着重介绍了施工中由贝雷梁和钢管支柱构成的门式支架支撑系统以及理论检算和挠度计算。
The portal supportor system is emphasized which is formed of bailey beam and steel pipe support.
双圈防护网结构： 用冷拔碳钢丝焊接成网筒状卷边与网面一体，用连接附件与钢管支柱固定。
Structure: the edges are cylingder rooled with colddrawn lowcarbon steel wire, forming a whole with the mesh sheet.
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