New application of ship-borne combined laser and bathymetric surveying technique in wharf reconstruction project

doi:10.13474/j.cnki.11-2246.2019.0055

Abstract

Abstract:

In the process of the demolition of the old pile of Haixing pier in Shenzhen Mawan port, to avoid the remaining pile collide with the on the new pile in the new construction of the wharf, it is necessary to make a precise position of the remaining pile. The position of the remaining pile can be accurately calculated by knowing the point location and the pile slope. In this paper, the ship-borne combined laser and bathymetric surveying technique is used to survey the point location and the pile slope of the remaining pile. We used the laser scanner and multi-beam system to measure the point cloud of the water diversion surface of the pile on the water and underwater, respectively. We used the absolute coordinates of the laser point cloud with high accuracy, the point cloud of the water surface of the underwater pile is jointed, and the high precision absolute position of the water surface of the pile is obtained. Then, according to the absolute position of the water surface and the size of the pile, the point and slope of the part below the mud surface of the piles are calculated accurately. Absolute accuracy of pile positioning is 10 cm, which is verified by the location of wharf characteristic points. Finally, the measurement results of the old piles are compared with the design results of the new pile. The results show that there is a collision between new and old piles in the berth 2#, and 10 new piles and old piles in the berth 4# with a horizontal interval of less than 10 cm, which may occur in the construction process.

Key words: multi-beam measurement, ship-borne combined laser and bathymetric surveying, wharf pile surveying

CLC Number:

P258

GUAN Minglei, CHEN Zhipeng, LI Qingquan, ZHU Jiasong. New application of ship-borne combined laser and bathymetric surveying technique in wharf reconstruction project[J]. 测绘通报, 2019, 0(2): 113-116.

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