The utility model relates to a rotary-vane vacuum pump, which provides a column spiral torsional spring which is used for replacing a column spiral compressing spring.
本实用新型涉及旋片式真空泵，提供一种圆柱螺旋扭转弹簧，用它取代圆柱螺旋压缩弹簧。
With spiral hoops strengthen column can raise transshape capacity of vertical reinforcement and concrete when the columns are destroying.
用绕丝加固柱可以提高柱破坏时纵筋和混凝土的应变。
With spiral hoops strengthen column can raise transshape capacity of vertical reinforcement and concrete when the columns are destroying.
用绕丝加固柱可以提高柱破坏时纵筋和混凝土的应变。
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