• 한국건축시공학회지
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• 제15권5호
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• pp.491-500
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• 2015

본 연구에서는 공동주택에서 건설 공사비 증가의 원인이 되는 하자에 대하여 건설업체의 공급자 중심이 아닌, 소비자가 법적인 하자보수 책임기간 만기를 앞두고 안전진단 전문기관에 의뢰하여 얻은 하자진단 결과보고서 자료를 근거로 공종별 하자실태를 조사하였다. 또한, 보수비용적 측면에서 세부요인을 분석하여, 시공단계에서의 품질향상과 하자분쟁 해결의 객관적이며 기초적인 자료를 제시하였다.

• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.226-230
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• 2013

In the tall building construction, the slab formwork largely impacts on construction cost. Because productivity of a slab formwork is influenced by a number of and the efficiency of equipment, using the equipment-based construction method, an appropriate equipment input planning is crucial for the productivity. Meanwhile, the general equipment input planning is conducted by intuition based on experience due to the lack of equipment productivity data. Thus, this study develop a simulation model to analyze table formwork productivity and to propose an optimum equipment input plan that reflects the construction process, based on the full consideration of the economic factors. This study developed a simulation model by using CYCLONE and the data for the model was collected by measuring the duration of each unit activity in the tall building where table forms were applied. It is expected that a simulation model helps users to make better decision on the equipment input planning of slab formwork.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.401-404
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• 2015

Demand on free-form buildings is gradually increasing, yet owing to the difficulty of production-installation work, several problems occur in the construction phase upon construction of a building, including the increased cost and construction duration, and reduced constructibility. To solve these problems, a techonology to produce FCP using a CNC(Computerized Numeric Control) machine is developed. The technology is that the information of designed free-form buildings to the CNC machine is transferred, and the transferred information is used for RTM(Rod-Type Mold, the mold shaped by back-up rods) and PCM(Phase Change Material) shaping, and the shaped RTM and PCM have the role of molds to produce FCP. Construction duration and project cost are limited in building sites, so the efficiency of processes like production-installation of FCP for application of the technology is significant. Since it is almost impossible to change the production-installation process at the construction phase when they are established, process should be deliberately decided. Therefore, the purpose of the study is to propose a production-installation simulation model of free-form concrete panels, in aspect of PCM. This paper is establishing the process for production-installation of FCP, estimating time required by each construction type and proposing a time simulation model that changes according to various constraints based on the analyses. With the time simulation model, it will be possible to build a cost model and to review the optimal construction duration and project cost.

• 한국건축시공학회지
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• 제12권4호
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• pp.401-414
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• 2012

The adoption of Green Frame is expected to provide economic benefits, since construction costs are reduced by the in-situ production of precast concrete column and beam. The cost reduction can ultimately be realized by saving transportation costs and the overhead and profit of PC plants. The cost structure of Green Frame, which is built up using composite precast concrete members, is similar to that of a bearing-wall structure, but the difference in construction process has resulted in some cost differences for a few items. In particular, production and installation is the principal work involved in Green Frame made by precast concrete members, while form and concrete work is the principal work for a bearing-wall structure. As such, the rental time and fee for a tower crane should be compared through time analysis. To verify reliability, this study focused on developed residential projects to estimate the construction costs. Through this analysis, it was found that the costs of Green Frame were 1.57% lower than the costs of bearing-wall structure. The results of this study will help in the development of a management plan for the structural work of Green Frame.

• 건축역사연구
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• 제6권2호
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• pp.65-77
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• 1997

The Hwasong City Wall was built for three years(1794-1796), but the real construction term was taken only 28 months. The wall and the buildings on the wall were built simultaneously, and the esttimated construction cost was highly restricted. These conditions were main factors for considering the high efficiency of construction productivity. This study examines these factors that are reflected in the operating system of the architectural standard scale of length, the architectural composition system in the Hwasong City Wall to reduce the construction cost. Through the study, following factors are found. 1.The rule of multiple proportion is found in the relationship between the partition distance, that is, span and the height of the girder which is related to the productivity of ready-made building members. 2.The ruling grade system of scale in the component members is found in the chang-bang(창방, penetration members)

• 한국건설관리학회논문집
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• 제22권3호
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• pp.69-78
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• 2021

추정공사비는 기본설계 이전단계에서 건설사업에 투입되어야 하는 적정 예산의 확보를 위해 산정되는 중요한 건설공사비 지표이다. 여러 공공기관에서는 추정공사비를 산정하기 위해 공공건축물 세부 유형별 단위면적당 공사비를 도출하고, 이를 해당 건축물의 연면적에 곱하는 방식을 사용하고 있다. 그러나 일부 공공건축물들은 그 시설물의 구성 및 조합이 다양하여 세부 유형별로 단위면적당 공사비를 산정하는 획일화된 현행 추정공사비 산정방법으로는 공공건축물 내 여러 시설물 조합에 따른 특성을 반영할 수 없어 신뢰성 있는 추정공사비를 산정하는데 한계성을 지니고 있는 것으로 조사 및 분석되었다. 본 연구의 목적은 발주 빈도수 및 누적사업비용의 규모가 크고 시설물의 구성 및 종류가 다양한 초·중·고등학교를 대상으로, 시설물 조합에 따른 추정공사비 산정방안을 제시하는 것이다. 본 연구에서 개발한 초·중·고등학교 시설물별 추정공사비 산정모델 및 분석 방법론을 실무에 적용할 경우 공공발주자는 보다 합리적이고도 신뢰성 있는 초·중·고등학교의 추정공사비 산정이 가능할 것으로 기대된다.

