自平衡反压式单支座更换技术研究

发布时间：2018-01-07 15:14

本文关键词：自平衡反压式单支座更换技术研究　出处：《公路交通科技》2017年10期 　论文类型：期刊论文

【摘要】：为了弥补同步顶升更换技术不足,现提出1种自平衡反压式单支座更换技术,即利用1种简易的机械式反压支撑装置对同一断面上单个支座进行更换而不影响桥梁结构的安全。首先依据新支座及垫石的尺寸对反压装置进行初步的平面设计,其次根据螺纹安全系数确定装置的螺杆直径,然后建立一系列有限元模型进行分析,从支座、钢板的变形情况和应力状态几个方面确定装置钢板的合理厚度,最终完成反压装置的理论设计。此外,可行性分析中对该技术的施工操作空间提出了要求,并举例给出了更换同一断面单个支座所需的各项施工成本,体现出该技术具有十分可观的经济性优势。与传统的同步顶升技术相比,自平衡反压式单支座更换技术对于同一断面少量支座更换的情况,具有极高的经济效益和社会效益。
[Abstract]:In order to make up for the shortage of synchronous jacking replacement technology, this paper puts forward a kind of self-balanced backpressure single bearing replacement technology. That is, a simple mechanical backpressure supporting device is used to replace the single bearing on the same section without affecting the safety of the bridge structure. Firstly, the initial plane design of the backpressure device is carried out according to the size of the new bearing and the cushion stone. . Secondly, the screw diameter is determined according to the thread safety factor, and then a series of finite element models are established to analyze the reasonable thickness of the steel plate from the aspects of support, deformation and stress state of the steel plate. Finally, the theoretical design of the backpressure device is completed. In addition, in the feasibility analysis, the construction operation space of the technology is required, and the construction costs required to replace the single bearing of the same section are given with examples. Compared with the traditional synchronous lifting technology, the self-balanced backpressure single bearing replacement technology is used to replace a small number of bearings in the same section. It has extremely high economic and social benefits.
【作者单位】：东南大学交通学院;南京博瑞吉工程技术有限公司;江苏扬子大桥股份有限公司;
【基金】：江苏省交通科学研究计划项目(2014Y27)
【分类号】：U445.7
【正文快照】： 0引言随着我国经济建设和交通运输的快速发展,作为重要基础设施的桥梁建设取得了令人瞩目的成就,大跨径桥梁建设水平跻身国际先进行列。交通运输部公路水路交通运输行业发展统计公报显示:截至2015年底,全国公路桥梁77.92万座。其中,特大桥梁3 894座,大桥79 512座[1]。上述统计

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