• Korean Journal of Construction Engineering and Management
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• v.22 no.6
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• pp.107-119
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• 2021

Recently, interest in remodeling apartment houses has been increasing due to problems such as a lack of parking spaces for old apartment houses. However, no method was suggested to predict the construction period of the apartment remodeling project. Unlike general apartment new construction, apartment remodeling construction involves demolition or reinforcement work, so a realistic remodeling construction period calculation plan differentiated from the existing construction period should be proposed. Therefore, this study intends to present a model for deriving the construction period of the underground parking lot of the apartment remodeling construction. Each construction period was calculated based on 19 activities of underground parking lot remodeling work through review of previous studies and expert advice. Activity's workload data and productivity data were derived to calculate the construction period, and the number of inputs and equipment inputs by Activity were determined to correct the productivity data. The construction period of Activity was calculated using the derived data, and the criteria for calculating the overlapping period for each Activity were presented to enable realistic construction period and scheduled schedule. As a result of predicting the accuracy of the construction period through the verification of the case complex, it is expected that it will be possible to predict the approximate construction period of the underground parking lot of the apartment remodeling construction in the future.

• Korean Journal of Construction Engineering and Management
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• v.6 no.6 s.28
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• pp.142-151
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• 2005

On public constructions, that the first planed projects delay than the scheduled completion day occurrence frequently because gap between the scheduled construction durations and the actual construction durations. These facts connect with not only problems of the construction during as the construction delay but also brought about the distribution costs increase as the failure of facility use plan and the people discomfort weight, failure of the production and the supply using facility then tremendous loss of each part etc. For reduce these loss, it must improve accuracy of the scheduled construction duration estimating when it order. This study try contribute to a successful manage of public project and reduce the construction duration extension frequent of the construction during, and then ensure the suitable construction duration by present the estimation model of the scheduled construction duration that include the construction duration correct element using as an index on the scheduled construction duration estimation.

• The Journal of Sustainable Design and Educational Environment Research
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• v.22 no.1
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• pp.13-27
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• 2023

This study analyzed the reasons for extending the construction period considering factors such as the quality of construction materials, safety and cost-effectiveness of construction, size of construction, academic schedule, and local conditions (complaints) when determining the appropriate period for school construction projects tailored to a specific region or educational office. Based on the example of construction projects for school facility improvement by education office A, this study conducted a case study to identify the motives for construction period extension. To determine the appropriate construction period for school facilities, this study conducted a comprehensive review of construction projects under the jurisdiction of education office A, examined data from the Meteorological Data Open Portal, and performed advanced statistical analysis. Future case studies must determine the appropriate construction period for school facilities in a rational and systematics.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.6
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• pp.821-830
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• 2023

Various studies has tried to unveil causes of cost overrun and schedule delay in the road construction project. However, these causes need standardization due to difference by guidelines, relevant research, and facilities. Therefore, this study identifies and elaborate standard road construction cost and schedule variation factors that can be used in the planning and execution of the project. variation factors have been derived and grouped through literature review and modified and supplemented through expert interview. In addition, the connection with the relevant guidance factors is confirmed and the usability is reviewed by applying actual road construction cases. The factors suggested in this study comprehensively include factors of related guidelines and previous research, more clearly distinguish, support decision making.

• 월간 기계설비
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• no.10 s.183
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• pp.31-33
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• 2005

기계설비공사의 하자담보책임기간은 <건설산업기본법시행령 제30조 관련 별표 4>, <국가를 당사자로 하는 계약에 관한 법 시행규칙 제70조 관련 별표 1> 및 <주택법시행령 제59조 제1항 관련 별표 6>에 의하여 2년 이내로 규정되어 있다. 그러나, 일부 발주기관 및 건설업체에서 기계설비공사의 하자담보책임기간을 법으로 정한 기간을 초과 설정하여 하자보수 비용 및 하자보증수수료 증가 등의 민원이 발생되고 있어, 건설교통부 및 재정경제부는 하자담보책임기간을 법으로 정한 기간을 준수하여 줄 것을 발주기관에 협조 요청한 바 있다. 이와 관련 대한설비건설협회에서는 기계설비공사 하자담보책임기간을 법으로 정한 기간을 정하여 줄 것을, 시공능력 300위 이내의 일반건설업체 대표이사와 하도급계약담당 부서장에게 요청하였다. 또한 계약 체결한 기계설비공사의 하자담보책임기간이 법으로 정한 기간을 상회하는 경우에는 회계통첩에 의하여 계약서상의 기간을 조정하여 하도급계약시에는 법으로 정한 하자담보책임기간을 설정하여 줄 것을 요청하였다.

