• Title, Summary, Keyword: Applied Explosives

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On the explosive demolition technology of construction building CDI, USA (미국 CDI사의 건축물 발파해체 기법)

  • 장병하
    • Explosives and Blasting
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    • v.13 no.4
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    • pp.73-81
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    • 1995
  • Explosives demolition mothod is allowed for more efficient time-saving and safer demolitioni operations as compared to conventional / mechanical demolition methods. CDI has to minimize the effects of noise, dust and various demolition hazards to the public areas, and residences that are located adjacent to the project site. CDI's explosives demolition work on the Nam san Foreigner's Apartment Complex and chosun trading Co's factory are backed by over 45 years of explosives experience in the demolition of over 6,000 structures worldwide, many of these structures are similar to the Nam san Foreigner's Apt. and Chosun trading's factory in construction and proximity to sensitive adjacent exposures. Recoginized worldwide as the founder of the leader in explosives demolitioni technology, CDI always will applied "State-of-the-Art" explosives techniques to safely and successfully achieve the desired demolition results on these project. CDI has never injured, much less caused any fatality, to either a worker on one of our sites or to a third party during the implosion of high-rise structure.

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A Case Study on Explosives Demolition of Central Library (중앙 도서관 발파해체 시공사례)

  • Park, Keun-Soon;Kim, Sang-Hoon
    • Explosives and Blasting
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    • v.26 no.2
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    • pp.77-91
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    • 2008
  • According as demand for superannuated building increases recently, much researches about demolition method of construction are going on. This case study executed to center library building located in Dankook University. Explosives demolition method applied Progressive Collapse. Explosives demolition main blasting floors are 2, 4floor, assistance blasting floor is 1 floor. In the nearest distance (150 m), Vibration measurement result were 0.0302 cm/sec (PPV). Change was not in measurement value is crack gauge which install beforehand.

The Mixed Charging Method with Low-velocity Explosives and Normal Explosives in Tunnel Blasting (터널 발파에서의 저폭속폭약과 일반폭약의 혼용장약법)

  • Kang, Dae-Woo;Ahn, Bong-Do
    • Tunnel and Underground Space
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    • v.20 no.4
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    • pp.252-259
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    • 2010
  • In urban tunnels, namely, in case there are residents in the near distance, we normally use non-vibration and ambient vibration which are not blasting methods because it’ impossible to meet the blasting vibration regulation with only normal explosives. However, non-vibration methods not only cause increase of excavating cost, but need much time than explosives. Generally, the lower velocity explosives with 2,000 m/s VOD have been applied to ambient vibration blasting in open cut area, but difficult in tunneling in its use. However, by charging the hole together with lower velocity explosives and normal explosives, we have got the result which shows 20~30% vibration decrease compared with using only normal explosives. Therefore, I’ like to suggest the blasting method which is able to do as ambient vibration using lower velocity explosives mixed with normal explosives in urban tunnel and the area which is adjacent to security facilities within the vibration regulation.

A Study of the Safe Measure Industrial Explosives (화약산업의 발파안전대책 - 소음진동 및 안전거리 설정을 중심으로 -)

  • Ahn Myung Seok
    • Explosives and Blasting
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    • v.9 no.4
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    • pp.13-21
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    • 1991
  • This study is concerned with the disasters that occure in the field of industrial explosives and analyzed by two side the disaster of the manufacturing factory and that of the field, and is studied about the safety and the countermeasure. The industrial explosives accidents occure just accidentaly and unforeseeable, and reappearance experiments are more difficult. The 3E of J.H. Harvey was applied in this study to establish the counter measure of preventation of accidents, overcoming these restricted factores. As a method of technical safety countermeasures. The blasting vibration formula which had been conformed from the Seoul Subway Construction work during 1980-1984 year, was uilized, and, using the formula $V=Kw^{0.5}D^{-1.5}$ for the gneiss which is widely distributed in Pusan area, an index of the minimum and maximum amount of gun powder, to be used according to safety distance was made, and it helped the gun powder managing technician's practical business. During the fore work discharging, the safety distances of felling were theoretically established based on the writer ${\diagdown}s$ experiences of more than 10 years on this field.

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Theoretical calculation of the parameters influencing on the performance of high explosives (고성능폭약의 성능에 영향을 미치는 요소들의 이론적 계산)

  • 권상기
    • Tunnel and Underground Space
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    • v.10 no.2
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    • pp.218-226
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    • 2000
  • In order to determine the performance of an explosive, various parameters such as the detonation pressure, detonation velocity, heat generation, and fume generation of the explosive should be accurately described. In this study, the pressure increase, volume expansion, temperature increase, and detonation velocity of high explosives were tried to determined theoretically based on thermochemical theories. From this study, a Fortran program for calculating the explosion parameters, which can influence on the performance of explosives, was developed and applied to the high-explosives, ANFO and NG.

