海域深水区混凝土底板钢吊箱围堰施工技术

以广深沿江高速公路深圳段项目为依托,详细介绍了工程特点,分析了围堰的施工方案;对钢吊箱围堰结构进行了优化设计,包括钢吊箱壁板、混凝土底板、腰梁及悬吊系统、拼装平台,并进行了结构验算。另外,深入探讨了钢吊箱围堰拼装及下放,包括钢吊箱围堰拼装,悬吊下放与导向安装,钢吊箱围堰的定位系统,以及钢吊箱封堵及封底混凝土施工。结合工程实例,对海域深水区承台围堰施工技术进行了创新,较好地完成了施工任务。     

复杂海况可回收分块底板钢吊箱围堰施工技术

鉴于国内波浪大的复杂海况下高桩承台钢吊箱施工方法工效较低,钢吊箱底板无法回收,结合长平高速公路CPA3项目松下跨海特大桥海中高桩承台施工情况,提出了可完全回收的分块企口拼装型钢底板钢吊箱围堰施工技术,可实现底板钢结构全部回收周转使用,安拆便捷,且刚度大能抵抗波浪的冲击作用,安全可靠,节约大量施工成本、缩短工期.重点介绍...     

钢吊箱围堰设计中定位偏差的研究

钢吊箱围堰是为承台施工而设计的临时阻水结构,其作用是通过钢吊箱围堰的侧板和底板或底板上的封底混凝土围水而为承台施工提供无水的干体作业环境。大型吊箱围堰设计,围堰定位偏差或固定不牢,一旦出现问题后果将不堪设想。通过工程实例针对钢吊箱围堰设计中定位偏差问题展开研究。     

拼装式钢吊箱在深水桥梁基础施工中的应用

以浪溪河大桥水中墩为研究对象,研究制作了拼装式钢吊箱,解决了水中高桩承台(系梁)施工中吊箱底板无法拆除,并进行二次利用的问题,即通过采用新工艺和优化工序,使钢吊箱底板可反复拆卸利用,且无需采用潜水员作业,大大降低了施工风险,节省了施工成本。     

钢吊箱围堰结构设计与施工技术的思考

钢吊箱围堰是在承台施工的过程中临时设计建造的阻水结构,目的是通过钢吊箱围堰侧板和底板上的封底混凝土围水,为承台施工提供干燥无水的施工条件。本文以福州绕城公路东南段琅岐特大桥2号桥水中墩承台施工为例,对钢吊箱围堰的结构设计和施工技术进行深入的探索探究。     

海域深水区高桩承台钢吊箱围堰施工技术

唐山纳潮河2号大桥采用有底单壁钢吊箱施工水中高桩承台,对4种工况进行分析,利用软件建模得出各构件的最大应力,在钢吊箱拼装、下沉、封堵、浇筑封底及拆除中采取了针对性措施,保证了施工安全且效率较高。     

钢吊箱在大桥深水区承台施工中的应用

廖家沟大桥是扬州市文昌路东延工程中的重要节点性工程,是实现扬城"一体两翼"战略发展的重要基础。本文介绍钢吊箱技术在大桥施工中的应用,钢吊箱围堰是为承台施工的阻水结构,其作用是通过吊箱围堰侧板和底板上的封地混凝土围水,为承台施工提供无水的干燥环境。     

上海长江隧桥高桩承台围堰选型与设计

针对长江隧桥B1标浅滩区28座高桩承台,充分考虑长江口所处施工环境特点,对多种围堰方案进行了技术经济分析,选取了混凝土底板钢吊箱。该围堰由混凝土底板、钢吊箱壁板及内支撑、吊挂系统(下沉系统)等组成,壁板和底板是围堰的主要阻水结构并兼作承台模板,具有施工周期短、周转材料投入少和施工风险低的特点。根据最不利工况,确定了底篮、吊挂系统和封底混凝土;采用三维有限元方法,对吊箱结构的受力和变形进行了模拟分析,分析结果表明各构件应力和变形均在允许范围内。     

混凝土预制底板钢吊箱水中桥墩承台施工技术

通过上海崇明越江通道长江大桥B1标工程水中墩施工事例,详细叙述了采用混凝土预制底板钢吊箱施工桥梁水中墩承台的设计计算和施工方法。     

某钢吊箱施工过程有限元分析

钢吊箱围堰是高桩承台施工的最重要的施工阶段之一,为了确保其安全性,需对钢吊箱施工过程的力学性能进行全面分析.根据崇启长江大桥主墩钢吊箱的施工工艺过程,首先分析了钢吊箱施工过程需要考虑的各种计算工况,然后通过ANSYS软件建立对应的有限元模型,对钢吊箱在各种施工工况下的力学}生能进行了分析,给出了在各工况下钢吊箱的受力特性.分析表明:钢吊箱整体设计合理,在各个施工工况,整体应力水平较低,结构安全可靠,抽水工况为最不利工况.该分析结果对以后钢吊箱设计与施工具有指导意义.     

