• Title/Summary/Keyword: 골조공기단축

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Analysis on Stripping Time of Form of High-Early-Strength Concrete Incorporating Binder and Admixture (결합재 및 혼화제를 사용한 조강 콘크리트의 거푸집 탈형 시기 분석)

  • Jun, Myoung-Hoon;Bang, Jong-Dae;Lee, Bum-Sik;Park, Seong-Sik;Park, Ji-Young;Cho, Gun-Hee
    • Land and Housing Review
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    • v.4 no.2
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    • pp.193-200
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    • 2013
  • Construction duration in construction project is an important factor which affects project cost. Advanced countries have reduced project cost by time shortening. Even though domestic construction companies have tried to time shortening, they yet failed to find systematic method for time shortening. Typically, duration of structural framework is affected by stripping time of form. Therefore, it need to shorten the stripping time of form for time shortening of structural framework. In this study, specimens of high-early-strength concrete were manufactured with variety conditions and compressive strength was tested. This study proposed stripping time of side and slab forms using test results. The stripping time of form was shortened when using high-early-strength concrete in structural framework by the test results. The result of this study will be useful for time shortening of structural framework.

Development of an Effective Time Scheduling Mechanism of the Structural Framework for the High-rise Apartment Housing -Focusing on One Cycle Time Scheduling Mechanism of Typical Floor- (아파트 골조공사의 공기단축 및 효과적 공정운영 방안 -기준층 사이클 공정분석을 중심으로-)

  • Han Choong-Hee;Bang Jong-Dae
    • Korean Journal of Construction Engineering and Management
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    • v.5 no.4 s.20
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    • pp.87-96
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    • 2004
  • The construction duration in apartment construction is an important factor which affects project cost. Henceforth, the time shortening is essential to retrench project cost and project risk when there adopt Five-Day Workweek and introduce apartment sales after completion of construction. Therefore, the purpose of this study is to examine closely the affecting factors on the duration of framework which forms about $40\sim50\$ percent of total time in apartment construction by analyzing the schedule mechanism of typical floor and to show the reasonable time shortening methods by case study. The shown schedule mechanism and basic schedule table can utilize as a guideline in case of scheduling of framework in the existing construction method. Also, the shown time shortening methods by three case studies will guide the direction and process of time shortening while there need time shortening in many-sided projects.

An Assessment of Field Application of Elementary Technology for Reducing Construction Duration in the Apartment Housing Construction (공동주택 골조공기단축을 위한 요소기술의 현장 적용성 평가)

  • Kim, Kyu-Hoi;Park, Moon-Seo;Lee, Hyun-Soo;Park, Song-Woo;Joo, Sun-Woo
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2007.11a
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    • pp.368-372
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    • 2007
  • Recently, construction companies prefer to use large scale system forms to prepare for lacking of skilled workers, aging and the chances of application of pre-build&post-sale policy. In result of the effort and interest, the duration for framework of domestic high rise buildings has been accomplished to 3-4days per floor but for the apartment housing which form over 90% of the domestic construction industry, and especially the middle story RC apartments which is the main part, the duration for framework is only about 6-8days per level. This is only about 50% of the duration per level of RC residential buildings in North America. In previous researches elementary technology, which has potential of duration reduction, was proposed and this research suggest the applicability in construction sites and ways to improve it using elementary technology applied Mock-up Test. Furthermore, we analyze the productivity and T/C usage rate of the 6day-Cycle and suggest an improved model.

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Structure and Construction Technology Analysis about Construction Sequence Change for Superstructure Construction Period Reduction in Top-down Method (역타공법 중심의 골조 공기단축을 위한 시공시퀀스 변경에 따른 구조해석 및 요소기술 분석)

  • Park, Yong-Hyeon;Ju, Young-Kyu
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.35 no.6
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    • pp.101-109
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    • 2019
  • The purpose of this study is to improve a general Top-Down construction process for superstructure construction period reduction. In a general Top-Down construction sequence, the ground floor slab is set up first. Subsequently, 1st basement level construction including core walls is constructed. Initiation of the ground level superstructure gets waited until then. In this study, removable deck plate installation on the bottom of the core walls of ground level is preceding the concrete casting, therefore, ground level superstructure construction is able to get started earlier. Up to first typical floor concrete casting, total of seventy-two working(calendar) days will be resulted in a reduction from the total construction periods.