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Research on Effective Scientific Investigation Methods with Regards to Explosion Accidents (폭발사고시 효과적인 과학수사 방법에 관한 연구)

  • Jun, Sang-Gun;Chae, Jong-Min
    • Journal of forensic and investigative science
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    • v.1 no.1
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    • pp.72-87
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    • 2006
  • Accidents and terrorist acts that utilize explosives have a great influence on society and thus require a prompt investigation for the arrest of the culprit. However, such investigations are often met with difficulties due to the vastness of the crime scene, restrictions on approaching the scene, fragility of the evidence, complexity of investigation, and the lack of expertise. In spite of such facts, scientific investigation regarding explosives have not been widely studied in Korea. Therefore, the focus of this research primarily concerns the effective scientific investigation methods in cases of accidents that involve chemical explosives. Although the a systematic investigation method is at the heart of scientific investigation in cases of explosive accidents, it is only at its rudimentary stage. Therefore, in this research, a systematic investigation method is put forth for the 'scene investigation, the documentation of the scene, and the collection and processing of evidence. Further, I have set forth a 'scene investigation check list' the ensure a thorough scene investigation and to promote an exhaustive evidence collection that would guarantee the admissibility of such evidence in court. The above efforts were aimed at simplifying the currently complicated investigation system. 1) In the future, a guidebook that can be generally applied to accidents involving explosives in Korea ught to be produced, a continual systematic education and integrated training excises for investigators ought to be established, laws that require additives in explosives ought to be instituted so that the type, components, and source of explosives can be identified, and lastly, a database that contain information on former explosion accidents, trends, and techniques of criminal activities that involve explosion accidents should be compiled.

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A Case Study on Explosives Demolition of the Dongdaemoon Complex Stadium(Baseball field) in Republic of Korea (동대문 운동장(야구장) 발파해체 시험시공 사례)

  • Min, Hyung-Dong;Park, Jong-Ho;Song, Young-Suk;Seo, Young-Su;Kim, Rea-Hoe;Jung, Byeong-Ho
    • Explosives and Blasting
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    • v.26 no.1
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    • pp.23-37
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    • 2008
  • The Dongdaemoon complex stadium is scheduled to remodelled into an international park, which will be named Design Plaza. The Dongdaemoon baseball field was constructed with Rahmen Structure which comprised beams, slabs and columns. In order to assure for viewing, the stadium was composed unusual structure that the height of the front column and the back column was designed differently. The bleachers was an upper arch form for viewing. The slab was not flat unliked the general infrastructure and tilted in stairway type for viewing. If we had applied the mechanical demolition method, we could have predicted several problems. Firstly, the stand could be unstable when the heavy equipment was to crush the reinforced concrete on the slab. Because the slab was not flat. Secondly, the construction expense and construction duration could be increase when the large equipment was to crush the reinforced concrete on the ground. Because the height of the stand was too high to crush on the ground so it needed to build a filling. Thus, we applied both the mechanical demolition method and explosives demolition method at the design stage. The result of explosives demolition was of complete success in terms of structural movement and controlled blasting noise and vibration. This case study provided a good example for a successful application of explosives demolition in urban areas.

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.

New Austrian Tunneling Method (일본의 NATM시공)

  • Toyoki Kadoya
    • Explosives and Blasting
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    • v.9 no.4
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    • pp.22-31
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    • 1991
  • NATM technic had been applied to Nakaya tunnel of Sin kan express R.R lines in 1975. on the worst expandable geological conditions, application of NATM method was carried out good result. Measurement data which include convergencymeter, inclinometer, extensometor load-cell, strain gage data of shotcrete stress and steel arch. was explained with slides. Induced NATM technic has been improved since 1975 as follows, specially adhesive method of shotcrete instead of spray method such as tunnel swift lining Sliding press lining, clean lining by pumping and sweeping tote lining ets.

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A Case of Application-blasting in the Urban Blasting Works (도심지 터파기를 위한 응용발파 시공 사례)

  • Kim, Taihyun;Park, Yongwon;Cho, Raehun;Kim, Hongyool;Jeong, Byungho
    • Explosives and Blasting
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    • v.34 no.2
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    • pp.18-30
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    • 2016
  • A drill & blasting method using explosives is the most efficient way to break the rock in the urban projects. However, the blasting method cause vibration, noise and fly-rock as blast pollutions so that blasting wroks are restricted by adjacent structures such as apartment and residence houses. To conduct blasting works at near structures, the numbers of blast-holes a blast and the size of the blast are limited by kinds of detonators and initiation methods. So, the production rate is reduced and the construction period should be increased. Therefore, in this case the deck-charge blasting methods using available detonators in domestic market were designed and evaluated in order to confirm the application possibilities in specific urban sites.