摘要 :
According to the fact that the blasting site is surrounded in three sides by buildings and one side by main street called Zhongshan Road, for the protection of the surrounding residential building, office building, all kinds of fa...
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According to the fact that the blasting site is surrounded in three sides by buildings and one side by main street called Zhongshan Road, for the protection of the surrounding residential building, office building, all kinds of facilities and underground pipeline, the prior cutting two parts and bidirectional folding blasting demolition project were taken in pulling down Harbin Longhai Building. Blasting cuts were designed respectively in floors 1 and 2, floors 4 and 5, floors 9 and 10. The collapse direction and ruins height were controlled through the reasonable design of blasting parameters and the key parts pretreatment In addition, the blasting parameters and the detonating network were optimized by test blasting before the demolition. The perfect blasting had achieved through some security measures such as drilling short-ship medicine and delay blasting technique for con-troling blasting vibration damping, pre-forming protection damping ditch for controlling buildings collapsing vibration, taking protective walls for controlling blasting flyrock, building sprinkling for controlling blasting dust and other security measures before the blasting and security checking after blasting.
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摘要 :
According to the fact that the blasting site is surrounded in three sides by buildings and one side by main street called Zhongshan Road, for the protection of the surrounding residential building, office building, all kinds of fa...
展开
According to the fact that the blasting site is surrounded in three sides by buildings and one side by main street called Zhongshan Road, for the protection of the surrounding residential building, office building, all kinds of facilities and underground pipeline, the prior cutting two parts and bidirectional folding blasting demolition project were taken in pulling down Harbin Longhai Building. Blasting cuts were designed respectively in floors 1 and 2, floors 4 and 5, floors 9 and 10. The collapse direction and ruins height were controlled through the reasonable design of blasting parameters and the key parts pretreatment In addition, the blasting parameters and the detonating network were optimized by test blasting before the demolition. The perfect blasting had achieved through some security measures such as drilling short-ship medicine and delay blasting technique for con-troling blasting vibration damping, pre-forming protection damping ditch for controlling buildings collapsing vibration, taking protective walls for controlling blasting flyrock, building sprinkling for controlling blasting dust and other security measures before the blasting and security checking after blasting.
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摘要 :
In November 2005, the nitrous unit of the aniline device of a chemical plant exploded and the damage was severe. We were invited to authenticate the explosion equivalent.
According to domestic and international related theories a...
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In November 2005, the nitrous unit of the aniline device of a chemical plant exploded and the damage was severe. We were invited to authenticate the explosion equivalent.
According to domestic and international related theories and technique methods, an investigation into the damage degree of explosion was made. Referring to relevant documents, corresponding high blast wave and intensity of vibration were obtained, and the related calculation was made; In consideration of the explosion and other related factors, blast accident equivalent was reckoned. After calculating the blast wave and the intensity of vibration, we reckoned the blast equivalent as 27.6～31.6 tons (TNT). A correct method was used to do the calculations from the two effects separately, which helped to guarantee the accuracy of the judgment about the blast equivalent and was considered as the initiative exploration of the judgment theory and the calculation techniques.
In the paper, we also approached the causes of the blast accident from mechanism. It was believed that the nitrobenzene met the strong acid in the course of adding materials and a violent chemical change occurred, thus causing the temperature inside the tower to go up continuously and exceed the range. The vaporization of the nitrobenzene was therefore aggravated. When meeting flames or high temperature, the blast occurred.
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摘要 :
The main air pollutants from power plants during the period of operation are SO_2?TSP and NOx. The power plants always emit large quantity of contaminants in the form of elevated point source and buoyant plume. A mathematical mode...
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The main air pollutants from power plants during the period of operation are SO_2?TSP and NOx. The power plants always emit large quantity of contaminants in the form of elevated point source and buoyant plume. A mathematical model should be constructed to study the spacial distribution of the pollutants and to provide a scientific basis for plant program and air pollution control. Based on a second generation air quality model(HPDM), this paper points out the limitations of HPDM and makes some improvements by comparisons between different models and checking computations. The results of many operational calculations show that the developed model can objectively predict the ground concentration distribution due to pollutants from elevated point source of power plant.
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摘要 :
The main air pollutants from power plants during the period of operation are SO_2?TSP and NOx. The power plants always emit large quantity of contaminants in the form of elevated point source and buoyant plume. A mathematical mode...
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The main air pollutants from power plants during the period of operation are SO_2?TSP and NOx. The power plants always emit large quantity of contaminants in the form of elevated point source and buoyant plume. A mathematical model should be constructed to study the spacial distribution of the pollutants and to provide a scientific basis for plant program and air pollution control. Based on a second generation air quality model(HPDM), this paper points out the limitations of HPDM and makes some improvements by comparisons between different models and checking computations. The results of many operational calculations show that the developed model can objectively predict the ground concentration distribution due to pollutants from elevated point source of power plant.
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