Advances and prospects in dynamic 3D trajectory measurement technology for curved pipe jacking

Abstract:

Curved pipe jacking requires the pipeline to advance with high accuracy along a three-dimensional designed alignment， and trajectory control is critical to both breakthrough quality and construction safety. Traditional guidance systems for pipe jacking are designed primarily for near-straight drives， and therefore cannot adequately meet the attitude and heading control requirements of complex three-dimensional curved drives. Gyroscope-based guidance is a promising approach to this problem， but the dynamic accuracy can degrade in complex construction environments and its long-term stability is difficult to maintain. Targeting the needs of dynamic three-dimensional trajectory measurement for space-curved pipe jacking， this paper reviews commonly used guidance and measurement techniques including manual visual sighting， laser-target methods， prism-based optical tracking， total-station surveying， and gyro-based guidance， while clarifing their applicability and limitations. Among these， gyro-based guidance is the preferred solution for long-distance curved drives. Therefore， this paper identifies the major issues encountered in engineering practice and proposes corresponding remedies and avenues for improvement. This work aims to inform further research and application of dynamic 3D trajectory measurement technologies for space-curved pipe jacking.