Sensor-Based Precast Member Reuse for Safe Building Dismantling
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Solution Overview
Problem
Conventional methods for reusing precast concrete members in buildings do not ensure quality and safety due to damage during use, making it difficult to construct safe buildings with reused materials.
Innovation Solution
Attach sensors to precast members joined by unbonded tendons to monitor physical quantities, determine reusability based on sensor data, and perform visual inspections and repairs to ensure quality before reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precast members are reused without quality monitoring, then construction cost and time are reduced, but safety and reliability deteriorate
Solution Approach 1:
Sensors are attached to precast members during the construction phase before they are put into service. This preliminary action enables continuous monitoring of physical quantities throughout the member's service life, ensuring quality data is available when reuse decisions are made without adding complexity to the reuse process itself.
Solution Approach 2:
The monitoring system provides feedback on the physical state of precast members through continuous measurement of physical quantities. This feedback mechanism allows for objective assessment of member condition, enabling reliable reuse decisions based on actual performance data rather than subjective evaluation.
2Reliability
If sensors are attached to all precast members for monitoring, then quality assurance improves, but construction cost and complexity increase
Solution Approach 1:
Sensors are selectively attached to specific precast members based on their importance, usage conditions, and risk factors. This local quality approach ensures that monitoring resources are concentrated on members where quality assurance provides the greatest benefit, rather than uniformly monitoring all members.
Solution Approach 2:
The system monitors changes in physical quantities over time to assess member condition. By tracking parameter changes rather than requiring constant physical inspection, the system achieves comprehensive quality assurance with minimal interference to construction productivity.
3Reliability
If precast members are inspected and repaired before reuse, then safety improves, but time and cost increase
Solution Approach 1:
Quality monitoring data is collected during the entire service life of the building, so when dismantling occurs, the assessment of reuseability is already based on comprehensive historical data. This preliminary data collection eliminates the need for extensive post-dismantling inspection time.
Solution Approach 2:
Physical inspection and testing of precast members is replaced by electronic sensor data analysis. The monitoring system automatically assesses member condition through measured physical quantities, substituting time-consuming manual inspection with rapid electronic evaluation.
Data Source
AI summary
In a reuse method for precast members of a building having a rigid frame structure, when a building provided with multiple precast members including multiple pillar members and multiple beam members is constructed, a sensor is attached to at least one of those of the precast members that are joined to each other by unbonded tendons. During use of the building, the physical quantity P of the precast member detected by the sensor is monitored. When the building is dismantled, the reusability of the precast member is determined based on the detection result of the sensor, and the precast member determined to be reusable is reused in another building to be constructed.