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沥青路面就地热再生施工技术主要是对沥青旧路面的一种养护新技术,在重新就地加热、耙松、添加外加剂等材料进行复拌,使其恢复原有沥青路面功能的一种循环再生工艺,并在其摊铺的同时,同步进行一层沥青混凝土路面结构层的加铺施工技术,该工艺具有创新性和先进性。我国大量高速公路已进入路面维修期,每年将有数亿吨的废料产生,而绝大多数作为工业垃圾来处理,严重浪费资源,废料排放也会形成土地的占有和污染,采用该技术可代替新路面材料使用的同时,可以减少更多的能源浪费和废气排放,也节省了原路面铣刨、运输设备及材料,大大减低资源耗费,成本效益明显。 相似文献
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就地热再生技术作为我国道路材料回收的一项重要技术,能够将废旧沥青经简单处理后用于损伤路面的修复。基于泉州某高速公路沥青路面就地热再生工程实例,首先通过实地调研研判原有道路工程路面性能,结合混合料回收评价对再生沥青混合料材料进行组成设计;其次对施工所涉及到的各类质量控制要点展开分析;最后对热再生的质量做出检验评价。 相似文献
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文章以祥周至龙邦二级公路路面大修工程为例,介绍采用旧路油面层和水泥稳定碎石基层进行再生利用的大修施工方案,从细粒式沥青混凝土上面层、沥青碎石再生料下面层(AM-16)、沥青碎石封油层、水泥稳定碎石再生基层等方面阐述了路面各结构层施工技术要求和质量控制要点。 相似文献
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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。 相似文献
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文章针对沥青混凝土路面常见问题,从集料质量、生产设备及施工工艺等方面,提出沥青混凝土路面施工质量的控制措施,以期提升沥青混凝土路面施工质量。 相似文献
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本文结合作者实际施工经验,详细分析了就地热再生施工技术优点,并且在此基础上,结合项目案例,对高速公路施工过程中,SMA路面施工过程中就地热再生施工技术进行分析,以供参考. 相似文献
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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. 相似文献
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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. 相似文献
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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. 相似文献
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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。 相似文献
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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。 相似文献
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《Transportation Research Part A: General》1991,25(6):407-418
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. 相似文献
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Joseph N. Prashker 《Transportation》1979,8(4):329-346
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. 相似文献