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介绍了关家沟特大桥工程概况,分析了桥墩轴线的放样施工,提出了施工中消除温度影响的控制技术,并进行了理论计算,对该技术的现场应用情况进行了探讨,得出了该方法正确的结论,为同类工程积累了经验. 相似文献
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介绍了<预应力混凝土用金属波纹管>JG225-2007修订的背景,同时对修订内容作了较详细的介绍.本次修订主要增加了波纹管的品种,提高了质量标准,完善了有关规定,简化了有关检验. 相似文献
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《中国建筑金属结构》2010,(12):23-30
时间过得很快,一年一度的年会现在又开始了。去年10月27日我参加了在安徽黄山召开的年会.那次年会我做了一个报告,讲了模板脚手架行业的基本状况.提出了模板脚手架行业在当前社会进步和经济发展中的重要地位和作用,也讲了模板脚手架行业的技术创新状况,同时着重讲了一下模板脚手架行业的经营方式。这个讲话已经印发给了大家。 相似文献
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简述了常用无卤低烟电缆的特点,研究了建筑用无卤低烟环保防潮型布电线的技术关键和主要性能指标,编制了产品的企业标准,探讨了产品的技术与生产现状,试制了样品线,检测了样品性能,通过了投产鉴定,综合性能达到国内先进水平。 相似文献
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根据积石峡水电站实际施工条件及地质条件,对原围堰体型进行了优化设计,减少了场内交通布置,对原围堰基础防渗形式进行了优化设计,提高了围堰防渗能力,为主体工程施工创造了良好的施工条件,节省了工期,从而保证了积石峡水电站顺利发电。 相似文献
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对墙体开裂的因素进行了分析,从墙体开裂产生及如何处理等方面进行了论述,提出了预防和处理的方法,进行了墙体开裂常见原因研究,达到了防治墙体开裂的效果,解决了建筑物安全使用问题。 相似文献
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针对堆土加卸载与基坑开挖叠加效应导致既有地铁隧道变形较大的问题,建立考虑加卸载叠加效应影响的三维空间分析模型,研究不同堆土加卸载叠加基坑开挖卸载模式对邻近地铁隧道变形规律的影响,探讨隧道在堆土加载、移土卸载再叠加基坑开挖下的变形规律。结果表明:正上方堆土加卸载对隧道的竖向位移影响较大,是侧向堆土加卸载的3倍~5倍; 在经历堆土加卸载后,隧道会残留不可忽视的变形,其残留竖向位移约为加载后位移的62%; 堆土加卸载叠加侧方基坑开挖时,隧道变形受基坑开挖深度的影响较大,大于隧道埋深的开挖阶段会加剧隧道变形; 4种叠加模式中,正上方堆土加卸载-侧方基坑开挖卸载隧道最终竖向位移最大,约17 mm,侧方堆土加卸载-异侧基坑开挖卸载隧道最终水平位移最大,约8 mm,邻近隧道施工时应充分考虑叠加效应的影响,尽量避免这两种情况。 相似文献
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为改进钢筋骨架质量自动检查方法,提出了基于点云的钢筋骨架中钢筋数量和钢筋间距的自动检查算法。该算法在获取钢筋骨架实际点云和设计点云的基础上,首先对这两片点云分别进行降采样,以得到空间密集程度相同的钢筋骨架实际点云和设计点云; 其次,对降采样后的钢筋骨架实际点云和设计点云使用基于主成分分析(PCA)的方法进行粗配准。由于粗配准后的钢筋骨架实际点云和设计点云的配准精度较低,无法直接用于钢筋数量和钢筋间距的检查,对粗配准后的钢筋骨架实际点云和设计点云进行精配准。最后,基于精配准得到的钢筋骨架实际点云和设计点云,依次对钢筋骨架中的钢筋数量和钢筋间距进行检查。结果表明:精配准后的钢筋骨架实际点云和设计点云的配准精度较高,可以用于钢筋数量和钢筋间距的检查; 该算法对钢筋数量检查的准确率为100%,对钢筋间距检查的准确率为80%; 应用该算法可以有效提高复杂钢筋骨架中钢筋数量和钢筋间距检查的效率,降低人工成本。 相似文献
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Harald Budelmann Alexander Holst Hans‐Joachim Wichmann 《Beton- und Stahlbetonbau》2009,104(6):330-339
Magnetoelastic Measurement of Prestressing Force in Civil Structures The knowledge of the tensile force of prestressing steel elements and its reliable and non‐destructive determination are of essential importance for the assessment of the structural health condition of prestressed concrete structures and tie‐back systems in terms of structural safety, serviceability and durability. For the evaluation of the prestressing force in steel tension members, the measurement technique presented in this contribution is using the magneto‐elastic effect (ME‐effect) of ferromagnetic materials. This effect describes the reverse‐proportional correlation between the mechanical stress and the magnetic properties of ferromagnetic materials. The cylindrical coiled sensors pushed over the tendon and the measuring device developed and practically optimized at the iBMB/MPA of the TU Braunschweig enable a fast and reliable measurement of the prestressing steel force after an initial calibration. In this contribution first the state of the art of prestress measurement techniques for steel tension members is presented. Afterwards, the ME‐measuring method with the basics and merits of magneto‐elastic prestressing force identification is shown. Further recent research results as well as several building applications will be discussed. 相似文献
