在鉄路設計的站埸布置中,一般均会遇到道岔前后与曲綫相連接的問题。道岔的基本轨接头,或者道岔岔跟距曲綫头究竟应有多长的直綫段,这在我国的設規中还沒有明文规定。虽然在某些設計手册上,如三院出版的“站埸設計人員手册”以及某些教科书上曾规定为: 1.当在正綫上曲綫两端有緩和曲綫时,可以不插入直綫段。 2.在曲綫两端无緩和曲綫时,则按曲綫半径的大小,及綫别的重要性规定为: In Kushiro design station layout, generally encountered before and after the turnout connected with the curve problem. The basic rail joints turnout, or turnout with curve from the end how much should be how long the straight line, which in our country there is no express provision of regulations. Although in some design manuals, such as “Station Designer’s Handbook” published by Hospitals and some textbooks, it has been stipulated as follows: 1. When there is a gentle curve on both sides of the curve in the positive line, no straight line segment may be inserted. 2. No curve at both ends of the curve, then according to the size of the curve radius, and the importance of the other lines as follows: