• Title/Summary/Keyword: Off-Site-Construction

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A Case Study on Construction Cost Comparison for On-Site Construction and Off-Site Construction of Plant Project (플랜트 건설의 현장시공 및 모듈시공에 대한 공사비 비교 사례연구 - Pipe Rack을 대상으로 공사비 산정 -)

  • Kang, Hyun Wook
    • Korean Journal of Construction Engineering and Management
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    • v.24 no.4
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    • pp.25-34
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    • 2023
  • The purpose of this study is to calculate and compare construction costs for On-Site Construction and Off-Site Construction in Plant Project. For this purpose, the target for calculating the construction cost was limited to the Pipe Rack(Steel Structure and Piping). The results derived according to the purpose of the study are as follows. 1)The direct construction cost for On-Site Pipe Rack construction was KRW 56 billion, with Steel Structure KRW 25.1 billion and Piping KRW 30.8 billion won. 2)Comparing the rate of change between On-Site Construction and Off-Site Construction, material costs increased by 1.9% and expenses by 192.1%, but labor costs decreased by -9.1%, resulting in a total direct construction cost increase of 8.4%. These results can be used as reference data to check the current status of the increase or decrease in construction costs when constructing Pipe Racks as Off-Site Construction.

Derivation of the Construction Process for Precast Concrete System based on Off-Site Construction (OSC(Off-Site Construction)기반 PC공법의 시공 프로세스 도출)

  • Jun, Young-Hun;Bae, Byung-Yun;Yun, Won-Gun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.289-290
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    • 2021
  • The PC system has advantages in terms of project management, such as shortening the construction period and reducing costs. However, it is difficult to activate the technology due to insufficient application of the technology. Therefore, there is a need for a strategy to expand and activate the PC system. This study is a basic research for PC construction project management, and its purpose is to derive the entire construction process from factory production of PC components to on-site construction. In this study, the construction process of the PC system was derived through literature review, and the main matters for the construction process management of PC system were confirmed in the analysis process. In the future, the results of this study are expected to be used as basic data for research for PC project management, such as deriving construction classification and calculating construction periods.

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A Study of the Decision Making System in adopting Off-Site Construction Method in the Initial Stage Considering the Building Project Characteristics -Focused on Structure Work of Apartment Housing- (건축 프로젝트 특성을 고려한 초기 단계에서의 Off-Site Construction 공법 도입 여부 의사 결정 시스템 개발 - 공동주택 골조공사 중심으로 -)

  • Lee, Sungho;Cha, Heesung;Son, Bosik
    • Korean Journal of Construction Engineering and Management
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    • v.23 no.1
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    • pp.89-97
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    • 2022
  • Recently, various problems such as reduced productivity, insufficient inflow of skilled manpower, reduced quality, and concerns about increasing safety accidents have appeared in the domestic construction industry. Stakeholder of construction project are considering the Off-Site Construction (OSC) method rather than the conventional on-site construction as an alternative. Despite the importance of decision making in the early stage of the adoption of OSC, there is a lack of methodologies for rational decision making. In this study, a decision making system has been developed to derive the final construction cost score by deriving the project characteristics, selecting the construction difficulty index, and developing a cost model for each construction method alternatives to calculate the standard construction cost. Using this system, the OSC method can be effectively evaluated in terms of its feasibility in the early stage of construction

A Study on Development of Construction Standard Production Rates and Cost Analysis for Off-Site Construction (OSC)-Based PC Structure Construction Costs - Comparison with RC Method - (OSC기반 PC구조 공사비 산정을 위한 품셈개발 및 공사비 분석 - RC공법과 비교 -)

