• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.83-84
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• 2019

Free-form buildings refer to geometric external structures in curved form, unlike conventional structures with straight lines. The development of construction technologies for the implementation of these Free-form buildings is ongoing. However, there are still many restrictions on the construction technology of Free-form buildings, resulting in problems such as increased construction period and increased construction costs. Therefore, it is urgent to develop building technology for the construction of Free-form building in order to secure competitiveness in the global Free-form building market. Accordingly, this study proposes Two-sided multi-point press technology that can solve problems of existing technology and implement FCP(Free-form Concrete Panel).

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2009년도 춘계 학술논문 발표대회 학계
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• pp.155-158
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• 2009

During the construction project period, a lot of change orders happen in the design and construction stage Especially, The change order during construction stage causes the huge construction cost increase and duration delay. Accordingly, research on the change order of the construction stage is being progressed relatively active in the design stage, but the design changes are rarely made. In the design stage, the owner has to pay a design addition cost when change order due to the demands of owner happens. However Korea has not the specific standard about design additional cost in design stage. Therefore, this study analyzes problems of design additional cost estimation methods through the case study, and then indicates the method that the ratio distributes to details dividing design tasks and the method of the PM(Project Management). Eventually, this study expects to minimize claim related the design additional cost in design stage.

• Safety and Health at Work
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• 제12권2호
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• pp.277-281
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• 2021

Singapore's construction sector employs more than 450,000 workers. During the height of the COVID-19 pandemic in Singapore from April to June 2020, migrant workers were disproportionately affected, including many working in the construction sector. Shared accommodation and construction worksites emerged as nexuses for COVID-19 transmission. Official government resources, including COVID-19 epidemiological data, 43 advisories and 19 circulars by Singapore's Ministries of Health and Manpower, were reviewed over 8 month period from March to October 2020. From a peak COVID-19 incidence of 1,424.6/100,000 workers in May 2020, the incidence declined to 3.7/100,000 workers by October 2020. Multilevel safe management measures were implemented to enable the phased reopening of construction worksites from July 2020. Using the Swiss cheese risk management model, the authors described the various governmental, industry, supervisory and worker-specific interventions to prevent, detect and contain COVID-19 for safe resumption of work for the construction sector.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.230-231
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• 2021

In this study, Dr. Bae Kyu-woong of the Korea Institute of Construction Technology developed a concrete module that was lightweighted to 1700kN with KC modules and met housing performance standards. It solves Construction lifts problem that was the limit of the PC module, and is an innovative model that greatly improves Construction period and economics with boxed modules, and is manufactured in the factory by extruded molding in vibration, noise, fireproofing standards, etc., and has the advantage of excellent precision and high strength. Therefore, if the framing house of a precast concretecan only be standardized in construction, its potential for growth will be endless. To do this, standardization, standardization, and modularization of the design are essential.

• 국제학술발표논문집
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• The 7th International Conference on Construction Engineering and Project Management Summit Forum on Sustainable Construction and Management
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• pp.353-361
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• 2017

In order to improve the urban ecological environment, the central government has developed a series of water pollution control policies and measures since April 2015, and required local governments to complete the work of the polluted river and lake restoration within specified period. Moreover, the polluted river and lake restoration has been selected as a key evaluation indicator of achievements of the sponge city construction implemented since April 2015. This paper describes how to apply the sponge city construction technology to rehabilitate the polluted rivers and lakes through the polluted water treatment project in Xinghan New Area, Hanzhong and the polluted Huaguping River restoration project in Pingshan District, Shenzhen. The experience and lessons of the polluted river and lake restoration are summed up. Some measures to solve existing problems are put forward.

• 한국건축시공학회지
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• 제19권6호
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• pp.503-510
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• 2019

최근 RC 구조물의 건설기술에서는 콘크리트의 크리프에 대한 검토가 이루어져야 한다. 본 연구에서는 콘크리트의 크리프 예측 및 국내 건설현장의 크리프 결과에 영향을 미치는 요인을 검토했다. 크리프 테스트 기간이 길고 압축 강도가 높을수록 크리프 예측 정확도가 높아졌다. 경화 온도가 높을수록 콘크리트의 초기 강도가 높아지지만 크리프 계수의 차이는 시간이 지남에 따라 증가했다. 국내 건설현장 및 실험실에서의 크리프 평가 결과를 기반으로 ACI-209모델을 보완하는 수정 된 예측 모델을 제안했다. 일반~고강도 콘크리트를 사용한 실제 부재의 크리프 예측에서는 테스트 기간과 온도를 정확하게 고려해야한다.

