大面积地下室混凝土结构无缝跳仓法施工技术

跳仓法是施工缝法的发展与创新,工程地下室混凝土结构采用"跳仓法"施工技术,能够有效解决后浇带的问题,只需设置短暂的施工缝,不掺加任何的膨胀剂和抗裂纤维,即可解决地下室超长、超宽和超大面积混凝土施工的难题,有效避免了大面积地下室结构因温度收缩应力而产生裂缝、渗水的问题。文章就跳仓法施工技术在大面积地下室混凝土结构中的应用展开研究,以期为类似工程提供有效的参考依据。     

跳仓法施工技术的研究与应用

结合工程实例,通过取消原地下室后浇带,优选原材料、合理进行砼配合比设计,采用跳仓法技术进行施工的成功做法。跳仓法是解决地下室超长结构施工难题的一种新的行之有效的方法,可供同类工程参考。     

首部《超长大体积混凝土结构跳仓法技术规程》地方标准通过评审

<正>由北京市质量技术监督局、北京市住建委联合组织专家评审组,对北京市建工研究院会同相关勘察、设计、施工等单位编制的《超长大体积混凝土结构跳仓法技术规程》进行了评审,获得顺利通过,并得到与会专家的高度评价。该规程是国内第1部针对超长大体积混凝土结构采用跳仓法进行设计和施工的技术规定。其原理是在普通跳仓法基础上,用施工缝取代施工后浇带和永久性变形缝,能够有效减少地下室结构工程的混凝土开裂,提高其防水性能。该规程     

“跳仓法”在海峡国际社区C地块地下室工程中的应用

海峡国际社区C地块（34～35#楼）超长、超宽、超厚的地下室工程由原设置后浇带改为跳仓法施工的技术措施，既确保施工质量，又缩短了施工工期及成本。本文对跳仓法施工在该工程的应用做了详细的阐述。     

跳仓法在“安厦·世纪城揽翠湾”地下车库结构中的应用

介绍了跳仓法混凝土施工技术在“安厦·世纪城揽翠湾地下车库”结构中的施工应用。通过专家组对各施工方案的充分论证,确定采用跳仓法进行施工。对跳仓法在地下超长混凝土结构中的应用进行了详细的探讨。     

跳仓法在超大面积混凝土工程施工中的应用

介绍了跳仓法施工技术在超长、超大面积结构混凝土施工中的应用。实践表明:跳仓法既可以提高建筑物抗裂性,又可以实现超长混凝土结构连续作业,从而解决了后浇带封闭前对后续施工工序的影响问题,为工期计划的按时实施提供了保证。     

某超长地下室混凝土结构裂缝控制设计

本文结合工程实例,采用PMSAP有限元分析某商业综合体超长地下室结构在温差效应下对结构的不利影响,在此基础上相应采取设置后浇带、混凝土配合比优化、混凝土浇筑跳仓法施工、温度应力较大的地方采取提高配筋率、钢筋细密化布置等措施来解决超长地下室裂缝问题。     

某工程地下室底板大体积混凝土跳仓法施工技术

综合考虑后浇带施工方法存在的问题以及跳仓法施工优点,广州世纪云顶雅苑工程地下室超长、超宽底板大体积混凝土采用跳仓法施工技术.指出跳仓法施工的注意事项:仓块宜小不宜大;仓间混凝土浇筑时间间隔宜长不宜短;水泥用量宜少不宜多;混凝土养护宜早不宜迟等.同时给出了混凝土配合比、温度控制措施以及施工缝做法,成功解决了大体积底板因混凝土收缩应力及水泥水化热作用而出现的裂缝问题,也解决了大方量混凝土连续浇筑施工的技术问题.     

跳仓法施工技术在超长无缝混凝土结构中的应用

工程地下混凝土结构采用"跳仓法"施工技术,施工时不留设任何形式的后浇带和伸缩缝,只设置暂时的施工缝,成功地解决了地下室超长、超宽混凝土结构施工难题。     

地下混凝土结构跳仓法施工控制要点

为解决地下超长混凝土结构后浇带设置带来的一系列工程难题，跳仓法的施工技术在实践中已有较多的应用。这种施工方法具有便于施工、节约成本、加快施工进度的优点。结合工程实践，对“跳仓法”施工的技术特点、工作原理、施工过程及控制要点进行了论述与总结。在北京某工程跳仓法施工的工程实践中，通过正确地进行仓位划分、控制混凝土浇筑顺序、对分仓缝节点部位重点把控、优化混凝土原材料配比、严格执行混凝土浇筑和养护等措施，有效控制了地下结构的有害裂缝，减少了地下室渗漏水的隐患，并缩短了工期。     

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.     

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。     

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.     

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.     

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。     

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。     

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。     

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。