| 摘要 |
PURPOSE:To improve a quake resisting property by providing an air gap between a nozzle mounted on a pressure container and a casing of a pump and providing the enlarged diameter portion of the outer periphery of casing attached close to and below the enlarged diameter portion of the inner periphery of nozzle. CONSTITUTION:An air gap 9 is provided between a nozzle 2 mounted on a pump and a pump casing 3. Said nozzle 2 has the diameter 11 of inner periphery enlarged on the ways and the enlarged diameter portion 12 of the outer periphery of casing is disposed below and close to the enlarged diameter portion 11. Thus, both enlarged diameter portions 12, 12 maintain the closely attached condition under both the cold and hot conditions of a pile to ensure a quake resisting property.
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