港珠澳大桥多功能旋转吊具设计与应用技术

发布时间：2018-10-09 21:44

【摘要】：港珠澳大桥浅水区非通航孔桥采用85m连续组合梁桥,下部结构采用预制装配式结构,承台、墩身及墩帽在预制场内整体分节预制,共分137个预制构件,最大重量2 370t。预制构件运输吊装过程中,除需要纵横向移动外,还需要在悬吊状态下将预制件转动90°对位安装,且安装精度要求高,设计了一种2 500t级多功能旋转吊具,辅助"小天鹅"号运架一体船运输安装施工。吊具由上层平移梁、中层旋转梁、下层梁及液压系统等部分组成,采用有限元软件建立其模型,按最不利工况进行加载,计算得到吊具应力和变形满足要求。施工时,首先采用"小天鹅"号将预制构件运至墩位,进行抛锚定位作业,然后通过多功能旋转吊具的平移功能,进行第二次调整,下放预制构件,最后利用简易三向千斤顶准确调整轴线偏位和垂直度。实践表明,从绞锚进位到安装完成只需6h,安装精度高,平面位置偏差均控制在8mm以内,垂直度均小于H/3 500。
[Abstract]:In shallow water area of HongKong-Zhuhai-Macao Bridge, 85m continuous composite beam bridge is used for non-navigable hole bridge, and prefabricated structure is used for the substructure. The cap, pier body and pier cap are prefabricated in the precast yard, with a total of 137 prefabricated components with a maximum weight of 2370 t. In the process of transportation and hoisting of prefabricated components, in addition to the longitudinal and horizontal movement, it is also necessary to rotate the prefabricated parts 90 掳in the suspension state, and the installation accuracy is high. A kind of multi-function rotary lifting gear of 2 500 t is designed. Assist the "Little Swan" carrier transport installation construction. The suspension is composed of the upper translational beam, the middle rotating beam, the lower layer beam and the hydraulic system. The finite element software is used to establish its model, and the load is carried out according to the most unfavorable working conditions, and the stress and deformation of the suspension are calculated to meet the requirements. During construction, the "Swan" is first used to carry the prefabricated members to the pier position, and then the anchor location operation is carried out. Then, through the translation function of the multi-function rotary hoist, the second adjustment is carried out and the prefabricated components are lowered. Finally, the axis deviation and perpendicularity are accurately adjusted by a simple three-way Jack. The practice shows that it only takes 6 hours to carry the stranded anchor to the completion of installation, the installation accuracy is high, the plane position deviation is controlled within 8mm, and the perpendicularity is less than H / 3500.
【作者单位】：中铁大桥局集团第五工程有限公司;
【分类号】：U445.3

【相似文献】