斜置式插入钢管基础施工的定位测量与控制

Position Measurement and Control for Inclining Foundation Construction with Inserted Steel Pipe

220kV舟山与大陆联网工程2基370m高塔均位于海岛,为满足基础受力要求,采用了斜置式插入钢管基础。斜置式插入钢管基础具有大根开、深基坑、基坑不等深配置、大体积混凝土、基础斜置式、插入钢管结构等特点,但定位尺寸精确测量难以控制。通过建立相对坐标系,准确计算基础各部位的三维坐标,并采用AutoCAD软件绘制立体模拟图核实;采用坐标定位法,用电子全站仪进行现场的精确测量与定位,实现了斜置式插入钢管基础施工的高精度定位控制。

The two 370 m extra high towers are located on island, which belong to the 220 kV Zhoushan-Mainland connection project. In order to meet the requirements of the foundation force, the inclining foundation with inserted steel pipe was adopted. The foundation had many characteristics, such as large leg distance, deep foundation pit with varied depth, mass concrete, inclining foundation chimney, inserted steel pipe, and so on. Thus, it had the control problem of accurate measurement for the location dimension. Based on the relative coordinates, this paper accurately calculated the 3D coordinates for every part of the foundation, which was verified by the 3D drawing of AutoCAD. High precision positioning control was realized for the inclining foundation construction with inserted steel pipe, based on the accurate on-site measurement and position by electronic total station with coordinate positioning method.