As- built inventory of the office building with the use of terrestrial laser scanning

Przyborski, Marek; Tysiąc, Paweł

doi:10.1051/e3sconf/20182600011

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…The largest ranges up to a few kilometres can be obtained using the TOF rangefinder of a laser scanner (e.g., RIEGL VZ-6000 with a range up to 6 kilometres). Usually, TOF scanners are suitable for long-range measurements, such as topography and mining [55], glacier mapping [56], long range monitoring and archaeology but can also be successfully used for shorter-ranges (e.g., civil engineering) [57]. In contrast, usually TLS measurements based on phase technology can be performed faster (up to 2 million points/sec., for instance Faro FOCUSS 350 PLUS), more accurately, and with a shorter range than TOF scanners.…”

Section: Tof and Phase-shift Principle Distance Measurement In Tlsmentioning

confidence: 99%

Comparison of Time-of-Flight and Phase-Shift TLS Intensity Data for the Diagnostics Measurements of Buildings

Suchocki

2020

Materials

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In recent years, the terrestrial laser scanning system (TLS) has become one of the most popular remote and nondestructive testing (NDT) methods for diagnostic measurements of buildings and structures as well as for the assessment of architectural heritage. Apart from 3D coordinates, the power of a laser beam backscattered from the scanned object can be captured by TLS. The radiometric information of the point cloud, called “intensity”, can provide information about changes in the physio–chemical properties of the scanned surface. This intensity can be effectively used to detect defects in the surfaces of walls, such as cracks and cavities, moisture, biodeterioration (mosses and lichens) or weathered parts of the wall. Manufacturers of TLS mainly use two different principles for distance measurement, time-of-flight (TOF) and phase-shift (PS). The power of energy in both types of rangefinders might be absorbed or reflected in a slightly different way and provide more or less detailed radiometric point cloud information. The main aim of this investigation is to compare TOF and PS scanners in the context of using TLS intensity data for the diagnostics of buildings and other structures. The potential of TLS intensity data for detecting defects in building walls has been tested on multiple samples by two TOF (Riegl VZ400i, Leica ScanStation C10) and two PS (Z + F 5016 IMAGER, Faro Focus3D) scanners.

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Section: Tof and Phase-shift Principle Distance Measurement In Tlsmentioning

confidence: 99%

Comparison of Time-of-Flight and Phase-Shift TLS Intensity Data for the Diagnostics Measurements of Buildings

Suchocki

2020

Materials

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“…Terrestrial Laser Scanning (TLS) [ 35 ] is a non-invasive, non-contact technique that enables fast and, what is very important, precise acquisition of data on the geometry of measured objects in the form of coordinates of points x, y, z. 3D laser scanning is currently used in many practical engineering applications, including inventory [ 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ], inspection [ 44 , 45 ], verification of test results [ 29 ] and maintenance of buildings [ 46 ], particularly historical buildings (constituting the cultural heritage). Inventory can be carried out faster and more accurately than when using traditional solutions.…”

Section: Introductionmentioning

confidence: 99%

“…It can be assumed that the data are continuous, not point-based—as it is in the case of classical solutions. The accuracy of models created with the use of TLS may vary from a few millimetres [ 41 , 47 , 48 , 49 ] to even decimetres [ 50 ]. The accuracy of measurements depends on several factors, including the distance and angle between the scanner and objects being scanned as well as the type of scanned surface, particularly in the case of highly reflective, mirror surfaces [ 51 , 52 , 53 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of Deflections of Temporary Excavation Support Plates with the Use of 3D Modelling

Marek¹,

Wiesław

Szymczak-Graczyk

et al. 2022

Materials

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Almost every project is accompanied by earthworks, very often involving various types of excavation, and the work of people in the excavations. One of the most important tasks in earthworks is to ensure that the walls of the excavation are protected against sliding and that people working in and around the excavation are safe. Very often, in addition to criteria relating to safety and stability of the excavation, economic considerations are also an important criterion. This issue arises as early as the design stage and is related to the choice of construction and materials of which the shoring is to be made in such a way as to be able to withstand the pressure of the soil, ground loads resulting from stored excavated material and the operation of working machinery. Ongoing monitoring of the excavations and their reinforcement is also very important. The paper describes the unique results of experimental field tests, the purpose of which was to analyse the values of deflections of steel support plates of temporary excavation carried out on the object in 1:1 scale. The course of the experiment is presented for excavation support plates with a total depth of 6 m. Direct tests of the deflection arrow were carried out using two techniques, traditionally with a patch, and with laser scanning. Field tests were carried out for the designed situation without backfill load as well as for backfill load of 3.84, 15.36, 26.88 and 38.4 kN·m−2, respectively, for two measurement stages. Stage-I of the study consisted in collecting the results for soil in intact condition, whereas Stage-II collected results for loosened soil. The research experiment was supported by numerical calculations performed using the finite difference method in variational approach. The measured maximum deflections ranged from 14.40 to 16 mm, and the calculated values were 14.95 and 14.99 mm. The comparison of calculation results and tests proved to be very consistent. The analysis of the values of deflections showed that backfill load does not have a significant effect on the deflection of the lower plate, but it does affect the deflection of the first plate up to a depth of 1.2 m. Based on the obtained results, it is recommended to assume the limit (maximum) deflection arrow for support plates of temporary excavations at least as wgr= L/130, where L is the span of the plate. The calculation of deflection values was based on deflection values obtained experimentally and numerically for two steel variants: S235JR and S355JR. The wgr indicator of the maximum deflection arrow proposed by the authors is not stipulated by the industry standards, but it can be very helpful for the designing of excavation reinforcement.

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“…Let us revise the case of a building inventory with the use of a laser scanner. The building side walls will be reproduced in contrast to a roof [9]. In order to solve this problem, it is reasonable to use another measurement method to collect spatial information on the object (e.g., with the additional use of aerial photos from the aircraft or UAV (Unmanned Aerial Vehicle)) [10,11].…”

Section: Introductionmentioning

confidence: 99%

Combined Close Range Photogrammetry and Terrestrial Laser Scanning for Ship Hull Modelling

Burdziakowski

Tysiąc

2019

Geosciences

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The paper addresses the fields of combined close-range photogrammetry and terrestrial laser scanning in the light of ship modelling. The authors pointed out precision and measurement accuracy due to their possible complex application for ship hulls inventories. Due to prescribed vitality of every ship structure, it is crucial to prepare documentation to support the vessel processes. The presented methods are directed, combined photogrammetric techniques in ship hull inventory due to submarines. The class of photogrammetry techniques based on high quality photos are supposed to be relevant techniques of the inventories’ purpose. An innovative approach combines these methods with Terrestrial Laser Scanning. The process stages of data acquisition, post-processing, and result analysis are presented and discussed due to market requirements. Advantages and disadvantages of the applied methods are presented.

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As- built inventory of the office building with the use of terrestrial laser scanning

Cited by 8 publications

References 6 publications

Comparison of Time-of-Flight and Phase-Shift TLS Intensity Data for the Diagnostics Measurements of Buildings

Comparison of Time-of-Flight and Phase-Shift TLS Intensity Data for the Diagnostics Measurements of Buildings

Experimental Validation of Deflections of Temporary Excavation Support Plates with the Use of 3D Modelling

Combined Close Range Photogrammetry and Terrestrial Laser Scanning for Ship Hull Modelling

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