南通市东快速路高架桥工程关键施工技术研究
发布时间：2018-12-16 14:38
【摘要】：随着城市建设的发展,高架桥对交通的疏导优势越来越明显,各大城市都在新建高架桥梁,高架桥梁施工过程中遇到的问题也越来越多。本文主要针对江苏省南通市东快速路高架桥工程建设过程中的线型测量控制、深孔灌注桩施工、混凝土(承台、墩柱、箱梁)浇筑质量控制和预应力钢绞线施工中的关键性问题进行研究探讨,提出解决方法和措施。线形测量控制方面,主要研究桩基放样方法及计算、承台、墩柱的放样方法,为避免偏压而进行的支座放样控制及上部箱梁施工放样控制中曲线段的放样。深孔桩施工,由于桩基所处100米范围内地层多为粉细砂层,属于不良工程地质情况,所以要研究各层的地质情况,并据此选择成孔钻机,还要注意泥浆的控制及导管的选择,确保施工质量。在高架桥混凝土的浇筑方面,分别对高架桥下部结构、箱梁等研究了浇注时的质量控制问题及箱梁支架模板方案,尤其是对箱梁满堂支架和门洞式支架进行了详细设计和计算。针对现浇箱梁的预应力施工,从预应力孔道的成型、钢绞线穿束、钢绞线张拉伸长值的计算、张拉、孔道压浆等各个环节,分别总结出关键性技术和质量控制点,能够避免施工安全事故的发生。论文研究成果可为同类工程施工提供参考。
[Abstract]:With the development of urban construction, viaduct has more and more advantages to traffic, and many cities are building viaduct, and more problems are encountered in the process of viaduct construction. This paper mainly aims at the line measurement control in the construction process of East Expressway Viaduct in Nantong City, Jiangsu Province, the construction of deep hole cast-in-place pile, concrete (cap, pier column), The key problems in the construction of prestressed steel strands and quality control of box girders are studied and discussed, and the solving methods and measures are put forward. In the aspect of linear measurement and control, this paper mainly studies the lofting method and calculation of pile foundation, the lofting method of pile cap and pier column, the setting out control of support in order to avoid bias pressure and the lofting of curve section in construction lofting control of upper box girder. In the construction of deep hole piles, most of the strata within 100 meters of the pile foundation are silty sand layers, which are not good engineering geological conditions. Therefore, it is necessary to study the geological conditions of each layer, and select drilling rigs accordingly, and pay attention to the control of mud and the selection of ducts. Ensure construction quality. In the aspect of concrete pouring of viaduct, the quality control of the substructure and box girder of the viaduct and the formwork scheme of the box girder support are studied respectively, especially the design and calculation of the box girder full hall support and the portal support are carried out in detail. According to the prestress construction of cast-in-place box girder, the key technologies and quality control points are summed up from the forming of prestressed holes, the calculation of strands, the calculation of tensioning elongation of steel strands, the drawing of tensioning, the grouting of holes, etc. Can avoid construction safety accidents. The research results of this paper can provide reference for the construction of similar projects.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
本文编号：2382518
[Abstract]:With the development of urban construction, viaduct has more and more advantages to traffic, and many cities are building viaduct, and more problems are encountered in the process of viaduct construction. This paper mainly aims at the line measurement control in the construction process of East Expressway Viaduct in Nantong City, Jiangsu Province, the construction of deep hole cast-in-place pile, concrete (cap, pier column), The key problems in the construction of prestressed steel strands and quality control of box girders are studied and discussed, and the solving methods and measures are put forward. In the aspect of linear measurement and control, this paper mainly studies the lofting method and calculation of pile foundation, the lofting method of pile cap and pier column, the setting out control of support in order to avoid bias pressure and the lofting of curve section in construction lofting control of upper box girder. In the construction of deep hole piles, most of the strata within 100 meters of the pile foundation are silty sand layers, which are not good engineering geological conditions. Therefore, it is necessary to study the geological conditions of each layer, and select drilling rigs accordingly, and pay attention to the control of mud and the selection of ducts. Ensure construction quality. In the aspect of concrete pouring of viaduct, the quality control of the substructure and box girder of the viaduct and the formwork scheme of the box girder support are studied respectively, especially the design and calculation of the box girder full hall support and the portal support are carried out in detail. According to the prestress construction of cast-in-place box girder, the key technologies and quality control points are summed up from the forming of prestressed holes, the calculation of strands, the calculation of tensioning elongation of steel strands, the drawing of tensioning, the grouting of holes, etc. Can avoid construction safety accidents. The research results of this paper can provide reference for the construction of similar projects.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
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