비정형구조의 3차원 좌표제어를 위한 CNC Twisted Tube 공법 적용-대구 대표물문화관(The ARC)를 중심으로-

류한국,김성진 한국건축시공학회 2013 한국건축시공학회지 Vol.13 No.5

Generally, the envelope of a freeform building is composed of a structure made with rectangular or C-shaped steel pipe, and steel or aluminum panel finishes on the structure. However, these construction methods increase material loss and cost and time. There are also numerous cases of misunderstanding of design and difficulties in construction, which frequently cause construction errors. Such construction errors decrease construction productivity, resulting in poor construction quality and the need for rework, as well as cost and time overruns. To solve the problem, this study proposes a 3D coordinate control technology for freeform structure implemented through a CNC(Computerized Numerical Control) Twisted tube method, and by extension, develops a BIM-based envelope construction method for freeform building. 최근 건축은 정형의 건축물의 외관과 설계 범위를 벗어난비정형의 설계, 시각화, 3차원 모델 구현이 이루어지고 있다. 일반 정형건축물과는 달리 비정형건축물의 지붕과 외벽은 디자인 중심의 외벽시스템과 배수, 방수의 성능을 지닌지붕마감시스템으로 설계되고 시공되었다. 그러나 비정형건축물은 외벽과 지붕의 구분이 없어지고 외피로의 개념으로 통합된다. 또한 건축설계의 디자인 트렌드가 정형에서비정형의 자유로운 형태로 급변하고 있어 각종 현상설계 및턴키 등 설계경기의 당선을 위하여 비정형의 건축물이 자주등장하고 있다. 기존 비정형 건축구조물의 곡면외피를 시공하기 위해서는스틸 각파이프나 C형강으로 비정형 형태를 만들고 거기에외장을 시공한다. 그러나 이는 공사 기간 지연과 높은 공사비용이 소요되는 문제점이 있다. 제작, 설치, 검측 후 비정형 패널의 부착 오류, 줄눈의 불일치, 곡면의 직선 시공 등의 오류가 매우 빈번히 발생하고 있다. 이에 본 연구는 3차원 좌표제어 기술의 하나인 CNC Twisted Tube 공법을 적용한 구조체의 시공과정을 면밀히검토하여 3차원 좌표제어 기술로 비정형 건축물의 구현 방안을 제시한다.

선형 공정계획 모델의 액티비티 관계의 경계조건 분석

류한국,김태희,Ryu, Han-Guk,Kim, Tae-Hui 한국건설관리학회 2011 한국건설관리학회 논문집 Vol.12 No.1

Domestic leading construction companies has been establishing and performing TACT scheduling method, similar to linear scheduling model such as line of balance and repetitive schedule, and etc. in which repetitive construction works are involved like high-rise building. Linear scheduling model has been researched as a visual scheduling method presenting the work space and time information. Likewise scheduling constraints of CPM network such as finish-to-finish, start-to-start, finish-to-start, start-to-start, linear scheduling model also has the relationships constraints, namely boundary conditions, between activities. It is especially necessary to define the boundary conditions of the activities' relationships in order to apply the linear scheduling model to be compatible with the network schedule. Therefore, this research considers the boundary conditions between activities for establishing the linear scheduling model. This paper also applies the proposed boundary conditions to TACT schedule and then deduces the main considerations in order to establish and perform TACT schedule.

스마트 기기의 증강현실을 이용한 타워크레인 선정방안

류한국,최희복,장명훈 한국건축시공학회 2014 한국건축시공학회지 Vol.14 No.5

Appropriate selection of lifting equipments for a high-rise building construction project is one of the importantfactors to the project’s success. Proper position of a tower crane on a construction site is so important to be determinedby an expert or an experienced construction manager who draws working range of a tower crane and moves it over2D(dimensional) site layout plan. 3D CAD, BIM, and virtual reality are is used for building design and construction, butit is not usual to use them for temporary facility planning or selection of a tower crane. This study proposes a suitablemethod to use augmented reality to select proper position of tower cranes. An augmented reality prototype isimplemented by Vuforia and Unity 3D on a smart device to verify the practicability of the proposed method. Theprototype application installed on a smart device shows several tower cranes on different markers in a real architecturaldrawing to locate the proper tower crane. 고층건축공사의 양중장비의 선정은 프로젝트 성공의 중요한 요소 중의 하나이다. 건설현장에서는 전문가나 경험이많은 공사관리자가 2차원 도면 위에 타워크레인의 회전반경을 고려하여 위치를 이동시키는 방법을 통해 적절한 위치를 결정한다. CAD와 BIM, 가상현실 등이 건축설계와 시공단계에 많이 활용되고 있지만 가설계획이나 타워크레인을선정하기 위해서는 사용되지 않고 있다. 이 연구는 적절한타워크레인의 위치를 선정하기 위해 증강현실 기술을 이용하는 방법을 제안하고 있다. Vuforia와 Unity 3d를 이용하여 타워크레인의 위치를 선정할 수 있는 증강현실 프로토타입을 구현하였으며 실제 건축도면을 통해 활용성을 검증하였다.

