The geometrically combined relation of the syncline stucture with the pit controls the mechanical effect of the stuctural plane and rock mass structure. 向斜構造與采場的幾何組合關係控制著結構面和岩體結構的力學效應。
Structure of coke oven bridge pipe and valve body are introduced,in which several structures are respectively reviewed.Notices for application and design are put forward. 介紹了煉焦爐中橋管與閥體結構的形式，分別對幾種結構形式加以評述，指出了今後設計時應注意的問題。
