사무소 건축물의 화재안전성능 평가 모델

이찬식,Lee, Chan-Sik 대한산업안전협회 2004 안전기술 Vol.81 No.-

천연해수 중 온도 변화에 따라 전착한 환경친화적인 석회질 피막의 특성 분석

이찬식(Chan-Sik Lee),강준(Jun Kang),이명훈(Myeong-Hoon Lee) 한국마린엔지니어링학회 2015 한국마린엔지니어링학회지 Vol.39 No.7

천연해수 중 전류밀도 변화에 따라 형성된 환경친화적인 전착 코팅막의 특성 분석

이찬식(Chan-Sik Lee),배일용(Il-Yong Bae),김기준(Ki-Joon Kim),문경만(Kyung-Man Moon),이명훈(Myeong-Hoon Lee) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.5

Calcareous deposits are the consequence of pH increase of the electrolyte adjacent to metal surface affected by cathodic current in seawater. It obviously has several advantages over conventional coatings, since the calcareous deposit coating is formed from coating (Mg²?, Ca²?) naturally existing in seawater. In consideration of this respect, environment friendly calcareous deposit films were formed by an electro deposition technique on steel substrates submerged in 48℃ natural seawater. And the influence of current density, coating time and attachment of steel mesh on composition ratio, structure and morphology of the electrodeposited films were investigated by Scanning Electron Microscopy(SEM), Energy Dispersive Spectroscopy(EDS) and X-Ray Diffractor(XRD), respectively. Accordingly, this study provides a better understanding of the composition between the growth of Mg(OH)₂ and CaCO₃ during the formation of electro deposit films on steel substrate under cathodically electrodeposition in 48℃ natural seawater. The Mg compositions, in general, are getting decreased regardless of current density but Ca compositions are getting increased as electrodeposition time runs. That is, Mg(OH)₂ compounds of brucite structure shaped as flat type is formed at the initial stage of electrodeposition, but CaCO₃, compounds of aragonite structure shaped as flower type is formed in large scale. Besides, Mg(OH)₂ compounds were much formed at 5 A/㎡ environment condition compared to the 3 A/㎡ and 4 A/㎡ environment conditions. This is because that OH? which was comparatively largely generated at the metal surface is preferably combined with Mg²?.

노출콘크리트 시공단계 품질관리 기준에 관한 실험연구

정재수,이찬식,Jeong, Jae-Soo,Lee, Chan-Sik 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.2

콘크리트는 구조용 재료의 하나로 인식되어 많은 연구개발 및 적용이 검토되어 왔지만, 의장적 기능을 가지는 마감재로서의 콘크리트 관리방안에 대한 연구는 부족했다. 노출콘크리트는 일반 콘크리트에 비해 더욱 많은 공사비와 체계적인 품질관리가 요구됨에도 불구하고 품질관리 방안이 구체적으로 확립되어 있지 않다. 이에 본 연구에서는 노출콘크리트 노출면의 품질확보를 위해 기존 연구 및 사례를 조사하여 품질에 영향을 미치는 다양한 요인을 분석하고, Mock-Up 실험을 통해 거푸집 제작, 콘크리트 배합, 콘크리트 타설 방법에 따른 노출콘크리트면의 품질을 비교분석하였다. 콘크리트 배합 측면에서는 단위결합재량, 단위수량, 시공측면에서는 거푸집 종류, 슬럼프, 다짐시간, 다짐방법 등 시공단계의 품질관리 기준을 제시하여 노출콘크리트의 품질관리를 위한 기초자료를 제공하고자 한다. A variety of studies on concrete have been performed to examine the advantages for structural material, but less attention has been paid to the contribution of concrete to finishing. Due to this matter, specific management guidelines for construction and quality on exposed concrete have not been clearly established despite more construction cost and quality control are required. This study analyzed a impact factors on the quality by survey of the existing research and practice. Field tests were performed using mock-up models to analyze the quality of exposed concrete according to form manufacture method, concrete mix proportion, and concrete placing method. Results indicate that the quality of exposed concrete was determined by concrete mix proportion and construction managements. Guidelines of quality control on exposed concrete in construction stages were proposed.

