• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 가을학술발표대회논문집
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• pp.49-50
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• 2023

Asbestos is a building material that has been actively used because of its excellent durability and heat resistance until 2009, when it was found to be a first-class carcinogen and prohibited in Korea. Currently, asbestos dismantling is an essential process in demolition of old buildings. Workers are likely to be exposed to asbestos in the process of dismantling and removing them, which causes various occupational diseases, suggesting related laws and work standards to ensure the safety of asbestos dismantling process. Accordingly, prior studies have been conducted to analyze the level of asbestos exposure and influencing factors occurring during work, but most of them are mainly concerning health issue while research on process risks considering field characteristics and safety aspects of the work processes is still insufficient. Therefore, this study aims to derive the process risks affecting the safety of workers based on the survey results of asbestos dismantling companies, and further proposed a cost calculation model taking those risks into account.

• 토지주택연구
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• 제4권3호
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• pp.211-223
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• 2013

Massive migration is underway in rapidly urbanizing Guangzhou, the south gate of P. R. China. Over half the migrants choose to rent in "villages-in-the-city" in the downtown area because of the low-cost and prime location. The overpopulation and resulting poor environment and high crime-rate turn villages-in-the-city into de facto ghettos. As a result, these ghettos are undergoing a manner of demolition-development, leaving migrants' housing needs unmet. A private-sector initiative-the Tulou Commune-intends to address this considerable market potential. Targeting low-income groups, the Tulou Commune creates a socio-spatially exclusionary enclave. This paper analyzes the Tulou Commune and the implications if more low-income migrants shifting from village-in-the-city (excluded ghetto) to Tulou Commune (exclusionary enclave). This study argues that the intervention of the private sector causes the demographic, social, and spatial similarities and differences of the two living arrangements. Socioeconomic and institutional factors also affect the initiative. This study also provides more empirical evidence in the field of low-cost housing and socio-spatial development in transitional Chinese cities. As the first project of its kind, the analysis of the case can suggest how to improve strategies for accommodating migrants in the future.

• Structural Engineering and Mechanics
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• 제82권5호
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• pp.557-569
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• 2022

The retrofit of existing structures in high seismic zones is a crucial issue in the earthquake engineering field. The interest of the research community is particularly high for the structures that do not respect current seismic codes and present structural deficiencies such as poor detailing and lack of capacity design provisions. A reinforced concrete (RC) school building is used as case study to show the influence of different knowledge levels on the seismic retrofitting cost assessment. The safety assessment of the case study building highlights deficiencies under both vertical and seismic loads. By considering all the possible knowledge levels defined by the Italian such as by the European codes in order to derive the mechanical properties of the school building constitutive materials, the retrofit operations are designed to achieve different seismic safety thresholds. The retrofit structural costs are calculated and summed up to the costs for in-situ in tests. The paper shows how for the case study building the major costs spent for a large number of in-situ tests allows to save a consistent amount of money for retrofit operations. The hypothesis of demolition and reconstruction of the building is also compared in terms of costs with all the analyzed retrofit options.

• 한국건설관리학회논문집
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• 제15권6호
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• pp.63-70
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• 2014

건설폐기물의 재활용과 재사용 비율을 높이기 위해서는 건축물의 분별해체 공법이 적용되어야 한다. 본 연구에서는 공동주택을 대상으로 시험시공을 실시하였다. 먼저 해체 과정에서 발생할 수 있는 모든 건설페기물을 건물의 각 부위별로 조사하였다. 해체대상 건물의 도면을 작성하고 이 도면을 분석하여 각 건설페기물의 발생량을 예측하였다. 공동주택의 한 빌딩씩 분별해체와 일반해체과정을 실시하면서 이 과정에 투입되는 인력 및 장비의 소요시간을 측정하고, 또한 각 해체과정에서 발생된 폐기물을 정밀 계측하여 이것의 체적, 단위중량 등을 제시하였다. 이러한 자료의 분석을 통해 도면분석 결과와 현장에서 발생된 건설페기물의 양을 비교분석하여 현장 회수율, 체적 및 중량 환산계수, 폐기물 원단위를 제안하였다. 이러한 계수는 건설페기물의 발생량 예측과 운반비 산정, 작업 공정계획 수립 등을 위한 기초적 자료로서 활용될 수 있을 것이다.

• 한국건설관리학회논문집
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• 제23권3호
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• pp.66-73
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• 2022

물산업 우수제품 지정제도는 우수제품의 기술규격을 만족하는 물산업 우수제품을 사용자가 우선 구매토록 유도하여 국내 물기업의 기술개발 촉진 및 시장 활성화를 통한 물산업 선순환 구조 조성을 목적으로 한다. 본 연구에서는 2가지 용량의 펌프를 대상으로 물산업 우수제품으로 지정된 제품과 일반제품의 비용측면의 장점에 대한 객관적인 근거를 사용자에게 제시하고자 하였다. 비용측면의 장점에 대한 분석방법으로 생애주기비용 분석(Life Cycle Cost; LCC)을 통한 경제성 평가를 실시하였고, LCC에 필요한 각종 자료를 조사하였다. 조사한 항목으로는 초기투자비용(펌프 구매비용, 설치비용), 운영비용(에너지비용, 유지관리비용) 및 철거비용(폐기 비용, 잔존가치)이다. 2가지 용량의 우수제품과 일반제품을 비교한 결과, 1,860m³/h 용량(이하 대용량)에서 15년의 운영기간동안 우수제품의 생애주기 비용이 대략 212백만원 정도 적게 소요될 것으로 예측되었으며, 360m³/h 용량에서는 우수제품의 생애주기 비용이 17백만원 정도 적게 소요될 것으로 예측되었다. 또한, 대용량 펌프의 우수제품에 대하여 민감도 분석을 추가로 실시하여 펌프 생산 시 제품의 생애주기 비용을 절감하기 위해 고려해야 할 사항을 살펴보았다. 그 결과 펌프의 효율 향상과 소모품의 교체주기를 증가시키는 방향으로 제품을 개발하는 경우, LCC에 미치는 효과가 클 것으로 예측되었다.

