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林区公路测量关键的工作是选线,但却苦于在外业时不能确知其选线是否符合标准。一般要经过内业设计后,才能鉴别选线质量的高低和是否符合标准,故此非常被动。又因是室内设计,不可能随时与实际地形对照,当发现纵坡过大或填挖工程量太多时,就要返工移线,或以大填大挖来符合纵坡的标准。这样,既影响测量进度,费工费时,又难于取得较合理的设计,且对初学者亦不易于掌握。现将一实用的选线方法介绍如下。
The key task of highway surveying in the forest area is to select the line, but it is difficult to know in the field when its route is up to standard. Generally, after passing the internal design, it is very passive to identify the quality of the selected line and whether it meets the standards. Because it is an interior design, it is impossible to compare it with the actual terrain at any time. When it is found that the vertical slope is too large or the amount of work for the excavation is too much, the line must be reworked, or large-scale excavation is required to meet the criteria of the longitudinal slope. In this way, it will not only affect the progress of the survey, it will be difficult to obtain a more reasonable design, and it is also not easy for beginners to grasp. A practical line selection method is described below.