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秦淑玲 《建筑科学与工程学报》1993,(2)
建筑是一部人类文明史,建筑装饰艺术是其中最精美的语言,它记载着科学技术的发展和文化艺术的进步,它描绘出风土人情与时代风尚。本文主要论述了建筑外形式装饰艺术的涵义及设计要点,对建筑装饰艺术的形态构成、造型与装饰、装饰的视觉效应以及建筑外形式装饰艺术的个性和设计中应注意处理好的关系进行了讨论。 相似文献
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为增强装配式建筑产业链供应链自主可控力,保障装配式建筑产业链供应链安全稳定,采用文献梳理与实际调研结合法,贯穿全生命周期时空链,阐释装配式建筑产业企业链、供应链与价值链内涵及相互关系,进而构建装配式建筑产业链供应链自主可控力评价体系,采用COWA-DEMATEL法分析其自主可控力影响因素的综合中心度及其原因、结果效用,并从科技自主性、组织安全性与产业脆弱性3个方面提出了改善建议。结果表明:装配式建筑企业链属结构单元层面,价值链属结构目标层面,供应链属结构运行层面,三者存在相互作用、相互依存关系; 核心技术水平、外部环境波动、信息可控能力、合作协同程度、组织应急能力对装配式建筑产业链供应链自主可控力提升具有重要影响作用; 外部环境波动、资金自主水平、人员综合素质为影响装配式建筑产业链供应链自主可控力水平的主要原因因素,而产品安全水平为影响装配式建筑产业链供应链自主可控力水平的主要结果因素。 相似文献
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The paper considers methods of procurement for the construction of water- and sewage-treatment works other than the traditional use of the ICE 5th Edition Conditions of Contract and Bills of Quantities. This is as a consequence of the speed at which schemes are currently required within the water industry.
The paper particularly focuses on the use of target contracts, using the Institution of Chemical Engineers'Green Book form, and considers various types of target. It also discusses the form which tender documents may take, and how targets may be calculated.
Tendering procedures, including the use of two-stage tenders and negotiated targets, are considered, as are the procedures for cost monitoring and the financial management of the contract. Finally, the role of the engineer and quantity surveyor is considered. 相似文献
The paper particularly focuses on the use of target contracts, using the Institution of Chemical Engineers'Green Book form, and considers various types of target. It also discusses the form which tender documents may take, and how targets may be calculated.
Tendering procedures, including the use of two-stage tenders and negotiated targets, are considered, as are the procedures for cost monitoring and the financial management of the contract. Finally, the role of the engineer and quantity surveyor is considered. 相似文献
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John Aitchison 《Landscape Research》1996,21(1):89-97
This paper considers the nature and significance of town and village greens within the landscape of England and Wales. It reflects on problems of definition and on the limited availability of data concerning the origins and geographical distribution of greens. The paper draws attention to the registration of greens following the Commons Registration Act 1965, and summarizes information collated from the registers subsequently prepared by local authorities. Details of numbers of greens and their spatial density at county level are presented, and reference is also made to rights of common on greens, and to the ownership of the greens themselves. 相似文献
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为了查明成兰铁路沿线茂县曲谷沟小学后山崩塌地质灾害的类型、结构形态、规模、变形特征及成因机制,对该崩塌地质灾害开展了工程地质应急勘查工作,采用地面测绘、探井、原位测试等多种勘查手段,查明该崩塌、教学楼的不稳定斜坡(陡坎)成因、类型、规模、范围、稳定状态及危害性,并分析其变形机制,表明:崩塌危岩体规模级别属中型,危害对象等级为一级,勘查地质条件类型为复杂,该灾害体治理工程等级为Ⅰ级。得到的结果可为进一步的评估防治工程提供参考。 相似文献