• Advances in concrete construction
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• 제5권4호
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• pp.303-311
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• 2017

The concrete industry of developing countries like India consumes majority of natural resources. The increase in population has necessitated the construction of more and more structures. Further many structures have completed their life span or have undergone damages thus warranting the demolition of these structures. India produces approximately 23.75 million tons of recycled concrete aggregate (RCA) annually. The natural resources are depleting at a higher rate with the increasing demand of concrete industry. This difficulty can be reduced with the use of RCA in land fill and concrete manufacturing. Use of RCA can provide cost savings and better energy utilization. This paper presents mechanical behavior of concrete comprising successively recycled concrete aggregate. Mechanical properties of recycled concrete get affected with number of recycling. In mix design successive recycled concrete aggregate (SRCA) was used in place of natural aggregates (NA) with 100% replacement. The test results of the compressive, flexural strength and pulse velocity were obtained for 14 and 28 days of curing age which showed significant improvement in results.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 1부
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• pp.119-120
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• 2011

Dome structure to form a space-efficient, applied a lot of beautiful buildings with structural systems, as well as a large space structure in the form of new residential lots have been applied. And domestic demand for housing in the dome with increasing dome house using various materials, are becoming commonplace. But now the Dome House is mainly used in construction steel, wood, stone, FRP construction and building materials per unit area and the high cost, long construction time, energy efficiency, has some disadvantages such as degradation. And structural strength of the structure is weak, the natural ingredients used come from natural damage is so big. In addition, demolition of buildings in trouble when handling the environmental problems has emerged. Recently expanded polystyrene to improve these problems by using the various approaches and research is being attempted and there.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.157-158
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• 2023

Building Information Modeling (BIM) design has been mandatory in Korea since 2016, and it has been gradually expanding in the industry, with a slow attempt to apply it in remodeling constructions. This is because Korea is facing a situation where many buildings are over 30 years old and require remodeling or reconstruction. The remodeling industry is also a growing market, as it saves construction time and cost compared to reconstruction. BIM is an ideal technology element for a competitive remodeling construction, as remodeling constructions face a complicated construction process from the start, including demolition, maintenance, and reinforcement to save the change process. However, there are still limitations in applying BIM to remodeling constructions, due to considerations of the existing building and the complicated requests of the inhabitants. BIM still has technical and environmental limitations for general use. In this study, I analyzed BIM application cases from existing studies and suggest what improvement points should be strengthened.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.211-212
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• 2023

Building Information Modeling (BIM) design has been mandatory in Korea since 2016, and it has been gradually expanding in the industry, with a slow attempt to apply it in remodeling constructions. This is because Korea is facing a situation where many buildings are over 30 years old and require remodeling or reconstruction. The remodeling industry is also a growing market, as it saves construction time and cost compared to reconstruction. BIM is an ideal technology element for a competitive remodeling construction, as remodeling constructions face a complicated construction process from the start, including demolition, maintenance, and reinforcement to save the change process. However, there are still limitations in applying BIM to remodeling constructions, due to considerations of the existing building and the complicated requests of the inhabitants. BIM still has technical and environmental limitations for general use. In this study, I analyzed BIM application cases from existing studies and suggest what improvement points should be strengthened.

• 한국산학기술학회논문지
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• 제17권9호
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• pp.533-542
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• 2016

교량의 유지관리 비용은 교량 건설 후 주기적으로 발생하게 되며 교량의 상태, 환경 조건 등 여러 요인들이 복합적으로 고려되어야 한다. 개축은 유지관리 단계에서 발생하는 조치 중 가장 최종적이며 대규모 비용이 투입되는 조치로서 교량 유지관리 의사 결정 지원을 위해서는 기본적인 개축 비용 산정 모델의 수립이 필수적이다. 본 연구에서는 교량의 개축 비용 산정을 위한 회귀 모델을 개발하였다. 이를 위해 교량관리시스템(Bridge Management System) 데이터베이스(database) 상의 교량 기본 제원을 분석하여 교량 형식별, 구성 요소별 대표 표본과 주요 영향 인자들을 정의하였다. 각 표본별 비용 산정변수를 고려하여 내역 작업을 수행하였다. 비용 산정 변수에 따른 대표 표본의 적산 결과를 회귀분석하여 상부구조, 하부구조, 기초 등의 신설 비용과 가교 설치 비용, 해체 폐기 비용에 대한 비용 모델을 도출하였다. 개발된 비용 모델을 활용하여 공용 중인 교량 형식별 개축 비용을 도출하고 단가를 산출하여 기존 문헌과의 비교 검토를 수행하였으며, 유지관리 의사결정에 효과적으로 활용될 것으로 기대된다.