• Title/Summary/Keyword: 외벽

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Permanent Basement Wall Convergence Method Using a PHC Pile (PHC 파일을 이용한 영구벽체 융합 공법)

  • Ryu, Soo-Hyun
    • Journal of the Korea Convergence Society
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    • v.6 no.6
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    • pp.163-169
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    • 2015
  • This study was intended to suggest a new-concept construction method of permanent basement wall combined with earth retaining wall by using PHC piles to overcome the disadvantages of conventional CIP methods or the like which have been used just for earth retaining walls during field construction, and to determine its applicability. PHC piles are characterized by the reliable quality attributed to prefabrication (shop fabrication) as well as superior concrete strength and prestressing steel strength to that of CIP in the aspect of materials, and also higher bending moment than that of CIP in the aspect of structure.

Analysis of Factors Increasing Construction Cost for the Curtain-wall Accompanied by the Installation of a Guide Rail for High-rise Building Maintenance (초고층 외벽 유지관리용 Guide Rail 설치에 따른 커튼월 공사비 증가요인 분석)

  • Kim, Chang-Han;Han, Jae-Goo;Kim, Kyoon-Tai
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.05b
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    • pp.97-98
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    • 2011
  • The number of high-rise buildings has increased year after year, with there currently being 5 projects in progress to construct buildings higher than 100 stories in Seoul alone. The construction cost for such high-rise buildings is significantly higher than the cost for a conventional low-rise building, while maintenance costs are expected to be two to three times higher. To reduce the maintenance cost of a high-rise building, there is the need for a guide rail to be used for maintenance, which is why there is the need for research on the guide rail system. For this reason, as preliminary research to develop a guide rail, this study aims to derive the factors increasing construction cost by taking the installation of a guide rail into account. This is expected to lay the groundwork for the design and construction of guide rails for high-rise building maintenance.

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Strength Characteristics according to the mixed CaO/$SiO_2$ Ratio to Autoclaved Aerated Concrete(AAC) used on the Exterior Panel in Buildings (건물 외벽 패널용 경량기포콘크리트(AAC)의 CaO/$SiO_2$ 혼합비에 따른 강도 특성 평가)

  • Kim, Young-Ho
    • Journal of The Korean Digital Architecture Interior Association
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    • v.11 no.3
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    • pp.35-42
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    • 2011
  • The exterior system of buildings, which is the typical curtain wall, has been made with glass and metal. Theses materials, however, have weaknesses such as inadequate insulating quality, short durability, combustibility and toxic substance. On the other hand, Autoclaved Aerated Concrete(AAC) or Autoclaved Lightweight Concrete(ALC) possess the great energy efficiency and the superb insulating quality as substitute of existing exterior system materials. In this research, strength characteristics and bubble dispersion of hydrothermal synthesis process of AAC based on CaO/$SiO_2$(C/S) ratio are analyzed. C/S ratio is determinated and bubble distribution and compressive strength are studied through the test of varied water-to-solid mineral ratio(W/S). In hydrothermal synthesis program, final C/S ratio is determined as 0.7 consider of the manufacturing process and hydrothermal synthesis is done at $180^{\circ}C$ for 7 hours. The analysis shows slurry has about 2,300cP viscosity and 0.56 specific gravity therefore it is expected AAC has the appropriate facility in the manufacturing process and Hydrates of AAC's Expansion.

