燃气管道三维空间定向穿越施工监测

It is of great significance for municipal pipeline engineering construction to implement 3-D horizontal directional drilling (HDD). In virtue of a practical project, this work carries out the onsite monitoring of a gas pipeline during 3-D HDD construction. Based on gyroscope position-detection system and fiber optic sensing technique, an integrated scheme for the pipeline construction monitoring is designed and conducted. The 3-D spatial coordinates of the overall pipeline are measured. The strain responses and hence the axial forces and moments of the test section traveling through the whole drilling track are obtained. It testifies that the longitudinal strains and the section moments are sharply increased as the test pipe traverses with a rotation simultaneously in the horizontal and vertical planes. The recorded data is informative for the further theoretical analysis and the monitoring strategy can provide a reference for the similar projects.