高压旋喷止水帷幕在近海深厚杂填土层中的应用

本文根据对高压喷射注浆止水帷幕在厦门某城基坑止水施工中的应用,分析了高压旋喷止水帷幕在近海深厚杂填土层基坑止水施工中的可行性。经过基坑开挖施工及位移观测,止水效果明显,可应用于近海深厚杂填土层基坑止水施工,并对类似地质条件下的基坑止水施工具有指导意义．     

在轨道交通换乘通道施工中应用MJS工法桩加固

上海轨交13号线金沙江路站与轨交3、4号线换乘通道位于宁夏路凯旋北路口,其基坑平面形状为不规则的“7”字形.综合各方面考虑,基坑止水及坑底加固采用了MJS工法,止水搭接700 mm,坑底搭接500 mm,止水采用180°半圆截面,搭接采用全圆满堂加固方式.该工法取得了预期效果,为以后大面积基坑止水、加固施工积累了经验.     

某深基坑止水帷幕失效后的渗漏治理

深基坑止水帷幕是控制地下水涌入的重要措施之一,止水帷幕是否有效,直接关系到整个基坑工程的安全,一旦止水帷幕出现大规模的渗漏涌漏而失效,势必影响到基坑体系的安全及危害到基坑周边建筑物、地下管线、道路等市政设施.针对某工程一级深基坑止水帷幕失效后,所进行有针对性的基坑综合治理措施的理论与实践研究,采用坑外注浆封堵、坑内挂网喷浆封堵、坑外深井降压等治理措施.基坑监测表明,基坑再未出现渗漏现象,治理效果良好.     

混凝土咬合桩止水围护体系在基坑支护中的应用

随着城市地下空间的广泛开发利用,为提高基坑工程止水围护体系施工质量及进度,采用混凝土咬合桩止水围护体系.介绍混凝土咬合桩止水围护体系的构造及施工工艺,分析对比三轴搅拌桩止水帷幕对基坑施工质量、进度和效益,该止水围护体系的应用效果良好.     

锚索孔堵漏方法在桩锚支护工程中的应用

深基坑常常采用桩锚的基坑支护体系进行基坑支护,该支护体系适用于复杂地质条件,并在经济性和安全性方面都有一定优势.但是在采取封闭止水帷幕的基坑施工时,锚索施工会穿透止水帷幕,对止水帷幕造成一定破坏.结合在施项目工程实际,对锚索孔堵漏方法在桩锚支护工程中的应用进行了阐述,并就其综合效益进行了分析比对.     

基坑止水帷幕深度对临近双线隧道影响数值分析

基坑开挖过程中通常需设置止水帷幕来隔断基坑内外水力联系,以保证基坑降水的顺利进行,然而止水帷幕的深度问题及不同止水帷幕下基坑开挖对邻近既有隧道其应力变形特性影响仍有待了解。基于深圳某基坑开挖工程,采用有限元软件PLAXIS,研究了不同止水帷幕深度下基坑开挖对临近双向水平地铁隧道的应力及变形影响。结果表明:在不同止水帷幕下,基坑外水位下降高度随着帷幕深度的增加而不断减小;不同帷幕深度下基坑邻近隧道变形及内力变化较小;基于本工程1.33倍的基坑开挖深度是比较合适的止水帷幕深度。     

长螺旋旋喷搅拌水泥土帷幕桩技术在工程中的应用

基坑工程中,对地下水处理的方法应用比较广泛的有许多种,止水帷幕就是其中之一.本文介绍了止水帷幕常用的施工方法及其优缺点,重点介绍了长螺旋旋喷搅拌水泥土帷幕技术在基坑工程中的应用情况,该技术很好地解决了目前在类似北京地区较硬土层中施工帷幕造价高、施工质量可控性差、止水效果不理想等问题,为类似需要做止水帷幕的基坑工程提供了...     

某深基坑工程止水帷幕透水渗漏的防治

深基坑止水帷幕透水渗漏是基坑开挖过程中经常出现的质量问题,对深基坑的边坡安全危害极大.笔者介绍了青岛市某医院扩建工程在深基坑支护施工中出现止水帷幕透水渗漏质量问题的处理过程,通过此案例分析了在深厚砂层中帷幕渗漏的原因,提出了类似基坑止水帷幕渗漏的处理方法及预防措施.     

注浆止水在六盘水市电信大楼基坑工程中的应用

由于基坑开挖中的大量抽取地下水容易引起周围建筑物的不均匀沉降,注浆止水是解决此类问题的有效途径之一.六盘水市地质条件复杂,地层中的沙砾层厚度大,透水性强,下覆基岩岩溶、裂隙发育,基岩裂隙水与上部土层中的地下水连通,给基坑工程止水增加了许多难度.本文介绍六盘水市电信大楼两层地下室的基坑开挖搅拌及注浆止水实例,供本地区后继相关工程参考.     

临江深基坑止水帷幕施工技术

随着基坑工程的规模和开挖深度的不断加大,止水帷幕的施工质量对基坑后续施工安全至关重要.本文以具体工程实例,阐述了深基坑止水帷幕施工技术.结果表明,所采用的施工技术是可行的,可供类似工程参考.     

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.     

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。     

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。     

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.     

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.