Automated Rebar Inspection via 3D Point Cloud and BIM Comparison

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Manual inspection of rebar structures in construction sites is slow, tedious, and costly, requiring significant manpower and time, which can lead to costly mistakes and delays in construction.

Innovation Solution

A computer-aided rebar measurement and inspection system that uses data acquisition, 3D point cloud generation, rebar detection, measurement, and discrepancy detection to automate the inspection process, comparing rebar structures to Building Information Models (BIM) for compliance, reducing the need for manual labor and increasing efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If manual inspection of rebar structures is performed, then inspection accuracy can be ensured, but inspection time and labor costs increase significantly

Engineering Contradiction:

Improveinspection accuracyVSAvoidinspection time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces manual mechanical inspection with an automated optical measurement system using lasers and cameras to capture rebar structure data, eliminating the need for manual measurement while maintaining inspection accuracy

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent creates a digital 3D point cloud model copy of the actual rebar structure, allowing for automated comparison against the BIM model without requiring physical manual inspection of each rebar element

Inventive Principle:

Principle #26Copying

2Measurement precision

If manual inspection of rebar structures is performed, then detailed measurements can be obtained, but labor costs and resource allocation increase

Engineering Contradiction:

Improvemeasurement detailVSAvoidresource allocation

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces manual inspection tools with automated laser scanners and imaging systems that capture detailed rebar measurements automatically, reducing the need for multiple inspectors and associated resources

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system performs self-measurement and self-inspection by automatically capturing data, processing images, generating 3D models, and comparing against BIM requirements without human intervention in the measurement process

Inventive Principle:

Principle #25Self-service

3Productivity

If automated measurement systems are implemented, then inspection speed increases, but system complexity increases

Engineering Contradiction:

Improveinspection speedVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent divides the inspection system into modular functional components: data acquisition module, 3D point cloud generation module, rebar detection module, measurement module, and discrepancy detection module, allowing for manageable system complexity while maintaining high inspection speed

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a computer as an intermediary that automatically processes raw measurement data, generates 3D models, detects rebar elements, performs measurements, and compares results against BIM requirements, managing system complexity through automated computation

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If comprehensive rebar inspection is performed on large scale structures, then compliance accuracy improves, but time and manpower requirements increase prohibitively

Engineering Contradiction:

Improvecompliance accuracyVSAvoidinspection duration

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces manual inspection of thousands of rebar elements with automated laser scanning and image processing that can rapidly capture and analyze entire sections of rebar structures, maintaining compliance accuracy while dramatically reducing inspection duration

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent transitions from 2D manual measurement to 3D point cloud modeling, enabling comprehensive inspection of complex rebar structures in three dimensions and allowing for more efficient detection of compliance issues across large scale structures

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS10810734B2Computer aided rebar measurement and inspection system

Publication Date: 2020.10.20 SRI INTERNATIONAL

AI summary

Embodiments of the present invention generally relate to computer aided rebar measurement and inspection systems. In some embodiments, the system may include a data acquisition system configured to obtain fine-level rebar measurements, images or videos of rebar structures, a 3D point cloud model generation system configured to generate a 3D point cloud model representation of the rebar structure from information acquired by the data acquisition system, a rebar detection system configured to detect rebar within the 3D point cloud model generated or the rebar images or videos of the rebar structures, a rebar measurement system to measure features of the rebar and rebar structures detected by the rebar detection system, and a discrepancy detection system configured to compare the measured features of the rebar structures detected by the rebar detection system with a 3D Building Information Model (BIM) of the rebar structures, and determine any discrepancies between them.