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我院根据国家建委(73)建革工字第209号文下达编制折叠式通行火车大门标准设计的任务,于1973年10月份起,先后到有关单位进行学习和调查,确定设计原则,编制了两套空腹薄壁矩形钢管和普通圆形铜管为骨架的中转折叠式及侧挂折叠式通行火车大门的初步设计,业经向各单位征求意见和报请建委审批。(J629)中转式折叠门从1968年进行了试制,几年来在北京、天津、石家庄等地有关工厂相继推广使用,反映良好。空腹薄壁矩形钢管侧挂式折叠门也经有关部门在授外工程实践中取得良好的效果。以上两套网标图设计是在总结这些使
Our hospital according to the State Construction Commission (73) Jian Ge Gong word No. 209 issued under the task of preparing the standard folding door design, starting in October 1973, successively to the relevant units to study and investigate to determine the design principles, prepared Two sets of fast-food thin-walled rectangular steel pipe and the general circular copper tube as the backbone of the folding and folding side-by-side folding train gate of the preliminary design, after the units to seek advice and submitted to the Construction Committee for approval. (J629) Interchange Folding Door from 1968 to trial production, in Beijing, Tianjin, Shijiazhuang and other places have been promoting the use of the factory, reflecting the good. Fast thin-walled rectangular steel tube side folding door also by the relevant departments in the engineering practice to achieve good results. The above two sets of network design is to make these conclusions