Effects of Time Shortening on Project Cost in Housing Complex with Different Number of Layers (저층·고층 아파트가 혼합배치된 단지에서 공기단축이 건설사업비에 미치는 영향 분석)

  • Bang, Jong-Dae;Chun, Young-Soo;Jun, Myoung-Hoon;Kim, Sa-Rang;Lee, Do-Heun
    • Land and Housing Review
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    • v.3 no.4
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    • pp.415-421
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    • 2012
  • In case of Korean housing complex, there became more mixed arrangement of buildings with different number of layers for a variety of urban skyline, recently. For example, around 33% of the construction sites of 'A' public corporation have gaps of more than 4 layers between high-rise buildings and low-rise ones in the same site, according to the survey. Generally, construction duration of the housing complex is estimated based on the layers of the highest building. Due to this baseline, whole construction duration could be extended so that the project cost could be increased. Therefore, framework duration of higher-rise buildings should be reduced to secure the feasibility of the project. On the other hands, these shortenings could adversely harm the feasibility in some cases because there are a wide range of combinations of the buildings with different number of layers in designing housing complex. Therefore, this study shows the results of analysis on effects of framework time shortening on the cost in housing complex project. Moreover, this could set the baseline of checking possibilities in condensing the construction duration of projects with buildings of different layers by supplying comprehensive database.

Evaluation of Early Compressive Strength of Concrete Using Early Strength Improvement Type Cement and Early Strength Activator (조기강도 개선형 시멘트 및 초기수화 촉진 혼화제를 사용한 콘크리트의 조기압축강도 발현특성 평가)

  • Park, Gyu-Yeon;Kim, Gyu-Yong;Choe, Gyoeng-Choel
    • Journal of the Korea Institute of Building Construction
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    • v.14 no.4
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    • pp.322-328
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    • 2014
  • In this study, revelation performance of concrete at early age according to types of cement, water reducing ratio of high performance superplasticizer and mixing of accelerator for early hydration was examined aiming for reduction of construction period of framework through securing strength at early age of concrete. It was observed that strength at early age, 5MPa in 12hours, 14MPa in 18hours, is secured by early strength improvement type cement and using promotion admixture for early hydration which are Sodium persulfate, Potassium hydroxide. Therefore cost reduction is expected to be possible in construction site by reducing construction period of frame work.

Analysis of Floor Slab and Support for the Shortening of Construction Time in High-Rise Wall-Type Apartment Building (고층벽식구조 아파트에서 골조공사 공기단축을 위한 바닥 슬래브 및 지주의 해석)

  • Kim, Young-Chan;Kwon, Ki-Sang
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.6 no.1
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    • pp.141-147
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    • 2002
  • 국내 주거의 주종인 아파트의 구조형식은 벽식 철근콘크리트조로 경제성 때문에 대부분 고층으로 지어지고 있다. 철근 콘크리트구조 건물을 구체공사비중 상당부분이 거푸집공사에 투입되고 있다. 구체공사의 공기(工期)는 층당 소요일수로 산정할 수 있는데 공사비 절감 및 공기단축을 통한 시공효율상의 향상을 위해서는 지주시스템의 효율적인 전용(轉用)이 필수적이라 할 수 있다. 본 연구에서는 벽식구조 아파트의 현장조사를 토대로, 현재 사용되고 있는 지주시스템 및 바닥슬래브에 대한 응력해석을 수행하고, 이를 분석하여 공기단축의 가능성을 검토하였다.