直埋预热安装技术在供热工程的应用

本文介绍了直埋供热管道常用的敷设方式,重点介绍了直埋预热安装在实际供热工程中的应用及在设计和施工中应注意的问题。     

电预热技术在城镇供热直埋保温管道安装中的应用

本文理论与实践相结合,详细介绍了管道的预热安装方式,分析了几种管道预热方式的优缺点,在此基础上,重点介绍了电预热的基本原理、电预热技术及电预热设备在国内直埋管道工程中的应用情况,本文对电预热技术在国内直埋管道工程中的广泛应用具有重要的指导意义,对国内直埋管道安装技术的发展具有重要的推动作用。     

浅谈直埋热力管道设计计算及安装构造的要点

本文就直埋热力管道的强度设计计算方法及安装构造要点作简单的介绍,从直埋管道的破坏方式、强度验算及稳定验算等方面分析了直埋管道的失效方式及进行应力验算的方法,并就防止薄弱部件的破坏提出具体的设计方法。     

无补偿冷安装直埋敷设方式的探讨

本文简要介绍热水管道直埋敷设方式,从管道布置形式、施工难度、运行维护及经济性等方面分析无补偿冷安装直埋技术的优势。并针对采用无补偿冷安装直埋技术的大口径直埋供热管道,对设计和施工中的技术关键点进行了分析并提出了相应措施。实践证明,无补偿冷安装技术可以保证供热管网安全、经济地运行,应该进行推广。     

试论城市直埋供热管道施工技术

介绍了城市供热管道直埋敷设的技术要求和设计方法,从直埋管段基坑开挖、垫层施工、套管安装、直埋供热管安装等方面着手,对直埋供热管道施工技术进行了阐述,并总结了施工中应注意的问题,达到了良好的施工效果。     

直埋无补偿冷安装技术在长输管线中的应用

本文简要介绍供热管道直埋敷设方式,从管道安全性、经济性等方面分析直埋无补偿冷安装技术的优势。但在实际工程中仍会遇到各种各样的问题,有时这些问题非常棘手。设计直埋供热管道的强度时应该积极采用不同的技术措施,这样才能避免因管道性质不同从而产生不同应力对管道的破坏,因此我们需要研究选择不同的安装方式要具体问题具体分析,针对不同的管段采用不同的措施,这样才能够使得直埋热管道有效运行。     

如何提高直埋供热管道安装工程质量探讨

集中供热是我国北方城市的主要供暖方式,随着城市规模不断扩大,城市供热管道铺设范围越来越广,同时也导致管道故障层出不穷。在本文的研究中,对直埋供热管道安全性进行分析的基础上,对于直埋供热管道安装阶段的故障保证措施进行研究,以期在直埋供热管道安装阶段,通过采取适当的措施来提高直埋供热管道的安装质量及安全性。     

直埋热水供热管道敷设方式比较

对热水供热管道的无补偿冷安装直埋敷设与有补偿直埋敷设的设计方法、管道布置形式、施工难度及运行维护进行了比较。结合工程实例,对采用两种敷设方式的设计结果及经济性进行了比较。无补偿冷安装直埋敷设的设计方法比有补偿直埋敷设复杂,其管道布置形式、施工难度、运行维护及经济性均优于有补偿直埋敷设。     

直埋供热管道的预热安装方式

针对敞沟预热和一次性补偿器预热两种直埋供热管道预热安装方式进行了介绍，分别阐述了两种安装方式的概念、特点、适用范围及相关参数的计算方法，指出实际工程中应根据各种情况选择相应的预热安装方式。     

供热管道直埋敷设方式探讨

从循环塑性变形、循环疲劳损坏、失稳等方面,介绍了供热管道遭受损坏的方式与作用机理,对比分析了补偿冷安装、敞沟预热安装以及一次性补偿器覆土后预热敷设三种供热管道直埋敷设方式的优缺点,以供参考。     

浅析高速公路工程招投标中的最低评标价法

结合目前高速公路施工项目招投标活动的实际情况,阐述了最低评标价法的概念,归纳了其优点及存在问题,对完善最低评标价法提出几点策略,以期促进招标投标市场更加规范有序。     

Place-Making in Megaprojects in Melbourne

This article analyses state-led place-making practices in Melbourne. The two levels of government that influence planning in Melbourne make much of the city as ‘culturally vibrant’ and ‘creative’, and have incorporated creative city-inspired place-making principles into many layers of the planning system. An examination of the development of two mixed-use megaprojects in central Melbourne reveals however that ideals of culturally engaging public places, and indeed of creative landscapes for middle-class consumption, wither in the face of more basic imperatives for economic development. In these case studies the ‘creative city’, no matter how the idea is interpreted, has little traction either as a set of inclusive place-making principles or as a gentrification strategy. The article concludes that the creative city-inspired place-making objectives in the planning system at both state and local levels are ambiguous in their overall intents and completely unsupported by statutory controls. Such place-making objectives as are realised are the compromised results of the interplay of uncoordinated decisions, delivered at the pleasure of the developer.     

