The pylon of the Xinshougang Bridge, a welded steel box arch with a variable cross-section, exhibits asymmetrical design and unevenly inclined limb ends. The segmented assembly of this uniquely shaped steel pylon necessitates precise splicing. In this paper, a novel three-point method for segment attitude positioning is proposed based on the local coordinate system. This method facilitates accurate coordinate translation and attitude alignment between the section preparation facility and the construction site. Furthermore, a predictive methodology for segment posture during erection is introduced, aiming to minimize misalignments at the connection interfaces. This approach accounts for potential deviations arising in manufacturing and erection phases. The synergistic application of these methods effectively ensures the precise geometric shape of the bending and twisting steel tower throughout its phased construction.

中文翻译：

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异形结构节段拼装三维测量与快速定位技术研究

新首港大桥桥塔为变截面焊接钢箱拱，呈现不对称设计和不均匀倾斜的肢端。这种形状独特的钢塔的分段组装需要精确的拼接。本文提出了一种基于局部坐标系的三点分段姿态定位方法。该方法有利于分段准备设施和施工现场之间的精确坐标转换和姿态对准。此外，还引入了安装过程中节段姿势的预测方法，旨在最大限度地减少连接接口处的不对中。这种方法考虑了制造和安装阶段出现的潜在偏差。这些方法的协同应用，有效保证了弯扭钢塔在整个分期施工过程中几何形状的精确性。