论文部分内容阅读
〔问〕你刊1957年第3期公路工程设计准则若干问题解说中计算平曲线超高公式i=V~2/127R—φ_2,并说明准则中规定的超高值是按设计行车速率的0.65～0.7倍计算的。可是,按照这一解说去算Ⅵ级路50公尺以上半径的弯道,根本就无需设超高了(这是指φ_2采用0.05时的情况,如果φ_2用得更小,或者V用设计的行车速率,当然还需设超高,但解说中介绍的φ_2值最小是0.05,故计算时φ_2应只能用0.05)。而准则中表2—4内却规定
[Q] You No. 1957 No. 3 road engineering design guidelines to explain a number of issues in the interpretation of the flat curve ultra-high formula i = V ~ 2 / 127R-φ_2, and shows that the provisions of the guidelines are based on the value of the high traffic value of 0.65 ~ 0.7 times calculated. However, according to this explanation, it is not necessary to set the curve of the Ⅵ level more than 50 meters. It is not necessary to set the height to be too high (this means that φ_2 is 0.05, if φ_2 is smaller, or V Driving speed, of course, also need to set high, but the description of the minimum φ_2 value is 0.05, so the calculation should be used only φ_2 0.05). The guidelines in Table 2-4 provides