Drempel (hydraulic engineering)

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The lock jam is the ledge under the lock gate directly above the water (water level in the lock on underwater). The yellow line for the official marking of the jamb can be seen on the right edge of the picture.

The threshold of the upper sluice gate is referred to as jam ( middle high German : jam = door threshold ). Like the side gate bearings, the jamb serves as a stop for the closed gate, as a watertight seal and to divert the water pressure of the headwater onto the seal bearing of the lock construction.

function

When entering the lock, the jam depth must be observed, as this dimension determines the maximum draft of the ships. So that the ship does not sit on the jamb when draining the water from the lock chamber and is damaged, the position of the jamb is marked in color (with a safety margin) on the lock chamber wall (yellow vertical line) and must be observed during the lock. The watercraft must not be closer to the upper lock gate than the marking line indicates. This is the so-called "working length marking", which is typically a few meters in front of the jamb. During locks from the underwater, you can see the jamb at some locks as a wall below the upper lock gate.

photos

  • Flap gate with jamb

  • Head with jamb and concrete wall as closure (not in operation)

See also

Web links

Individual evidence

  1. ↑ DIN German Institute for Standardization e. V. (editor) DIN 4054, September 1977, hydraulic engineering; Terms, Berlin (Germany) Beuth Verlag GmbH 1977