基于双线激光基准的盾尾间隙测量方法研究

针对现有众多盾尾间隙自动测量方法中普遍存在的精度低和可靠性差等问题，提出了一种基于双线激光基准标尺的视觉测量新方法。通过两道平行布设的窄线形激光构建观测基准，利用传统图像处理技术捕获盾壳与管片的关键特征，结合标尺反算误差补偿技术，实现在盾构掘进过程中盾尾间隙测量值的高精度实时解算。现场实验表明，本文所提出的方法的重复性测量精度优于1.2 mm,绝对测量精度优于2 mm,测量误差小于1.5 mm,该方法可以实现盾尾间隙自动化实时精确测量且具备较高的可靠性，现已应用在我国多个地铁隧道施工现场。

Research on the measurement method of shield tail clearance based on double line laser datum

To address the problems of low accuracy and poor reliability in many existing automatic measurement methods of shield tail clearance, a new visual measurement method based on double line laser reference ruler is proposed inthis article. The observation datum is constructed by two parallel narrow linear lasers, and the key features of shield shell and segment are captured by traditional image processing technology. Combined with the ruler back calculation error compensation technology, the high-precision real-time calculation of the measured value of shield tail clearance during shield tunneling is realized. Field experiments show that the repeatability measurement accuracy of the proposed method is better than 1.2 mm, the absolute measurement accuracy is better than 2 mm, and the measurement error is less than 1.5 mm. This method can realize the automatic real-time accurate measurement of shield tail clearance and has high reliability. It has been applied inmany subway tunnel construction sites in China.