• 한국건설관리학회논문집
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• 제23권1호
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• pp.37-45
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• 2022

본 연구는 구조물이 하중과 외부요인으로부터 피해를 받을 경우 구조물의 안정성을 판단하기 위해서 발생하는 변위를 측정하는 방법론을 제시하고 실험을 통한 검증을 보여준다. 변위측정은 모아레의 원리를 이용 하였으며 이를 통해 구조물의 미세한 변위를 증폭하여 관찰 할 수 있다. 실험은 실제 현장의 파이프 서포트와 동일한 지름의 파이프를 사용하였으며 파이프가 수평으로 움직인다는 가정하에 파이프의 수평 변위에 따른 모아레 간섭무늬의 수직 변위를 측정하였다. 실험 결과 파이프의 수평 변위와 간섭무늬의 수직 변위의 선형 관계를 확인하고 관계식을 도출하였다. 추가적으로 카메라를 이용한 방법론을 적용하기 위해 수직부재와 카메라 사이의 거리에 따른 간섭무늬 변위의 관계식을 도출하여 카메라의 위치에 상관없이 방법론을 적용할 수 있게 하였다. 결론적으로 본 연구에서 제시한 방법론을 통해 카메라를 이용하여 거리에 상관없이 다수의 수직부재 변위를 동시에 측정하고 구조물의 안전성을 판단하여 붕괴를 감지할 수 있다.

• 콘크리트학회논문집
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• 제16권2호
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• pp.139-146
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• 2004

최근 들어 가설기자재의 성능에 대한 관심이 급속히 증가하고 있다. 1992년 산업안전보건법에 의해 가설기자재 성능검정제도가 도입된 이후, 최근 2년간에 걸쳐 실시한 성능시험을 토대로 강제파이프서포트에 대한 기초적 연구를 진행하였다. 강제파이프 서포트의 국내 규격과 현재 연구현황을 소개하였으며, 총 849개의 시편을 대상으로 외관과 내경의 길이 및 두께조사와 겹침길이 및 평압시험과 나이프에지시험 등의 압축강도시험을 실시하였다. 전체적으로 신품과 재사용품으로 구분하여 시험을 하였으며, 재사용품의 성능감소를 파악할 수 있었다. 규격 또한 신품에 비해 많은 부분 부족한 것으로 나타났다 일반적으로 재사용품이 $10\%$ 정도의 성능감소를 파악할 수 있었으며, 이를 고려하여 볼 때 현장에서의 품질확인과 감독이 반드시 필요할 것으로 판단되었다. 우선 기초적인 결과를 토대로 통계값을 제시하였고, 각 영향요소별 세부분석은 현재 연구진행중이다. 본 연구결과는 향후 파이프서포트에 대한 기본자료로 활용될 것으로 기대된다.

• 한국산업안전학회:학술대회논문집
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• 한국안전학회 2004년도 춘계 학술발표회
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• pp.334-339
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• 2004

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.4-5
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• 2020

Pipe support is a representative structure that supports slab formwork, and it is a representative temporary equipment that has been systematically managed since the 1990s when the domestic temporary equipment performance test system was introduced. Nevertheless, it is also a reality that many of the products in circulation are used products that are reused and do not meet the performance of the initial manufacturing stage. However, if only new products are insisted, it could lead to delays in the process due to an increase in construction costs and difficulties in timely delivery. On the contrary, it is not acceptable for the safety of the construction site to use products of low quality without verification procedures or standards. Therefore, this study attempts to grasp the management system such as safety certification for temporary equipment and the actual condition of quality control to maintain performance, and propose improvement plans.

• 한국산업안전학회:학술대회논문집
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• 한국안전학회 2005년도 춘계 학술발표회
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• pp.103-111
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• 2005

• 한국산업안전학회:학술대회논문집
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• 한국안전학회 2004년도 춘계 학술발표회
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• pp.436-441
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• 2004

• 대한조선학회논문집
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• 제50권6호
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• pp.458-465
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• 2013

Ship design engineering refers to the development and design of shipbuilding architectures in a drawing which reflects all relevant manufacturing processes. This paper provides analysis methods for model-information interfaces between hull structure design and outfitting design, and a technical application for manufacturing phases reflecting the pipe support pad and angle item automatically. The existing information procedure of pipe support pad and angle system processes information using drawing without model specification. Outfitting design team directly distributes drawings to the shop floor then manual-based marking and installation work are conducted refer to the distributed drawings. As a result, this process has become time consuming and causes problems in the productivity and quality improvement due to the rework caused by omitted or incorrect marking. The pipe support pad and angle marking is a method that automatically updates model information to hull structure design using sets of data that analyse the generated model in outfitting design processes. Therefore, this approach provides an efficient solution through design references without manual activities such as a reflection of hull structure design, cutting process, numerical control work, and dimension measurement and marking. The conversion of a method from the existing procedure based on manual marking to the reflective and automatic approach would have enabled to proceed installation work without manual activities for the measurement. Therefore, this research study proposes an efficient approach using pre-data analysis of model information interfaces between design and manufacturing phases to improve productivity during construction for shipbuilding.

• 한국안전학회지
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• 제16권1호
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• pp.59-64
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• 2001

Even though there is a guideline for the required strength of pipe support in inspection, it does not mean the nominal strength which can be used for the form work design. And, Concrete Specification defines that the pipe support should be designed according to the steel design guidelines but the design details are not provided, such as buckling length and the sectional modulus, etc. For the better prediction of strength of pipe support, the slenderness ratio of support which reflects the boundary condition should be considered. In this paper, the elastic buckling formula based on the slenderness is derived. The formula contains the strength reduction factor that consider the strength deduction caused by initial lateral deformation and is 0.65 consistently regardless of boundary conditions. And the coefficient of effective buckling length is calculated from the experiment.

• 한국안전학회지
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• 제27권5호
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• pp.105-110
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• 2012

Steel elements are widely used for temporary structures on every construction site. but despite its strong resistences against heavy concrete volumes, they are easily eroded by oxygens in the space as times have been gone. If they are used several times in the construction fields, their elements are rusted and deformed and the strength is gradually reduced through the weak part. From this point of view, aluminum pipe support has been developed in stead of steel pipe sopport with enhancing durability against oxygens all the more. The developed aluminium pipe support has been lighter than steel unit, so workability has been improved. In another advantage of aluminium pipe support, different level control is possible with being equipped with the level control nut which enables the length adjustment of aluminium pipe support and the collapse of aluminum pipe support could be also prevented from the structures in the long term.

• 한국안전학회지
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• 제19권2호
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• pp.93-97
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• 2004

Slab formwork consists of sheathing, stringer, hanger and shore. There are several types of adjustable individual shores. In constructions site, pipe supports are usually used as shores. The strength of a pipe support is decreasing as it is frequently being used at the construction site. In this study, 2857 pipe supports were bought to fine out the strength change of used pipe support and unused pipe supports according to aging. Among these pipe supports, 2337 pipe supports were lent to the construction companies free of charge. Compressive strength was measured by knife edge test and plate test at each 3 month. Test results show that the strength of unused pipe supports almost equaled to the strength of new pipe supports until 191 days, but the strength of used pipe supports at 191 days was lower than the strength of new pipe supports. So, the strength of used pipe supports at 191 days was not satisfied the specification of KS F 8001. According to these results, it shows that attention has to be paid to formwork design using used pipe supports. Therefore, the paresent study results will be able to provide a firm base to design slab formwork and test the performance of used temporary structure and prevent formwork collapses.