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Henk Freimuth, Jan Müller and Markus König

Planning UAV-Assisted Visual Inspections of Construction Sites

Abstract: Inspection flights on construction sites, carried out with Unmanned Aerial Systems (UASs), should be planned with safety as the primary priority. Although the generation of waypoints may be conducted in an automated fashion, with distance-to-object constraints implemented in the algorithm, the visual review of such flight paths by a human operator before take-off is crucial. Apart from safety concerns, finding the right camera orientation for taking photographs of specific details is a non-trivial task when the camera is mounted to an Unmanned Aerial Vehicle (UAV). The inspection planning application should interactively assist the operator with this task.We propose an interactive and simulation-based inspection flight planning concept. A realistic and detailed simulation allows a quick and intuitive insight about generated flight paths and possible shortcomings of such paths in terms of flight safety. Images, rendered from the virtual scene, with the flying cameraĠs point of view enable the operator to assess the quality of the intended photographs before conducting the flight mission. These previews take into account the main parameters of the camera such as focal length and natural lighting. This minimises the need to readjust parameters or repeat inspection flights to get the right picture.

Keywords: Visual Inspection, Unmanned Aerial Systems, 4D Building Information Modeling, Progress Monitoring, Ground Control, Path Planning

DOI: https://doi.org/10.24928/JC3-2017/0150

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Series: jc3:2017 (browse)
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R Lundkvist,J Meiling

Towards an Experience Feedback system from Building Inspections through Classification of Construction Works

Abstract: Different studies on the construction industry have shown that new buildings are produced with a large number of defects. The common practice in the industry to deal with defects is in a reactive way, i.e. to wait for the final inspection, rectify and then move on to the next project. There are competitive incentives for companies to learn from mistakes, i.e. through Experience Feedback, although the peculiarities of project-based organizations make these activities difficult. These difficulties might frighten companies from investing in new and complex feedback activities. We suggest that the information about defects from Final Inspections could be a way towards Experience Feedback, when the inspections are mandatory and therefore already entrenched in the industry. Taking this as a starting-point, this paper aims at evaluating the generation of defects information from final inspections of a large conference centre project and to present and discuss the results through the lens of Classification and System theory. The paper will show what kind of information that can be drawn from a current de facto ‘best practice’ of Final Inspection report in Sweden. It is suggested that the quality of defects information can be enhanced by classification of data with a suitable object classification system for construction work, such as the Swedish BSAB system. Eventually, the horizon of future research is discussed.

Keywords: Project Knowledge Management, Experience Feedback, Building Inspections, Classification system

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Full text: content.pdf (319,576 bytes) (available to registered users only)

Series: w78:2011 (browse)
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Robert Lundkvist, Anders Vennstrom

Requirements of an Inter-Project Digital Inspection System

Abstract: Characteristics of the construction industry are mobility, project orientation and the set-up of new organization in every project. The products are one-of-a-kind and seldom develop beyond the prototype phase. This is often suggested as reasons for the the low development of productivity in the construction industry, and continuous improvement and experience feedback becomes harder to accomplish from project to project. The production results are handed over from contractor to client through different inspections. The inspector creates a "punch list" with all found faults, for the contractor to correct before the construction work can be finally accepted. These often lengthy lists on documented faults are full of information that can be useful for the contractor company’s learning and experience feedback process. A previous study shows that contractors acknowledge this potential use, but they need some sort of IT system to support the inter-project management of the inspection information collected.The aim of this paper is to analyze what type of information is valuable in an inter-project inspection information system (IPSIIS), to enhance learning and feedback in construction contractor companies. Interviews have been carried out with experienced inspectors and construction engineers, and a “best practice” for building inspections in Sweden is described. The requirements of a digital IPSIIS are analyzed, both from a regulatory point of view and from the perspective of making the inspection data useful for knowledge mining. Based on best practice, a strategic approach for the design of the user interface is presented for the successful acceptance in the industry. Some principals for codification are also discussed.

Keywords: experience feedback, information technology, inspection, quality

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Series: w78:2010 (browse)
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Xiaonan Zhang, Nick Bakis, Song Wu, Mike Kagioglou, Ghassan Aouad, Tim Lukins, Yahaya Ibrahim

Incorporating the progress measurement dimension to an integrated building information system: a research framework

Abstract: The accurate measurement of work in progress on construction sites is important for calculating interim payments as well as for business and project management functions like schedule and cost control. Currently it still takes place using traditional building surveying techniques and visual inspections. However the usually monthly meas-urements are not frequent and accurate enough, incorporating judgement and shortcuts. An EPSRC funded collaborative research is looking at supporting the measurement of work in progress on construction sites using computer vision technology within the context of an integrated building information system. In particular, the research aims to develop a system that automatically measures the progress of construction from digital images captured on site, analyses the progress against the original schedule in order to identify any potential delays and calcu-lates interim payments. The paper presents the initial findings from the research and a development framework for the proposed system.

Keywords: progress measurement, integrated building information system, computer vision

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Series: w78:2007 (browse)
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