1964年11月在兰州召开了全路路基专业优秀图紙选拔会,会上有些設計院与鉄路局带来了较成功的路塹边坡坡面防护用的护牆个别設計图,由于这些护牆設計使用条件较特殊,供重复使用是有困难的,故未选上。但与会同志均感到这些图紙本身还是优秀的,作为交流經驗,对大家会有很大启发,可以增加設計人員的思路,为此,简要介紹如下。为防止路堑边坡坡面风化削落而做的护牆,一般不宜超过二极,每級从12～15米高,再高施工时须搭脚手架,圬工升高都会感到困难,可能造价还会超过明洞。但是,以往在設計铁路新綫时,对“早进洞晚出洞”,尽量避免做高填深挖的設計原则,贯彻得很不够,給不 November 1964 in Lanzhou held a full selection of excellent road subgrade drawings selected at the meeting, some design institutes and Muli Road Bureau has brought more successful cut slope slope protection with the wall of the individual design drawings, because these walls Design conditions of use is more special, for repeated use is difficult, it is not selected. However, comrades at the meeting all felt that the drawings themselves were still excellent. As an exchange of experiences, they would be very inspiring to all of us and could increase the thinking of designers. To this end, the brief introduction is as follows. In order to prevent the weathered wall of the cutting slope from weathering, it is generally not suitable to exceed the dipole. Each level should be from 12 to 15 meters high. When scaffolding is required for further construction, it will be difficult for workers to raise the workforce. Will exceed Myeong-dong. However, in the past, when designing a new railway line, it was not enough to implement the design principle of “digging holes late in the morning as early as possible”