AR BIM Headset Registration for Precise Construction Layout
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Solution Overview
Problem
Conventional construction site setting out methods require frequent site engineer intervention, leading to delays, errors, and compounding of positioning discrepancies due to reliance on manual interpretation of drawings and validation processes, which are time-consuming and prone to inaccuracies.
Innovation Solution
A wearable augmented reality headset with integrated position-tracking sensors and an augmented reality display system accurately overlays a virtual building information model (BIM) onto the real-world construction site, allowing builders to perform tasks with high precision and real-time validation without continuous site engineer presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional setting out methods using total station and control points are used, then positioning accuracy can be achieved, but frequent site engineer intervention is required causing delays and loss of time
Solution Approach 1:
The system enables builders to independently perform setting out tasks using the augmented reality headset that automatically displays BIM model information and positioning data, eliminating the need for continuous site engineer intervention while maintaining positioning accuracy through real-time tracking and registration
Solution Approach 2:
The patent replaces the mechanical total station system with an augmented reality-based optical tracking system that uses cameras and visual markers to achieve positioning and display construction information, thereby reducing dependency on specialized engineering equipment and personnel
2Ease of operation
If manual interpretation of construction drawings and validation processes are used, then construction tasks can be executed, but errors compound due to human interpretation and validation is time-consuming
Solution Approach 1:
The system creates a virtual copy of the BIM model and overlays it directly onto the physical construction site through the augmented reality headset, allowing builders to see exact positioning and dimensions without manual interpretation of drawings, thereby eliminating human error while maintaining operational simplicity
Solution Approach 2:
The system provides real-time feedback by displaying the virtual BIM model overlaid on the actual construction environment, allowing builders to immediately verify their work against the design model and correct any deviations before they compound
3Measurement precision
If 3D laser scanning and point-cloud processing are used for validation, then as-built model can be captured, but the validation process takes up to two weeks causing delays
Solution Approach 1:
The patent replaces the complex 3D laser scanning and point-cloud processing system with a simplified augmented reality-based visual validation system that provides real-time feedback by overlaying the BIM model with the actual construction, achieving validation accuracy instantly rather than over two weeks
Solution Approach 2:
The system creates a real-time virtual copy of the construction progress by overlaying the BIM model onto the physical site through augmented reality, allowing immediate visual comparison and validation without the time-consuming processes of laser scanning and point-cloud generation
Data Source
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AI summary
A headset for use in displaying a virtual image of a building information model (BIM) in relation to a site coordinate system of a construction site and a method for tracking a portable tool at a construction site. Both comprise deriving a transformation between a real-world coordinate system and an intrinsic coordinate system of a positional tracking system. The headset is communicatively coupled to one or more position-tracking sensors mounted thereon, has an augmented reality display system, and an electronic control system. The electronic control system is configured to convert a BIM model defined in an extrinsic, real world coordinate system into an intrinsic coordinate system defined by a position tracking system, receive headset tracking data from a headset tracking system and render a virtual image of the BIM relative to the position and orientation of the headset on the construction site which is viewable by the user as a virtual image of the BIM.