퍼지이론을 이용한 초기 건설공사의 리스크 관리 방법

황지선,이찬식,Hwang Ji-Sun,Lee Chan-Sik 한국건설관리학회 2004 건설관리 : 한국건설관리학회 학회지 Vol.5 No.2

본 논문은 초기 건설공사의 리스크 관리방법론을 제시한 것으로서, 리스크식별 및 분석을 중심으로 연구를 진행하였다. 리스크식별은 초기 건설공사를 $공통공사\cdot토공사\cdot지정$ 및 기초공사로 구분하여 리스크를 규명하고 작업분류체계에 기반하여 리스크분류체계를 제안하였다. 리스크분석은 리스크분류체계를 바탕으로 퍼지추론을 이용하여 리스크인자의 위험도를 정량화하고 퍼지척도를 이용하여 리스크인자의 중요도를 산정하였으며, 이를 통합하여 상위 리스크인자의 종합위험도를 구하기 위해 퍼지적분을 이용하였다. 리스크인자의 관리 우선순위는 종합위험도로부터 결정할 수 있다. 본 연구에서 제시한 리스크 관리 방법론의 타당성을 확인하기 위하여 사례적용을 실시하였으며, 그 결과 제시한 방법론이 현장 및 공사의 특성을 반영하여 리스크인자의 관리 우선순위를 결정하는데 충분히 활용할 수 있음을 확인할 수 있었다. This study presents a risk management methodology using fuzzy theory for early construction stage and is focused on risk identification and risk analysis. This study identifies various risk factors associated with activities clearly construction stage, then establishes the Risk Breakdown Structure(RBS) by classifying the risks into the three groups; Common risks, risks for Earth works, and risks for Foundation works. The risk analysis method presented in this study is based on the RBS that has two levels such as upper level and lower level. The risk exposure of lower level risk factors is assessed by fuzzy inference. The weight of risks is estimated by fuzzy measure. Then, the estimated risk exposures and weights are aggregated to assess the risk exposure of upper level risks by Choquet fuzzy integral. The risk exposure of upper level risks determine the priority of risk factors in view of risk management. This study performs case study to validate the proposed method. The result of case study shows that the methodology suggested in this thesis would be utilized well in evaluating risk exposure.

실적자료에 의한 고등학교 시설 공기산정

권동찬,이찬식,Kwon Dong-Chan,Lee Chan-Sik 한국건설관리학회 2004 건설관리 : 한국건설관리학회 학회지 Vol.5 No.6

The construction duration for any building or facilities such as high school building influence the quality of the building as well as the total cost for them. Since there are no guidelines to estimate construction duration correctly, an employer(or owner) estimate it by their own experience or intuition. Therefore some conflicts related to construction duration happen between contract parties during construction. The purpose of this study is to suggest a predictive model which helps decision makers calculate exact net working days for high school building construction at the early stage of the construction project. To measure net working days for high school construction, 15 data were collected from actual spot in Incheon region. Multiple linear regression analysis was conducted to obtain the model which calculate construction duration for the substructure, the superstructure and the finishing works. total construction duration could be obtained by adding net working days to non working days which would be based on the meteorological statistics for Incheon region since 1974 to 2003. 공사에 소요되는 기간은 시설물의 품질과 비용에 직접적인 영향을 미치지만, 고등학교 시설공사의 경우 경험과 직관에 의거하여 공기를 산정하고 있어 공사수행과정에서 계약당사자 간에 분쟁이 많이 발생하고 있다. 본 논문은 고등학교 시설공사에 소요되는 기간의 산정에 영향을 미치는 다양한 요인을 분석하여 공기 산정기준을 제안하는 것으로, 인천지 역에서 최근에 개교한 고등학교의 실적자료를 수집하여 다중선형 회귀분석 하였다. 회귀분석 결과로 얻은 순 공사기간에 인천지 역의 기후특성을 고려하여 산정한 작업불가능기간을 더하여 총 공사기간을 산출 하였다. 본 논문에서 제안한 공기 산정식은 공사발주 및 계약 시 계약공기를 정확하게 산정 하는데 도움을 줄 수 있을 것이다

