江坪河水电站深基坑抽排水抢险施工技术

2010年江坪河水电站“7.10”特大暴雨,致使基坑积水深达40m,抽水量约400万m3,工程受灾十分严重.根据抢险安排,抽排水工期初定为20d,故抽排水平均强度为20万m3/d.深基坑采用大功率水泵串联抽排水技术,投入60多台套水泵进行基坑强排,顺利完成了抗洪抢险任务.     

江坪河水电站坝区冲沟综合治理分析及对策

江坪河水电站坝区内两岸山坡存在多处冲沟,汇水面积大,影响后期基坑开挖和大坝填筑。结合两岸冲沟现状及水文气象资料,对冲沟治理进行综合分析,通过设置截水挡墙、截水池、排水洞及排水渠等多种方式对两岸冲沟进行综合治理,确保了施工安全和工期,取得了良好的社会效益和经济效益。     

采用微型桩+预应力锚索+混凝土冠梁的基坑加深技术

北京大兴国际机场中南指廊基坑施工中,针对原址1号废水泵基底标高调整,开挖深度由15.25 m变为19.75 m。原支护设计不能满足要求的情况,采用微型桩+预应力锚索+混凝土冠梁的基坑加深技术,保证了基坑边坡稳定。     

深基坑管井降水施工水泵损坏率降低策略分析

深基坑管井降水施工时往往出现水泵损坏,水泵损坏率高不仅影响基坑支护的安全性能,还导致重大经济损失,延误建设工期。本文就深基坑管井降水施工水泵损坏率降低策略进行阐述。     

超深基坑开挖(井点降水、钢板桩围堰及高压射水泵送吸砂)综合运用施工技术

在超深基坑施工过程中常遇到的堵水难、抗渗难、支护难、开挖难、封底难及局部坍塌造成基坑底隆起等诸多困难,因此在特定的地理环境和施工条件下对超深基坑施工过程中井点降水技术、钢板桩围堰支护技术与高压射水泵送吸砂开挖技术的综合运用的总结和分析是十分必要的。     

浅谈基础降排水工程施工技术

结合具体工程，从降排水施工组织、排水沟及井点设置、基坑内外降排水总量抽水设备计算、水泵功率计算等方面介绍了基坑内外降排水工程施工方案，此方案排水效果好，并受外界降雨的影响小，对加快和保证施工工期具有积极意义。     

深厚卵石地层超深基坑降水论证分析

针对深厚卵石地层超深基坑降水问题,以北京某超深基坑开放式降水工程为依托,开展抽水和降水试验,采用数值模拟方法论证分析了开放式施工降水方案。得出结论如下:场地已完成的降水井由于未能实现闭合围降,不能满足干槽作业要求,场地满足干槽作业,降水井布设的最低要求为井间距6m,且单井出水量≥43m~3/h。对于形状不规则基坑,相比大井法,采用数值模拟定水位法计算开放式降水基坑涌水量更为合理,稳定基坑涌水量约为14万m~3/h。降水井数量和位置一定的条件下,在地下水位降至安全水位前适当选择大功率水泵抽水,可缩短工期,减少地下水开采总量。     

莲花台水电站基坑大面积排水施工技术

对于修建水电站来说,基坑排水是一项重要的工作,如何快速有效地降低基坑水位,给下一步施工提交干地作业工作面,从而加快施工进度并缩短工期,是每个水电站工程应该研究的问题.对莲花台水电站基坑排水施工技术进行了研究,探索了水泵的技术改造和独创的多泵排水方案,有效地解决了基坑渗水、涌水难题,保证了施工正常进行.     

用混凝土振动器改制成软轴潜水泵

建筑工地基础施工中,一到雨季在基坑和基槽中常常积满雨水,给施工带来了一定的困难。排除这些积水,通常采用作业面潜水泵或其他水泵。这些水泵一般移动不方便,维修也比较麻烦。而且一旦缺少这些设备,就只得由人工用戽斗汲水。     

高层建筑基坑支护施工对周边建筑的影响及工艺优化研究

基坑支护施工是高层建筑施工中的重要内容,但高层建筑基坑支护施工易对周边建筑造成影响,因此在实际施工中应重点关注该问题。该文首先对高层建筑基坑支护施工的施工特点、施工技术类型、施工要求等进行了简介,其次以某高层建筑工程为例,分析了该工程施工场地自然条件情况和基坑支护施工设计情况、探讨了该工程基坑支护施工对周边建筑的影响、提出了该工程基坑支护施工工艺优化措施。     

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.     

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.     

谈城市历史保护规划的误区

由于缺乏起码的历史文化知识,忽视历史文化遗产的保护,错误的决策导致了建设性的破坏,要加强城市保护的教育,培养合格人才。