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균열결함 자동추출 육안조사 장비를 이용한 대구경 GFRP 하수관의 상태평가 기술 개발
박신전,지기환,유성원 한국복합신소재구조학회 2018 복합신소재구조학회 학술발표회 Vol.2018 No.04
Due to the sewer induced ground subsidence, there is an increasing demand for the advanced visual inspection technique for the existing sewer pipe structures. This study aim to develop a new condition assessment method using visual inspection device with automatic crack extracting and real-time gas monitoring systems for large diameter glass-fiber reinforced plastic sewer pipes. In this paper, a high-precision image capturing system that automatically extracts cracks in the large-diameter sewer pipes and sewage culverts with a diameter of 1,000 mm or more, and a real-time gas detection sensor for investigator safety were considered. By analyzing the module technology of the visual inspection device, the test device and their software for system integration were developed. It is expected that the developed technique inspecting conditions of the GFRP sewer pipes using the proposed visual inspection device in this study can be effectively used for various types of underground structures in the future.
약축 휨에 의한 인발성형 GFRP 교량 바닥판의 접착연결부 거동 연구
박신전,홍기증,이성우 한국복합신소재구조학회 2014 복합신소재구조학회 학술발표회 Vol.2014 No.04
It has been more than twenty years since the application of GFRP bridge decks in construction fields. Recently, a few studies by governments and individual researchers have investigated in-use GFRP bridge decks. Areas of trouble include the problems of cracking, spalling and the de-bonding of the pavement or the wearing surface on GFRP bridge decks, all of which affect the long-term durability and serviceability of these new construction materials. Related to these problems, reflective cracks on asphalt pavement are directly related to pultruded GFRP bridge decks. This study investigates the behavior of an adhesive joint under weak-axis bending by tests and FE analyses to identify the causes of pavement cracks in in-use pultruded GFRP bridge decks. In detail, the flexural stiffness and the load-carrying capacities in strong and weak axes are measured during bending tests on pultruded GFRP decks. Next, tensile local failures of an epoxy adhesive due to the concentration of deformations at adhesive joints are identified via a weak-axis bending test. Finally, the tensile failure of an epoxy adhesive due to the local concentration of deformation at an adhesive joint under weak-axis bending is verified through a finite element analysis.
연속굴착형 TBM 핵심모듈의 유지관리 및 최적 운영절차 연구
박신전 한국복합신소재구조학회 2024 복합신소재구조학회 학술발표회 Vol.2024 No.04
본 연구는 도로터널, 철도터널, 지하철, 전력구 등 각종 터널 시공을 위한 TBM(Tunnel Boring Machine) 기술의 시공성 향상을 위한 연속굴착형 TBM 장비와 나선형 세그먼트 통합 시공기술 개발 및 실증과 관련된 것으로 핵심모듈인 추진잭, 세그먼트 이렉터의 선제적인 유지관리를 통해 다운타임 을 최소화하고 굴진율을 안정적으로 확보하기 위한 연속굴착형 TBM 핵심모듈의 유지관리 및 장애대 응 기술에 대한 연구를 수행하였으며, 굴착환경과 연속굴착 운영특성을 고려한 시공 및 장비 운용 절 차를 정의하였다.
등벽드론 탑재형 영상기반 균열진단 시스템을 이용한 콘크리트 벽체 영상의 균열손상 위치 정확도 평가
박신전,박진태,이태희 한국복합신소재구조학회 2023 복합신소재구조학회논문집 Vol.14 No.2
This study is about a crack diagnosis system mounted on a wall-climbing drone developed to detect crack damages and evaluate the condition of facilities by acquiring high-quality precision images in an automated manner during visual inspection for precise safety diagnosis of vertical wall-type concrete structures. In this paper, it is presented a precision image acquisition technology using an image-based crack diagnosis system and a data processing technique using an automated image processing algorithm, and evaluated and analyzed the position accuracy of crack damages on a concrete wall image generated using an image processing automation algorithm based on the experimentally derived ground sample distance. The results of the evaluation analysis show that the position errors are up to 1.1% for the length of the horizontal axis and up to 1.4% for the length of the vertical axis. The proposed technique for estimating the location of crack damage based on the pixel coordinates in the image and the ground sample distance was evaluated to have an average location error of 1.0% or less compared to the ground truth data. Finally, it was analyzed that the position accuracy required for maintenance purposes such as image-based diagnosis and emergency repair is secured.