拱桥改造及效益

本文着重介绍世界银行贷款项目－苏南路网改造三期工程镇江－广德公路漂阳境内中河桥拱桥的改造利用。利用原拱桥的测试依据、新桥桩基测定，提出了老桥改造和加宽方案。最后总结了其经济效益。     

梁式体系桥梁拼接施工分析

通过对312国道扩建工程常州段老桥的拓宽改造介绍,分析了老桥拓宽改造中的抬梁法和叠合梁法的适用范围和施工要点,以解决老桥拓宽改造问题,为今后其他老桥改造拓宽的施工提供了一定的经验。     

南城桥二次拓宽改建技术研究

在路网改造中,由于原有桥涵等级低、线形不畅及老化破损,加之沿路建筑、河道的制约等,使老桥改造成为道路改建的关键和难点。通过对南城桥二次拓宽改造的方案优化过程、主要技术措施及改建成效等方面的阐述,探讨中小桥梁老桥改建技术。     

七道河桥的可靠性评估及加固改造

通过对湖北七道河中桥的老桥加固改造工程,介绍了在无设计资料的情况下,采用可靠性评估—加固改造—评估为一体的方法,巧妙地解决了复杂条件下老旧双曲拱桥的加固改造方案实施,叙述了拱上建筑改造治理、主拱圈加固等老桥加固改造的具体措施。改造完成后的静载试验及近一年来的运营证明,采用的加固方法是成功的,取得了较好的经济效益和社会效益。     

桃园老桥加固改造

介绍了X011线桃园桥承载力不足及部分结构出现裂缝的情况，并就其病害成因进行了分析，提出了压浆和增大截面相结合的加固技术方案，指出利用老桥进行加固改造具有投入少，施工简便的优点。     

某二级公路桥梁拓宽改建设计方案

以某二级公路桥梁拓宽改建设计为实例,分析了该桥梁的现状,结合相关技术标准,对老桥利用的可行性进行了研究,从上部结构及桥面铺装、下部结构、基础等方面提出了老桥拓宽的改建方案,并采取了减小差异沉降的措施,达到了良好的运营效果。     

安徽省公路网改建项目桥梁加固浅析

针对路网项目中老桥荷载等级低的特点,文章分析了老路改造应对老桥加固的必要性,归纳总结出桥梁加固的几种方法,给路网项目桥梁的设计、施工和建设提供了一定参考依据。     

福州洪塘大桥总体设计和技术创新

洪塘大桥位于福州西郊,跨越乌龙江连接仓山区与闽侯县,原桥位拓宽改建为双向8车道的城市主干路跨江大桥。工程包括三环立交改造、老桥拆除和建新桥。新建主桥采用独塔自锚式悬索桥,引桥采用钢-混凝土组合梁桥。桥梁首创采用三阶段横向拼接施工的新老桥建拆思路,以实现施工期间"保通车"。桥梁采用主缆平弯锚固系统、无涂装耐候钢、带底钢板的结合桥面板、独特的老桥拆除方法等多项创新技术。     

251省道房顶闸桥（右幅）维修改造方案分析

以251省道房顶闸桥(右幅)维修改造项目为依托,在交通量调查分析基础上,对老桥的调查评定结果及病害原因进行分析,提出房顶闸桥(右幅)维修改造方案,为其他类似桥梁的维修改造提供参考。     

带挑梁的整体桥面板拓宽提载技术研究与应用

从经济节约及结构可行性等方面综合考虑采用带钢筋混凝土悬臂挑梁的整体式桥面板对篁碧老桥进行拓宽提载改造,使得桥梁的技术标准得到提高,达到了理想的效果。     

Bridge performance indicators based on traffic load monitoring

The assessment of the existing road bridges as a part of bridge management networks has been a subject of several European research projects and actions in the last few decades. Bridge management includes a series of activities, interconnected in order to achieve optimal balancing of required costs, potential risks and overall bridge performance. This paper discusses a valuable link between a specific indicator (traffic load information calculated using Bridge Weigh-in-Motion measurement data) and the corresponding structural performance (reliability of existing bridge). It is shown that implementation of weigh-in-motion measurements in the probabilistic assessment of existing road bridges can reveal hidden bridge reserves and predict bridge reliability development over the required lifetime. Consequently, such approach can yield an unrestricted use of the bridge over a much longer remaining service life. Broader advantages lie in an improved road network management, road bridges in particular, and in a more sustainable development of infrastructure network and greater satisfaction of road users and owners.     

