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Chen A,Golparvar-Fard M,Kleiner B

SAVES: a safety training augmented virtuality environment for construction hazard recognition and severity identification

Abstract: One of the most challenging aspects of health and safety (H&S) management for construction sites is ensuring that workers can predict, identify, and respond to potential hazardous conditions before they are exposed. While OSHA addresses the need for enforcement of comprehensive H&S training programs, many safety training programs still do not include hazard recognition or systematic preparations for the avoidance of unsafe conditions. From a scientific standpoint, we currently lack the knowledge of discovering the most efficient training styles for safety and also understanding why and how these styles of training can influence the post-training activities. To address these needs, an Augmented Virtuality(AV) training environment named System for Augmented Virtuality Environment Safety (SAVES) was designed and is presented in this paper. SAVES which integrates a Building Information Model (BIM) with photographs of typical energy sources on a jobsite, allows trainees to control and navigate an avatar within such AV environment. Within the AV environment, the user can conduct a set of interactions with the environment and accomplish multiple instruction and task-based training scenarios. These scenarios include detection of ten types of hazard and/or energy sources at three levels of severity. The energy sources which in SAVES are embedded in forms of 3D elements and 2D imagery are designed to elevate the safety awareness of the users, enable them to predict and identify various types of hazards, and assess their level of severity. To fully document the experience of the users, during each exercise, trainees’ choices, time for decision-making and corresponding prevention plan are documented in the system. The complete process of design, development, implementation and results analysis of SAVES is presented.

Keywords: Safety,Training,Virtual Reality,Hazard Recognition

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Full text: content.pdf (1,048,469 bytes) (available to registered users only)

Series: convr:2013 (browse)
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Claudio Mourgues, Martin Fischer, David Hudgens

Using 3D and 4D models to improve jobsite communication – virtual huddles case study

Abstract: This paper explores the unique challenges and opportunities of communicating design and construction information at the jobsite and describes the format and content of an information delivery method that we call Virtual Huddles (VDC-aided morning jobsite meetings). The research method used is direct participation in a test case (the construction of the concrete structure for a multi-family housing project) using VDC methods on a daily basis for approximately 4 months to support more than 40 daily morning meetings with the contractor’s field workers and staff. From the case observations and a structured interview, we observed that huddles are more effective when the content focuses on specific work instead of generic training or safety talks. However, it is not effective to deliver a high level of detail since workers will quickly forget it and come back later for specific dimensions. We also found that, on a daily basis, 3D models work better than 4D models. Some of the most important impacts of the huddles are a change in the structure of information distribution that empowers the laborers, a higher engagement of the laborers with the project, and an improvement in the communication between the contractor’s site management staff and the laborers.

Keywords: VDC (virtual design and construction), jobsite, contractor, communication, case study

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Full text: content.pdf (543,644 bytes) (available to registered users only)

Series: w78:2007 (browse)
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Han K,Gwak J-Y,Golparvar-Fard M,Saidi K,Cheok G,Franaszek M,Lipman R

Vision-based field inspection of concrete reinforcing bars

Abstract: Concrete reinforcing bars should be accurately placed in the positions shown on the construction drawings, adequately tied and supported before concrete is placed. These elements should be further secured against displacements within the tolerances recommended by project specifications. Ensuring compliance with contract documents and the building code applicable to the project under construction requires photographic documentation and close visual examination by field inspectors. Although inspection procedures are repetitive for every jobsite, the manual inspection methods are time-consuming and non-systematic. Moreover, the current practice of field inspectors walking into rebar cages and footings for close assessments can be a potential safety hazard on jobsites and can damage the integrity of the structure. To minimize the challenges of the current practice, this paper proposes a computer vision-based method for field inspection. In the proposed method, a field inspector can carefully walk around a rebar cage and take a complete collection of images from the underlying structure. Using a vision-based 3D reconstruction pipeline of Structure-from-Motion and Multi-view Stereo algorithms, a dense 3D point cloud model will be generated. Using an algorithm that maps and generates a density histogram of points, the locations and configuration of the rebars are identified. Finally, the spacings between rebars are calculated for field inspection. Experimental results on data collection, analysis, and visualization components of the proposed rebar inspection method is presented. These results show the promise of applying this low-cost approach in practice.

Keywords: Rebar mapping,field inspection,vision-based 3D reconstruction,concrete placement

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Full text: content.pdf (2,283,278 bytes) (available to registered users only)

Series: convr:2013 (browse)
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M K Siddiqui

Taxonomy of Work Spaces for Sensor-Driven Jobsite Management

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Full text: content.pdf (490,281 bytes) (available to registered users only)

Series: w78:2014 (browse)
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M Scheffer, T Rahm, M König

Simulation-Based Analysis of Surface Jobsite Logistics in Mechanized Tunneling

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Full text: content.pdf (354,973 bytes) (available to registered users only)

Series: w78:2014 (browse)
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Sunaga N, Nakamura H, Okazawa T

Project management system for small-medium building construction project

Abstract: "Recently there are few big building construction projects in Japan, and it is accordingly a very important matter for general contractors how to get more efficiency in small-medium scale projects. The target of IT tool developments for construction project management has been shifted gradually form big projects to small-medium projects. Targeting at the project management of small-medium scale building construction, This paper describes the objectives, a methodology of IT-enabled process innovation. From an IT viewpoint, this paper discusses the following present states of small-medium construction projects in Japan; the problems that project managers are facing, and the characteristics of construction process. And this paper presents two case studies at construction sites to investigate the applicability of IT to construction processes. In the first case study, implementation of IT tools in construction processes is promoted. IT tools refer to the followings; several in-house management software, graphic software, 3D-CAD, e-mail, www, digital camera, web-camera, wireless LAN and so on. From this try, the methodology of categorization of project information is considered. The author himself worked as one of project managers in this construction project, consequently he had two roles both as a development staff and as a user of IT tools. So some empirical approach is included in this consideration. In the second case study, focusing on logistics, an Extranet is constructed among a general contactor and sub-contractors in order to share project data (ex. drawings or schedule .etc), to check on work progress with jobsite web-cameras from remote offices, to adjust schedules of incoming building materials. Through this experiment, possibility of IT-enabled process innovation is explored. In conclusion, this paper proposes a methodology of IT-enabled process innovation that derived from above studies, and describes the concept and the system composition of an Extranet saver for project management based on it."

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Full text: content.pdf (339,579 bytes) (available to registered users only)

Series: w78:2000 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.synthesis (0.053357) class.collaboration (0.018265) class.economic (0.005766)
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Permission to reproduce these documents have been graciously provided by Icelandic Building Research Institute. The assistance of the editor, Mr. Gudni Gudnason, is gratefully appreciated


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