  • Lee, Hansoo;Lee, Chiho;Han, Heesu;Lee, Jeongwook
    • Korean Journal of Construction Engineering and Management
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    • v.25 no.2
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    • pp.56-68
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    • 2024
  • A construction standard production rates system for the factory built and on-site installation phases of OSC (Off-Site Construction)-based precast concrete (PC) structures in apartment buildings was recently proposed to establish an objective cost standard (Lee et al., 2021). In addition, the Korean government has taken steps to improve the institutional foundation for the systematic calculation of PC construction costs such as revising construction standard production rates for major components that can be applied to the on-site installation phase of PC method. In this study, we analyzed the results of a field survey of apartment building PC structures and collected expert opinions to develop factory-built and on-site installation standard production rates that can be applied to apartment building PC method. We also propose directions for improving the standard production rates so that they can be applied to the site and component of apartment buildings by comparing them with the current standard production rates. This study also derived the cost characteristics and cost reduction measures of PC construction by calculating the construction costs using the developed rates and comparing the construction costs with the RC methods of apartment buildings of the same scale. The construction standard production rates for PC construction derived in this study are expected to contribute to the spread of PC construction by ensuring the objectivity and consistency of the results of PC methods cost estimation.

A study on the Composition of the Production Rates System to Prepare Standards for Calculating the Construction Cost of PC Structure Apartments Based on Off-Site Construction (OSC) (OSC 기반 PC구조 공동주택 공사비 산정기준 마련을 위한 품셈 체계 구성에 관한 연구)

  • Lee, Hansoo;Lee, Chiho;Lee, Jeongwook;Noh, Hyunseok
    • Korean Journal of Construction Engineering and Management
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    • v.22 no.6
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    • pp.96-106
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    • 2021
  • The PC structure based on the OSC (Off-Site Construction) is mentioned as a representative method of innovation in the construction industry that converts the existing construction environment from site-centered to factory production-transportation-site assembly. However, recent research on PC method has focused on improving the functions of subsidiary materials and improving the production system to increase productivity and institutional / policy R&D that can be universally applied to the life-cycle stage of ordering / design /construction is insufficient. In particular, the absence of standardized cost calculation standards makes it difficult to calculate and verify of objectified appropriate construction cost. So which is an obstacle to the activation of the PC method. In this study, the standards for construction costs of domestic and foreign PC method were surveyed and similar Construction Standard Production Rates were analyzed to confirm the product structure suitable for PC method. Subsequently, the construction procedures and input resources for each PC subsidiary materials were identified through on-site surveys to derive component for subsidiary materials, and the factors of change in the product according to the construction characteristics(height, weight of subsidiary material) were verified. As a result the standard product calculation system suitable for the site installation of the PC method for apartment was presented.

A Study on the Critical Success Factors of Off-Site Construction through Keyword Frequency Analysis - A Literature Review of Overseas Research - (키워드 빈도분석을 통한 OSC (Off-Site Construction) 프로젝트의 성공요인 고찰 - 해외연구 문헌고찰을 중심으로 -)

  • Jung, Seoyoung;Yu, Jungho
    • Korean Journal of Construction Engineering and Management
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    • v.22 no.1
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    • pp.13-26
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    • 2021
  • To promote the off-site construction (OSC) in Korea, technical innovation applied to each phase, such as design, engineering, factory production, and site assembly, is important and equally necessary is the development of management and operation methods that are different from existing construction production methods. However, the current OSC-related studies in Korea are conducted from the technical development viewpoints, such as construction methods. Additionally, few studies have been conducted to derive a management measure for successful OSC projects. Therefore, studies to derive a management measure based on a clear understanding of the core success factors of OSC projects are required. This study aims to analyze several studies related to the success factors of OSC projects conducted overseas and to show its core implications for the successful management of OSC projects in Korea. We expect this study to improve the viability of OSC projects, which will be expanded in Korea in the future.

