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在进行道路纵断面设计时,如纵坡变更大于设计准则规定的数值,就须插入竖曲线。在山岭复杂地区,纵坡较大,变更纵坡地段较多,因此需要设置竖曲线的地方就愈多。为简化竖曲线设计中的计算工作,编有竖曲线测设表。目前所见的竖曲线测设表有两种:一种是“圆形竖曲线测设表”(中央交通部公路总局译印);另一种是“公路纵断面上竖曲线设计新法”(安东诺夫著,汪新宁译)。但这两种表在使用上都还存在着某些缺点。
In the design of the longitudinal section of the road, if the longitudinal slope changes greater than the value specified in the design guidelines, the vertical curve shall be inserted. In complex mountain areas, the longitudinal slope is large, and there are many places for changing the longitudinal slope. Therefore, the more places where vertical curves need to be set up. To simplify the calculation of vertical curve design work, compiled with vertical curve measurement table. There are two kinds of vertical curve measuring tables currently seen: one is “circular vertical curve measuring table” (translated by State Administration of Highway of the Central Transport Ministry); the other one is “new method of vertical curve design on highway longitudinal section” ( Antonov, Wang Xinning translation). However, there are some shortcomings in the use of both types of tables.