• Title/Summary/Keyword: Construction quality control

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Suggestions for Quality Management through Analysis of Construction Process of Multi-layer Modular Housing (적층식 모듈러주택의 시공 프로세스 분석을 통한 품질관리 중점사항 제안)

  • Sohn, Jeong Rak;Lee, Dong Gun;Bang, Jong Dae;Kim, Jin Won
    • Land and Housing Review
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    • v.10 no.3
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    • pp.67-75
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    • 2019
  • The modular construction means that more than 70% of the parts such as walls, windows, electrical wiring, facility piping, bathrooms, and kitchen appliances are pre-assembled at the factory and transported to the site. It is possible to shorten the construction period than general construction work and to secure high quality through modular mass production since the modular construction works in the field at the same time as the modular production. However, there are only four domestic modular manufacturers, and each company's modular components and construction methods are different, so it is necessary to standardize them. Therefore, this study investigated the construction process centering on the stacking method of modular housing construction work applied to D site in Cheonan-si, and proposed the key points of quality management by construction stage. As the project was conducted as a pilot project for government R&D projects, some differences may occur from general modular housing construction. However, the construction process and quality control focus of each unit box type modular house analyzed in this study can be used as basic data in the future of modular housing construction. In addition, the results of this study can be used to establish construction standards, such as the development of checklists and establishment of standard processes.

Current Status and Appropriate Check Method of Construction Quality Control for Rebar Coupler Splice (철근 커플러이음의 시공품질 확인 현황 및 적정 시공품질 확인 방안)

  • Kim, Ju-Yong;Kim, Jin-Dong;Lee, Young-Do;Kim, Gwang-Hee
    • Journal of the Korea Institute of Building Construction
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    • v.22 no.6
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    • pp.531-542
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    • 2022
  • As buildings become taller, the strength of structural materials must increase and the amount of rebar reinforcement also increases while the application of an appropriate rebar splice method in the construction process become one of the essential factors. In this research, the current status of quality check for rebar coupler is identified by an expert questionnaire and an appropriate quality check method is proposed through a quality test on specimens similar to actual on-site construction. In the test results, it was revealed that, among the quality check methods for rebar coupler joints, the coupler tightening method and face to face degree of between upper and lower rebar did not affect the strength the specimen. Therefore, it is considered to be an appropriate way to check the coupler quality check to check whether the threads are completely assembled during on-site construction through manufacture the number of threads of rebar and coupler with a margin beyond the calculated thread number.

A Study on the Method of Preliminary Works Management for a Schedule Performance Management (공정이행관리를 위한 선행작업관리 시안)

  • Park, Hong-Tae;Song, Young-Sun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.3
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    • pp.757-764
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    • 2008
  • It is important to know the activities itself exactly and to control the activities correctly so as to assure timely progress and the quality of any project. In order to progress smoothly in accordance with construction schedule, it is important to systematize the preliminary arrangements necessary for each process and then manage them. In this study, in order to progress smoothly the qualify and schedule management of the construction, We can make systematically preliminary works in accordance with construction schedule by the architecture construction items of the apartment house construction. We suggested important preliminary control item by the workers through experiential method of construction engineers in accordance with network schedule. should not use "we" in technical sentence.

Earned Value based Construction Project Control System (Earned Value 기반 프로젝트 관리체계 및 사례연구)

  • Lee Yoo-Seob;Cho Chang-Yon;Oh Kyu-Hoan;Kim Jung-Hun
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.123-130
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    • 2002
  • Project plan and control is a highly skilled task which is vital for business success, and Project control systems are important for successful project execution. To support construction process management effectively, an integrated cost and schedule control function is required to collect quality data in a timely manner and to provide quality historical data for future planning of new projects. In Korea construction industry, the development and implementation cases of a project control system which to efficiently support construction project planning and controlling processes, have been increased to ensure a project success and the profitability of a construction company. To contribute to improving practical effectiveness of a project control system, the paper reviewed and analyzed the current trends and functional features of current project control systems. And it also described the pending issues and their solutions faced on previous project control systems.

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Earned Value based Construction Project Control System (EV기반 공사관리시스템 기능의 비교분석 연구)

  • Lee Yoo-Seob
    • Korean Journal of Construction Engineering and Management
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    • v.5 no.1 s.17
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    • pp.168-174
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    • 2004
  • Project plan and control is a highly skilled task which is vital for business success, and Project control systems are important for successful project execution. To support construction process management effectively, an integrated cost and schedule control function is required to collect quality data in a timely manner and to provide quality historical data for future planning of new projects. In Korea construction industry, the development and implementation cases of a project control system which to efficiently support construction project planning and controlling processes, have been increased to ensure a project success and the profitability of a construction company. To contribute to improving practical effectiveness of a project control system, the paper reviewed and analyzed the current trends and functional features of current project control systems. And it also described the pending issues and their solutions faced on previous project control systems.

