Surveying and digital workflow in energy performance retrofit projects using prefabricated elements

Larsen, Knut Einar; Lattke, Frank; Ott, Stephan; Winter, Stefan

doi:10.1016/j.autcon.2011.04.001

Cited by 69 publications

(48 citation statements)

References 4 publications

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“…This is partially due to the reliance on Revit and the orthogonal design constraints that this encourages, meaning that representing unusual deviations that exist in as-built documentation have to be accounted for in this way; unless very time consuming (and therefore expensive) bespoke modelling is performed. This experience is borne out by literature where the tedium of modelling unique components [11] and the unsuitability of current BIM software to represent irregular geometry such as walls out of plumb [15] are recognised. However Plowman Craven, as outlined in their specification above, do make use of the availability of rich semantic detail to add quality information about deviations from the point cloud to the modelled elements.…”

Section: Standards For Modellingmentioning

confidence: 99%

Automatic Geometry Generation from Point Clouds for BIM

2015

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Abstract:The need for better 3D documentation of the built environment has come to the fore in recent years, led primarily by city modelling at the large scale and Building Information Modelling (BIM) at the smaller scale. Automation is seen as desirable as it removes the time-consuming and therefore costly amount of human intervention in the process of model generation. BIM is the focus of this paper as not only is there a commercial need, as will be shown by the number of commercial solutions, but also wide research interest due to the aspiration of automated 3D models from both Geomatics and Computer Science communities. The aim is to go beyond the current labour-intensive tracing of the point cloud to an automated process that produces geometry that is both open and more verifiable. This work investigates what can be achieved today with automation through both literature review and by proposing a novel point cloud processing process. We present an automated workflow for the generation of BIM data from 3D point clouds.We also present quality indicators for reconstructed geometry elements and a framework in which to assess the quality of the reconstructed geometry against a reference.

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Section: Standards For Modellingmentioning

confidence: 99%

Automatic Geometry Generation from Point Clouds for BIM

2015

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“…The hoist can be fixed or can be moved along a rail. The Gondolas [7] are used mainly for maintenance and cleaning purposes. Other lean works such as façade painting can be also undertaken with this system.…”

Section: Hanging Systemsmentioning

confidence: 99%

Comparison of Automated and Robotic Support Bodies for Building Facade Upgrading

Iturralde¹,

Linner²,

Böck³

2015

Proceedings of the International Symposium on Automation and Robotics in Construction (IAARC)

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The need for ameliorating the physical properties of existing buildings' envelopes is growing. For that purpose, a widely used solution is to add new layers on the external face. Each layer performs a function; insulation, moisture barrier or finishing. Energy harvesting devices can be installed on too. Each of these layers don't need to be assembled on site separately, there are already experiences with the installation of prefab components on the external face of existing façades. Those components can be accurately customized and adjusted to the geometrical irregularities of the existing building wall. Though, the installation of these prefab components is primarily based on manual tools and techniques. A robotic installing performance would facilitate the fixation of these new components on the exterior of the building. This means that the robotic tools must reach every point of the building's façade with enough stability and accuracy. Therefore, a proper support system (also known as robot body) is needed. Those supporting bodies should host different automated tools for installing the component. Before creating a structure or body from scratch, different existing support systems have been analyzed. First, there are the traditional support systems, where the operator works using manual tools. Second, robots and automated mechanisms that work on the exterior of the building have been studied. And third, technology in other fields has been taken into account. After the results of the virtual simulation have been gathered, those are compared with the data of traditional or manual installation methods. Thus, we can see if the solution is competitive enough in terms of cost and time. Besides, it is remarked the adequacy of each body type to work in different building typologies and it is also pointed out the suitability of each support body type for installing different façade components and materials. Finally, as a conclusion, the article defines possible future research.

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“…As such, workflows promote the process-oriented modeling of activities. In recent years, workflows have been implemented for a wide range of applications from formalized data processing activities for extracting bridge components from 3D laser point clouds (Tang & Akinci, 2011) to a workflow-driven approach for the energy performance retrofitting of existing buildings (Larsen, Lattke, Ott, & Winter, 2011).…”

Section: Workflow Driven Designmentioning

confidence: 99%