1) ring back cover
环形封底
1.
Based on the construction of the ring and back covers of steel cofferdam for the Yellow River Railway Bridge-28 # pier,the construction technology of shallow rock-socketed cap ring back cover,as well as the design and processing of the simple inner module,is introduced,providing reference for future similar projects.
结合呼准铁路黄河特大桥28#墩圆形双壁钢围堰内环形封底施工,介绍钢围堰的设计、环形封底施工工艺、施工技术及简易内模的设计和加工,为今后类似工程提供参考。
2) off endpaper
封底环衬
5) V-shaped ring V
形密封环
6) annular packoff
环形封隔
补充资料：封底
书刊的背面，跟封面③相对的一面。也叫封四。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条