Soil Compaction Management Methodology using Mechanical Property (역학적 정수를 이용한 다짐관리기법에 관한 연구)

  • 강규진;최준성;김종민;노한성;김태수
    • Proceedings of the Korean Geotechical Society Conference
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    • 2002.03a
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    • pp.127-132
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    • 2002
  • While the pavement design is based on mechanical property such dynamic elastic modulus, the quality of highway subgrade during construction is controled by the optimum moisture content(OMC) and maximum dry density(${\gamma}$$\_$dmax/). However, since the quality control based on the OMC and maximum dry density does not consider the mechanical characteristics, there is a conceptional gap between design and PMS(pavement management system). Therefore, it is necessary to develope a new qualify control system using mechanical property for highway construction in more rational way. To achieve this goal, it is planned to perform various laboratory tests to collect mechanical properties of subgrade soil samples from several highway construction sites and to propose the relationship between dry unit weight (or OMC) and mechanical parameters. In this paper, the experimental data so far obtained are presented and analyzed. In addition, further research plan is presented and discussed.

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A Study on the Application in Site of the Concrete Using Fly Ash Produced in Combined Heat Power Plant (열병합발전소 플라이애쉬를 사용한 콘크리트의 현장적용에 관한 연구)

  • 김무한;이상수
    • Journal of the Korea Concrete Institute
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    • v.11 no.5
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    • pp.41-49
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    • 1999
  • This study dealt with the applicability and quality control of the concrete using fly ash produced in combined heat power in a construction site. Firstly, chemical and physical characteristics of the fly ash produced in combined heat power plant re analysed. Also, after investigating the properties of flesh and hardened concrete through various experiments, the fly ash concrete was placed in depositing construction in Ulsan Petrochemical Service Co. This field application was focussed on the quality control system in the site as production, placing and curing of concrete. As the result of this study, the quantity of CaO in the fly ash is relatively high based on the chemical analysis. The fly ash concrete showed slumping maintenance and high viscosity properties in the optimal mixing conditions (W/B:44~45%, S/a:$45\pm$2%, W:185kg/m). And, quality control and assurance of the fly ash concrete in actual site were verified by various testing methods.

Quality control plan for water leaks through step-by-step review of modular housing (모듈러 주택 단계별 검토를 통한 누수하자 품질관리 방안)

  • Cho, In-Su;Kim, Gyu-Yong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.169-170
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    • 2023
  • Leakage defects account for a significant proportion of defect cases in modular homes. There are factors that can cause leakage defects at each stage, and quality control measures are required to minimize them. An improvement plan to prevent leakage defects was applied from the design drawings to the site of a modular public rental apartment complex in Sejong City 6-3, and a quality control plan was proposed to minimize leakage defects in the remaining process processes.

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Improvement of Watertightness Evaluation Method in Waterproof Membrane (복합계 멤브레인 방수층의 수밀성 시험 평가방법 개선방안 연구)

  • Kim, Meong-Ji;Seon, Yun-Suk;Kim, Soo-Yeon;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.11a
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    • pp.50-51
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    • 2018
  • Although the introduction of new materials and new construction methods and overseas materials has become more active due to the diversification of the construction market, the quality standards of waterproofing methods in Korea are insufficient. In particular, the quality control standard is applied to the KS F 2622:08 (Membrane Waterproofing layer performance test method), which is the existing standard, to prepare standards for quality control of waterproof materials, which is increased in Korea.

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Feasibility Study on Installation of Individual Room Control Ventilation in Apartment House (공동주택의 실별 제어환기 도입 타당성 분석)

  • Kim, Jung-Yup;Shin, Hyun-Joon;Kwon, Yong-Il;Yun, Young-Woo;Cho, Chun-Sik
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.502-507
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    • 2009
  • Trend of mechanical ventilation system applied to apartment house is introduced and feasibility study on installation of the individual room control ventilation as energy-saving method is carried out through field experiment. While initial cost of installation for the individual room control ventilation increases, the running cost is lower than the individual household control ventilation due to automatic flow rate control and reduction of fan power, and the management cost also decreases due to extension of use life of components. As the results of field experiment on $115m^2$-type apartment house, the individual room control ventilation could save the amount of 1,459.5Wh/day when compared with the individual room control ventilation

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