• Korean Journal of Construction Engineering and Management
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• v.7 no.1 s.29
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• pp.138-147
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• 2006

Construction companies have been interested in the construction duration which importantly affects the performance and the success of the construction projects in accordance with the systemic changes such as five days per week system, introduction of construction duration reduction bidding system and post sale system nowadays. It is also very important to estimate and forecast properly the construction duration as the construction companies compete for the projects in the situation of construction market reduction and the lowest bidding system. Recognizing the importance about the construction duration, the researches about comparing and analyzing or estiamting the construction duration have been performed. However, comparing studies about the construction duraion have been limited to the apartment and office building in domestic area. Many studies about forecasting construction duration have been performed through stochastic analysis and simulations. Little research has been addressed the comparison analysis of the real construction duration about the mix-use building and officetel building which occured according to the changes of the building requirements. Therefore, the objective of this study is to compare and analyze the real construction duration and the hypothetical construction duration about the mix-use building and officetel building of the domestic companies. Moreover, we select the most competitve construction company to get the strengths and analyze the competitive advatages of the construction companies about construction duration.

• Journal of the Korea Institute of Building Construction
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• v.11 no.2
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• pp.100-107
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• 2011

As construction duration significantly influences the performance and the success of construction projects, it is necessary to appropriately manage the impact factors affecting construction duration. Recently, interest in the construction industry has been rising due to the recent change in the construction legal system, and the competition among the construction companies on construction time. However, the impact factors are extremely diverse. The existing productivity data on impact factors is not sufficient to properly identify the impact factor and measure the productivity from various perspectives, such as subcontractor, time, crew, work and so on. In this respect, a multidimensional analysis by a data warehouse is very helpful in order to view the manner in which productivity is affected by impact factors from various perspectives. Therefore, this research proposes a method that effectively takes the diverse productivity data of impact factors, and generates a multidimensional analysis. Decision tree analysis, a data mining technique, is also applied in this research in order to supply construction managers with appropriate productivity data on impact factors during the construction management process.

• Journal of the Korea Institute of Building Construction
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• v.17 no.6
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• pp.577-585
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• 2017

HPC method is developing to improve the constructability and structural performance of the existing PC method. The objective of this study is to develop construction procedures and to analysis of construction period for HPC method. In order to develop construction procedures, the building construction data of the existing half-slab method was analyzed. Analyzing design drawings and specifications of nine construction cases, a prototype of half-slab method, was drawn. Applying the core technology of HPC method to the drawn prototype of half-slab method, a prototype of HPC method, was developed. The differences of both methods were 'installing PC column' and 'placing topping concrete'. To analysis the differences of both methods, seven construction cases were analyzed. According to the analysis for HPC method, cases1 and 2 had columns divided for construction shortened about 16% of a construction period. The schedule of column assembly work was analyzed to be shortened much. That is judged to be because the use of a hollow PC column leads to a decrease in the number of columns. In particular, if HPC method is applied to a building construction site using large columns, it is analyzed to shorten a construction period more than the existing Half-slab method.

• Korean Journal of Construction Engineering and Management
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• v.22 no.3
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• pp.12-20
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• 2021

In order to secure construction quality and safety and prevent cost disputes, the importance of calculating 'the appropriate construction period' has recently emerged. It is necessary to analyze a considerable amount of historical data to establish the standard for calculating the construction period. However, many experts are raising questions about the use of past data due to changes in the construction business environment, such as shortening working hours, reinforcing quality regulations, and changing climate conditions. In addition, the possibility of errors increases when calculating a uniform construction period using historical statistics because the work order and productivity are very diverse according to construction conditions. Therefore, through this study, a new solution to change from the method of analyzing past data to the method of reviewing current production data through an active 'transformation of thoughts' was proposed through this study. In other words, the process of reviewing and calculating 'the appropriate construction period' was institutionalized by introducing 'process management experts' and 'construction experts by type of construction' in the design stage.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2023.11a
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• pp.97-98
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• 2023

본 연구에서는 건설현장 관계자들을 대상으로 위험인식이 작업환경과 안전문화에 미치는 영향관계를 확인하였다. 또한, 안전관리활동과 공사기간이 안전문화에 미치는 영향을 분석하였다. 주요 결과는 다음과 같다. 첫째, 위험인식은 작업환경에 영향을 미치는 것으로 나타났으며, 둘째, 작업환경은 안전문화에 영향을 미치지 않았다. 셋째, 안전관리 활동은 안전문화에 영향을 미치지 않았으며, 넷째, 공사기간은 안전문화에 영향을 미치는 것으로 분석되었다. 또한, 안전관리 활동과 위험인식 간의 상관관계는 r=.61로, 위험인식과 공사기간은 r=.71로 안전관리 활동과 공사기간의 상관관계는 r=.59로 관계의 강도를 확인하였다.