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1963年11月,专业院在北京召开了涵洞标准設計山口鋪砌座談会。参加单位有第一、二、三、四設計院,北京,錦州鉄路局,华北鉄路工程局以及北京煤矿設計院等单位,基建总周、工务局、铁道科学院也出席了会議。会議准备在鉄道科学研究院所进行的涵洞水力試驗获得完滿結論以前,就目前涵洞設計存在的問題,共同制定一些临时措施,以保証涵洞标准設計的編制工作正常进行。現将該会議情况报导如下: 1. 会議决議各类型涵洞标准图的出口鋪砌設計均采用无沟槽平鋪形式。对于涵洞出口有天然沟槽的情况,大家認为这种沟槽的地形变化很不規则,沟槽寬度亦是多种多样,按假想天然沟槽进行标准設計,与实际情况将有很大出入,因此会議建議对有沟槽的出口鋪砌,标准設計仅作一算例,以供現場参考使用。 2. 出口鋪砌的长度及鋪砌形式問题。对于无沟河梢的出口鋪砌,大家認为,鋪砌长度与末端的冲刷深度有关,但一些計算表明,过份加大鈾砌长度对减少末端垂裙的帮助不大。但如何确定合理的鋪砌长度,还有待
In November 1963, the professional academy held a standard design of culvert in Yamaguchi to hold a pavement in Beijing. Participants are the first, two, three, four design institutes, Beijing, Jinzhou Kushiro Road Bureau, North Kushiro Engineering Bureau and Beijing Coal Mining Design Institute and other units, Infrastructure Week, Works Bureau, Academy of Railway Science also attended the meeting. Before the meeting is ready to reach a complete conclusion on the culvert hydraulic test conducted by the Tao Science Research Institute, some temporary measures are to be worked out for the existing problems in the current culvert design so as to ensure the normal design of the culvert standard design. The meeting is now reported as follows: 1 meeting resolution of all types of standard drawings of the export pavement design are used trenchless tiling. For natural culvert exit situation, we believe that the topography of this groove is very irregular changes in the width of the groove is also diverse, according to the design of the standard natural groove, and the actual situation will be very different Therefore, the meeting proposed to pave the export of trench, the standard design is only an example for the site reference. 2. Export paved the length and paving the form of the problem. It is believed that the length of the paving is related to the depth of the scour at the end, although some calculations suggest that increasing the length of the uranium lining is of little help to reduce the length of the end skirt. But how to determine a reasonable length of paving, remains to be seen