Research of Non-excavation Positioning Technology of Girth Weld in Underground Ferromagnetic Pipeline
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摘要: 利用RD8000测绘管道路由,使用非接触式金属磁记忆检测仪在埋地铁磁管道正上方采集管段信号。通过Savitzky-Golay滤波器对数据进行滤波,发现当磁感应强度法向分量变化量梯度Kz过零点,且磁感应强度切向分量变化量梯度Ky出现极值时,可以判断该特征位置为环焊缝位置。通过对比磁信号图中相邻环焊缝的相对距离ΔL1与建设期管节长度ΔL2,可以匹配磁信号图中环焊缝所对应的建设期编号,且误差小于1 m。最终结合磁记忆检测仪采集的GPS信息,从而确定目标环焊缝地理位置。Abstract: Using the RD8000 to map pipeline routing, a non-contact metal magnetic memory detector is used to collect the tube segment signal directly above the buried ferromagnetic pipeline. The data is filtered through the Savitzky-Golay filter. It is found that when the magnetic induction normal component change gradient Kz crosses zero and the magnetic induction tangential component change gradient Ky has an extreme value, the feature position can be judged as the girth weld position. By comparing the relative distance ΔL1 of the adjacent ring welds in the magnetic signal diagram with the length ΔL2 of the construction period, the construction period number corresponding to the girth weld in the magnetic signal diagram can be matched. Finally, the GPS information collected by the magnetic memory tester is combined to determine the geographical position of the target ring weld.
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表 1 西二线轮吐支线管线基本信息
介质 设计压力/MPa 操作压力/MPa 规格/mm×mm 天然气 10 6.0~9.0 ∅1 016×14.6 表 2 部分原始数据
Bx1/μT By1/μT Bz1/μT Bx2/μT By2/μT Bz2/μT DQ/μT 里程/m -25.894 6 10.938 8 -49.024 6 -26.050 3 8.487 7 -45.266 8 0.621 9 0.54 -26.118 3 10.432 6 -48.990 6 -26.226 1 7.984 1 -45.268 3 0.620 9 0.54 -26.296 8 9.812 1 -48.996 -26.357 3 7.382 7 -45.306 7 0.619 8 0.54 -23.643 9 10.277 -49.964 4 -23.909 7 7.892 6 -46.201 2 0.575 9 1.37 -23.643 9 10.277 -49.964 4 -23.909 7 7.892 6 -46.201 2 0.575 9 1.37 -23.689 6 10.404 8 -49.914 1 -23.992 2 8.173 -46.097 5 0.575 7 1.37 -24.352 9 5.700 3 -49.953 6 -24.476 5 3.849 5 -46.319 3 0.533 5 2.26 表 3 特征焊缝位置
特征点编号 位置/m 相对距离ΔL1/m 1 8.2 - 2 19.3 11.1 3 30 10.7 4 42 12 表 4 特征焊缝与建设期资料对比
特征点位置 建设期资料 误差/m 特征点编号 位置/m 相对距离ΔL1/m 对应焊缝编号 相对距离ΔL2/m 1 8.2 - 176 330 - - 2 19.3 11.1 176 340 11.8 0.7 3 30 10.7 176 350 11 0.3 4 42 12 176 360 11.5 0.5 -
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