Chapter two ascertains main technological factor of dong gou lock reconstructing , including forecast the cargo and volume through the lock to reason about representative type of vessel designed for through the lock and its operation organize . chapter three design the renovate engineering through ascertaining the main technological factor scale of the lock , dimension , designed water level and altitude , including design of structure of the lock , lock chamber and lock gate , and select the main technological factor and pattern of headstock gear . chapter four draws a comprehensive compare of the two design scheme of the renovate project with engineering project economy evaluation method , and makes out the recommended scheme , and furthermore , to calculate the economic evaluation index of the recommended scheme and makes the economic sensitivity analysis of the scheme and finally demonstrate economic feasibility of the scheme 本论文共分四章：第一章主要介绍了原东沟船闸的地理位置和营运现状，说明了船闸在航道建设和水资源综合利用中的作用及东沟船闸改造的必要性；第二章东沟船闸改造的主要技术因素确定其中包括东沟船闸过闸货种和货运量发展的预测，并确定东沟船闸的设计代表船型及营运组织；第三章东沟船闸改造工程设计本章通过船闸改造工程主要技术参数：船闸规模、尺度、设计水位和高程等的确定，设计了二个船闸改造方案，包括钢筋混凝土整体坞式闸首结构、闸室和闸门的设计，并选定了启闭机的主要技术参数和型式；第四章采用了工程项目经济评估方法对东沟船闸改造工程二个设计方案进行全面综合比较后，确定了推荐方案。
