目的研究具有外环桁架的肋环型索穹顶的构件布置和特点，提出确定初始预应力分布的快速计算法。
The purpose of this paper is to investigate characters, initial prestress distribution and its quick calculation method of Geiger dome with outer truss torus.
中压型金属密封环(m型)将压力径侧孔或槽引入管内，以便加大密封环之反应力。
Medium pressure metal ring (m type) conduct the pressure into the pipe though the hole of path and groove to increase the reaction strength of metal ring.
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