旧綫改建中控制条件比較复杂,本文所述方法只是其中之两种,可供参考。在既有犊路的改建役静工作中,为了保持既有修上的大型建筑物(桥梁、隧道等)免遭破坏,以及避免引起大量的土石方工程和其它有关的改建工程,或其它方面种种的原因。为了减少工程投查及少占用地,保持既有曲耀在平面上不动的作法,也是很有 The control conditions for the reconstruction of old lines are rather complicated. The methods described in this article are only two of them, which are available for reference. In order to maintain the existing large-scale structures (bridges, tunnels, etc.) from being damaged during the rebuilding of calves, and to avoid causing a large amount of earth-rock work and other related alterations, or otherwise s reason. In order to reduce the number of project surveys and occupy less land, it is also very good to keep Qu Yao on the plane