건설사별 공기비교를 통한 공기경쟁력 분석 - 주상복합 및 오피스텔 건물을 중심으로 -

류한국,김선국,이현수,Ryu, Han-Guk,Kim, Sun-Kuk,Lee, Hyun-Soo 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.1

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.

공사기간 영향요인에 따른 생산성의 OLAP 분석과 의사결정트리 분석

류한국 한국건축시공학회 2011 한국건축시공학회지 Vol.11 No.2

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. 건설공사의 공사기간은 건설프로젝트의 성공적인 완수를 위하여 중요한 부분을 차지하기 때문에 공사기간에 영향을 미치는 요인들을 체계적으로 관리하는 것이 필요하다. 최근에는 건설 제도적 변화로 건설공사의 공사기간에 대한 관심이 증대되고 있다. 그러나 건설 프로젝트의 공사기간에 미치는 영향요인은 매우 다양하며, 각 요인들 중 어떤 요인이 어느 정도 작업의 생산성에 영향을 미치는지에 대한 데이터의 체계적인 활용이 부족하다. 또한 특정 프로젝트, 특정 작업, 특정 협력업체 등에 영향을 미치는 요인이 무엇인지 또는 전체 프로젝트에 공통적으로 영향을 미치는 요인이 무엇인지를 인식하는 것조차 어려운 경우가 많다. 그러나 데이터 웨어하우스 기술의 다차원 분석을 활용함 으로써 다양한 각도에서의 공사기간 영향요인이 미치는 생산성을 파악할 수 있다. 이에 본 연구는 건설공사에서 발생하는 다양한 영향요인에 따른 작업 생산성 데이터를 다차원적으로 분석하고 의사결정에 활용할 수 있는 데이터 마이닝 기술을 적용하여 기존 생산성 데이터들을 효과적으로 활용하는 방법을 제시한다.

국내외 비정형 건축물 외피시스템 사례 분석을 통한 설계 및 시공시 고려사항 도출

류한국,Ryu, Han-Guk 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.4

Recently, architectural design has been changing from formal design to freeform design due to the digitalization of construction industry. Especially, the formal design has been accepted as a design trend recently and applied many times as a design concept in the architectural design competitions such as turn-key. However, various deflects such as water leak and cracks have been occurred because the traditional construction methods had been applied without any revision or adaptation of the formal construction method for the freeform building construction. Design and construction of freeform building has been developed as an new method in order to solve the problems and minimize the construction duration and cost for the freeform building. Therefore this research deduced the positive implications for developing freefrom envelope by analyzing the domestic and abroad cases and proposed the considerations during design and construction of the freeform envelope as follows. First, the freeform design should consider the constructability for the freeform envelope. Second, manufacturing technology for the two-way curvature of the unit panel should be developed. Third, exposed concrete form method should be developed for the freeform envelope of concrete. Forth, material characteristics, construction method and facility management should be considered in order to manage precipitation and keep water-proof according to the classification of the freeform envelope area.

비정형 구조물의 시공성을 고려한 3차원 디지털 설계 최적화 프로세스

류한국,Ryu, Han-Guk 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.5

Nowadays the widely used media in architecture include visualizations, animations and three-dimensional models. 3D digital methods using active CAM(Computer Aided Manufacturing) and CNC(Computerized Numerical Control) imaging have been developed for accurate shape and 3D measurements in freeform buildings. In contrast to a conventional building using auto CAD system and others, the proposed digital optimization method is based on a combination of 3D numerical data and parametric 3D model for design and construction. The objective of this paper is therefore to present digital optimization process for constructability of freeform building. The method can be useful in the effective implementation of an error-proofing process of freeform building during design and construction phase. 3D digital coordinate data can be used effectively to identify correct size of structural and finish members and installation location of each members in construction field. In addition, architects, engineers and contractors can evaluate design, materials, constructability and identify error-proofing opportunities. Other project participants can also include representatives from all levels of management, departments as well as workers and key subcontractors' personnel, if necessary. The 3D digital optimization process is therefore appropriate to serious variations in freeform shape. For future study, the developed digital optimization method is necessary to be carried out to verify the robustness and accuracy for constructability in construction field.

