• Korean Journal of Construction Engineering and Management
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• v.8 no.2
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• pp.75-83
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• 2007

Recently, the Design-Build (DB) delivery method in public sector makes some argument by reason of the initial cost which is more higher than those of Design-Bid-Build (DBB). According to the results of pervious researches related to the performance evaluation of delivery method, DB can lead the reduction of project cycle time and also is superior to the traditional DBB in terms of construction quality. The performance on each delivery method could be generally evaluated by a project cost and a project cycle time as one of quantitative analyses, and also by construction quality as one of qualitative analyses. In most researches, the evaluation of performance level based on delivery methods has been evaluated by the degree of their satisfaction through the interview with owners. Therefore, this paper analyzed the design documents of construction projects delivered by traditional DBB and DB in bridge construction projects in order to measure design quality, constructability, maintainability, and etc. As an above-mentioned analyses, finally, this research shown that how much the difference of performance level is by each delivery method.

• The Safety technology
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• no.104
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• pp.65-69
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• 2006

• Journal of the Computational Structural Engineering Institute of Korea
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• v.36 no.2
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• pp.85-92
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• 2023

Unlike a completed building, a building under construction may be at risk in terms of safety if a load exceeds the value considered in the design stage owing to various factors, such as a load action different from that in the design stage and insufficient concrete strength. In addition, if an earthquake occurs in a building under construction, greater damage may occur. Therefore, this study studied example models with various sizes of 5, 15, 25, and 60 floors for typical building types and analyzed the effects of seismic load on buildings under construction using construction-stage models according to frame completeness. Because the construction period of the building is much shorter than the period of use after completion, applying same earthquake loads as the design stage to buildings under construction may be excessive. Therefore, earthquakes with a return period of 50 to 2,400 years were applied to the construction stage model to review the seismic loads and analyze the structural performances of the members. Thus, we reviewed whether a load exceeding that of the design stage was applied and the return period level of the earthquake that could ensure structural safety. In addition, assuming the construction period of each example model, the earthquake return period according to the construction period was selected, and the design appropriateness with the selected return period was checked.

• Journal of the Korea Institute of Building Construction
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• v.17 no.1
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• pp.83-90
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• 2017

Recently, BIM has been actively adopted in construction projects and industries, and also integrated with Information and Communications Technology(ICT) such as cloud computing technology, sensor technology, 3D scanning and printing technology etc. However, it is very difficult to efficiently utilize BIM services, technologies and collaborate with each other because of differences of usage and requirements of technologies. Every participant in the same construction project has their own needs, requirements and details of the model in each phase. In order to enhance utilization BIM model, BIM services and technologies required in their project have to be clearly defined in the initial stage of the project. In order to support the owner to define the BIM level, BIM service level and application technologies are identified and guidelines how to define the level and technologies for their project purpose are suggested in this study.

• Journal of the Korea Institute of Building Construction
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• v.17 no.6
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• pp.567-576
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• 2017

The purpose of this study is to analyze safety perception level of workers in construction site according to NOSACQ-50. To achieve the objective of this study, First, literature review is conducted to clearly define the concept of safety climate. Second, NOSACQ-50 is used to survey the level of safety climate of workers. Third, statistical analysis based on collected data is conducted to examine the level of safety climate. As a result, the level of safety climate in South Korea was found to be serious comparing with the standard value proposed in NOSACQ-50. Finally, the improvements were suggested after investigating the key factors on the level of safety climate. In the future, this study will be used as a baseline for developing safety awareness assessment tools such as NOSACQ-50 for domestic construction sites.

• Explosives and Blasting
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• v.30 no.2
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• pp.59-65
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• 2012

This study improved constructability and cost efficiency that are disadvantages of existing a mechanical excavation & similar blasting methods(plasma, gel, etc) and introduced cases of development and practical applications of Low vibration explosives(LoVEX) that minimizes blast vibration. The low vibration explosives(LoVEX) is suitable to Type-1 in standard blasting patterns of Ministry of Land, Transport and Maritime Affairs(MLTM) and delay blasting is possible. Moreover, the low vibration explosives improve construction and work efficiency while the level of vibration is reduced to about 60~70% of normal emulsion explosives. Additionally, this study suggested standard blasting patterns, the prediction equation of blasting vibration, and construction methods.