• Wind and Structures
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• 제23권6호
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• pp.595-613
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• 2016

Large amplitude oscillation of steepled main cables usually presents during construction of a long-span bridge. To study this phenomenon, six typical main cables with different cross sections during construction are investigated. Two main foci have been conducted. Firstly, aerodynamic coefficients of a main cable are obtained and compared through simulation and wind tunnel test: (1) to ensure the simulation accuracy, influences of the numerical model's grid size, and the jaggy edges of main cable's cross section on main cable's aerodynamic coefficients are investigated; (2) aerodynamic coefficients of main cables at different wind attack angles are obtained based on the wind tunnel test in which the experimental model is made by rigid plastic using the 3D Printing Technology; (3) then numerical results are compared with wind tunnel test results, and they are in good agreement. Secondly, aerodynamic coefficients of the six main cables at different wind attack angles are obtained through numerical simulation. Then Den Hartog criterion is used to analyze the transverse galloping of main cables during construction. Results show all the six main cables may undergo galloping, which may be an important reason for the large amplitude oscillation of steepled main cables during construction. The flow structures around the main cables indicate that the characteristic of the airflow trajectory over a steepled main cable may play an important role in the galloping generation. Engineers should take some effective measures to control this harmful phenomenon due to the big possibility of the onset of galloping during the construction period.

• 한국건설관리학회논문집
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• 제7권5호
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• pp.77-84
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• 2006

지수는 여러 산업분야에서 오랜시간 동안 경제지표 또는 성과지표로서 중요한 역할을 담당해 왔으며, 실적공사비 적산방식이 적용 확대됨에 따라 2004년 2월부터 시간에 대한 보정을 위하여 건설공사비지수를 사용하고 있다. 건설공사비지수를 산출하기 위한 구성요소는 지수산정식과 자료원으로 구분된다. 기존의 건설관련 공사비지수에서는 물가지수산정에 사용하는 라스파이레스(Laspyeres)지수를 산정식으로 적용하고 산업연관표, 공사비 내역서를 사용하여 가중치를 산정하였다. 그러나, 기존의 방법은 물가변동이 중복 적용되고 대상프로젝트의 특성을 효과적으로 반영하지 못하는 문제점이 발생된다. 본 연구에서는 라스파이레스지수를 비롯한 기존 지수 산정식들을 분석하고, 공동주택공사의 사례를 통하여 기존 지수산정식 및 자료원의 적정성을 분석한 후, 건설공사의 특성을 효율적으로 반영하고 물가변동을 반영할 수 있는 새로운 지수를 제안한다.

• 한국건설관리학회논문집
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• 제18권3호
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• pp.22-32
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• 2017

과거 사례로 볼 때 건설시공사는 클레임 시스템이 없이 발주자에게 클레임을 제기하여 미 승인 또는 감액 등을 받아 손실을 입는 경우가 종종 발생하고 있어 기존의 클레임 프로세스 개선이 필요하다. 이를 개선하기 위하여 건설시공사는 클레임 프로세스 개선을 위하여 조직구성의 강화, 클레임 담당자에 대한 정확한 업무부여, 담당자에 대한 주기적 클레임 교육실시, 공기관리 및 공정관리 기법 개선과 철저한 문서관리가 필요하다. 또한 정기적인 클레임 회의가 필요하다. 본 연구에서는 발주자 잘못으로 인한 관급자재 조달의 지연, 구두 작업지시, 작업진행상 필요한 정보지연 및 과다 설계변경 등이 발생한 'A' 프로젝트에 대하여 개선된 프로세스를 적용하여 초기 공사기간 62개월에서 34개월의 공기연장을 받아 96개월에 완공하여 이를 입증하였다. 개선된 클레임 프로세스 시스템이 대규모 건설사업장은 물론 소규모 건설사업장에도 적용하여 도움이 될 것으로 기대한다.

• 건축역사연구
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• 제19권6호
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• pp.137-153
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• 2010

Jeongrimsaji as temple remains of Baekje Sabi period, its re-excavation has been carried three times in full scale. As a result, the buildings in left and right of lecture hall was largely identified in 3 forms. First, layout of small buildings in left and right of lecture hall. Second, layput of corridor in left and right of lecture hall. Third, layout of construction site in the north of corridor in left and right of lecture hall. Above second is included into remains of Gorye, the third is included into remains of Baekje - the remains were almost ruined then. The first form and third form in above is different each other in size of buildings, form of layout, and location. It is important to investigate these points: the time of constructing the buildings; what position have the use and function of the buildings in the temple? ; transition process of layout of the Buddhist temple. In this context, of temple remains in Baekje during the 5~7th century, the cases where construction sites in left and right of lecture hall and construction site in the north of corridor are identified, have been reviewed. Based on this review, the use and function of buildings, their transition process were investigated. The survey results show that small buildings in left and right of lecture hall existed in the middle and later period of the 6th century. During the later 6th century ~ the 7th century, construction site in narrow and long square shape was located in left and right of lecture hall instead of small buildings in the north of corridor. Therefore, it is identified that the aforementioned thing is earlier stage and the latter thing is later stage.