基于ANSYS的盾构机工作井支护结构刚度合理化设计

以南京过江隧道盾构井工程为例,利用ANSYS软件建立工作井有限元模型,分析连续墙水平位移和围檩、支撑的受力。通过有限元法结果与现场监测结果的对比,说明该有限元方法模拟基坑的开挖过程、探讨基坑墙体变形规律的可行性。通过正交试验结果的评定,得到各因子对控制指标影响大小,合理化配置了支护结构的刚度。     

明挖基坑内支撑体系施工方案优化及受力分析

以北京市南水北调配套工程东干渠一标1号盾构井施工为例,在原施工方案的基础上进行了结构优化设计,并对优化后的支撑结构体系进行了结构安全性检算,研究了深基坑钢围檩、钢支撑对整体钢结构支撑体系的受力影响,为合理布置钢支撑提供参考依据。     

深基坑桁架式钢混内支撑梁的微差爆破拆除施工技术

淮安雨润中央新天地项目基坑内1区设置有4道水平支撑,2区设置5道水平支撑,基坑周边围檩处为边桁架式支撑,基坑内为纵横向桁架式支撑。在支撑梁拆除施工中,根据基坑及支撑梁的特点,采用微差爆破拆除施工,通过工程实践总结形成工法,可在以后的工业与民用建筑深基坑支撑梁拆除施工中推广应用。     

装配式预应力鱼腹梁钢结构支撑技术的应用

对装配式预应力鱼腹梁钢结构支撑的技术原理进行了介绍,结合工程案例,阐述了该支撑结构的施工工艺流程,着重对立柱、三角托架、支撑围檩、托座、支撑梁安装等施工技术作了阐述,并介绍了该技术的优点,可为其他项目基坑支护支撑体系提供参考。     

地铁车站围护结构桩间初期支护模筑混凝土施工的新方法研究

厦门地铁3号线2标五工区车站围护结构均采用钻孔灌注桩+旋喷桩桩间止水,而钻孔灌注桩作为围护结构的城市地铁基坑开挖时,需对基坑侧围护桩进行填平处理,喷射混凝土施工方法施工步骤多,周期长,成本高,基面平整度差,且对环境污染大,本工法介绍了一种地铁车站围护结构桩间初期支护模筑混凝土施工的新方法,该方法对基面外观质量可控,线型顺直,基面平整,利于防水板敷设,且钢围檩及钢支撑安装顺直,标高及轴线位置控制较好,围檩背后无脱空现象,基坑支撑安全系数较高,弥补了传统围护桩间喷射混凝土施工时混凝土表面平整度差、线性不顺直、桩间渗漏水的缺陷。     

钢板桩在铁路桥梁深基坑支护中的应用

通过杭甬客专某水中墩深基坑工程的设计与施工,介绍了钢板桩在深基坑支护工程中的应用,从钢板桩的长度计算、支撑和围檩的结构检算以及钢板桩、围檩、支撑的安装要点等方面进行了系统的叙述,通过实践证明,板桩式基坑支护具有良好的工程性能和可重复利用的特性,在满足支护结构强度、刚度要求的同时还具有较好的经济效益,是一种较为合理的支护形式。     

深基坑斜支撑钢围檩等强连接研究

北京地铁隧道明挖深基坑工程多采用桩+内支撑系统作为基坑围护体系,这种围护体系具有支撑刚度大、基坑变形小、内支撑可重复利用等特点,更符合城市复杂环境下基坑支护要求,同时更符合绿色施工要求。但是目前内支撑体系在设计和施工方面存在钢支撑构造不规范、斜撑钢腰梁抗剪构造不合理、钢围檩连接不规范、土方开挖与设计工况不一致等不足。本文以北京地铁6号线一期五路居站明挖基坑围护结构施工实践为基础以钢围檩连接的方法和连接位置为研究对象,通过理论计算和现场试验总结出钢围檩连接相对合理的方法,供广大地铁建设者参考。     

临时围檩与永久结构结合的应用与探讨

在临轨地区,深基坑支护采用地下连续墙+水平支撑的方式,常规水平支撑随下部结构施工依次拆除,特殊工况下需水平支撑上部结构施工完成后,返回拆除水平支撑,即板底闷拆。文章以苏州新区污水处理厂项目基坑工程的设计和实施为背景,对支撑围檩与永久结构的连接以及施工缝的防水施工技术的设计、实施做了比较详细的介绍,为同类工程的实施提供借鉴和参考。     

HCMW工法结合圆环内支撑基坑支护设计

HCMW工法是一种新型的基坑支护形式,其结合混凝土圆环内支撑可有效地保护基坑周边环境。以采用HCMW工法进行基坑支护的泰兴国际大酒店二期工程的设计和实施为背景,对该支护形式应用于基坑工程中的特点进行了初步分析;对预制工字形桩与混凝土冠梁、围檩的连接,以及混凝土圆环内支撑的设计等作了详细的介绍,最后根据计算结果与现场实测情况分析了实施的效果。     

拉森钢板桩支护在综合管廊施工中的应用

深基坑开挖支护工程的支护方案选择能有效减少施工安全隐患,提高施工效率,节约施工工期。通过支护方案的选择可减少施工单位和建设单位的成本。结合工程案例,重点分析深基坑开挖支护施工中拉森钢板桩支护和围檩支撑系统的结构,总结出深基坑开挖施工过程中基坑支护的围护和钢围檩支撑施工的质量安全控制要点和施工工艺。     

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.