• Title/Summary/Keyword: Explosive demolition

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Arrangement of Agent Holes for Enhancing Crack Propagation in Structure Demolition Process using Soundless Chemical Demolition Agents (무소음화학팽창제를 이용한 구조물 해체시 균열진전 촉진을 위한 천공홀의 배치)

  • Nam, Yunmin;Kim, Kyeongjin;Park, Sanghyun;Sohn, Dongwoo;Lee, Jaeha
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.28 no.6
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    • pp.683-690
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    • 2015
  • For demolition of offshore facilities, traditional methods such as jackhammer and explosive methods have been often used in construction industry. However, prohibitions for use of those methods are becoming more rigorous especially in environmentally and historically sensitive areas. It was also reported that the explosive demolition method on maritime bedrock can cause a disturbance of ecosystem. For those reasons, use of soundless chemical demolition agent(SCDA) is getting the spotlight. However, researches regarding the mechanical point of SCDA have seldom performed. There is no industrial standard for use of SCDA yet. In this study, a pilot experimental study in order to measure the required expansive pressure that could be generated from SCDA was conducted. Numerical models were developed in order to estimate the required expansive pressures of SCDA for initiating cracks depending on selected key parameters. Obtained results indicate that the required pressure does not decrease linearly as increasing the hole diameter, the number of holes, and the ratio of hole-distance to hole-diameter.

Explosive Demolition of Structures (구조물의 폭파해체공법 소개)

  • 황현주;이성우;김상수;이광원
    • Computational Structural Engineering
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    • v.5 no.1
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    • pp.38-44
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    • 1992
  • 본 기사에서는 재래식 해체공법에 비해 보다 안전하고 신속하며, 경제적인 폭파해체공법을 간략하게 소개하였다. 폭파해체공법은 구조역학적인 기술과 화약기술을 종합한 매우 정교한 제어해체 기술로써 앞으로 발생되는 해체, 철거공사에 많이 이용될 것으로 예상된다.

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Case Study of Explosive Demolition of Concrete Well Structure (광진교의 우물통 기초 발파철거 사례분석)

  • 두준기
    • Explosives and Blasting
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    • v.19 no.1
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    • pp.19-30
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    • 2001
  • 본 논문에서는 수상구간의 우물통 기초 철거공법을 약액(팽탕성 과괴제) 주임공법에서 발파공법으로 변경하여 공사기간을 단축시키면서도 주변의 보안물건에 대한 공해를 발생시키지 않고 안전하게 공사하여 원가를 절감한 사례를 중심으로 발파공법을 고찰하였다.

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A Case of Shell Structure Demolition Using Explosives (Shell 구조물의 발파해체 사례)

  • Song, Young-Suk;Jeong, Min-Su
    • Explosives and Blasting
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    • v.29 no.2
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    • pp.67-80
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    • 2011
  • Recently, the number of structure demolitions has increased in both civil and architecture fields due to various reasons such as redevelopment of a city, utilization of sites and restoration of deteriorated structures. In the past, domestic shell structures had been constructed with brick masonry and they were not high. Therefore, their demolition had been executed with ease. Recently, however, taller reinforced concrete shell structures have become a target for the destruction. Under these circumstances, how to efficiently demolish a structure and how to minimize effects of the destruction on environment including vibration and noise have become a main issue. One of the possible solutions is the explosive demolition. In this study, a case of explosives demolition of the stack, which is located in Jeju Thermal Power Plant in Republic of Korea and is 70 m tall, is addressed. In order to fall down the structure against the desired direction, 13.5 kg dynamite and 100 electric detonators were used.

A Study of Cutting Method of H-Pile for Explosive Demolition of SRC Structure (철골구조물 발파해체를 위한 H형강 절단방법에 대한 연구)

  • Min Hyung-Dong;Lee Yun-Jae;Song Young-Suk;Kim Hyo-Jin
    • Explosives and Blasting
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    • v.23 no.3
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    • pp.83-89
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    • 2005
  • It follows in deterioration of the steel frame structure and becomes remodeling and removal. The construction work characteristic, economical efficiency and stability environment characteristic are planned and considered hereafter control plan of the steel frame structure which is deteriorated currently to cutting mettled plentifully sued on gas cutting of H beam. However it will not be able to apply from the explosives demolition which is makes a weak instantaneously and then collapses the building at the time. In this study, shape charge was used for cutting of the H-beam. That is the element testing to estimate explosives demolition for steel frame structure. As a result, it is found for single-side rutting method, both-sides rutting methods by H-beam thickness and pre-rutting process. It confirmed an affix method and an ease characteristic by fixing tool. Also, it is shown that air blasting decreased about 8dB(A) in order to reduce air blasting used by sand box. However, it will be required to reduce air blasting little more because explosives demolition will be done in urban site.

A Study of Explosive Jet-cutting Technology by Linear Shape Charges (성형폭약에 의한 폭발절단기술에 관한 연구)

  • 이병일;박근순;공창식;김광태
    • Tunnel and Underground Space
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    • v.10 no.4
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    • pp.516-525
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    • 2000
  • Recently, the demand for pollution-free demolition work of old reinforced concrete and steel structure has rapidly increased as the redevelopment of urban area has been accelerated. This study deals with linear shape charges for explosive jet cutting on steel structure. We have tested material and shape of steel structure, characteristics of thickness and strength, shape of linear shape charges, type of shape charges, cumulative charges, type of liner, stand-off distance, detonation method. effect of sound and vibration by air blast in explosive jet cutting method. So, We developed linear shape charges in order to take advantage of optimum explosive jet cutting condition. Shape charges were made of PETN explosives. We obtained the experimental formula to decide the amount of explosive needed for thickness of steel structure plate. There are prospects for application of the explosion curving technology under the open space conditions for dismantling the steel structure and steel bridge, scrapped old boats, which are going out of service.