국내 시공책임형 건설사업관리 수행을 위한 기업 역량 평가

류한국,이상원,최재현,Ryu, HanGuk,Lee, Sangwon,Choi, Jaehyun 한국건설관리학회 2020 한국건설관리학회 논문집 Vol.21 No.2

국내 시공책임형 건설사업관리(CMAR) 시장은 2019년 12월 현재 국토교통부 주도하에 수행된 시범사업을 종료하고 본 사업으로 전환되는 시점에 있으며, 발주방식의 다각화와 건설기술의 고도화를 위해 지속적으로 성장할 것으로 예측된다. 본 연구는 건설사의 CMAR 수행을 위한 자가 역량평가 도구를 개발하여 역량 수준을 평가함으로써, 수행역량을 향상하기 위해 수행되었다. CMAR 시범사업에 참여한 기업을 대상으로 수행단계와 관리영역에 따라 표준 핵심역량과 요소 기술역량을 규정하여 평가한 결과, 설계전단계 및 계약구매단계의 사업관리일반 역량이 시공단계에 비해, 설계이전 단계의 품질관리 영역이 타 영역에 비해 낮게 평가되었다. 또한 GMP를 기초로 한 시공단계의 사업비 관리영역은 높은 중요도에 비해 역량수준이 낮게 평가되었으며, 요소기술 역량에 해당하는 의사조정, 수행절차 최적화, 목표가치 달성역량 등도 초기 기술 적용수준으로 평가되어, 지속적인 역량향상이 요구된다. The Korean domestic construction management at risk (CMAR) market is in the process of completing the pilot project execution under the leadership of the Ministry of Land, Infrastructure and Transport as of December 2019. The government starts practicing CMAR an alternative delivery method widely in order to diversify delivery methods and enhance construction technology. The CMAR market is thus expected to grow. This study was conducted to improve CMAR firms' capability by developing self-assessment tools for them to evaluate current capability more effectively. As a result of defining standard core capability and additional elements categorized by project execution phase and management area, and performing evaluation from the CMAR project participants, it was found that the general project management capability in the pre-design and procurement phase and quality management area was lower compared to the construction phase and other areas. In addition, the capability of cost management area was lower in spite of its high importance. Communication and coordination, process optimization, and target values achievement were at the initial level of capability and continuous improvement was required.

착공전 단계에서의 철근콘크리트 공사 공정리스크 관리 방안

류한국,김선국,이현수,Ryu, Han-Guk,Kim, Sun-Kuk,Lee, Hyun-Soo 한국건설관리학회 2005 건설관리 : 한국건설관리학회 학회지 Vol.6 No.5

According to the recent systemic changes such as construction market reduction, five days per week system, introduction of construction duration reduction bidding system and post-construction sale system, the bidding competition have been enhanced. However, there are many construction schedule risks which could delay construction completion. Without the proper identification of construction schedule risks and the structured construction schedule risk management, the competitive advantages of construction project could not be made. Previous researches to solve the problem have been focused on the construction schedule categorization, construction schedule management, and the system development to manage the construction schedule risk. Therefore, this study selected the reinforeced concrete construction as the studied work due to the major impact characteristics on the total construction duration and the quite accident rate, and then proposed the real construction schedule risks of reinforced concrete construction and the construction risk management method based on the previous studies, many times of expert interviews and brainstorming.

사물인터넷과 실시간 위치추적 기술을 활용한 건설 장비의 안전 사고 방지 시스템 개발

류한국,김태완 한국융합학회 2019 한국융합학회논문지 Vol.10 No.9

Identifying potential accidents at construction sites is a major concern for the construction industry, and, according to the Korea Occupational Safety and Health Agency, the death rate of safety accidents caused by construction equipment is particularly high at 19.8% as of 2016. Although Internet of Things (IoT) has not been applied widely in construction sites, it can build an operating system that feeds accurate and useful information to construction accident management for identifying potential accidents. In this context, this study proposes an IoT- and RTLS-based construction equipment safety accident prevention system, which can be useful for preventing and managing safety accidents caused by construction equipment. Future deployment of such system would contribute not only to the safety of workers but also to efficient equipment and manpower operation. 건설 현장의 잠재적 사고 파악은 건설업계의 주요 관심사이며 사고 위험을 줄이기 위한 사전 안전대책이 필요하다. 한국산업안전공단에 따르면 특히, 장비로 인한 안전사고의 사망 비율이 2016년 기준 19.8%로 매우 높은 부분을 차지하고 있다. 4차산업에서 사물인터넷(IoT)은 스마트한 새로운 제조 환경을 제공하고 있다. 그러나 건설 현장에서는 IoT가 광범위하게 적용되지 못하고 있는 실정이다. IoT는 건설사고 관리에 더 정확하고 유용한 정보를 전달하는 운영체계의 구축이 가능하다. 이에 본 연구는 건설 장비로 인한 안전사고를 예방하고 관리할 수 있는 IoT 기반 건설 장비 안전 사고 예방 시스템을 제안한다. 향후 본 시스템의 개선을 통하여 작업자의 안전뿐만 아니라 효율적인 장비와 인력 운용에도 기여할 것으로 판단된다.