高速公路预制 T 梁护栏钢筋整体预埋工法研究

为解决传统预制T梁防撞护栏钢筋安装施工中焊接量大、质量控制困难及施工安全性低的问题,文章基于实际项目,通过对护栏钢筋构件各部分作用解析,采用护栏主体钢筋整体加工制作并预埋、护栏顶帽钢筋现场焊接的工艺。工程应用结果表明：通过预制T梁护栏钢筋整体预埋工法,可减少材料用量及焊接工程量,提高施工效率及质量,提升施工安全性。     

市政道路管线施工技术措施

结合济南长清大学城1#路改造工程,对比选择了较为合理的管线施工工艺,详细阐述了沟槽开挖、管道铺设安装、砖砌检查井、雨水口砌筑、沟槽回填等施工内容,探讨管线施工技术措施的实用性。     

连续刚构高墩施工托架预压技术

大河边特大桥主桥为预应力混凝土连续刚构桥，主墩上部结构箱梁1-0-1＇#块段采用预埋牛腿托架法施工方法，文章介绍该桥施工中采用的预应力施载的托架预压技术。     

沉井法在输水管道顶管施工中的应用

为更好地开展长距离及地下工程项目,对沉井法在输水管道顶管施工中的应用进行研究。从工艺原理、沉井参数以及工艺流程等角度分析沉井参数的确定,从施工技术出发,分别通过测量放线、开挖工作坑、沉井下沉施工、顶管及输水管道安装和地貌恢复,详细分析沉井法在输水管道顶管施工中的应用。同时结合沉井施工的优势,认为将沉井法应用于输水管道顶管施工能够有效推动相关工程的建设。     

大口径管道站场工艺安装预制化的应用

针对西气东输靖边压气站的扩建施工,介绍了施工图的分解,管道的预制与安装,以及在顸制中出现的问题及解决方法.通过采用预制化工艺,确保了扩建工程的质量和施工进度.     

激光数据采集在主管道ADS-4接管打磨中的应用研究

基于AP 1000依托项目热试期间发生的主管道热段振动超标问题及现场打磨反馈,利用相贯线原理,通过优化主管道打磨的数据采集方式,采用激光跟踪仪采集主管道热段管身及ADS-4接管的数据并拟合分析,确定打磨进给量,分步实施粗打磨和精打磨,从而实现了接管材料打磨去除量的精确控制,有效保证了管道的打磨作业质量.另外,通过采用仿...     

路灯基础植筋的施工方法

在桥梁路灯基础等结构工程的施工中,因施工干扰、人员疏忽等原因,常出现钢筋预埋位置不准或未预埋的情况。结合马巷至新圩道路工程A合同段工程施工实例,介绍路灯基础植筋的施工方法,该工程采用植筋胶植筋法,可以有效降低预埋筋未设置时补设预埋筋的施工难度,保证了施工质量且有效缩短了施工周期。     

龙江大桥高水位筑岛桥墩基础施工技术

文章结合龙江大桥3#墩基础施工实例,对桥墩高水位筑岛围堰的施工方法进行探讨,着重介绍了土石筑岛围堰、水下承台施工等桥墩基础施工技术。     

建筑暖通安装工程施工质量的控制与管理

供热管道安装是建筑工程施工中的重点环节,如果在管道安装方面存在质量问题,则会给人们的日常生活造成一定影响。所以,施工企业应注重暖通安装工程的施工控制,从细节入手加强施工质量管理,完善相应的管理体系和规章制度,要求各级人员按照制度要求操作,保证施工质量和施工安全。文章从建筑暖通安装工程的施工角度出发,进一步探讨建筑暖通安装工程施工质量的控制与管理,并提出相应管理措施。     

不同核电设计体系管道应力分析载荷后处理研究

不同核电设计体系对管道应力分析载荷后处理的要求也不相同,Pipestress后处理程序POSTR功能强大且开放性较强,但相对M310和AP1000后处理的相关要求却针对性较弱。支架载荷、接管载荷、管道位移输出时无法自动对指定工况进行载荷组合。文中通过对AP1000、M310载荷后处理组合要求的深入分析,研究如何在Pipestress环境下利用POSTR程序实现不同核电体系的载荷组合要求,并形成标准命令流,从而达到了减少出错几率,提高工作效率的目的。     

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.     

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。     

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。     

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.