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A Case Study of Explosive Demolition of Apartment and Underground Structures (성남 하대원 주공 아파트 및 화정 지하구조물 발파해체 사례분석)

  • 이천식;이윤재;김형섭
    • Explosives and Blasting
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    • v.19 no.3
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    • pp.75-89
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    • 2001
  • 아파트 재건축을 위해 발파해체공법을 이용하여 실시한 5층 아파트 9개동의 시공사례를 중심으로 국내 아파트 발파해체에 따른 경제적 공법의 제시와 시공되어진 해체구조물의 현황과 공법, 사전처리 공법등을 소개하고 또한, 지상구조물이 아닌 지하구조물의 해체를 위한 콘크리트의 부분 발파사례를 통하여 해체 분야의 발전 방안을 고찰하였다.

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Prediction of the Minimum Required Pressure of Soundless Chemical Demolition Agents for Plain Concrete Demolition (무근콘크리트 해체시 무소음화학팽창제의 최소요구팽창압 예측)

  • Kim, Kyeongjin;Cho, Hwangki;Sohn, Dongwoo;Koo, Jaehyun;Lee, Jaeha
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.31 no.5
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    • pp.251-258
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    • 2018
  • In construction site, conventional methods such as jackhammer or explosive methods(dynamite) have been often used for the demolition of structures. Use of those methods are more carefully treated in environmentally and historically sensitive area. For those reasons, use of Soundless Chemical Demolition Agent(SCDA) is getting the spotlight. The SCDA is a powder which has expansive strength when it is mixed with water. In these Characteristics, SCDA can destroy the concrete or rock as it is poured into boreholes of the concrete or rock structures. However, there is no industrial standard for the use of SCDA effectively yet. In this study, experimental study to measure the expansive pressure was conducted depending on various boundary conditions such as waterproof, length of the steel pipe, submerged of steel pipe. Furthermore, computational analysis using damage plasticity model to predict the minimum required pressure of the SCDA for the concrete demolition depending on spacing between holes(k-factor) and compressive strength of the concrete was conducted. Obtained results indicates that water heat dissipation with submerged steel pipe shows the stable pressure for measuring the SCDA and hole distance(k-factor) is the most important factor for crack initiation of concrete.

Numerical Analysis of Collapse Behavior in Industrial Stack Explosive Demolition (산업용 연돌 발파해체에서 붕괴거동에 관한 수치해석적 연구)

  • Pu-Reun Jeon;Gyeong-Jo Min;Daisuke Fukuda;Hoon Park;Chul-Gi Suk;Tae-Hyeob Song;Kyong-Pil Jang;Sang-Ho Cho
    • Explosives and Blasting
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    • v.41 no.3
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    • pp.62-72
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    • 2023
  • The aging of plant structures due to industrialization in the 1970s has increased the demand for blast demolition. While blasting can reduce exposure to environmental pollution by shortening the demolition period, improper blasting design and construction plans pose significant safety risks. Thus, it is vital to consider optimal blasting demolition conditions and other factors through collapse behavior simulation. This study utilizes a 3-D combined finite-discrete element method (FDEM) code-based 3-D DFPA to simulate the collapse of a chimney structure in a thermal power plant in Seocheon, South Korea. The collapse behavior from the numerical simulation is compared to the actual structure collapse, and the numerical simulation result presents good agreement with the actual building demolition. Additionally, various numerical simulations have been conducted on the chimney models to analyze the impact of the duct size in the pre-weakening area. The no-duct, duct, and double-area duct models were compared in terms of crack pattern and history of Z-axis displacement. The findings show that the elapse-time for demolition decreases as the area of the duct increases, causing collapse to occur quickly by increasing the load-bearing area.

Collapse Simulations of High-Rise RC Building Using ELS Software and Application of Explosive Demolition Methods to Transition Process Analysis from Local Damage to Progressive Collapse (ELS를 이용한 고층 RC 빌딩의 붕괴해석 및 발파해체해석 기법의 국부손상-연쇄붕괴 전이과정 해석에 응용)

  • Kim, Hyon-Soo;Park, Hoon;Kim, Seung-Kon;Lee, Yeon-Gyu;Cho, Sang-Ho
    • Explosives and Blasting
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    • v.29 no.2
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    • pp.1-12
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    • 2011
  • Progressive collapse analyses of high-rise buildings subjected to abnormal loading such as fires, impacts, earthquakes, typhoon, bomb blasts etc. are intended. However it is difficult to perform collapse experiments of the real scale building to determine the capacity of the structure under an extreme loading events. In this study, collapse behavior of a 15 story RC structure building loaded by external explosion pressures were simulated using Extreme Loading Structures (ELS) software. The standoff distance between the RC building and explosives of 1500 kg was 1, 2, 5, 10, and 15 meters. The explosive demolition analysis techniques based on removal of partial support structures following blast scenario was adapted to investigate the transition process of progressive collapse-local damage.