• Title/Summary/Keyword: Explosive demolition

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A Case Study of RC Rahmen Structure Explosives Demolition (Focusing Demolition at Chungang Department in Daejeon City) (RC 라멘조 발파해체 적용사례와 기술.경제적 성과분석 -대전 중앙데파트 발파해체사례를 중심으로-)

  • Jung, Min-Su;Song, Young-Suk;Park, Yun-Seok;Heo, Eui-Haeng
    • Explosives and Blasting
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    • v.28 no.2
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    • pp.99-107
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    • 2010
  • Domestic explosive demolition techniques have been developed and applied for low-rise structures up to now. However, the demand for the development of those techniques that can be applied economically, safely and environment-friendly rapidly increases because the old high-rise RC rahmen structures that were built since around 1970s are now required to rebuild. As a result, element technologies of explosive demolition for low-rise structures were applied to take advantage of technology in high-rise structures that performed application testing at Chungang Department demolition field in Daejeon city. It could judge elements technology establishment for high-rise structure demolition and field application and suggest the improvements when the problems occurred to develop High-rise building demolition techniques for method of protection a field test and the dust reduction test. The water cannon test was applied to reduce the dust site and the drilling tests are performed to select the best components for explosives demolition elements techniques of the reliability. This paper shows that we have the ability to remove a high-rise building using environmentally friendly safe and economical explosives demolition method. It would contribute to prevent a foreign company from entering the domestic market and should contribute to acquire competitiveness of domestic demolition industry.

A Case Study on Explosive Demolition of Turbine Building of Steel Frame Structure (터빈동 철골구조물 발파해체 시공사례)

  • Hoon, Park;Sung-Woo, Nam;You-Song, Noh;Chul-Gi, Suk
    • Explosives and Blasting
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    • v.40 no.4
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    • pp.35-46
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    • 2022
  • While the construction of dismantling the old industrial complex and restoring the dismantled industrial site to its original natural environment the is underway. In this paper, we introduce a case of dismantling a turbine building which one of the a large steel frame structures in an old industrial complex by applying the progressive collapse method among the blasting demolition methods. We used a charge container that generates a metal jet to cut dismantling the turbine building. The thickness of the steel structure was adjusted to 30 mm or less by applying gouging, which was a method of digging deep grooves by gas and oxygen flames or arc thermal, in the part where the cutting thickness was thick in the blasting section. The total amount of charge used for the blasting of turbine building was 175 kg, 165 electronic detonators and 124 charge containers. As a result of the blasting demolition, the turbine building was collapsed precisely according to the estimated direction. The blasting demolition was completed without causing any damage to the surrounding facilities.

A Demolition Experiment of a Scaled Model for a Concrete Box Girder Bridge (콘크리트 박스거더 교량의 발파해체를 위한 교량모형 해체실험)

  • Yang, Hyung-Sik;Jang, Hyong-Doo;Ko, Young-Hun
    • Tunnel and Underground Space
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    • v.21 no.2
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    • pp.103-108
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    • 2011
  • Along with series of concrete block experiments, a demolition experiment was conducted for a scaled concrete box girder bridge to investigate collapse and blast behavior. Tri nitro toluene (TNT), the standard explosive for strength was adopted as concussion charge. The result show that demolition was caused by not only direct detonation pressures at charging spots but also blast pressures at inner wall of concrete box girder.

Development of Charging Container for Cutting Steel Plate and Evaluation of its Cutting Performance (강재 절단을 위한 장약용기의 개발과 절단 성능 평가)

  • Park, Hoon;Min, Gyeong-Jo;Cho, Sang-Ho;Suk, Chul-Gi
    • Explosives and Blasting
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    • v.36 no.2
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    • pp.10-18
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    • 2018
  • The shaped charge is used in explosive demolition of steel frame structure, but it was often not used because it was limited to use or impossible to supply at domestic and foreign. To solve this problem, we needed a device that could generate matal jets using industrial explosive. In this study, we made a charging container, which metal jets were generated when explosives were detonated. Cutting performance tests were carried out to evaluate the effect of cutting of a charging container on a steel plate of 25mm thickness. In addition, we compared the results between the numerical simulation of penetration process and cutting performance tests and then was evaluated a cutting performance for steel plates of 35mm and 70mm thickness.

The Influences of Additives and Curing Temperature on the Expansion Pressure of Calcium Oxide Hydration (생석회의 팽창압 발현에 미치는 첨가제 및 양생온도의 영향)

  • Kim, Won-Ki;Soh, Jeong-Soeb;Kim, Hoon-Sang;Kim, Hong-Joo;Lee, Won-Jun;Shin, Jin-Ho
    • Journal of the Korean Ceramic Society
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    • v.44 no.9
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    • pp.529-535
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    • 2007
  • Calcium oxide has been used as a demolition agent in fracturing rocks and old concrete structures, etc. With the agent, demolition work can be done in safety without a noise, vibration and any other pollution, since high expansive pressure is obtained gradually by only mixing the agents with water and pouring the slurry into boreholes. But application of the non-explosive demolition agent is a time-consuming job, especially in winter. Essentially, this problem is related to the reaction rate of calcium oxide with water. This study examines the influence of additives such as cement and anhydrite on expansion pressure of calcium oxide at different curing temperatures. The expansion pressure of calcium oxide began to increase steadily with the rise of the curing temperature. When mixing calcium oxide alone with water, blown-out shot occurred. But as additives were added to calcium oxide, the reaction of calcium oxide delayed and the expansion pressure showed gradual increment. Especially, anhydrite showed a superior delaying effect than cement on the reaction of calcium oxide.

Review of the History of Vibration Controlled Blasting Method and its Future Applicability (진동제어발파공법의 변천과정과 적용 전망에 관한 연구)

  • Ahn, Myung-Seog;Shin, Chang-Yong
    • Explosives and Blasting
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    • v.27 no.1
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    • pp.53-61
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    • 2009
  • R.O.K's explosive manufacturing source was first black powder (B.P) introduced into Korea Dynasty from China. In 1890, black powder was first used for mining blasting in Masan. Nowadays, a vibration control blasting method using the emulsion explosive has been applid to explosive demolition of building structure, subway and road construction sites. In December, 2006, Korean Government and professional society (KSEE) established the blasting guidelines of Modern Vibration Controlled Blasting Method (MVCBM) which is an unprecedented in the world.