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. 2013 May 6;13(5):5796-813.
doi: 10.3390/s130505796.

Wireless laser range finder system for vertical displacement monitoring of mega-trusses during construction

Hyo Seon Park  1 , Sewook Son, Se Woon Choi, Yousok Kim
Affiliations

Wireless laser range finder system for vertical displacement monitoring of mega-trusses during construction

Hyo Seon Park et al. Sensors (Basel). .

Abstract

As buildings become increasingly complex, construction monitoring using various sensors is urgently needed for both more systematic and accurate safety management and high-quality productivity in construction. In this study, a monitoring system that is composed of a laser displacement sensor (LDS) and a wireless sensor node was proposed and applied to an irregular building under construction. The subject building consists of large cross-sectional members, such as mega-columns, mega-trusses, and edge truss, which secured the large spaces. The mega-trusses and edge truss that support this large space are of the cantilever type. The vertical displacement occurring at the free end of these members was directly measured using an LDS. To validate the accuracy and reliability of the deflection data measured from the LDS, a total station was also employed as a sensor for comparison with the LDS. In addition, the numerical simulation result was compared with the deflection obtained from the LDS and total station. Based on these investigations, the proposed wireless displacement monitoring system was able to improve the construction quality by monitoring the real-time behavior of the structure, and the applicability of the proposed system to buildings under construction for the evaluation of structural safety was confirmed.

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Figures

Figure 1.
Figure 1.
Data transmission process for the LDS.
Figure 2.
Figure 2.
Principle of the LDS.
Figure 3.
Figure 3.
Target structure, D building. (a) Three-dimensional view of the main elements. (b) Cross-sectional plan of the main elements.
Figure 4.
Figure 4.
Mega-truss A.
Figure 5.
Figure 5.
Edge truss.
Figure 6.
Figure 6.
Removal schedule for temporary bents.
Figure 7.
Figure 7.
Installation location. (a) Laser sensor 1. (b) Laser sensors 2 and 3.
Figure 8.
Figure 8.
Triangle module installed at the measured point: (a) point 1, (b) point 2, and (c) point 3.
Figure 9.
Figure 9.
Measurement method of the total station.
Figure 10.
Figure 10.
Total station measurement: (a) total station and (b) prism.
Figure 11.
Figure 11.
Prism: (a) point 1 mark, (b) point 2 mark, and (c) point 3 mark.
Figure 12.
Figure 12.
Calculated displacement of building: (a) before and (b) after bent removal.
Figure 13.
Figure 13.
Variations of deflection during bent removal: (a) point 1, (b) point 2 and (c) point 3.
Figure 14.
Figure 14.
Variations in the measured value according to the rotation of the triangle module.
Figure 15.
Figure 15.
Change in horizontal distance due to rotation around each axis.
Figure 16.
Figure 16.
Measured deflection on April 25: (a) point 1, (b) point 2, and (c) point 3.
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