东非某水工工程重力式老码头改扩建设计及施工要点

Design and construction points of reconstruction and extension of an old gravity wharf in East Africa

东非坦桑尼亚某水工项目为改扩建工程,3^(#);~4^(#)泊位交接段原有码头为重力式结构和高桩反梁大板结构,建于20世纪60年代。改扩建设计保留原有重力式结构,采用悬臂高桩承台结构、高桩梁板结构、高桩承台结构进行混合结构设计,最大限度减少作用在原有重力式结构上的荷载,保证结构稳定。陆侧最远部分纵梁施工采用杂填土底模,能减少支撑体系的消耗。保留高桩反梁大板结构的混凝土面层作为灌注桩钢护筒施工平台,能缩短灌注桩施工周期。

A hydraulic project in Tanzania is a reconstruction and expansion project.The original pier of the transfer section of berths 3^(#)-4^(#)is a gravity structure and a high-piled,reverse-beam and large-slab structure,which was built in the 1960 s.The original gravity structure is retained in the reconstruction and expansion design.The cantilever high-pile cap structure,the high-pile beam plate structure,and the high-pile cap structure are used for mixed structural design to minimize the load acting on the original gravity structure and ensure the stability of the structure.The farthest part of the longitudinal beam on the land side is constructed with miscellaneous filling bottom form,which can reduce the consumption of the support system.The concrete surface layer of the high pile,reverse beam and large slab structure is reserved as the construction platform of the cast-in-place pile steel tube,which can shorten the construction period of the cast-in-place pile.