平潭海峡公铁两用大桥航道桥基础设计与施工创新技术

发布时间：2018-01-05 14:15

本文关键词：平潭海峡公铁两用大桥航道桥基础设计与施工创新技术　出处：《铁道标准设计》2017年09期 　论文类型：期刊论文

【摘要】：平潭海峡公铁两用大桥为国内第一座跨海峡公铁两用大桥,桥址海域风大、浪高、水深、流急、潮汐显著,且岩面倾斜起伏大、裸岩硬岩分布广,气象水文及地质条件均十分复杂,尤其是桥址海域波流力巨大,为桥梁下部结构设计和施工带来前所未有的困难。为解决风浪作用和通航船撞力作用,3座大跨度通航孔斜拉桥在基础设计和施工中采用多项创新技术,首次选用鐖4.5 m的钻孔桩;为解决复杂海域大直径钻孔桩难题,研发了KTY5000型动力头钻机和相关配套的打桩设备;为克服波浪力作用,部分深水裸岩区域采用导管架辅助建立施工平台;为适应桥位独特的海洋环境,3座大跨度通航孔斜拉桥主塔墩承台均采用圆端哑铃形高桩承台,承台顶露出高潮位以上,承台施工采用集主体防撞结构与施工围堰一体的防撞箱围堰结构,永久结构与临时结构相结合,节约材料的同时降低了施工的安全风险性。其大型防撞箱围堰采用工厂整体制造、整体吊装、整体下放,实现模块化、标准化施工,哑铃形承台系梁范围采用无封底混凝土施工创新技术。
[Abstract]:Pingtan strait bridge is the first cross-straits bridge in china. The bridge is located in the sea area with strong wind, high wave, deep water, rapid current, remarkable tide, and large rock face inclination and undulation, and wide distribution of bare rock and hard rock. The meteorological, hydrological and geological conditions are very complex, especially in the sea area of bridge site, which brings unprecedented difficulties for the design and construction of the bridge substructure, and solves the wind and wave action and ship collision force. Three long-span cable-stayed bridges with navigable holes have adopted many innovative techniques in the design and construction of the foundation, and the bored piles of 4.5 m have been selected for the first time. In order to solve the problem of large diameter drilling pile in complex sea area, KTY5000 power head drill and related piling equipment are developed. In order to overcome the wave force, some deep water bare rock areas use jacket to establish construction platform. In order to adapt to the unique marine environment of the bridge, three long-span cable-stayed bridges with navigation holes are covered with round end dumbbell high pile cap, and the top of the cap is above the high tide level. The construction of the cap adopts the anti-collision box cofferdam structure which integrates the main body anti-collision structure and the construction cofferdam, and combines the permanent structure with the temporary structure. The large anti-collision box cofferdam is manufactured by the factory as a whole, hoisted as a whole, integrated down, modularized and standardized construction. Dumbbell-shaped cap girders range using non-sealing bottom concrete construction innovation technology.
【作者单位】：中铁大桥局集团有限公司;
【基金】：中国铁路总公司科技研究开发计划项目(2014 G004-D)
【分类号】：U443.1;U445.4
【正文快照】： materials,but also reduce construction safety risks.The large scale collision protection box cofferdam ismanufactured completely in plant and handled wholly to fulfill modular and standardized construction.Innovative technology of concreting without bott

【相似文献】