后张预应力混凝土施工技术在高层建筑中的应用

1 工程概况 某高层住宅楼地上26层,底下2层,为现浇框架剪力墙结构,总建筑面积为77 635m2,使用功能为商场、公寓.根据它的使用功能及结构设计要求,基础底板采用了后张无粘结预应力技术,首层顶板至12层顶板部分框架梁采用了后张有粘结预应力技术.     

有粘结无粘结双向预应力在混凝土框架中的应用

在三层三跨预应力混凝土框架中，主梁采用后张有粘结部分预应力，次梁采用无粘结部分预应力。本文主要介绍主次梁双向预应力的施工工艺。     

剧院现浇框架后张预应力大梁设计

后张预应力大梁现浇钢筋混凝土框架结构,具有受力性能好,梁的高度小,既有利于建筑物的使用空间,又有利于减轻结构自重、节省用料。 本文介绍了这种结构型式应用于体操练习馆和剧场建筑等工程的情况。并以民族歌舞团排演厅的两层后张预应力大梁框架为例,较详细地说明了后张预应力大梁现浇框架结构的计算步骤和方法。     

多层多跨后张预应力框架梁施工

介绍在某多层多跨工业厂房中部分采用后张预应力混凝土框架装配结构的施工工艺、测试以及施工注意事项。     

有粘结无粘结双向预应力在混凝土框架中的应用

在三层三跨预应力混凝土框架中．主梁采用后张有粘结部分预应力．次梁采用无粘结部分预应力．主要介绍主次梁双向预应力的施工工艺和测试结果分析。     

超长后张拉有粘结预应力柱施工技术

黄龙饭店改扩建工程8#楼裙房宴会厅位置柱(地下四层至地上三层)均采用后张拉有粘结预应力形式,柱内预应力钢绞线贯通地下四层至地上三层,全长33.35m,且张拉需一次完成,给施工带来较大困难。本文结合实例重点论述了超长后张拉有粘结预应力柱在施工中的难点以及关键施工技术。     

后张有粘结预应力结构施工质量控制例谈

洛阳师范学院新图书馆位于学院中区中心地带，框架五层，一期工程建筑面积29080m^2，单层屋面长102.65米，宽75.25米，最大跨度为23m。针对该工程主梁跨度大、荷载重及大型结构等特点．设计在屋面部分采用了后张有粘结预应力大梁。为有效抵抗超长结构的温度和收缩力，在屋面A-C轴和J-K轴间设计后张无粘结预应力混凝土板。实际应用中．采取了一系列具体的严格的质量控制措施，保证了预应力大梁的施工质量，达到了预期的效果。下面结合该工程谈谈后张有粘结预应力结构施工质量控制的一些问题。     

现浇预应力框架与叠合楼板工程的施工

发展预应力混凝土结构与工艺,是为了使现代的多层工业与民用建筑具有空间大、布置灵活,并具有良好的抗震性能,同时为了改革现浇结构的楼面模板,我们提出了一种后张预应力框架与预应力叠合楼板相结合的现浇框架结构体系,选择某机电楼工程进行试点。该工程的主体结构已于1982年12月建成,现将其施工情况介绍如下。     

二次预应力组合梁框架体系研究

基于二次预应力梁的特点,将二次预应力组合梁引入民用建筑的大跨度框架体系中。总结了二次预应力组合梁框架的设计要点,提出了二次预应力组合梁框架的构造要点和施工措施,同时进行了二次预应力组合梁和普通后张法预应力梁对比算例分析。最后得出二次预应力组合梁框架体系具有很大应用前景。     

大跨度预应力混凝土梁板施工实例

1 工程概况 雅戈尔集团国际服装城商务行销设计中心大楼,位于浙江省宁波市鄞县大道和雅源路交叉口。大楼地下1层,地上11层,总高度74.6m,总建筑面积35000m~2,采用全现浇框架-剪力墙结构体系,钻孔灌注桩筏板式基础。框架大梁采用后张法有粘结预应力混凝土体系,预应力框架主梁有单跨、多跨形式,跨度分别为20m和30m,断面分别为600mm×1200mm和800mm×1700mm。楼面多为连续式单向板,部分     

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。