BIM Generation via 2D Plan and 3D Scan Comparison

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Solution Overview

Problem

The construction industry faces challenges in generating accurate 3D building information models for existing buildings, as current methods either rely on incomplete 2D plans or time-consuming and error-prone 3D point cloud scanning, which fail to capture current building states and material details effectively.

Innovation Solution

A method that combines reading 2D digitized building plans with 3D scanning data, using comparison and detection algorithms to generate a building information model by integrating object data, allowing for real-time synchronization and automated object recognition, reducing manual processing and inaccuracies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a 3D point cloud model is generated by laser scanning, then the model corresponds to the current state of the building, but a large number of information pieces (such as wall thickness or material) are not included and must be input retrospectively

Engineering Contradiction:

Improveaccuracy of building state representationVSAvoidtime for retrospective information input

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by integrating object recognition and information extraction during the scanning process itself. The system automatically recognizes building objects and extracts relevant information (such as wall thickness and material) at the time of data acquisition, rather than requiring retrospective manual input after scanning is complete.

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If a 3D point cloud model is generated by laser scanning, then the model corresponds to the current state of the building, but information has to be exchanged via several interfaces and/or people from different trade companies which is time-consuming and error-prone

Engineering Contradiction:

Improveaccuracy of building state representationVSAvoidcomplexity of information exchange interfaces

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies self-service by enabling the scanning system to automatically perform object recognition and information extraction without requiring manual intervention or coordination between multiple trade companies. The system independently identifies building objects, extracts their properties, and integrates this information into the BIM model autonomously.

Inventive Principle:

Principle #25Self-service

3Productivity

If rooms are scanned one after another using a laser, then a 3D point cloud model can be generated, but inaccuracies may arise because the point cloud illustration of an identical wall scanned from two sides cannot be referenced sufficiently

Engineering Contradiction:

Improvespeed of scanning processVSAvoidaccuracy of wall representation

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent applies merging by combining point cloud data from multiple scanning directions and merging them with 2D building plan information. The system integrates data scanned from different sides of walls and combines it with authoritative 2D plans to resolve ambiguities and create an accurate unified representation of building elements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses the 2D building plan as an intermediary to mediate between multiple point cloud scans of the same wall from different sides. The 2D plan serves as a reference that helps correctly identify and merge corresponding wall features from different scanning perspectives, resolving the ambiguity of identical wall illustrations.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Ease of manufacture

If object recognition is used to supplement 3D models with formal object descriptions, then doors and windows can be identified, but changes in the buildings (such as removal of a wall) not documented in the original 2D plan are not detected

Engineering Contradiction:

Improveease of model generationVSAvoidaccuracy of building state documentation

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies parameter changes by comparing the 3D scanned data with the 2D building plan to detect deviations and changes. The system identifies modifications such as removed walls by analyzing differences between the original plan parameters and the current scanned state, thereby detecting changes that were not documented in the original plans.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20230053615A1Generation of a building information model

Publication Date: 2023.02.23 SIEMENS SCHWEIZ AG

AI summary

A method and a system for generating a building information model, in particular a BIM model, in order to work on the building, such as in the case of restoration work, for example. A two-dimensional, digitized building plan of the building is read in, wherein the building plan includes building objects and building object data assigned to the building objects. A scanning unit is used to acquire three-dimensional building data that are compared with the building plan. A building object in the building plan is detected based on the comparison data and the building object data of the building object are output. The building information model is generated from the three-dimensional building data and the detected building object and the building object data thereof are integrated into the building information model. The building information model is output for working on the building.