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A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
The gates at both ends of the upper chamber are doubled for safety. Miraflores locks Gate operating machine. The gates separating the chambers in each flight of locks must hold back a considerable weight of water, and must be both reliable and strong enough to withstand accidents, as the failure of a gate could unleash a flood of water downstream.
The 1830 design eliminated the use of culverts in the masonry, and the upper gate is below the breast wall. [25] The advantage here is that the lock can fill faster with the wickets being in the gate, but will not swamp a boat in the lock chamber. In the 1830 design locks, the upper and lower gates are both the same height. [15]
The wooden guillotine style gates are suspended in a slightly raked cast iron girder frame by a chain which passes through a small block on the gate. One end of the chain passes over two large wheels to a winch mechanism. The other end passes over two more large wheels to a hidden counterweight built into the side wall of the lock. [4]
They are both 3.5 feet (1.1 m) to 5.5 feet (1.7 m) thick. The recesses for the lower gates are still visible, as are some of the iron rings that were used to tie boats to the sides. At a later date, stone from the side walls was used to create a third wall across the lower end of the lock in an attempt to stabilize the structure. [2]
It also acts as a tidal lock, able to hold back water whichever side is higher, and can function as a stop lock (for example, Lifford Lane stop lock near Kings Norton Junction). It is mechanically more complex, however, requiring the use of a gantry and overhead lifting gear. Weurt locks on the Maas-Waal Canal, Nijmegen, the Netherlands. This ...
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