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Identify the spillway crest gate, which consists of a hollow steel cylinder or drum spanning between the piers constructed on the crest of the spillway.

Identify the spillway crest gate, which consists of a hollow steel cylinder or drum spanning between the piers constructed on the crest of the spillway. Correct Answer Rolling gates.

Explanation:

Rolling gate:

  • It consists of a hollow steel cylinder as large in diameter as the height of the opening and spanning between the piers.
  • Each pier has an inclined rack.
  • The gate is wound around the periphery of the cylinder.
  • The gate is also attached to the incline rack with the help of toothed gears.

Additional Information

Bear-trap gates:

  • Bear-trap gates are also known as movable drum gates.
  • A bear trap gate consists of two leaves of steel, with one leaf hinged on the upstream side and the other on the downstream side over the crest.
  • The bear trap gates are suitable for low navigation dams.
  • These gates have a wide base but a deep recess is not required.
  • These gates may be designed to operate automatically.

Drum gate:

  • Drum gates are useful for longer spans of the order of 40 m or so and medium heights of 10 m.
  • The drum gate consists of a segment of a cylinder that may be raised above the spillway crest or may be lowered into the recess made into the top of the spillway.

Tainter gate:

  • A tainter gate(or radial gate) has the upstream face cylindrical.
  • The axis of the segment of the cylinder forming the u/s face is horizontal.
  • The face is formed of a steel skin plate shaped to a segment of a hollow cylinder supported on a steel framework.

Related Questions

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