Towards a Transportation Support System for Off-site Construction : Identifying Key Functions and Diagramming Functional Blocks (오프사이트건설(Off-site Construction) 운반 시스템을 위한 핵심기능 도출 및 시스템 기능 전개도 개발)

  • Lee, Gangho;Kim, Minguk;Lee, Chansik;Koo, Choongwan;Kim, Taewan
    • Korean Journal of Construction Engineering and Management
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    • v.22 no.2
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    • pp.21-30
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    • 2021
  • The existing construction industry is classified into industries with low productivity compared to other industries. In order to solve the decline in productivity in the construction industry, the world is focusing on off-site construction (OSC), which is about 40% more productive than existing construction methods. This high productivity is possible because the three stages of production, transport to the site, and site assembly are consistently maintained in a continuous flow. This study conducted a functional survey through literature review, preliminary field survey, questionnaire, and expert interview. The surveyed function were classified into five categories: convenience, flexibility, manageability, communication, and safety, and the functional characteristics of flexibility, manageability, and communication were high. Because of the change according to the construction progress, the production schedule of the factory, and the variety of transportation time required. Finally, A functional block diagram was developed based on the 15 functions corresponding with an average score of 4 or more in the surveyed function score result. If the OSC transport system is established through this study, It can contribute to a successful construction OSC project and increase productivity.

Development of Simulation Model for Optimization of Modular Construction Transportation Plan (모듈러 건설의 운송계획 최적화를 위한 시뮬레이션 모델 개발)

  • Kim, Hyeonmin;Kwon, Woobin;Ahn, Heejae;Cho, HunHee
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.04a
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    • pp.200-201
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    • 2022
  • Off-Site Construction is being widely adopted as an alternative to solve endemic problems in construction industry such as low productivity and efficiency. However, it is strongly recommended to examine the transportation process to be optimized because it determines the size of a modular and influences the cost of the construction. Therefore, in this study simulation model for optimization of modular construction transportation plan was developed using AnyLogic. As a result of the study, the influence of trailer transport capacity and transport time increases as the number of modular which should be transported from factory to site increases.

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Deriving Critical Management Factors based on Case Studies of Multi-trade MEP Ceiling Rack Prefabrication (복합공종 MEP 천정 선조립 공법 사례조사를 통한 단계별 중점관리사항 도출)

  • Lee, Dongmin;Jang, Sejun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.11a
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    • pp.76-77
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    • 2015
  • In construction industry, management of construction factors such as cost, schedule, quality and safety is the most important key for delivering successful projects. According to the Smart Market Report, a magazine specialized in construction industry, recently said 'Off-site Prefabrication' is a significant trend related with construction productivity in global construction industry. It is a kind of practice shift from On-site to Off-site. A lot of general contractors in oversea have been using 'Multi-trade MEP Ceiling Rack Prefabrication' method for getting benefits such as decreased cost & schedule and increased labor productivity. Thus, in this paper, critical management factors at each phase from design to installation was derived by researching case studies. Forwardly, it can be a basic guideline for applying Multi-trade MEP Ceiling Rack Prefabrication in Korea construction industry.

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Modular reactors: What can we learn from modular industrial plants and off site construction research

  • Paul Wrigley;Paul Wood;Daniel Robertson;Jason Joannou;Sam O'Neill;Richard Hall
    • Nuclear Engineering and Technology
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    • v.56 no.1
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    • pp.222-232
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    • 2024
  • New modular factory-built methodologies implemented in the construction and industrial plant industries may bring down costs for modular reactors. A factory-built environment brings about benefits such as; improved equipment, tools, quality, shift patterns, training, continuous improvement learning, environmental control, standardisation, parallel working, the use of commercial off shelf equipment and much of the commissioning can be completed before leaving the factory. All these benefits combine to reduce build schedules, increase certainty, reduce risk and make financing easier and cheaper.Currently, the construction and industrial chemical plant industries have implemented successful modular design and construction techniques. Therefore, the objectives of this paper are to understand and analyse the state of the art research in these industries through a systematic literature review. The research can then be assessed and applied to modular reactors.The literature review highlighted analysis methods that may prove to be useful. These include; modularisation decision tools, stakeholder analysis, schedule, supply chain, logistics, module design tools and construction site planning. Applicable research was highlighted for further work exploration for designers to assess, develop and efficiently design their modular reactors.