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송용식,이동훈,이성호,김선국 한국건축시공학회 2011 한국건축시공학회지 Vol.11 No.4
The recent expansion in the number of housing construction projects has been accompanied by substantial improvements in construction quality, which can be attributed to the development of new construction technologies and materials. In apartment complex construction projects, numerous mechanization technologies have been adopted as part of the floor plastering process to counter increasing difficulties in securing labor and the pressing need to reduce lead time, but these have also triggered setbacks such as additional costs or loss of time to fix cracks in or loosening of floor. Cracks developing in the floor of an apartment housing unit, in terms of materials in use, are the products of a complex combination of material makeup, construction workmanship, concrete curing and the protection method. Controlling such elements from the perspective of materials in use may ensure partial success in reducing cracks, but fall short of eliminating them completely. Any attempt to prevent cracks from developing in the first place requires systematic analysis as to their potential causes and viable solutions to reduce them. On this backdrop, this paper aims to provide an analysis of potential causes of cracks found in floor plastering, and consider the mechanism of a crack stop-bar as a fundamental safeguard against them. 최근 주택 건설은 양적으로 팽창하면서 신공법, 신소재의개발로 품질에 많은 발전을 하고 있으나 공동주택 공사 중방바닥 미장은 인력난과 공기단축을 해결하기 위해 기계화시공을 함으로서 방바닥 미장의 크랙발생 및 들뜸 현상으로인한 하자 발생으로 경제적, 시간적 낭비가 많다. 공동주택바닥미장의 균열은 재료적인 측면에서 볼 때 사용재료의 구성과 시공정도, 양생, 보양방법에 따른 각 요인이 복합적으로 작용하여 발생된다. 그러나 재료적인 측면에서 위 요인들을 제어하여 균열을 부분적으로 억제할 수 있으나 근본적인 균열방지는 불가능하다. 균열의 발생을 억제하기 위해서는 바닥미장 균열의 발생원인과 균열 저감기술에 대한 논리적인 분석이 필요하다. 따라서 본 연구에서는 바닥미장 균열의 원인과 근본적인 억제를 위한 균열차단막의 메커니즘을 분석하고자 한다.
송용식,이준석,정현규,조원철,이태식,Song. Yong-Sig,Lee. Jun-Suk,Jeong. Hyun-Gyu,Cho. Won-Cheol,Lee. Tae-Shik 한국방재학회 2007 한국방재학회 학술발표대회논문집 Vol.2007 No.1
The explosionproof apparatus is a devices that is enclosed in a case capable of withstanding an explosion of a specified gas or vapor that may occur within it and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby This kind of exeplosionfproof devices should be installed suitable for the characteristics of the space or process condition that should be protected to prevent explosion or fire. But, due to the lack of information and techniques on the explosionproof technology, some dangerous area is not properly protected from an explosion or it cost too much to implement the explosionproof devices. In this report, the basic guidelines and several case studies of explosionproof devices installation will be introduced to be of help to field safety engineer.