高速公路连续配筋混凝土路面的施工

随着我国交通运输业的不断发展,高速公路工程项目随之增多。连续配筋混凝土路面以其自身的诸多优点,在高速公路建设中获得了广泛应用。基于此,就高速公路连续配筋混凝土路面施工要点进行了分析,以期为同行提供一定的参考与借鉴。     

水泥混凝土滑模摊铺施工技术

水泥混凝土路面施工中陆续研制开发了轨道摊铺机和滑模摊铺机等现代化大型施工机械,在路面类型上发展了钢筋混凝土路面、连续配筋混凝土路面、低噪音混凝土路面,进一步推动了水泥混凝土路面的发展.结合日南路尉许段路面四标段,介绍了水泥混凝土路面的滑模摊铺施工技术.     

高速公路沥青混凝土面层施工技术

文章针对当前高速公路沥青混凝土路面建设情况,介绍了高速公路沥青混凝土面层施工准备工作与技术要点,并结合广西贵港至合浦高速公路工程实例,分析了高速公路沥青混凝土面层施工技术与质量检测要求。     

高速公路路面工程中沥青混凝土技术的应用

文章阐述了广西高速公路建设情况,介绍了高速公路路面工程中沥青混凝土技术的应用要点,并以广西梧州至柳州公路№C标段为例,分析了沥青混凝土路面施工方案与工艺,为类似工程项目提供参考。     

沥青路面大修罩面施工技术探讨

沥青混凝土罩面施工技术能够有效地消除破损、完全或者部分恢复路面的平整度,从而起到改善路面性能的作用,因此在高速公路大修养护工程中得到广泛应用。文章结合高速公路大修养护工程实例,探讨沥青路面大修罩面施工技术,以期对类似工程起到借鉴作用。     

筋岑高速公路道路混凝土施工质量控制技术

文章结合筋岑高速公路水泥路面工程,从道路混凝土混合料的原材料变异性控制、搅拌工艺、密实成型工艺和初期养生等方面,介绍了高速公路水泥混凝土路面施工的质量控制技术,供类似高速公路水泥路面工程参考。     

高速公路改扩建工程加铺沥青混凝土施工分析

文章阐述了我国高速公路改扩建情况,介绍了旧水泥混凝土路面改造方法,并结合兰海高速公路钦州至防城港段改扩建工程实例,分析了高速公路改扩建工程加铺沥青混凝土施工方法的具体应用。     

改性沥青混凝土路面施工技术探讨

改性沥青混凝土路面具有使用寿命长、养护工程小、施工操作简单、能源消耗小等特点,对各种不同等级的公路具有较好的适应性,在公路施工中广泛应用。结合具体的高速公路施工实例,简要探讨改性沥青混凝土路面的施工技术,希望能对类似工程起到借鉴作用。     

水泥混凝土路面病害综合处治技术初探与实践

文章结合广西桂林至柳州高速公路工程,介绍了水泥混凝土路面存在的主要病害与发展趋势,从设计、交通量、施工、养护管理、自然环境方面分析了水泥混凝土路面的损坏原因,提出了针对性的水泥混凝土路面综合处治技术。工程实践证明,综合处治技术的成功应用,可有效延长路面的使用寿命。     

高速公路改性沥青混凝土路面施工技术

高速公路路面施工对沥青混凝土的性能要求较高,采用常规沥青混凝土路面施工技术,路面容易出现泛油、裂缝等问题。基于此,文章以改性沥青混凝土路面施工技术为研究对象,从改性沥青混凝土确定、技术工艺流程等方面提出改性沥青混凝土路面施工技术要点,以期有效提升高速公路路面工程质量,保证路面稳定性。     

Analysis of factors affecting the choice of route of pedestrians

Pedestrians as compared to vehicular traffic enjoy a high degree freedom of movement even in heavily congested areas. Consequently, there are more alternative links available to pedestrians between a given origin‐destination (O‐D) pair. This paper describes a study done by the University of Calgary to evaluate the factors affecting the choice of route on intra‐CBD trips or trips within the Central Business District (CBD).

An origin destination survey conducted in downtown Calgary, Alberta enabled the identification of the most significant factors influencing the choice. These factors were analyzed in relation to the physical characteristics of the location, personal characteristics of the trip maker and the type of the trip.

It appears that most people chose the shortest link and factors such as the level of congestion, safety or visual attractions were only secondary. This suggests that the length should be made a major consideration when planning and designing pedestrian links.     