Pathogens in septage in Vietnam

Septage is widely acknowledged as a major source of infectious pathogens while disposal of septage, and the operation and maintenance of septic tanks, is not regulated in many developing countries. Twenty untreated septage and septage sludge samples were taken from Can Tho City, Vietnam to examine their pathogen content, and indicator micro-organisms. Escherichia coli and Enterococcus spp. were detected in all samples, regardless of sludge storage time. Phages were detected in 80% of samples. Salmonella spp. were detected in 70% of the untreated septage and 60% of septage sludge samples. Concentrations of phages and bacteria tested in septage sludge after many years of tank storage were much higher than the expected levels. Helminth ova were present in 95% of untreated septage samples with an average of 450 ova l^− 1, and were detected in all septage sludge samples with an average of 16,000 ova l^− 1. Twelve varieties of helminth ova were identified. More helminth ova varieties in higher concentrations were found in septage than those reported from stool samples. The varieties' frequency ranged from 10% to 50% and Ascaris lumbricoides predominated. Results show that pathogens and indicator micro-organisms, especially helminth ova, accumulate in sludge. Thus helminth ova should be considered when septage sludge is treated and used for agriculture. Proper health protection measures must be applied for people handling septage.     

在市场中实践在实践中学习在学习中进步--工程公司市场化进程的回顾与展望

近两年来，工程公司在提高市场竞争意识、推动市场化进程中做了大量工作，其中坚持走出去的方针是我们自我加压、推行加快市场化步伐的一个重要战略步骤。     

新时期广东城市化的新特点

新时期广东城市化出现以下特点:知识源导向、城市由单体向群体化发展、产业集群推动、政府主导自上而下的集约化发展、城镇化向城市化转变、由重“数量”发展向重“质量”发展的转变。     

新形势下高校强化基建财务管理的探讨

在市场条件下高校基建财务人员在加强日常财务管理的同时,必须树立起高度的工作责任心,抓好事前监督、事中监督、事后监督三个环节,全面理解、贯彻执行《高等学校财务制度》,管好用好各项基本建设资金,提高基建财务管理水平,更好地完成高校各项基建任务,以有限的投资,最快的建设速度,获得最大的投资效益。     

2005年北京办公物业市场七大趋势

趋势一:CBD区域写字楼集中放量从各区域规划方案上看,CBD区域多数项目在03～04年处于项目的报批手续及拆阶段,预计2005年正式推向市场,因此2005年CBD区域将成为北京市场供应集中的域,区域即将供应的项目有北京财富中心(二期)、金地国际花园、万达广场、SOHO尚都、万通中心、世纪财富中心、怡禾国际中心、光华国际等。除去未知项目,2005CBD写字楼办公面积的供应量为60万平方米左右。中关村区域经过一段时间的集中供后开始逐步放缓,2005年供应的体量相对较大的项目有中关村金融中心、新中关。金街区域可能开盘的项目只有2个:英蓝国际中…     

浅谈我国工程项目建设成本控制存在的问题

结合目前我国施工企业工程项目成本管理现状,对工程项目成本管理过程中存在的问题进行了较详细的分析,并提出了一些解决问题的办法,以做好项目成本控制工作,进而增强企业经济实力。     

Variation in property taxation in Tulsa

Conclusions It may be reasonably concluded from this study that the range of variation in these ratios of assessed to actual value are of a reasonable size for the great majority of cases. The frequency distribution of these sample ratios was not normal, however, as was assumed a process of this type would produce. On the other hand, the failure of the regression analysis to identify any significant variables which would explain these variations would tend to re-enforce the assumption that the fluctuations were indeed of a random nature.To sum it up in one paragraph, aside from a few extreme cases, the assessing process appears to give estimates which are more consistent than would be expected under the assumption that any errors would be of a random nature, but the regression analysis was unable to isolate any particular socioeconomic characteristics which would explain the variation which was present.Financial support for this research project was furnished by the University of Tulsa.