• Title/Summary/Keyword: 코어 월

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Improving Construability by Analyzing Influencing Factors of Core-Wall Construction (코어월 선행공법의 영향 요소 분석을 통한 시공성 향상에 관한 연구)

  • Ku Seong-Hun;Ahn Byung-Ju;Kim Jae-Jun
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.606-609
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    • 2003
  • The need of high-rise building is increased, because population is concentrated and the building site is limited in the city. Owing to this request buildings in downtown become more high rise. Therefore, we must develop the design, structure, high technology and materials. The core wall construction is one of the method of construction preferred because it cut down the cost and decrease the schedule. According to research in this study, we found that the selection process of core wall system form is focused on the schedule and cost. the construability is relatively failed to notice. As a result, the problem of construability is happened under the construction, it lead to delay the schedule and increase the cost. The purpose of this study is suggest to decision making process of core wall system form considered improving construction productivity.

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An Analysis of Planning Practice for Reinforced Concrete Core-Wall Construction in High-Rise Building Construction (초고층건물 R/C조 코어월 선행공사의 시공계획 실무에 관한 분석)

  • Ahn Byung-Ju
    • Korean Journal of Construction Engineering and Management
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    • v.5 no.2 s.18
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    • pp.194-201
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    • 2004
  • Core-wall construction method is applied in many high-rise building constructions. This is caused by the advantages of the method such as the effect of saved construction cost and shortened period. However, the analysis study of planning practice for core-wall construction shows matters take place during core-wall construction, such as increasing in construction cost and period. These matters result from the limited work space leading to low productivity, the activity interference leading to increasing in period, additional temporary work cost and time, and delayed concrete pour activity. A large part of these can be prevented taking place by very detailed and most careful core-wall construction plan. Therefore, this study suggests improvement directions of core-wall construction planning process focused on the cooperation system of a contractor between a sub-contractor and the process.

Working Posture Analysis Using OWAS method of Core Wall Construction in High-rise Building (OWAS기법을 활용한 초고층 코어월 공사의 근로자 작업자세 분석)

  • Lee, Junehyuck;Kim, Taehoon;Cho, Hunhee;Kang, Kyung-In
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.05a
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    • pp.72-73
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    • 2016
  • Working Posture is an important factor directly connected with quality and productivity of the construction project. In particular, High-rise building construction is required to manage the working posture due to the repetitive task and unfavorable working condition such as high place work, limited space. However existing construction planning of high-rise building construction has a negative effect on the labor's productivity because it is not insufficiently considered for working posture. Therefore the purpose of this study is to suggest a work that needs improvement by analyzing labor's working posture quantitatively using OWAS method. These results would provide the basic information to improve the productivity of the construction project by supporting the construction plan considering the working posture in high-rise building.

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Automatic Climbing System (코어벽체 거푸집 시스템)

  • 문인수
    • Magazine of the Korea Concrete Institute
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    • v.14 no.5
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    • pp.27-30
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    • 2002
  • ACS(Automatic Climbing System) 거푸집은 당 현장에서 코어 월 철근 콘크리트 공사시 사용되는 대형 거푸집으로써 상대 플로우 잭에 의해 자동으로 1개 층씩 상승되는 시스템으로 안전난간 및 안전발판을 설치하여 추락, 낙하재해에 대비하였으며 외부에 천막을 설치하여 비산먼지, 소음 등을 방지할 수 있도록 설치/운영 중이다. (그림 1)은 ACS 거푸집의 구성을 나타내었다.(중략)

Case Study of the Field-BIM for Precision Construction of Elevator Core Wall in Top-down Project (Top-down 공법 현장에서 엘리베이터 코어월 정밀 시공을 위한 시공 BIM의 적용 사례 연구)

  • Shim, Hak-Bo;Seok, Won-Kyun;Park, Soon-Jeon
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.11a
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    • pp.108-109
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    • 2019
  • Top-down construction is a useful method of utilizing the working space, economic benefits and shorten the construction period. Precision construction of the elevator core is very important for safety of the top-down structure. In this study, the layout system for the field-BIM(Building Information Modeling) was used to precisely construct the elevator core in the basement and the ground. Through the layout system, it was possible to process the construction status, review the design results and construction errors, and confirm whether there is or not within the construction error range for elevator installation.

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A Research on a Comparison between the Strength and Weakness of Each Formwork Methods in the Core Wall Construction (대형 시스템 거푸집 공법별 장단점 비교에 관한 연구)

  • Shin, Han-Woo;Kim, Gwang-Hee;Kim, Jae-Yeob;Cho, Hyung-Keun
    • Journal of the Korea Institute of Building Construction
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    • v.7 no.4
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    • pp.153-159
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    • 2007
  • Recently, as a result of the economic growth, the concentration of population towards the cities and the rise in land prices, the demand for high rise buildings has increased significantly, the trend to build high rise buildings such as the mixed-use development buildings by the domestic construction companies continues. It's very important what kind of form work system is applied on the Core Wall of the high rise buildings to determine the economic efficiency for the whole project. That's because the appropriate selection of the Formwork system enables the construction cost lower, makes the good quality of the finished concrete, reduces the construction period, assurance of safety, and further more, it enables to achieve the successful performance of the projects. Therefore, this research, after comparing the strength and the weakness between the construction methods, focus the point to provide a builder the basic data to choose the right Formwork method.