输油管道中原油乳状液的流变性研究

原油乳状液的流变性是原油开采后在管道中输送的重要研究方面,为了更好地研究这一性质,采用电动搅拌机、偏光显微镜以及流变仪等仪器来测定不同含水率的原油乳状液在不同条件下的黏度,观测不同含水率的原油乳状液在偏光显微镜下的形态。并且分别对原油乳状液的黏度与含水率之间的关系以及与剪切速率之间的关系进行研究,初步确定了所测区块原油乳状液的转相点以及该区块原油乳状液的流变特性,为生产中的油气集输提供了理论依据。     

Preliminary results of an analysis of areas of influence in Shanghai

The main deficiency of most current modeling approaches to transportation can be identified as neglect of the integration of existing geographical knowledge in regard to the ex ante transport/land use modeling approaches, with its focus on territorial dynamics and theory development. This paper addresses this aspect of the problem by introducing a theoretical and methodological framework for the analysis of the interrelationship between land uses. The analysis attempts to determine to what extent the functional land use in a city can be considered an ordered pattern. The order sought does not rely on purely spatial configurations, but on the correlation of transportation and land use. The first section of this paper focuses on theoretical considerations. It stresses the fact that conventional approaches do not apply in the present context. It then suggests an alternative based on areas of influence and measured in terms of level of attractance of land uses. The second describes a procedure based on this alternative following the remarkable contribution of Hanjoul, Beguin and Thill. An application of this procedure to the analysis of Shanghai is then examined. Finally, an evaluation of the strategies for optimizing the interrelationship between land uses is presented. The paper concludes with a possible research agenda.     

城市轨道交通杂散电流监测系统概述

介绍了城市轨道交通工程中杂散电流不同的监测系统的构成,分析了集中式、分散式和智能型等监测系统的配置和功能,以及智能型实时在线监测系统的重要意义,为轨道交通工程杂散电流监测系统的选择与应用提供参考。     

埋地管道防腐保温层失效评价

明确埋地管道防腐保温层的技术评价标准,对埋地钢质管道的安全运行,延长管道使用寿命具有重要意义。为了对埋地管道防腐保温层做出有效评价,从间接检测与开挖检测2个方面,结合现场检测数据,提出了基于防腐保温层的电流衰减率、绝缘电阻率、质量状况与厚度的分级评价标准及基于4种评价指标的综合评判方法。工程实践表明,该评价标准对防腐保温层是否存在失效能做出有效判断。     

实现多组态计量软件集中监控的可行性分析

天然气自动计量系统有多种组态软件,由于软件的不相通性,造成了计量系统数据采集的通用性差、数据传输与入库的时效性差、数据利用的可靠性低.结合各组态软件的实际情况,从设计上充分利用Oracle大数据处理能力以及Partition(分区表)的特性,实现历史数据的存储,应用WebService与COM+数据访问组件提供多层数据访问架构,采用OPC与DDE工业数据交换协议,实现了各站场计量数据的实时上传,为连续数据采集和实时监控提供了可能,节约了改造成本.     

注汽管道承压能力评估和实物试验验证

基于失效评估图技术对某注汽管道进行了承压能力评价,给出了管线在不同腐蚀壁厚情况下的极限承压能力和极限裂纹尺寸。并利用实物爆破试验验证了评价方法的安全性和有效性,通过对爆破断口进行宏观和微观分析,发现管段的开裂属于脆性开裂。     

Direct analysis of the perceived importance of attributes of reliability of travel modes in urban travel

Reliability of travel modes was found to be the most important characteristic of transportation systems in several attitudinal investigations of individual travel behavior. This paper represents the first part of a research effort aimed at gaining a better understanding of the characteristics of reliability of transportation modes in urban travel. In this research, reliability characteristics are identified; their importance relative to each other is assessed, and an insight into possible structure of an objective reliability index is discussed. The research is based on perceived values of reliability, which were identified through a large attitudinal survey conducted in the Chicago metropolitan area.     

盾构隧道管片接头抗剪力学性能研究

通过对南京长江盾构隧道环向管片接头进行的三组原型抗剪(无螺栓剪切、有螺栓逆剪和有螺栓顺剪)加载试验,分析研究了管片接头在剪力作用下的受力、变形和破坏特征,给出了管片接头混凝土接触面的静摩擦系数,得到了接头剪力主要由混凝土接触面承担、破坏形式为连接斜螺栓剪切延性破坏的结论。通过对管片结构的有限元数值模拟计算得出:接头处的剪力与轴力比小于接缝面的摩擦系数,管片不会发生相互错动,结构是稳定的。     

Non-parametric analyses of efficiency of airports

This paper estimates the efficiencies and productivity changes of 12 international airports in the Asia-Pacific region based on data from 1998 to 2006. We apply stochastic frontier analysis (SFA) to compute efficiency estimates and use the Malmquist productivity index (MPI) to analyze productivity changes. We use the SFA model with a translog-type production function after testing the statistical hypotheses. According to the results of the SFA hypothesis tests, airports have experienced a technological regression; the deviations from the efficiency frontier are caused more by technical inefficiency than random noise. However, the inefficiency was found to decrease. The MPI reveals a declining trend resulting more from technological change than from efficiency change, with a decrease in inefficiency. Taken together, both the hypothesis tests and the MPI not only provide consistent conclusions, but also suggest that airports should concentrate on technological progress.