摘要研究目的：拢口部分的设计是既有线改建设计工作的重要内容，然而目前国内外针对拢口计算机辅助设方面的研究尚不多见，为提高拢口部分设计的质量，本文研究了拢口计算机辅助设计的方法，并采用Visual C + + ． net 2002 开发平台以及Object ARX 二次开发技术，研发了拢口计算机辅助设计模块。
Abstract：Research purposes: The design of the closure mouth is an important work for reconstruction of existing railway． However，there is a little research on the computer － aided design method ( CAD ) for the closure mouth of the existing railway at home and abroad． To improve the design quality of closure mouth，the study was done on the computer － aided design methods for the closure mouth，and the CAD model was developed by using the Visual C + + ．net2002 development platform and ObjectARX secondary development technology．
Research conclusions: The module was successfully applied in upgrading of the Chengdu － Chongqing railway． The application showed the module interface was friendly and its performance was stable． It could automatically search the scope of the closure mouth，calculate the plane and vertical data of the closure mouth according to the given track space，detect the plane data that got out of line，gave alarm for the mistaken information with tracing indication to the mistaken area，and rapidly and accurately draw the plane and cross － section drawings． It could provide a audio － visual platform for the designer to check the design rationality of the closure mouth to improve the design quality．
胡建平. 既有线改建拢口计算机辅助设计方法研究[J]. 铁道工程学报, 2011, 28(10): 106-110.
HU Jian － ping. Study on CAD for Reconstruction of Closure Mouth of Existing Railway. 铁道工程学报, 2011, 28(10): 106-110.
Zhong Jing，Pu Hao，Peng Xianbao． Conversion of CAD System Development and Research of Vertical Section of the Existing Railway ［J］． Railway Survey，2007( 6) : 67 －69．
［6］ 王磊，既有铁路平面改建CAD 系统理论与方法的研究［D］． 长沙: 中南大学， 2008．
Wang Lei，Reconstruction of Existing Railway Plane CAD System Theory and Method ［D］． Changsha:Central South University， 2008．
2011, Vol. 28 
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