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桥梁是公路的重要组成部分,桥梁养护的好坏直接关系到公路车辆行车的安全与畅通。维修养护的目的是经常保持其完好状态,并延长其使用寿命。反之,桥梁失养,则必使桥梁处于病害状态,带病工作,即包含着安全隐患,亦将大大缩短其使用寿命。在构建和谐社会的今天对交通运输提出了更高的要求,反映在公路运输上是交通量猛增,运输车辆的载重量加大,公路运输对公路桥梁的通过能力和承载能力的要求越来越高,而一些旧桥老化、破损现象日趋严重,许多旧桥难以适应日益增长的交通量需要。 相似文献
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伴随经济发展,交通量需要日益增长,桥梁负载问题日趋明显问题。加固旧桥,让旧桥有更好的承载力,保障交通运输安全,这是现今和以后亟待解决的难点。本文主要叙述了旧桥加固的方法、原则,还有新桥旧桥如何衔接等各种问题。 相似文献
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李长军 《建筑·建材·装饰》2009,10(1)
旧桥加固可提高旧桥的承载能力,确保交通运输的畅通安全.桥梁的加固方法主要有:塞缝灌浆,上部构造改建,旧桥下部结构加固,旧桥基础加固,桥面铺装层的加固.同时,要加强公路旧桥的管理,使其处于正常的工作状态. 相似文献
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公路旧桥加固技术探讨 总被引:2,自引:3,他引:2
结合近年来对超限运输桥梁及大中型桥梁的加固实践,分别对旧桥上部结构、下部结构、旧桥基础、桥面铺装等部位的加固处理方法进行了介绍,以提高旧桥的承载能力,确保公路旧桥的交通运输安全。 相似文献
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随着桥梁的长期使用以及自然环境对桥梁的风吹日晒和霜打雨淋,桥的上下结构都会受到不同程度的损伤。所以必须要对旧桥进行加固,以保证桥梁的正常使用和交通的安全。因此,碳纤维预应力筋(板)作为新技术逐渐应用在旧桥加固中。 相似文献
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针对老桥中原来桥梁的加固与拓宽问题,对其病害的类型及其产生的原因进行了分析,介绍了几种老桥的病害处理方法和旧桥加固方法,从而确保桥梁施工质量。 相似文献
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浅析公路桥梁养护与管理 总被引:1,自引:1,他引:0
重点分析了目前公路桥梁养护存在的突出问题,提出了加强桥梁养护的措施,并在此基础上提出若干建议,从而保持桥梁的完好工作状态,延长其使用寿命。 相似文献
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Joan R. Casas & Angel C. Aparicio 《Computer-Aided Civil and Infrastructure Engineering》2001,16(6):444-454
The traffic of special overloaded trucks (special permits) over bridges may create structural problems not only in the time of crossing but also in the service life of the bridge (cracking in concrete bridges affecting their durability, fatigue in steel bridges, etc.). Therefore, the owner agency responsible for a bridge network should look carefully at the maximum loads acting on the bridges and the problems they may cause according to their actual condition. This article presents the work carried out by the authors concerning the possibility of passage permission of overload permits in the main highway network of Spain. Most of the bridges are quite new and very well documented, but also older bridges are present whose documentation is not available. The work is summarized in a bridge management system (BMS) installed on a PC. The computational model performs the structural analysis of the bridges crossed by a defined special vehicle in a quick and automatic way and compares the results with the maximum allowable actions over the bridge, the result being authorization or not of the passage. The computational models are developed for most common bridge types in the network and are of limited value for very complex structures such as cable-stayed or suspension bridges. The BMS is now in use in the complete trunk road system in Spain. The software developed has shown its usefulness in assisting bridge engineers in the decision-making process of permit passage. 相似文献
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对在役桥梁结构来说,一旦出现缺陷,就要中断或限制服务,这样就会造成巨大的经济损失.本文分析了目前我国在桥梁管理中存在的不足,借鉴国外工程实践中的相关概念,在桥梁管理中引入"用户成本"的概念,并根据国内桥梁管理的特点对其进行了更新.在工程经济学原理的基础上,提出了基于用户成本的桥梁管理策略.对于多个受损桥梁都需要进行维修、修复、加固或重建时,将会提高项目优先权决策的科学性,使有限资金发挥最大的效益. 相似文献
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AbstractBridge dynamics and aerodynamics have been in many cases overlooked in the design stages and consequent low behaviour performance and safety margin have been not rarely observed and detected by means of structural monitoring of the bridge soon after it is brought into full service. In this paper, a selection of important issues regarding design and practical requirements for a high structural performance of main components of conventional and cable-stayed bridges are pointed out and discussed briefly. The paper encompasses sections describing some relevant aspects regarding the numerical and physical modelling of the structural system and the mathematical modelling of the dynamic and aerodynamic loads. Special attention is given to the dynamic interaction between vehicles and structures of roadways and railway bridges and also to the aeroelastic analyses of bridges′ behaviour and their consequent implications on the structural performance of a bridge during its service life. Case examples of actual bridges subjected to dynamic forces produced by the traffic of heavy vehicles and by the wind action are explored to depict the main sources of problems which in some cases caused structural misbehaviour. Some practical measures to improve the behaviour and performance of bridge structures are outlined. 相似文献
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桥梁顶升技术作为一种新型的桥梁加固纠正技术,在国内外现代桥梁建造中应用非常广泛。本文介绍了桥梁顶升技术的基本原理和技术分类,对于其技术构成和应用范围进行了讨论,希望能够为顶升技术的应用和推广提供参考。 相似文献