SMW工法桩结合预应力型钢组合支撑支护体系在软土深基坑中的应用

结合宁波某基坑工程,介绍了SMW工法桩结合预应力型钢组合支撑支护体系在软土地区深基坑工程中的应用,重点对比了预应力型钢组合支撑和钢筋混凝土支撑体系及传统钢支撑体系的优缺点,并对预应力型钢组合支撑做了较为详细的介绍。工程实践表明,SMW工法桩结合预应力型钢组合支撑支护体系安全性好,变形控制能力强,且在节约工期、节能环保等方面有较大的优势,值得进一步推广。     

软土地区深基坑中SMW工法桩+斜撑组合支护施工技术研究

文中以某高层建筑为例,对排桩+锚索支护、SMW工法桩+斜支撑两种方案进行比较分析,深入研究SMW工法桩+斜撑组合支护技术在软土地区深基坑中的应用,进一步提高SMW工法桩+斜撑组合支护施工质量及安全性,减少事故发生,以期为未来软土地区类似的基坑工程提供相关实践经验。     

前撑式注浆钢管在基坑支护中的研究与应用

在软土地区开挖基坑需进行基坑支护,软土地区传统基坑支护方法主要有灌注桩、SMW工法、水泥土搅拌桩重力坝等。目前,针对灌注桩、SMW工法中需设置水平支撑导致的挖土不便、工期较长、造价增加等缺点,文章研究了一种能够代替水平支撑,增加挖土便利,缩减工期、降低成本的新型支护方式。文章主要从安全性及适用性角度分析前撑式注钢管施工工艺,并通过该工程的成功实施进行了验证,该工程的成功经验可供其他相似工程参考。     

中等灵敏度土场地深基坑SMW工法桩设计与施工

根据昆明烟草有限责任公司"十二五"易地技术改造项目的地质条件,选择SMW工法桩为主要基坑支护结构型式,并从施工方法、基坑检测及计算分析等方面,阐述了SMW工法桩基坑设计及施工技术,总结了SMW工法桩的施工控制重点,以供类似工程借鉴。     

西安地铁明挖车站基坑工程的支护型式选择

先介绍了收集到的既有西安基坑工程实例。又介绍了地铁明挖车站施工可选择的排桩、地下连续墙、土钉墙、放坡、SMW工法连续墙等支护型式的性能、造价、工期的比较。最后针对西安地铁二号线的不同车站进行了具体分析,得出各自合适的基坑支护型式。     

SMW工法在富水非软土基坑支护工程中的应用

SMW(Soi1 Mixing Wall)工法广泛应用于海底隧道、地铁等重大项目,以及各类高层、超高层建筑的深基坑开挖支护工程等,尤其在我国沿海软土地区的基坑支护工程中,该工法取得了很快的发展,针对非软土地区的研究也取得了一定的成果。针对富水非软土的工程特征,应用SMW工法进行基坑支护结构施工,介绍了富水地层的成桩钻进施工、搅拌施工、注浆控制、芯材设置、搅拌桩施工、施工冷缝处理、插入型钢、渗漏水处理等施工技术和质量控制措施,为规范化施工积累了有效的基础资料,具有重要的实际工程意义。     

SMW工法的应用与创新

据工程实例,说明了基坑与建筑物距离过小,施工作业空间狭窄的基坑支护,采用SMW工法或SMW工法的原理,将高压旋喷桩和型钢结合起来,形成挡土和防水的复合结构,能够确保紧靠建筑物的安全稳定。从基坑支护方案的选择,技术参数的确定,施工过程、施工中的注意事项几方面阐述了SMW工法的应用,证明旋喷桩内插入型钢进行基坑支护是一种创新,具有很好的推广价值。     

SMW工法在黄土地区深基坑支护中的创新应用

西安地区对于复杂环境下的深基坑工程支护结构通常采用止水帷幕结合排桩、土钉墙或桩锚支护等。论文以西安地区首个采用SMW工法桩为支护结构的基坑工程为依托,通过对该基坑支护结构设计、施工及工程效果进行分析与探讨,得出SMW工法桩在西安地区具有一定的适用性,与传统支护方式相比,具有较大的优势,值得进一步推广。     

结合工程实例浅谈深基坑支护的技术控制要点

结合福建省地质资料库项目一期工程深基坑支护实例,对深基坑支护中的SMW工法桩施工、土方开挖、内支撑施工、基坑降排水、内支撑拆除、基坑监测等主要施工工序中的技术要点进行了阐述,对SMW工法桩进行了技术经济分析。     

软土地区SMW工法桩基坑支护应用研究

针对软土地区深基坑支护的特点,结合工程实例,介绍了SMW工法桩在实际工程中的应用,采用PLAXIS有限元软件分析基坑开挖对支护结构及周边建筑物、管线的影响。结果表明:SMW工法桩结合水平内支撑的围护形式对于面积不大,挖深较浅,地下结构工期较短,无条件选择悬臂式围护结构的基坑工程具有重要的参考价值,采用PLAXIS有限元模拟分析基坑开挖是一种行之有效的方法。     

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.     

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。     

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。     

Experiences in radon-safe building in Finland

A study was made of radon-safe buildings in 300 Finnish low-rise residential buildings using data obtained from a questionnaire study. The study also aims at finding the main defects in design and implementation and how the guidance given on radon-safe buildings in slab-on-grade houses has been followed. According to the guidelines, the prevention of the flow of radon-bearing air from the soil into the house is recommended to be carried out through installation of aluminised bitumen felt and use of elastic sealants. Second, as a precaution perforated piping should be installed in the subsoil of the floor slab. The median indoor radon concentration in the houses was 155 Bq/m3. This is 32% lower than the median of the estimated reference values. The action level of 200 Bq/m3 was still exceeded in 40% of the houses. In most houses with slab-on-grade the prevention was based only on the installation of a sub-slab depressurisation system. Sealing was performed in a low number of houses. In 80% of houses with a sub-slab piping connected to an operating fan, radon concentration was below the action level of 200 Bq/m3. In houses with piping but no fan, the corresponding fraction was only 45%. Sub-slab piping without a fan had no remarkable effect on radon concentration. In houses with crawl-space and edge-thickened slabs, radon concentrations were low. The choice of foundation system thus significantly affects the indoor radon concentration. The importance of complete and careful sealing work should be stressed in advice and guides concerning radon prevention.     

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。     

2008年日本火灾情况

<正>1火灾总数在2008年(1～12月),日本发生的火灾总数为52 394起,与2007年相比减少了2 188起(4.0%)。这相当于平均1天大约发生143起火灾,每10min发生一起火灾。火灾类别(见表1)。     

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.