lock has to be filled every time a vessel traverses the lock. Most lift locks do not require moving water from the upper level.[1]
Many lift locks use a pair of counter-balanced basins. Some of the larger lift locks, like the shiplift at the Three Gorges Dam, in China, and the shiplift at Strépy-Thieu in Belgium, on the other hand, have just a single basin, counter-balanced with a conventional counter-weight, like a regular elevator.
| location | displacement[2] | dimensions | vertical lift | cycle time |
|---|---|---|---|---|
| Three Gorges Dam | 3000 tons | 280 x 35 meters x 5 metres | 113 | 30-40 minutes |
| Strépy-Thieu | 1350 tons | - | 73.15 | |
| Peterborough, Ontario | 1300 tons | 42.7 x 10.1 x 2.1 metres | 19.8 metres | 10 minutes |
| Kirkfield, Ontario | 1300 tons | 42.7 x 10.1 x 2.1 metres | 14.9 metres | 10 minutes |
| Falkirk Wheel | 600 tons | - | 35 metres | 4 minutes |
| Danjiangkou dam, China | 450 tons | |||
| Geheyan dam, China | 300 tons | |||
| Longtan dam, China | 250 tons | 40×10.8×1.8 metres | 68.5 metres | claimed to be the "fastest ship-lift in the world" |
| Alderton Boat Lift | 250 tons | 22.9 x 4.7 x 2.9 metres | 15.25 |