共查询到20条相似文献,搜索用时 218 毫秒
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单层大跨度、大起重、重级工作制钢结构厂房柱脚锚栓预埋施工,精度要求高,定位允许偏差为5mm,标高允许偏差为0.00~+30mm,其锚栓直径大,自重重,在施工过程中必须做好锚栓预埋施工过程各工序的质量控制。采用专用的定位钢模板和角钢将柱脚锚栓组装起来形成一个整体,使一个承台内的锚栓定位不会在混凝土浇筑过程中产生偏移。同时在混凝土浇筑过程中采用正确的振捣方式和全站仪跟踪监测,保证柱脚锚栓的预埋精度,提高安装速度。 相似文献
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《中国建筑金属结构》2015,(12)
本文介绍了超高层建筑施工过程中,钢结构柱脚锚栓预埋施工要求精度高,因基础底板极厚,钢筋排布紧密,同时锚栓数量多、本身自重大,故在锚栓深化设计、施工阶段必须做好锚栓预埋施工时各工序的质量控制。采用定位环板及支架控制同一锚栓组的相对位置,通过预埋板对支架进行定位控制其绝对位置,从而达到控制锚栓安装精度的目的。 相似文献
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青岛北客站站房屋盖钢结构通过10对复杂巨型钢骨与混凝土基础连接,巨型钢骨是基础与钢屋盖连接的唯一部位。复杂巨型钢骨结构异形,与上部屋盖结构对接口数量众多,而且与混凝土基础结构、预应力管道交叉施工,安装精度很难控制。主要从复杂巨型钢骨构件验收、锚栓预埋、吊装、焊接、测量等施工工序对巨型钢骨安装进行阐述,合理规划巨型钢骨安装过程中与土建钢筋绑扎、混凝土浇筑及预应力管道安装的穿插施工顺序,严格监控各个施工过程,保证巨型钢骨安装精度,为混凝土结构巨型钢骨埋件的安装提供宝贵的施工经验。 相似文献
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Andreas Unterweger Panagiotis Spyridis Ronald Mihala Konrad Bergmeister 《Beton- und Stahlbetonbau》2008,103(11):741-747
Shear Loaded Quadruple Fastenings Close to edge – Experimental and Numerical Analysis Fastenings in concrete with anchor groups placed close to a free edge are often met in practice. At the connection of anchors with a steel base plate, installation tolerances are present and so the anchors are randomly placed in the clearance holes of the plate. Consequently, by shear loading of an anchorage, the individual anchors are not activated simultaneously and the group's shear capacity is strongly affected. At shear loaded quadruple anchorages close to an edge the most unfavourable configuration is reached if the first row of anchors is loaded first. Based on that, the current design of shear loaded anchor groups close to an edge according to ETAG 001 considers only the anchors near the edge for ultimate limit state (ULS). In experiments with common geometries and unfavourable anchor configurations in contrary essential higher ultimate loads are shown. To provide a basis, the influence of a single anchor on the ambient concrete surface is investigated by non‐contact Electronic Speckle Pattern Interferometry (ESPI). It enables to show the three dimensional deformation of the concrete surface in the range of micrometers, to detect micro cracks at their initiation and to measure their width. Supported by finite element simulations the influence of the most unfavourable anchor configuration on the internal flow of forces is analysed. 相似文献
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Panagiotis Spyridis Andreas Unterweger Ronald Mihala Konrad Bergmeister 《Beton- und Stahlbetonbau》2008,103(9):617-624
Behavior of Anchor Groups Close to an Edge under Shear Loads – Stochastic Studies Fastenings in concrete with anchor groups placed close to a free edge are often met in practice. At the connection of anchors with a steel baseplate, installation tolerances are often present and the anchors are randomly placed in the clearance holes of the plate. Consequently, by shear loading of an anchorage, the anchors are not activated simultaneously and the group's shear capacity is strongly affected. By means of more precise investigations on this feature, improved design concepts will be developed. In the present article a stochastic analysis of the group's behavior under shear loads is described, where random configurations of the anchors in the clearance holes but also various geometries and mechanical parameters of a group are taken into consideration. Based on the results of this analysis an equation is finally proposed, in order to calculate the shear capacity of an anchor group where installation tolerances are involved in relation to its geometric and mechanical properties. 相似文献
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钢骨混凝土转换层施工涉及钢结构安装、模板搭设、钢筋及混凝土浇筑等步骤,与常规转换层施工有一定差异。是转换层施工中的关键工序。本文结合某项目的转换梁施工,介绍了钢骨转换粱施工中的关键技术,包括转换梁模板支撑设计、安装,混凝土浇注、钢筋绑扎等关键工序的施工。实践证明本文采有的方法是安全可行的。 相似文献
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大模内置聚苯板钢塑复合插接栓外墙外保温系统由聚苯保温板、水泥抗裂砂浆防护层和饰面层组成。主要施工工序包括:钢筋绑扎、聚苯板安装、塞入钢塑复合插接栓、模板安装、浇筑混凝土、模板拆除、铺压热镀锌钢板网、抹水泥抗裂砂浆和粘贴面砖。大模内置聚苯板钢塑复合插接栓外墙外保温系统具有安全、可靠、耐久和较经济的优点,有广泛应用的前景。 相似文献
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介绍了在公路桥梁工程中预应力混凝土I型梁预制时对模板的制作、钢筋骨架的安装、混凝土浇筑、张拉及灌浆过程中采取的一些技术措施,解决了梁端齿块破损、侧向弯曲、起拱值偏大、张拉伸长值难以控制及孔道堵塞等一些质量问题,并取得了较好的效果。 相似文献
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某工程劲性混凝土框架施工技术 总被引:1,自引:1,他引:0
针对黄河女儿雕塑工程报告厅独特的施工特点,详细阐述了施工工艺流程,模板支架搭设采取的措施,钢骨架制作及吊装时的注意事项以及混凝土浇筑段的划分及浇筑路线.施工中采取的相应技术措施,有效解决了劲性钢骨架安装、坡屋面混凝土浇筑和水平推力平衡问题.施工效果良好. 相似文献
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介绍重庆民族广场民族大厦钢管混凝土柱结构特点、施工工艺和质量要求。包括钢管柱制作、组焊、安装,补偿收缩混凝土施工、坍落度调整、高位抛落并振捣的方法浇筑钢管混凝土及钢管混凝土柱的质量检查方法。 相似文献