중ㆍ고령 건설근로자의 재해특성

이정철(Lee Jeong-Cheol),이찬식(Lee Chan-Sik) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.5

The construction industry has been playing an important role in domestic economy growth over the past half a century, but a significant number of accidents have occurred in the industry. The Korea Workers' Compensation & Welfare Service(COMWEL) reported that compensation expense for construction accidents occupied about 30 percent of its compensation budget. This is a serious figure considering that the number of construction workers account for only 8 percent of entire workforce. Workers over fifty years old are increasing in the construction field every year. Those aged workers are the most vulnerable for construction accidents. Physical and psychological changes by aging would contribute to high accident rate. This paper analyzed accident types and characteristics for aged workers older than 50. According to the analysis of 252 fatal accident cases of the aged construction workers, injury occurred much more frequently at reinforced concrete works and finishing works, for form carpenter and common laborer, and in small construction projects, respectively. Moreover, it was analyzed that fall accidents on a temporary structure were the primary cause of raising the accident rate of aged construction workers.

중ㆍ고령 건설근로자의 재해 분석

이정철(Lee Jeong-Cheol),신승우(Shin Seung-Woo),이찬식(Lee Chan-Sik) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1

The domestic average life span is increasing due to the growth of economy, society and the improvement of living standards. So the aging society is rapidly approaching in Korea. There is gradually increasing the number of senior people from 50 to 64 years old in total productive population. Especially, according to the increase of the middle and advanced age, accident rates of the middle & advanced-aged construction workers has considerably increased at the construction site. It has been analysed that the occurrence status of the total and fatality accident for each age group in construction field for 5 years. The results are as follows, the number of workers over 50 years old accounts for about 37 ~ 41 percent in total accident and about 41 ~ 47 percent in fatality accident. Those figures are much bigger than the other aged group. The research and analysis have been performed on the industrial accident status and cause of the middle & advanced-aged construction workers. This paper may provide useful information about appropriate disposition and safety precaution of the middle & advanced-aged construction workers.

자연생태환경분야의 환경친화적 건설사업관리를 위한 환경성 검토항목

윤호빈,이찬식,이영준,Yoon, Ho-Bin,Lee, Chan-Sik,Lee, Young-Joon 한국건설관리학회 2008 건설관리 : 한국건설관리학회 학회지 Vol.9 No.2

자연환경을 고려하지 않은 무분별한 개발행위로 인하여 환경오염과 생태계 파괴 등의 문제가 발생하고 있다. 국제사회에서도 환경규제가 엄격해짐에 따라 환경오염 문제는 세계적인 관심사가 되고 있다. 우리나라에서도 사전환경성검토제도, 환경 영향평가제도 등과 같은 환경을 보전하려는 노력이 다각도로 전개되고 있으며, 이는 건설사업에 미치는 영향이 매우 크다. 자연생태환경분야의 환경영향요인을 체계적으로 분석하고 반영하지 않아 건설사업이 지연 및 중단되고 사업의 타당성을 재검토하는 등 대규모 국책사업이 차질을 빚는 경우가 많다. 생태계 기능과 균형이 파괴되지 않도록 자연환경을 보전하고 건설행위로 발생될 수 있는 환경오염문제를 최소화하여 환경 친화적인 건설사업이 시행되어야 한다. 본 논문에서는 마스터플랜단계, 기본계획 및 실시설계단계, 시공단계, 유지관리단계 등 건설사업의 전단계에서 적용할 수 있는 자연생태환경분야의 환경요소별 검토항목을 제시하였다. 이 연구에서 제시한 환경성 검토항목은 마스터플랜단계에서는 의사결정자, 기본계획 및 실시설계단계에서는 설계자, 시공 및 유지관리 단계에서는 건설사업관리자들에게 환경적인 측면에서 지속가능한 개발(sustainable development)을 유도하는데 도움을 줄 것으로 기대된다. Environment-indifferent developments have brought about a great deal of environmental pollution and a destruction of the ecosystem. The global interest in environmental pollution has emerged in accordance with the environmental regulations becoming ever stricter in the international society. Various attempts are being pitched in Korea such as the PERS (Prior Environmental Review System) and EIA (Environmental Impact Assessment) and they practice a significant impact on the construction industry. Recently, there have been cases where large-scale national development businesses are delayed and terminated or re-examined for their feasibility for not having reflected and analyzed the environmental factors of the natural and ecological environment. We must sustain the ecological functions and balance and minimize environmental pollution issues that can be caused by land developments and preserve the natural environment so to induce environmentally-friendly development businesses. Thus, this research paper proposes environmental review categories of the natural ecosystem sector that can be applied to all stages of construction businesses including master planning stages, basic planning and execution designing stage, construction stage, and maintenance stage. The environmental review categories proposed in this paper are expected to offer a great deal of support in terms of inducing environment-sustainable development to decision makers in the master plan stage, designers in the basic planning and execution designing stage, and construction managers in the construction and maintenance stages.

