Application of the Rebound Method and the 3D Laser Scanning Technology in the Health Detecting of Metro Line Structure
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摘要: 采用回弹法对某地铁线路新建基坑进行检测，利用钢筋检测仪探测钢筋的位置及间距，使用质量分数为1%酚酞酒精溶液和混凝土碳化深度尺测量混凝土表面的碳化深度，再用回弹仪测取混凝土表面的回弹值，根据平均回弹值及平均碳化深度可得出混凝土强度换算值，继而计算出混凝土强度推定值。通过现场检测，总结了回弹法检测混凝土强度精确度的影响因素以及提高检测精确度的措施。采用三维激光扫描技术结合人工方法对地铁线路结构平面、断面进行测量，再对其使用现状进行调查。检测及现状调查结果表明，该地铁线路结构车站、区间隧道混凝土强度符合原设计要求，地铁结构存在剥落、裂纹、渗水等病害，研究成果可为地铁结构健康评估提供参考及依据。Abstract: The rebound method is used to detect the metro line new foundation pit concrete structure, and the position and spacing of the rebar are detected by using the rebar detector. The carbonization depth of concrete surface was measured by 1% phenolphthalein alcohol solution and carbide depth gauge, and resilience instrument is used to measure the rebound value of concrete. The concrete strength conversion value is obtained based on the average rebound value and the average carbonization depth, then the concrete strength is calculated. Through on-site detect, the factors influencing the accuracy of concrete strength and the measures to improve the accuracy of the test are summarized. 3D laser scanning technology combined with the artificial method is used to measure the structure plane and section of the metro, and its use status is then investigated. The detect and current situation investigation results indicate that the concrete strength of metro structure station and interval tunnel conforms to the original design requirements, there are whereas peeling, cracking, seepage and other damages existing in the metro structure. The results can provide reference and basis for the health assessment of metro structure.
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Keywords:
- metro structure /
- rebound method /
- 3D laser scanning technology /
- concrete /
- health detecting
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