超高大坡度散索鞍支墩混凝土施工控制技术

发布时间：2018-07-31 14:29

【摘要】：重庆绕城公路鱼嘴长江大桥主桥为(180+616+205)m单跨双立铰简支悬索桥,北锚散索鞍支墩为超高大坡度混凝土结构,倾斜67°。受大倾角的影响,在支墩混凝土浇筑过程中支墩会产生变形,墩底外边缘会产生拉应力。鉴于此,采取主动克服散索鞍支墩混凝土自重的方法,对支墩承载膺架结构和液压设备布置进行设计,设计确定将承载膺架安装在锚体内箱室中,按2个受力面、2个支承面形成箱式结构设计,采用万能杆件拼装,并在3道横梁处各布置8台液压设备,分阶段主动起顶。结构计算结果表明,该控制技术可以有效控制散索鞍支墩各悬臂浇筑节段墩底产生的拉应力,应力满足规范要求。工程应用证明,在散索鞍分节段浇筑过程中,采用该控制技术有效地控制了墩体结构的应力,墩体结构施工满足规范要求。
[Abstract]:The main bridge of Yuzui Yangtze River Bridge is (180 616 205) m single span and double hinged simply supported suspension bridge, and the north anchor saddle pier is of super high slope concrete structure with an inclination of 67 掳. Under the influence of large inclination angle, the pier will be deformed and the outer edge of the pier will produce tensile stress during the concrete pouring of the pier. In view of this, adopting the method of overcoming the concrete deadweight of the loose cable saddle pier, the bearing frame structure and the hydraulic equipment arrangement of the pier are designed, and the design determines that the load-bearing corrugated frame is installed in the inner chamber of the anchor. The box structure is designed according to two bearing surfaces and two bearing surfaces. The universal bar is assembled and 8 hydraulic equipments are arranged at each of the 3 beams. The results of structural calculation show that the control technique can effectively control the tensile stress at the bottom of the cantilever pier of the saddle support pier, and the stress can meet the requirements of the code. The engineering application proves that the stress of the pier structure is effectively controlled by the control technique in the process of pouring the loose cable saddle section, and the construction of the pier structure meets the requirements of the code.
【作者单位】：中铁大桥局股份有限公司;
【分类号】：U448.25;U445.4

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