Sensor-based Motion Planning Algorithm for High-rise Building Facade Cleaning of Built-in Guide Type Multi-Robot (Built-in guide 타입 다중 로봇의 고층 빌딩 외벽 청소를 위한 센서 기반 운동 계획 알고리즘)

  • Lee, Seung-Hoon;Kim, Dong-Hyung;Kang, Min-Sung;Gil, Myung-Soo;Kim, Young-Soo;Back, Sung-Hoon;Han, Chang-Soo
    • Journal of Institute of Control, Robotics and Systems
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    • v.18 no.5
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    • pp.445-452
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    • 2012
  • With the increasing number of high-rise and large-scale buildings, modern buildings are becoming intelligent, and are incurring high construction costs and requiring careful maintenance. Maintenance works for high-rise buildings significantly depend on human labor, unlike other construction processes that are gradually being automated. The resulting accidents may produce very high social and economic losses. To address this problem, herein, this paper proposes robotic building maintenance system using multi-robot concept, in specific, cleaning a building facade which is directly subjected to minimize human labor; that improves the process efficiency and economic feasibility. The sensor for detecting contamination of building's outer-wall glass is proposed; Kalman filter was used for estimating robots' status with the contamination of the window glass. Task allocation of the sensor based multi-robots for an effective way of task execution is introduced and the feasibility was verified through the simulations.

Experimental Study on Solar Air Collector with Perforated Endothermic Panels (흡열 다공판을 이용한 공기식 태양열 집열 유닛에 관한 연구)

  • Kim, Myoung-Jun
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.4
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    • pp.455-459
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    • 2010
  • In recent years, the crisis of energy is growing seriously and also the contamination of ecology has been reverberated as international problem. The social concerns on energy crisis have been growing for the last several years and also the interests in new and renewable energy have been increased. Therefore, in order to solving these problems, this study has dealt with the solar air collector with perforated endothermic panel to increase the indoor temperature. And also, the PV panel for running indoor air circulating fan has used to increase the convective heat transfer. From this study, the inlet air temperature is increased up to 42[$^{\circ}C$]. This temperature is enough to heat the indoor air condition during winter season. And also the result revealed that the mixing effect of convection is increased with increasing in fan circulating power.

A Numerical Study for the Performance of Natural Smoke-venting of a Vertical Vent (수직 배연구의 자연배연 성능에 관한 수치해석연구)

  • Jeon, Heung-Kyun;Choi, Young-Sang;Choo, Hong-Lok
    • Fire Science and Engineering
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    • v.22 no.4
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    • pp.1-10
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    • 2008
  • In this study, the effects of vent location, outside temperature, wind velocity and fire size on the performance of natural venting of the vertical vent designed according to NFPA 204 standard and fire characteristics were numerically investigated using CFAST. In cases of the Vent located on most upper wall, lower outside temperature and lower wind velocity, vents met the performance criteria of venting. The larger fire size becomes, the more mass flow rate through a vent becomes, but the lower interface height of smoke layer becomes, so that vent didn't meet the performance criteria of venting. It should be noted that a natural vertical vent be designed considering maximum outside temperature and maximum wind velocity and developing a design fire accurately in order to meet the performance criteria of venting.

A Study on the Development of Height Estimation Sensor for Gondola-typed Façade Robot (곤돌라형 외벽 유지보수 로봇의 수직위치 센서 개발에 관한 연구)

  • Yoon, Jongsu;Kim, Dong Yeop;Park, Chang-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.4
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    • pp.383-389
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    • 2013
  • Demand for high-rising building has arisen. However, its maintenance is usually executed by labour. It could have a severe problem. We proposed a gondola robot to solve it. In this paper, we designed a height estimation sensor for this gondola. It is consist of pan-tilt unit, ARS sensor, and laser sensor. The pan-tilt unit keeps the laser sensor to indicate the gravity direction by referencing the ARS. The laser sensor's range is vertical distance from gondola to ground. However, if there is an obstacle under the gondola, the distance includes its height. To filter it out, we apply a Kalman filter for the height estimation. If the estimated height is changed extremely, the filter decides that there is an obstacle. Then, it remembers the height of obstacle. Other extreme changes of height estimations are reflected. The experimental results using the proposed sensor system show detail flow of the height estimation.

