盾构隧道通用环管片拟合排版技术

Fitting Typesetting Technology of General Segmental Rings for Shield Tunnel

为实现通用环排版计算步骤和结果与管片实际偏差计算在隧道坐标下的统一,以准确、高效开展基于隧道轴线的管片轴线拟合,进而优化盾构通用环管片排版技术,首先明确了隧道三维坐标系的选取方法及盾构管片空间姿态的表示方法,提出了盾构通用环管片排版端面中心三维坐标的计算方法及起始环的定位方法。根据某盾构隧道工程实例,利用研发软件进行排版拟合,结果表明:该方法得到的排版结果与隧道设计轴线的拟合效果良好;将拟合得到的管片排版端面中心坐标与实际测量结果进行对比,能够得到施工偏差方向及具体数值,可为后续排版和纠偏提供定量控制指导,该研究成果还可实现管片楔形量的试算,从而优化管片设计参数,为盾构隧道的设计及建设提供技术支持。

In order to realize the unification of the calculation steps and results of the general ring typesetting and the actual deviation calculation of the segment under the tunnel coordinates,the fitting of the segment axis based on the tunnel axis can be carried out accurately and efficiently,and the typesetting technology of the general segmental ring for shield tunnel is optimized.Firstly,the selection of the three-dimensional coordinate system of the tunnel and the representation method of the space attitude of the shield segment are clarified.The calculation method of the true three-dimensional coordinates of the end face center of the typesetting of the general segmental ring for shield tunnel and the positioning method of the starting ring is proposed.According to an example of a shield tunnel project,the research and design software is used for typesetting and fitting.The results show that:The true three-dimensional coordinates of the end face center of the end face of general segmental ring for shield tunnel obtained by this method have a good fitting effect on the tunnel design axis.The center coordinates of the end face of the segment typesetting obtained by fitting can be compared with the actual measurement results,and the construction deviation direction and specific value can be obtained,which can provide quantitative control guidance for subsequent layout and deviation correction.In addition,the research can also realize the trial calculation of segment wedge,thus optimizing the segment design parameters,and providing technical support for the design and construction of shield tunnel,which has great application value.