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Hydraulic Gates

Hitachi Zosen has a history of more than 100 years as a manufacturer of hydraulic gates and penstocks. We have delivered many large and middle-sized gates for dams and rivers including high-pressure dam gates and large river gates, and also penstocks and steel pipes. Based on such experience, we help to prevent disasters and conserve the environment by building safe and reliable gates: we develop control techniques for large flap gates for tsunamis, as well as disaster-prevention measures at existing facilities; we offer implement maintenance, repairs, and improvement; and we aim to contribute to the further sophistication of facilities and the building of a safer Japan.

Major products

Gates for dams and rivers

A gate for a dam is a facility used to control the huge water pressure stored in a dam lake. In addition to facilities for flood control, which is the main purpose of a dam, there are many kinds of controlling facilities, including flow adjustment facilities to keep the flow level of a river stable, selective water intake facilities to take in water of a suitable temperature, and facilities to control the murky water of a dam. Gates for rivers are facilities used to control the river water. These include floodgates installed in rivers or at river mouths that normally keep the water level of a river stable and let water flow rapidly during flooding, and sluiceways and water gates to take water from a river or to split flow.

Temporary closing facilities for redevelopment of dams
(Maintenance and redevelopment)

We have installed many self-recording systems to help confirm the soundness of operation of facilities or to find defects at an early stage, as well as temporary closing facilities for redevelopment of dams, thereby effectively using existing infrastructures. For the temporary closing facilities for dam redevelopment, we are trying to reduce building costs and use resources effectively as well as securing safety for underwater operations using the know-how we have accumulated so far.

Hydraulic Gate Operating Status Management/Diagnostic System Shinemon



Shinemon console, Nakagawa sluice gate (roller gate) control room

This system automatically acquires data during regular operation and statistically processes this data in software so that highly reliable deterioration indices can be provided. It can also be effectively applied in finding causes during troubleshooting.

  • Acquired data

  •   Current value, equipment voltage, opening,
      rope slack time rope tension

  • Deterioration indices

  •   Startup current, operating current,
      operation count, operating time,
      startup time, rope bend count, rope tension,
      machine efficiency, pulley efficiency

    Major records of delivery

    1975 First visitor gate in Japan (Aji-River Hydraulic Gate-Osaka Prefecture)
    1983 First stainless steel shell-type fixed wheel gate in Japan (Ozayahimon Central Hydraulic Gate-Kumamoto Prefecture
    1986 First internal elevator facility for a dam in Japan (Tase Dam-Tohoku Regional Bureau)
    1987 The world's first large-sized sediment-flushing facility, upstream on the Kurobe River, built on a JV with Mitsubishi Heavy Industries, Ltd. (Dashidaira Dam Sediment Flushing Facility-Kansai Electric Power)
    1988 First stainless steel multistep straight fixed-wheel gate in Japan (Tamagawa Dam Water Intake Facility-Tohoku Regional Bureau)
    1989 First temporary closing facility for dam redevelopment construction in Japan (Yoroibata Dam Temporary Closing Facility-Tohoku Regional Bureau)
    1994 Japan's largest high-pressure-type radial gate, planned water depth: 115.288 m (Miyagase Dam Main Discharge Facility-Kanto Regional Bureau)
    2004 Japan's largest jet flow gate, planned diameter: 2,800 mm (Surikamigawa Dam Main Discharge Facility-Tohoku Regional Bureau)
    2009 Japan's largest high-pressure slide gate (Obara Dam Flood Control Discharge Facility-Chugoku Regional Bureau)
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