下承式系杆拱桥以系杆承受水平推力，属于无推力的组合体系拱结构。
A through tied-arch bridge is a type of built-up arch structure, characterized by the horizontal thrust of arch end being balanced by its ties.
经济性好：由于G800螺杆泵专用减速机，其输出结构已设计了承受螺杆泵工作时的轴向推力，所以可以减少泵类的轴承座部件，不仅省成本而且结构又可靠合理。
Economy: because of the special design of the G800 mechanical reducer with screw pump, the bearing housing parts can be reduced. Thus, the cost is reduced and the structure is more reliable.
经济性好：由于G800螺杆泵专用减速机，其输出结构已设计了承受螺杆泵工作时的轴向推力，所以可以减少泵类的轴承座部件，不仅省成本而且结构又可靠合理。
Economy: because of the special design of the G800 mechanical reducer with screw pump, the bearing housing parts can be reduced. Thus, the cost is reduced and the structure is more reliable.
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