A Study on the Performance of Window Cleaning Robots in High-Rise Building (고층 건물 유리 외벽 청소용 로봇의 성능에 관한 연구)

  • Lee, Jin Koo;Kim, Dae Myoung;Lee, Dong Ju
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.4
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    • pp.390-396
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    • 2013
  • Due to the development of technology, there is a considerable increase in the number of skyscrapers in the world. Accordingly, there are rapid growing requests about maintenances such as cleaning, painting, and inspection. However, it is extremely dangerous working the walls of buildings, and crashes from buildings have accounted for large proportion of constructional accidents. Especially, as the number of buildings with irregular shapes increases, the accident rate during the maintenance work increases each year, and most of the accidents lead to death. An alternative solution must be developed with the commercialization of automatic systems. In this research, a fundamental research has been conducted for drafting and commercializing an automation tool that is carried in the built-in guide system, which can perform cleaning.

Analysis of the characteristics about defect signal of MFL type NDT System for Inspecting City Gas Pipelines (도시가스 배관 검사용 자기누설 비파괴검사 시스템의 결함 검출신호 특성 분석)

  • Kim, Hui Min;Yoo, Hui Ryong;Rho, Yong Woo;Park, Gwan Soo
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.868-869
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    • 2015
  • 지하 매설된 가스배관을 정기적으로 검사하기 위해서 가스 공급 및 용역업체에서는 주로 비피과검사 탐상장비인 MFL(Magnetic Flux Leakage) PIG(Pipeline Inspection Gauge)를 사용한다. 기존의 MFL PIG는 배관 내 유체(가스,오일 등)의 전후차단 압력의 흐름을 이용해 별도의 구동장치 없이 피그를 진행시켜 배관의 결함 유무를 평가하는 시스템이다. 하지만 10기압 이하의 낮은 운영압력과 T 분기관과 같이 급격한 곡관부가 존재하는 직경 16인치 이하의 도시가스 배관에는 기존의 시스템을 적용하기 어렵다. 이처럼 기존 MFL PIG의 적용이 불가한 도시가스 배관(직경 16인치 이하)을 활주하기 위해서는 우선 비파괴검사 시스템을 견인할 수 있는 추진 로봇이 필요하고 추진로봇에 적합한 자기누설 비파괴검사 시스템의 개발이 필요하다. 또한 비파괴검사 장비의 센서 시스템은 결함신호를 탐지하여 결함의 발생유무 및 결함의 형상을 판별하는 성능도 중요하다. 본 논문에서는 16인치 도시가스 배관의 검사를 위한 자기누설 비파괴검사 시스템의 기초설계와 대상 시스템의 자기적 특성을 분석한다. 또한 배관 외벽의 결함 발생 유무에 따른 자기누설 신호의 크기 및 분포변화를 3차원 유한요소법을 이용해 해석하여, 결함 검출 신호의 특성을 분석하는데 초점을 둔다.

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Preliminary Experimental Study on the Two-phase Flow Characteristics in a Natural Circulation Loop (자연순환 루프에서 이상유동 특성에 관한 예비실험 연구)

  • Kim, Jae-Cheol;Ha, Kwang-Soon;Park, Rae-Joon;Hong, Seong-Wan;Kim, Sang-Baik
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.308-311
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    • 2008
  • As a severe accident mitigation strategy in a nuclear power plant, ERVC(External Reactor Vessel Cooling) has been proposed. Under ERVC conditions, where a molten corium is relocated in a reactor vessel lower head, a natural circulation two-phase flow is driven in the annular gap between the reactor vessel wall and its insulation. This flow should be sufficient to remove the decay heat of the molten corium and maintain the integrity of the reactor vessel. Preliminary experimental study was performed to estimate the natural circulation two-phase flow. The experimental facility which is one dimensional, the half height, and the 1/238 channel area of APR1400, was prepared and the experiments were carried out to estimate the natural circulation two-phase flow with varying the parameters of the coolant inlet area, the heat rate, and the coolant inlet subcooling. In results, the periodic circulation flow was observed and the characteristics were varied from the experimental parameters. The frequency of the natural circulation flow rate increased as the wall heat flux increased.

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