# 桥梁施工中的质量控制与钢绞线张拉问题

Quality control of the bridge construction and the problem of the steel cutter tension

ABSTRACT
Along with the transportation infrastructure of our country developing swiftly, a lot of bridges were built around the country, quality control of the bridge, for a safe of the bridge, play a critical role in the bridge’s operation. And some common, unable to avoid quality problems of bridges, such as cracks, the hole in the bridge, often puzzled the engineering technicians. In order to strengthen the understanding of quality control in the process of bridge construction and avoid the greater damage of the bridge as far as possible, this paper analyzed and summarized the common problems to the quality control of the bridge construction, facilitating the design, construction, finding ways to achieve prevent this role. In the latter half, this paper introduces the issue about pre-tensioned wire tension mainly. The calculation of Steel 毕业论文http://www.lwfree.cn/  论文网http://www.lwfree.com/
affect the prefabrication to carry on normally directly. If the tensile stress is higher, it will create ultra-pulling and the component will be destroyed; if the tensile stress is smaller, it could not achieve the request of the pre-crown and can affect the component using normally .Therefore, the calculation of steel articulation line is a question which we should attach highly importance to.
Key word
Bridge construction; Cracks; Hole; Prestressed concrete；Pretensioning law; Steel articulation line

1 工程概况 2
2 桥梁施工现场常见的质量问题 3
2.1 裂缝 3
2.2 蜂窝 5
2.3 麻面 6
2.4 孔洞 7
2.5 露筋 8
3 先张法钢铰线张拉 9
3.1 钢铰线张拉计算原理 9
3.2 先张法施工工艺 10
3.4 张拉机械 12
3.5 钢铰线张拉控制应力，张拉力及张拉程序 12
3.6 预应力钢铰线伸长值计算 14
3.7 钢铰线张拉控制值 15
3.8 预应力钢铰线的放张 15
3.9 施工中的注意事项 15
4 结束语 16

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