• Explosives and Blasting
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• v.21 no.3
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• pp.49-60
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• 2003

Nowadays it is tendency to make a remodelling or demolition of old structures with the rapid development of blasting technique. In this treatise it is arranged of improvement procedure of blasting demolition method in korea which was begun since August 1991. Recently, the blasting demolition method has much merits with 60-70% reduction effect of construction period than mechanical demolition method. and so that it has much economical points specially over than 5 storied high buildings. In order to maximalize economical effects of the blasting demolition method, environment safety and recycling, it must be needed. at first to develop the estimating programs against vibration, noise, flying stones, and dust. Also it is required to take a responsibility for using recycling materials after blasting demolition of old structures, and to be invested to advance the blasting demolition techniques.

• Explosives and Blasting
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• v.20 no.3
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• pp.83-96
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• 2002

Reconstruction and redevelopment of old and dilapidated apartment and housing have been increasing to provide more housing accommodation and to secure the safety of building structures since the middle of 1990's. Since, however, little researches on the demolition technique have been made, conventional mechanical demolition method were applied to the most of works that resulted in flooding in small demolition companies. Problems associated with mechanical demolition method are increase not only in working days and costs, but also in public claims, particularly for high-rise building structures. This is to contribute the demolition industries bt providing the concept, standards, and technique of demolition engineering while maximizing working efficiency and minimizing public claims.

• 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.

• Tunnel and Underground Space
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• v.19 no.5
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• pp.397-406
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• 2009

Recently, the number of industrial structures that must be demolished due to structural deterioration and unsatisfactory functional conditions has been increased. To minimize environmental hazardous factors created during the process of demolition, the explosive demolition method has been applied increasingly. This execution case was intended to describe an application of the explosive demolition method to the demolition of a Crusher & Screen structure, which was a large-section reinforced concrete special structure. It was deemed necessary due to its structural deterioration and unsatisfactory functional condition. Various pre-weakening processes and blasting patterns were applied to the large-section reinforced concrete members, and to reduce blasting vibration and impact vibration, time intervals were established for blasting in the same column and for blasting between blasting blocks. By applying the explosive demolition method to the demolition of a large-section reinforced concrete special structure, the explosive demolition was completed safely and efficiently, without causing any damage to surrounding facilities.

• Explosives and Blasting
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• v.22 no.3
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• pp.43-55
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• 2004

Use term of tower style construction exceeds recently. Accordingly, according to construction safety diagnosis result, achieve removal or Improvement construction. But when work removal, must shorten shut down time. Therefore, removal method of construction to use blasting demolition of construction is very profitable. Influence construction and equipment by blasting vibration and occurrence vibration caused by felling impact. Is using disadvantageous machine removal method of construction by and economic performance by effect of such vibartion. Therefore, this research studied techniques to forecast vibartion level happened at blasting demolition and vibration reduction techniques by use a scaled model test.

• 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.

• Tunnel and Underground Space
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• v.19 no.3
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• pp.190-202
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• 2009

With the increasing demand for blasting demolition in urban areas, the simulation of structural collapse prior to the real blasting operation is a key process for ensuring the success and safety of the blasting demolition. The simulation of collapsing behavior of a structure is not only vital for preventing unexpected economic loss and casualties, but also helpful in minimizing public claims by precisely estimating the environmental impact resulting from the operation. This study proposes a new technique for simulation of a blast demolition using FEM based LS-DYNA codes. The technique tries to simplify the complex arrangement of reinforcing bars, and use the actual properties of the concrete and steel reinforcing bars, thereby improving the overall capability of the simulation to match well with the collapsing behavior of real-scale structures.

• Explosives and Blasting
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• v.40 no.3
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• pp.66-76
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• 2022

Recently, the demand for the dismantling of old industrial complexes has been increasing, and the construction of restoring the dismantled industries to their original natural environment is underway. In this case, the felling method was applied to the explosive demolition method to dismantle a large steel frame structure in an old industrial complex. We used a charging container to cut the steel frame structure that generates a metal jet. The thickness of the thick steel structure in the blasting section was controlled by gouging which a method of digging deep groove by gas and oxygen flame or arc thermal. As a result of the explosive demolition, the steel frame structure collapsed precisely according to the estimated direction. The explosive demolition was completed without causing any damage to the surrounding facilities.

• Explosives and Blasting
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• v.40 no.2
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• pp.15-24
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• 2022

Recently, the demand of demolition for the unnecessary industrial structure is increasing due to deterioration tendency and the issue of demolition is becoming a major highlight. The restoration of the dismantled industrial site to its original natural state was currently underway. This execution case was intented to describe an application of the felling method one of the explosive demolition method to the demolition of the industrial stack. This stack was 150m high, a composite structure in which the outer wall of the stack was a reinforced concrete shell structure and internal stovepipe was a steel shell structure. As as result of the explosive demolition, the stack had collapsed precisely according to estimated direction. And the explosive demolition was completed without causing any damage to surrounding facilities.

• 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.