거주중 공동주택의 지하주차장확대를 위한 흙막이공법 선정

노영창,이찬식,Ro, Young-Chang,Lee, Chan-Sik 한국건설관리학회 2008 건설관리 : 한국건설관리학회 학회지 Vol.9 No.2

경제수준의 향상에 따른 자동차보급율의 급격한 증가는 공동주택단지의 주차공간 부족현상을 심화시키고 있다. 준공 당시에는 주차장 설치기준을 만족하였겠지만, 현재의 법규나 주민의 요구를 만족시키지 못하는 실정이다. 노후 공동주택은 건물구조체의 내구성에 문제가 없음에도 불구하고, 설비의 노후화와 주차공간의 부족으로 기존의 건물을 철거하고 재건축하는 방법을 채택하는 경우도 있다. 이로 인한 국가적 차원의 자원낭비와 자원의 재활용 및 재사용 측면에서 문제가 많다. 또한 주차난으로 인한 화재 사망사고도 발생한 사례가 있다. 공동주택의 주차난은 단순한 불편함이 아닌 안전에 관계된 심각한 문제이다. 단지 전체의 리모델링이 아닌 주차장 확장만을 위한 리모델링이 필요하다. 본 연구는 주민들이 이주를 하지 않고 거주하는 중에 지하주차장 확대를 위한 흙막이 공법선정 방안을 제안하는 것을 목적으로 수행되었다. 흙막이공법 선정시 영향요인을 분석하고, AHP기법을 적용하여 가중치를 산정하였다. 전문가를 대상으로 흙막이공법의 적용성 평가를 실시하여 거주중에 적용 가능한 흙막이공법 선정방안을 제시하고 민감도분석을 실시하였다. 본 연구에서 제안한 공법선정 평가방법은 거주중 지하공사 흙막이공법 선정시 의사결정에 도움을 줄 수 있을 것으로 기대된다. Rapidly increasing automobile supply rate according to improved economic level of life makes lack of parking space of apartments. Even though the initial design of parking space compiled with old regulations, it may not observe either new laws or requirement of inhabitants. Even if old apartments have no structural durability problem, outworn facilities and insufficient parking area may be a main reason for reconstruction. It causes waste of national resources and makes recycling issues. Additionally, irregularly parked cars make traffic obstruction to a fire engine and result in many fire accident victims. Parking problems of apartments are not only inconvenience but also serious safety issues. From these points of view, remodeling only for parking area expansion is necessary to avoid overall reconstruction of apartments. The purpose of this study is to suggest a retaining wall selection method for apartments underground parking lots expansion without evacuation of resident people. Effect factors to select retaining wall system are analyzed and weight values are calculated by applying AHP. One selection method of retaining wall is proposed by evaluating applicability and its sensitivity analysis is executed. This selection method is expected to help decision-making of retaining wall system selection.