路桥施工管理问题及应对策略

路桥施工对一个城市的发展有着重要的影响，我国在积极发展路桥施工管理的同时，仍不可避免的存在一些问题，本文从路桥施工管理的重要性和必要性、路桥施工管理问题的分析及发展趋势进行了研究与探讨，重点是从问题中寻找解决策略。     

Management system for road bridge structural bearings

Support bearings used in road bridges frequently account for a major part of the maintenance budget of the corresponding bridges. In addition, there are considerable indirect costs and inconveniences resulting from rehabilitation operations and consequent interruption of traffic. This paper presents an innovative management system for support bearings used in road bridges. The system encompasses the development of a classification system of bridge support bearings, their anomalies and possible causes, inspection and diagnosis methods, and maintenance and rehabilitation techniques, linked by appropriately validated correlation matrixes. Based on a set of parameters that define degradation levels, the system allows evaluating each defect in terms of physical and functional deterioration and social impact. Priorities for action can then be set according to the parameter considered most critical: anomaly, bearing, bridge or road section.     

论述道路桥梁工程的原材料检测

文章首先介绍了道路桥梁工程中进行原材料检测的重要性,然后分析了道路桥梁工程原材料检测过程中需注意的要点,之后分别介绍了道路桥梁工程中原材料的检测方法。最后,根据道路桥梁工程原材料检测工作中存在的问题提出了几点建议。     

公路路桥设计及其早期损坏原因探究

系统分析了公路路桥在施工设计方面存在的问题,探讨了公路早期损坏现象出现的原因,并结合实际提出了预防道路早期损害的具体措施,以保证公路路桥的整体施工质量。     

道路桥梁工程中沉降段路基路面施工技术探讨

以北京至乌鲁木齐国家高速公路山西段道路桥梁工程为例,从桥头沉降段的具体设计结构以及桥台背路堤的压实度、桥头引道地基处的现存设计问题切入,对引出路桥沉降段中路基路面的深层原因展开了详尽的分析,然后对路桥建设中沉降段内路基路面的可用施工技术加以阐述,继而保障好道路桥梁总体上的施工质量。     

桥梁桩基旁地铁施工总结

阐述了地铁区间段在经过既有城市道路桥梁桩基时,采取的围岩加固、监控量测措施及地铁施工对既有桥梁的影响,为桥梁桩基旁地铁的设计及施工提供了宝贵经验。     

浅谈县乡公路桥梁技术改造和养护管理

结合我国现有公路桥梁的实际运营状况,针对检查中发现的病害,介绍了不同构件部位的病害应采取的不同处置方法,总结了目前桥梁日常养护工作中存在的问题,并提出了桥梁养护建议,以提高县乡公路桥梁日常养护管理水平。     

应用型本科院校土木工程专业路桥课程群建设改革研究

结合应用型本科院校土木工程专业路桥课程群的建设改革,剖析了当前路桥课程群教学中存在的问题,分析了课程群建设的原则,从课程群教学知识点优化重组、教学内容工程化改革、网络平台课程资源建设、师资队伍工程能力培养、学生专业社团建设等几方面入手,对路桥工程课程群进行改革研究和实践。实践表明,路桥课程群建设改革切实可行且效果明显。     

Frontier of continuous structural health monitoring system for short & medium span bridges and condition assessment

It is becoming an important social problem to make maintenance and rehabilitation of existing short and medium span(10-20 m) bridges because there are a huge amount of short and medium span bridges in service in the world. The kernel of such bridge management is to develop a method of safety(condition) assessment on items which include remaining life and load carrying capacity. Bridge health monitoring using information technology and sensors is capable of providing more accurate knowledge of bridge performance than traditional strategies. The aim of this paper is to introduce a state-of-the-art on not only a rational bridge health monitoring system incorporating with the information and communication technologies for lifetime management of existing short and medium span bridges but also a continuous data collecting system designed for bridge health monitoring of mainly short and medium span bridges. In this paper, although there are some useful monitoring methods for short and medium span bridges based on the qualitative or quantitative information, mainly two advanced structural health monitoring systems are described to review and analyse the potential of utilizing the long term health monitoring in safety assessment and management issues for short and medium span bridge. The first is a special designed mobile in-situ loading device(vehicle) for short and medium span road bridges to assess the structural safety(performance) and derive optimal strategies for maintenance using reliability based method. The second is a long term health monitoring method by using the public buses as part of a public transit system (called bus monitoring system) to be applied mainly to short and medium span bridges, along with safety indices, namely, “characteristic deflection” which is relatively free from the influence of dynamic disturbances due to such factors as the roughness of the road surface, and a structural anomaly parameter.