• Architectural research
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• 제16권2호
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• pp.75-80
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• 2014

Risks, uncertainties, and associated cost overruns are critical problems for construction projects. Cost contingency is an important funding source for these unforeseen events and is included in the base estimate to help perform financially successful projects. In order to predict more accurate contingency, many empirical models using regression analysis and artificial neural network method have been proposed and showed its viability to minimize prediction errors. However, categorical factors on contingency cannot have been treated and thus considered in these empirical models since those models are able to treat only numerical factors. This paper identified potential factors on contingency in transportation construction projects and evaluated categorical factors using the one-way ANOVA statistical method. Among factors including project work type, delivery method type, contract agreement type, bid award type, letting type, and geographical location, two factors of project work type and contract agreement type were found to be statistically important on allocating cost contingency.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1209-1215
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• 2009

Recently, Construction Projects are being much bigger and more complex. So the importance of Construction Planning and Management is increasing and increasing because of the Construction Projects is involved in a variety of construction-related subjects. Competitive of the Construction Industry decided Cost, Construction Duration and Productivity. But they were just focused on Cost Saving instead of Construction Duration and Productivity. However, they have to finish construction projects using minimum cost and duration with quality and function of required level for successful Construction projects. Thus, current high exchange rate and high period, it is clear to decrease construction cost and to do economic construction in huge Construction Projects and it means more advanced Construction Schedule Management needs for economic construction. But Construction Scheduling Planning, basic of Construction Schedule Management, adjusted contract period without Pre-Planning, just depending on experience and ability of Construction Engineer. Because of that, this study suggests new Duration Estimate Method using Stochastic Model in BIM Environment for advanced Construction Schedule Management. Existing Duration Estimate Methods are just modified wrong points of them or analyzed effective factors of construction schedule. However, New Duration Estimate Method is just consists of Stochastic Model and BIM Environment without existing Duration Estimate Methods. So, new method has creativity and specialty. After this research, it would be a great model in construction industry field.

• 한국건설관리학회논문집
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• 제20권3호
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• pp.31-38
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• 2019

본 연구의 주목적은 공동주택 설비 계획 단계에서 수행되는 업무들을 파악하고 성과지표에 영향을 줄 수 있는 주요 계획업무를 분석하여 프로젝트의 성과에 미치는 영향을 분석하는데 있다. 계획업무의 성과지표에 대한 영향 분석을 위하여 설비공사의 계획업무를 크게 5개의 주요업무로 구분하고 각각을 공정계획(P1~P6), 시공계획(C1~C5), 환경관리계획(E1~E4), 품질관리계획(Q1~Q5), 안전관리계획(S1~S5)으로 명명하고, 각각의 주요 업무를 세분화 시켜 총 25개의 세부 계획업무로 분류하여 원가에 대한 영향을 분석하기 위해 independent t-test를 실시하였다. 각각의 주요 업무를 세분화 시켜 총 25개의 세부 계획업무로 분류하여 원가에 대한 영향을 분석하기 위해 independent t-test를 실시하였다. 프로젝트 목표 달성에 따른 중요도를 비교하여 유의도 0.05 이하에 대해 원가뿐만 아니라 공기의 성과지표에 공통적으로 영향을 미치는 구체적인 중요 공사의 계획업무를 파악하였다.

• 한국건축시공학회지
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• 제21권2호
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• pp.105-112
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• 2021

국내 해체시장 규모는 꾸준히 증가되고 있는 반면, 해체공사비 예측 연구는 미흡한 실정이다. 이에 본 연구에서는 해체공사비 변동에 영향을 미치는 다양한 속성을 반영한 공사비 예측 모델을 제시하고자 하였다. 이를 위하여 기존 문헌고찰과 전문가 자문을 바탕으로 13개의 영향요인과 실적공사비 데이터를 수집하였으며, 회귀분석을 통해 2개의 예측모델을 구축하고 예측정확도를 평가하였다. 그 결과, 약 6~12%의 평균 오차율을 보였으며, 예측 모델로서의 활용 가능성을 모색할 수 있었다. 본 연구 결과는 향후 국내 해체공사의 적정 공사비산정 및 관련 기준 정비에 기여할 수 있을 것이다.