• Explosives and Blasting
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• v.28 no.1
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• pp.11-18
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• 2010

This study improved construction and cost efficiency that are disadvantages of existing low vibration crackers(low vibration cracker, plasma, etc) and introduced cases of development and practical applications of Low vibration explosives(NewFINECKER) that minimizes blast vibration. The low vibration explosives(NewFINECKER) is suitable to Type-1 among standard blasting patterns of Ministry of Land, Transport and Maritime Affairs(MLTM) and delay blasting is possible. Moreover, the low vibration explosives improve construction and work efficiency while the level of vibration is shown to be about 60~70% of normal emulsion explosives. Additionally, this study suggested standard blasting patterns, the prediction equation of blasting vibration, and construction methods.

• Magazine of the Korea Concrete Institute
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• v.14 no.2
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• pp.52-60
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• 2002

지하철 구조물과 같은 매스 콘크리트 구조물을 시공할 때 온도 측정을 하는 경우는 많으나 이는 내외부 온도차를 적정한 수준으로 유지하여 균열 발생을 제어하기 위한 수단일 뿐 균열폭을 일정한도 내로 제어할 수 있는 조치는 아니다. 매스 콘크리트 구조물에서 균열폭을 제한 값 이하로 하기 위해서는 적절한 양의 철근을 배치하여야 한다. 또한 시공 이음 등을 작은 간격으로 설치하는 것은 구속도를 완화시키고 온도응력이나 균열폭을 저감시켜 균열 제어상 매우 효과적인 수단이 될 수 있다. 그러나 시공 이음, 균열 유발 줄눈 등의 이음간 간격을 좁히면 내하력 수밀성, 내구성 등에 악영향을 미칠 가능성이 높고, 타설 회수가 많아져 동일한 공정이 반복 투입되므로 시공 속도의 저하 및 공사비 상승 등의 단점이 나타날 수 있다.(중략)

• 월간 기계설비
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• s.301
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• pp.62-70
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• 2015

사우디아라비아에서는 한국인들을 부지런하고 성실하며 기술력을 갖춘 엘리트민족이라고 부른다. 그들이 이렇게 생각하는 이유는 1970년대 중동진출 붐이 일면서 우리나라 건설업체들이 숨쉬기 거북할 정도로 뜨겁고 건조한 열사의 사우디아라비아에서 몸사리지 않고 성실한 시공을 했기 때문이다. 또한 사우디에서 주목하는 중요한 공사들을 한국 건설사들이 대부분 성공적으로 수행했을 뿐만 아니라 88서울올림픽, 2002년 한일월드컵 등으로 한국을 보는 시각이 많이 달라졌기 때문이다. 과거 70년대 중동진출 초기 한국 기업들로 이뤄진 컨소시엄에 미국 유럽계 기업이 없다고 퇴짜를 놓았던 사우디 정부는 최근들어 한국기업이 시공 뿐 아니라 주요 자재공급까지도 맡는 수준이 되자 한국기업과 한국인을 대하는 태도가 달라진 것이다. 한화건설과 기계설비 시공업체인 (주)정풍개발(대표 김성언)은 사우디아라비아 얀부지역에서 사우디아라비아인들의 삶의 질 향상을 위해 발전시설 및 담수화플랜트 시공을 하고 있다.

• Electric Engineers Magazine
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• s.282
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• pp.24-29
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• 2006

인텔리전트 빙딜은 건물의 특성상 거주자의 안전과 편의를 최우선적으로 고려해야 하는 첨단 복합빌딩이다. 미 목적을 구체화하기 위한 인텔리전트 빌딩은 빌딩자동화 시스템, 정보통신시스템, 사무자동화 시스템, 시스템 통합3부분으로 나누어서 고찰 할 수 있겠다.이 3가지 시스템의 어느 한 부분이라도 기능을 제대로 발휘하지 못하면 인텔리전트 빌딩으로서 기능을 유지하지 못하므로 이 3가지 부분이 완벽하게 설계, 시공되어 체계적으로 유지관리 될 때 인텔리전트 빌딩으로서의 기능을 발휘하게 된다. 시스템일부의 지장은 시스템 전체에 영향을 미치기 때문에 무엇보다도 시공 품질에 대해서는 일반 빌딩에 비하여 높은 수준을 필요로 함과 동시에 시공의 신뢰도 향상도 요구된다. 특히 시스템의 개획, 즉 설계단계에서 시스템 품질이 대부분 결정되므로 설계단계에서의 충분한 검토가 필요하다. 이장에서는 인텔리전트 빌딩 시스템 (Intelligent building System)의 개념을 알아보고, IBS 건물에 있어 중요한 전원설비의 최적화 방안에 대해 자동제어 설계 및 시공의 입장에서 고찰해 보려한다.