• Title/Summary/Keyword: 감지기/작동기 시스템

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Development and Application of Ultra Small Micro-Cone Penetrometer (초소형 마이크로콘 관입시험기의 개발 및 적용)

  • Lee, Jong-Sub;Shin, Dong-Hyun;Yoon, Hyung-Koo;Lee, Woo-Jin
    • Journal of the Korean Geotechnical Society
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    • v.24 no.2
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    • pp.77-86
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    • 2008
  • The disturbance zone and measured values are affected by the size of the penetrometer. The local value may be measured by the smaller penetrometer. An ultra small Micro-Cone penetrometer (5mm in outer diameter) is designed and manufactured to characterize soil properties with minimum disturbance during penetration tests. The tip resistance is measured by using stain gauges attached near the Micro-Cone. In addition, the friction sleeve is adopted to effectively remove the skin friction from the tip resistance. Design concern includes the installation of stain gauges, circuits, penetration systems, penetration rate, sampling rate, operating temperature, and calibration. Application tests show that the clay interface, and the soil layers consisting of clay and sand are clearly detected by the Micro-Cone. Furthermore, the cone tip resistances measured by the Micro-Cone and the miniature cone (16mm in outer diameter) are similar. Note the resolution is much higher in the Micro-Cone. This study shows that the Micro-Cone may effectively detect the soil interface with high resolution, and with minimum disturbance.

Automatic Fire Extinguisher Having Flammable Pipes Inserted in a Cultural Assets Roof (가연성 파이프 시공에 의한 전통가옥지붕에 매설된 자동소화장치)

  • Cho, Taejun;Kim, Jae-Jun
    • The magazine of the Korean Society for Advanced Composite Structures
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    • v.5 no.2
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    • pp.26-31
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    • 2014
  • This invention is purposed to provide an innovative solution for the inside of roof structures, which is cultural assets. The Asian old houses generally have several layered roofs on top of the structures. If a fire has started inside of the roof, it is hard to be extinguished before eliminating all the upper layers of the roof. This invention provides pre constructed embedded pipes, which is flammable and easy to be dissolved by the fire. The material of pipe is composed of rubbers, of which the combustion point is so low that the extinguishing of initial fire is possible without additional fire service. The inside of pipe is filled with halon gas. If the filled gas is consumed after ignited by fire, additional fire extinguishing water is supplied. If the flexible pipes are totally combusted by a big fire, the sprinkler at the end of inflexible pipe will work continuously, which is located between flexible and inflexible pipes. The extinguishing pipe network is suggested as dividing whole roof as multiple sections for a swift fire extinguishing in case of intentional or natural fire attack to our invaluable cultural assets.

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Experimental Performance Evaluation of a Fire System for Apartment Buildings (공동주택 전용화재시스템의 성능평가를 위한 실험적 연구)

  • Jung, Jong-Jin;Hong, A-Reum;Son, Bong-Sei
    • Fire Science and Engineering
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    • v.29 no.6
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    • pp.51-56
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    • 2015
  • In Korea, measures to maintain sustainable fire safety performance for apartment buildings are insufficient in terms of fire-fighting products, skilled personnel, and maintenance status. Also, because of the particular features of a fire compartment, it has structural problems that are very likely to cause damage to human life when a fire occurs. Currently, problems with the fire supervisory system installed in an apartment building cannot be checked in real time, so it is difficult to identify the location of a fire accurately. Protected areas are also not assigned to each household, and residents cannot be clearly informed of the occurrence of a fire. As a consequence, safety evacuation cannot be secured. In addition, it is impossible to test the operation performance for water detectors in sprinkler fire extinguishing systems outside of the household. Therefore, an experiment was conducted to evaluate the performance of a remote fire supervisory system. The results show that the system satisfies all performance requirements. Also, an household alarm system was installed in each household to alert of any occurrence of a fire accurately, and the performance of the alarm system was improved to ensure that residents were quickly evacuated.