Underwater photogrammetry positioning of immersed tunnel element interfacing

doi:10.11947/j.AGCS.2024.20240030

Abstract

Abstract:

Using a measurement tower to convert underwater positioning to above-water positioning is the main method for positioning submarine tunnel segments at home and abroad. However, the coupled effects of measurement tower deformation and segment deformation affect positioning accuracy and are unable to adapt to deep-water docking. This article proposes an underwater active light encoding cooperative target photogrammetry segment docking positioning method, which uses active light to increase the optical distance, suppress backscattering, and encode the target to overcome the influence of suspended particles and plankton. Combined transmission light separation imaging and refractive index as unknown parameter measurement adjustment, overcoming the influence of water body turbidity and refractive index induced optical distortion on underwater photogrammetry. A photogrammetry system is installed on the top of the approaching segment's docking end, and a cooperative target is installed at the corresponding position of the already-submerged segment to ensure measurement and determine its position and attitude in the construction coordinate system. The position of the approaching segment in the construction coordinate system is obtained through rear intersection calculation, and the positional and attitude adjustment information of the segment is generated by comparing it with the theoretical position it needs to be sunk to, which assists in docking. The application of this method in the Deep Channel and Dalian Bay Submarine Tunnel projects shows that the segment docking linear accuracy reaches 2 cm and 100 m, providing key technical support for the construction of submarine tunnels under deep-water conditions in the future.

Key words: underwater engineering measurement, immersed tunnel, immersed tunnel positioning, under water photogrammetry, illumination cooperative target

CLC Number:

P258

Lin TIAN, Qingquan LI, Huachuan MA, Biao XUE, Minglei GUAN, Dejin ZHANG. Underwater photogrammetry positioning of immersed tunnel element interfacing[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(9): 1671-1678.

Figures/Tables 9

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测量差值	坐标值	前进100 mm			前进200 mm			前进500 mm
测量差值	坐标值	101	102	103	201	202	203	301	302	303
水上测量差值/mm	ΔX	－0.9	－1.2	1.3	－1.4	－1.9	1.1	－2.0	－2.1	2.9
	ΔY	－1.7	－1.2	0.6	－2.2	－2.1	0.4	－2.2	－2.1	0.7
	ΔZ	－2.0	－2.4	2.3	－2.8	－3.0	2.3	－2.7	－2.8	2.8
水下测量差值/mm	ΔX	－0.8	－1.4	－1.0	1.3	－0.4	－0.2	2.7	0.6	0.2
	ΔY	－3.4	－3.9	－4.6	－3.4	－4.0	－4.3	－3.3	－3.8	－4.2
	ΔZ	－2.6	－2.2	－2.0	－4.6	－4.3	－4.5	－4.7	－4.1	－4.0

位置	左侧相机	右侧相机	测量塔定位	贯通测量
纵向	—	—	5	8
横向	0.301	0.494	7	3
垂直	1.169	1.264	—	—