A Study on Mechanical Properties of High Strength Concrete Performed by Full Scaled Mock-up Test (1:1 실부재 Mock-up Test를 통한 고강도 콘크리트의 역학적 특성에 관한 연구)

  • Moon, Hyung-Jae;Seok, Won-Kyun;Park, Soon-Jeon;Lee, Joo-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.981-984
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    • 2008
  • The super tall building above 100 floors is required that each floor's height is more than 4 meters, and each core wall's thickness is more than 60cm. Therefore, for the successive accomplishment of super tall building, the full scale mock-up test was required. The test results are as follows; Real strength of core wall was satisfied with design strength at 28 days regardless of types of strength, and according to the consolidation effect, lower part's strength was a little higher than upper part's strength. Lateral force of HSC was evaluated with max. $4.5ton/m^2$, and hydration temperature of mock-up test was evaluated that maximun heat of central part revealed about $80^{\circ}C$ at 70MPa and $65^{\circ}C$ at 50MPa, and, the difference between inner and outter part revealed about $30^{\circ}C$ at 70MPa and $12^{\circ}C$ at 50MPa. Also, no crack by hydration temperature was not shown on the surface.

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Design and Construction of the Burj Dubai Concrete Building Project (버즈 두바이 콘크리트 건물의 설계와 시공)

  • Abdelrazaq, Ahmad
    • Magazine of the Korea Concrete Institute
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    • v.20 no.6
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    • pp.28-35
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    • 2008
  • The Burj Dubai Project will be the tallest structure ever built by man; when completed the tower will be more than 700 meter tall and more than 160 floors. While the early integration of aerodynamic shaping and wind engineering considerations played a major role in the architectural massing and design of this multi-use/residential tower, where mitigating and taming the dynamic wind effects was one of the most important design criteria, the material selection for the structural systems of the tower was also a major consideration and required detailed evaluation of the material technologies and skilled labor available in the market at the time Concrete was selected for its strength, stiffness, damping, redundancy, moldability, free fireproofing, speed of construction, and cost effectiveness. In addition, the design challenges of using concrete for the design of the structural system components will be addressed. The focus on this paper will also be on the early planning of the concrete works of the Burj Dubai Project.

The Application of Post-tensioned Slab System to Tall Buildings (초고층 건축물의 포스트텐션 슬래브 시스템 적용)

  • Chung, Kwang-Ryang
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.879-882
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    • 2008
  • The market of Korea of post-tension system for building is growing up since 2000 and many engineers and construction companies show interest in it. This paper introduces the structure system and construction of post-tension tall buildings including recent trend in the industry of post-tension system for buildings in Korea and the point to be considered when design post-tensioned tall building. Park Polis is composed of two towers of 39 stories with a level to the top of the roof +144m and is currently under construction at Ulsan in Korea. This building designed as the unbonded post-tension floor system and will be the tallest and first high-rise post-tensioned building in Korea. The structural system is composed of the flat slabs, perimeter columns and core walls. At first, this building had designed as regular RC flat slab with perimeter beams. However, floor structure system was reconsidered because the construction company wants to improve efficiency of construction. As a result, the floor system of PARK POLIS re-designed as PT flat slab.

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Suggestion of the Prediction Model for Material Properties and Creep of 60~80MPa Grade High Strength Concrete (설계기준강도 60~80MPa급 고강도콘크리트의 재료 특성 및 크리프 예측모델식 제안)

  • Moon, Hyung-Jae;Koo, Kyung-Mo;Kim, Hong-Seop;Seok, Won-Kyun;Lee, Byeong-Goo;Kim, Gyu-Yong
    • Journal of the Korea Institute of Building Construction
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    • v.18 no.6
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    • pp.517-525
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    • 2018
  • The construction of super tall building which structure is RC and must be certainly considered on column shortening estimation and construction reflected concrete creep has been increased. Regarding the Fck 60~80MPa grade high strength concrete applied in the domestic super tall building project, the mechanical properties and creep deflection according to curing conditions(Drying creep/Basic creep) were reviewed in this research. Results of compressive strength and elastic modulus under sealed curing condition were 5% higher than unsealed condition and difference of results according to the curing condition was increased over time. Autogenous and drying shrinkage tendency showed adversely in the case of high strength concrete. Additionally, creep modulus under unseal curing condition was evaluated 2~3 times higher than sealed condition. Modified model of ACI-209 based on test result was applied to estimate long period shortening of vertical members(such as Core Wall/Mega Column) exactly, it is designed to modify and suggest the optimal creep model based on various data accumulated during construction, in the future.