Head, shaft head, using cast iron sleeve, wear durability, lifting equipment sub-two kinds of electric and manual.
水头、轴头、采用生铁套，耐磨耐用，提升装置分电动和手动两种。
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The lifting construction projects is the construction activities in a very important sub-projects, it has unique technical characteristics, while also considerable risks.
The article studies the sub-hydraulic lifting scaffold in high-rise building design, calculation and application, and to pay for a flight in the Office building Project as an example to elaborate.