污泥制砖存在问题浅析

污泥制砖符合国家的环保政策,但在技术方面还待进一步创新和突破。为此分析了污泥制砖在技术方面、环保方面和社会大众认可方面存在问题及相应的改进措施。     

干旱区绿洲环境下的新疆小城镇建设投资

一、研究区域基本现状新疆地处欧亚大陆腹地,地貌轮廓表现为“三山夹两盆”,山地与平原的面积大致各占50%,镶嵌于戈壁沙漠的绿洲仅有7万平方公里。新疆土地面积166.49万平方公里,占全国总面积的六分之一。气候干旱,荒漠广布,是中国最大的干旱区,是亚洲干旱核心区,也是世界上著名的干旱区之一。水资源短缺,生态极度脆弱。新疆2004年底有1950万人,人均GDP已经超过了1000美元,城镇化进入了快速发展阶段,特别是小城镇的发展速度较快。但新疆特殊的干旱区绿洲环境,使得小城镇的发展存在许多问题。一是城镇规模小而散,基础设施配套差,城镇集散和…     

Levels of manganese in the urine of female farmers in non-polluted regions in Japan

Nearly 1500 urine samples were collected from female farmers in eight regions widely scattered in the islands of Japan in the winter of 1987-1988. The samples were analysed for manganese by wet ashing and flameless atomic absorption spectrophotometry under strict quality control. The values observed after adjustment for a specific gravity of 1.016 were distributed log-normally with a geometric mean of 0.65 microgram/l and a geometric standard deviation of 2.47. There was no effect of aging or any effect of smoking on the urinary manganese concentration. The inter-regional difference may be present but not yet conclusive. As no sex difference was observed in a previous study, it may be possible to deduce that the value may possibly stand for the "background" level of both men and women, either smoking or non-smoking, among the general Japanese population. The observed value is discussed in comparison with values reported in the literature.     

Typification of Fires in Buildings in Spain

Although the Dirección de General de Protección Civil (DGPC), an agency of the Spanish government, has been responsible for the collection of data and the statistical analysis of fires since 1985, it has not as yet issued any reports. It is true that a couple of studies have been made, but in neither case did they use a standardized methodology but relied simply on the heterogeneous information provided by the fire brigades which cooperated in the studies. At that time Spanish fire brigades did not have special units for professional fire investigation, nor was the information derived from standardized methodologies suited to research purposes. In addition, information was extremely scarce and basic, focussed only on the fire, the use of the building and personal data of the victims. In this context, the project for a Fire Investigation Unit in the Fire Brigade of Málaga (the sixth largest Spanish province in inhabitants) was set up. Although inspired in the methodologies used in the USA and in the UK, the aim was to create a customized methodology for the first scientific investigation of fires in Spain. Our research was conducted in 2007. Using the methodologies of the USA and the UK, our own methodological approach and the Spanish regulations, we drew up a questionnaire with 110 variables arranged into 6 modules. We studied 96 fires out of the 154 emergency fire calls received in 2007, having omitted some emergency calls for various reasons. Our results revealed that it was necessary to generalize the installation of fire extinguishers in residential buildings, to train the general public in the use of these devices, to promote the use of fire and smoke detectors in residential buildings, to encourage the inspection and control of old electric installations and to monitor the new installations, to generalize the implementation of emergency and evacuation plans and to design new systems and materials for the cabinets where hand-held extinguishers are stored.     

分光光度法测水中余氯

介绍了用双硫腙分光光度法测定水中余氯的新方法，阐述了其测定试验过程，根据试验结果显示，其结论符合国家标准，表明该方法可用于自来水等样品中余氯含量的测定，结果比较准确。     

Intersections of inequality in homeownership in Sweden

Abstract

Inequalities relating to ownership of housing have become a major issue de jour in many Western societies. This article examines how the distribution of homeownership in Sweden relates to two factors widely seen as significant to such inequalities, namely parental tenure status and place of birth. We use longitudinal registry data to examine the bearing of these two factors on individual-level tenure progression since the beginning of the 1990s for persons at different stages of their housing careers. We extend existing understandings of Swedish homeownership patterns by demonstrating that inequalities relating to place of birth and parental tenure intersect with one another in ways that substantially advantage certain subgroups while disadvantaging others, and by demonstrating that experiences of entry into homeownership have in recent years been changing in markedly different ways for these different subgroups. Overall, Swedish homeownership inequalities, far from dissipating, appear to be hardening along existing lines.     

莳花在城市绿化中的应用

目的:花化、香化、彩化已成为城市园林绿化的主要趋势,也是为满足人们对环境要求越来越高的一种心境。方法:选择采用莳花能表现出品种繁多,色彩艳丽等不同的方式,从而能在很大程度上丰富了植物造景的层次感要求。结果:能使其达到美化环境、增添节日气氛、提高绿化品质等方面有着突出的作用。结论:莳花造景对城市的美化可达到立杆见影效果,从而提高城市的形象和品位。     

日本城市浅层地下空间利用的新成就

本文结合日本川崎市站前广场和神户市哈巴兰德地区的立体化再开发，分析介绍当前日本浅层地下空间开发利用的成就和特点。     

遗传算法在边坡稳定系数计算中的应用

边坡稳定性的关键问题是确定最危险滑动面(潜在最危险滑动面)和边坡的稳定系数。国内外一般是采用先假定边坡滑移模式,然后近似确定最危险滑动面,再求近似的边坡稳定系数的方法来分析边坡的稳定性,但假设的边坡滑移模式难以反映边坡滑移的实际状态。因此本文探索利用遗传算法搜索最危险滑动面,并得到最小稳定系数及对应的最危险滑动面曲线,取得了较好的效果。     

地质情况复杂地区高速公路隧道地质预报研究

针对地质情况复杂地区垫邻高速公路设计、施工中的具体问题，从地质预报的方法、原理方面入手，对地质情况复杂地区高速公路隧道施工中的地质超前预报工作进行了深入的研究，在分析归纳的基础上，提出合适的工作方法。