• Title/Summary/Keyword: 거푸집 선정 기준

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A Comparative Analysis on the Characteristics of Rammed Earth Form System based on Selection Criteria (거푸집 선정기준에 의한 흙다짐용 거푸집 시스템의 특성 비교분석)

  • Lee, Jong Kook;Lee, Jung Je
    • KIEAE Journal
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    • v.7 no.6
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    • pp.91-97
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    • 2007
  • This research examines the characteristics of the "rammed earth form" based on the criteria for the selection of forms. For this purpose, the paper first reviews the characteristics and orientation of the earth-construction and looks into the outline, the prerequisite, the current status and the tendency of the rammed earth form system through previous studies. Consequently, we aims to contribute to the criteria for the selection of rammed earth forms in the future through a comparative analysis of the construction cost, quality, safety and easiness of works between the veneer board form and the euroform, which are most widely used at earth housing project in the domestic country. The results reveals that the euroform is better than the veneer board with 21% of total cost in the cost analysis. But this better than that in the side of easiness of construction. In both cases, the buckling of wall panel form and the labor-oriented characteristics of the methods are the future research issues in the rammed earth form system.

Factors for Selecting Forms; A Case-Study (건설프로젝트 거푸집 선정 요인의 현황 및 개선 방향)

  • Jung Young-Soo;Park Ji-Ho;Kang Seung-Hee;Park Bok-Man;Choi In-Sung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2005.11a
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    • pp.111-116
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    • 2005
  • The formwork is very important in terms of time and cost of construction project. There have been ample research efforts regarding to technical issues such as types, specifications, and productivities. However, no previous research has addressed managerial requirements of the formwork. Thus, this paper investigated the present status of form work analyzing a case-study company, and derived an improvement plan for the formwork. The findings includes 1) the needs for increasing use of system forms in order to improve the quality and the safety and 2) further development of management system of formwork in order to enhance the efficiency.

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Flexural Performance of Multistage Prestressed and Self-weight Preflex Girder (다단계 자중 프리플렉스 및 프리스트레싱 합성거더의 시공단계에 따른 휨성능 평가)

  • Choi, Byung Ho;Kim, Tae Bong;Park, Sung Kyun
    • Journal of Korean Society of Steel Construction
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    • v.29 no.4
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    • pp.311-321
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    • 2017
  • This paper deals with the flexural performance of a composite girder system designed to readily form a composite section without a formwork and to easily realize multistage preflexing and prestressing. After a 3-Dimensional finite element modeling for construction stage analysis, the parametric numerical analysis was performed to analyse the stress distribution on the composite girder sections and the prestressing effects along with concrete pouring method and strand tensioning method. Based on the stress distribution analysis, a favorable construction stage model has been rationally chosen and then the ultimate flexural strengths were evaluated to conduct a comparative study, which exceed the nominal flexural strength suggested by the current design specification(ASD). It can be concluded that the proposed composite girder and fabrication procedure should have a sufficient structural performance.

Development of an Activity-Based Conceptual Cost Estimating Model for P.S.CBox Girder Bridge (대표공종 기반의 P.S.C 박스 거더교 개략공사비 산정모델 개발 -상부공사 중심으로-)

  • Cho, Ji-Hoon;Kim, Sang-Bum
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2008.11a
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    • pp.197-201
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    • 2008
  • Conceptual cost estimates for domestic highway projects have generally been conducted using governmental unit-price references. Inaccuracies in governmental unit-price data has repeatedly addressed in the Korean construction industry which often lead to poor decision making and cost management practices. Thus, needs for developing a better way of conceptual cost estimating has been widely recognized. This research is considered as the first step in developing such model using real-world cost data based on actual construction activities. The data analyzed in this paper includes 41 P.S.C (Prestressed Concrete) Box bridges which broke into 4 categories based on construction methods such as I.L.M(Incremental Launching Method), M.S.S(Movable Scaffolding System), F.S.M(Full Staging Method), and F.C.M(Free Cantilever Method). Actual design documents; including actual cost estimating documents, drawings and specifications were carefully reviewed to effectively break down cost structures for PSC girder bridges. Among more than 40 cost categories for each P.S.C girder bridge type, 7 of them were identified which accounted for more than 95% of total construction cost (ILM: 99.47%, MSS: 99.22%, FSM: 98.18%, and FCM: 98.12%). In order to validate the clustering of cost categories, the variation of each cost category has been investigated which resulted in between -1.16 % and 0.59%.

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