With the development of society and the continuous advancement of urbanization, the number of buildings is gradually increasing, the scale is gradually expanding, and the function is gradually expanding, which makes t...With the development of society and the continuous advancement of urbanization, the number of buildings is gradually increasing, the scale is gradually expanding, and the function is gradually expanding, which makes the lightning protection and grounding operation in electrical installation more and more important. This paper expounds the grounding system of electrical equipment in intelligent building, including working grounding, lightning protection grounding, low-voltage distribution system grounding, safety grounding, anti-static grounding and shielding grounding, so as to optimize the design and reasonable grounding of intelligent building.展开更多
In recent years, with the development of economy, the development of Construction in China has also improved. With the rapid development of social economy and the reduction of urban construction land, it is inevitable...In recent years, with the development of economy, the development of Construction in China has also improved. With the rapid development of social economy and the reduction of urban construction land, it is inevitable that there will be a large number of skyscrapers, and a large number of electronic equipment will be installed during the construction. Because of the intelligent characteristics of the comprehensive building, its utilization rate is much higher than that of the traditional building. Therefore, the construction of electrical engineering and land protection requirements are higher. In order to minimize safety risks and create a good living and working environment for users, construction techniques must be strictly controlled during electronic installation and related installations must be properly managed. In addition, there is a need to protect the earth and improve the electrical safety of electromechanical equipment in high-rise buildings.展开更多
Building intelligent weak current system contains a large number of electronic equipment, which generally has low insulation strength and poor voltage tolerance, and is easy to be damaged in case of lightning weather....Building intelligent weak current system contains a large number of electronic equipment, which generally has low insulation strength and poor voltage tolerance, and is easy to be damaged in case of lightning weather. In order to improve the safety and stability of building intelligent weak current system, this paper analyzes the lightning protection technology of intelligent weak current system.展开更多
So many potential risks can be identifed for application of trenchless technology especially using microtunneling methods.Unexpected changes in ground conditions,such as encountering boulders,tree roots,ground water a...So many potential risks can be identifed for application of trenchless technology especially using microtunneling methods.Unexpected changes in ground conditions,such as encountering boulders,tree roots,ground water and man-made structures such as old foundations are the principal geotechnical risks,which affect the selection of an appropriate microtunnel boring machine.On the other hand,the performance of each microtunneling technique will differ while encountering such conditions.Hence,predicting the potential hazards provides a better safety and risk management plan.In this study,a couple of potentially hazardous situation,which are commonly associated with ground conditions,were identifed and investigated.A decision tree aid methodology was proposed based on geotechnical risk assessment for selection of proper microtunneling technique.Based on the approach the most appropriate microtunneling technique has the minimum risk level either before or after hazards mitigation measures.In order to check the effciency of the approach in practice,selection of microtunnel boring machine for Hamadan sewerage pipeline project was evaluated.Accordingly,an earth pressure balance(EPB)MTBM was selected for the project.展开更多
As 2006 unfolds, China plans to transform its economic development mode to usher in a new era of innovation. The National Conference on Science and Technology, held this month, provides a fresh impetus to that endeavo...As 2006 unfolds, China plans to transform its economic development mode to usher in a new era of innovation. The National Conference on Science and Technology, held this month, provides a fresh impetus to that endeavor. The strategy of "enhancing展开更多
文摘With the development of society and the continuous advancement of urbanization, the number of buildings is gradually increasing, the scale is gradually expanding, and the function is gradually expanding, which makes the lightning protection and grounding operation in electrical installation more and more important. This paper expounds the grounding system of electrical equipment in intelligent building, including working grounding, lightning protection grounding, low-voltage distribution system grounding, safety grounding, anti-static grounding and shielding grounding, so as to optimize the design and reasonable grounding of intelligent building.
文摘In recent years, with the development of economy, the development of Construction in China has also improved. With the rapid development of social economy and the reduction of urban construction land, it is inevitable that there will be a large number of skyscrapers, and a large number of electronic equipment will be installed during the construction. Because of the intelligent characteristics of the comprehensive building, its utilization rate is much higher than that of the traditional building. Therefore, the construction of electrical engineering and land protection requirements are higher. In order to minimize safety risks and create a good living and working environment for users, construction techniques must be strictly controlled during electronic installation and related installations must be properly managed. In addition, there is a need to protect the earth and improve the electrical safety of electromechanical equipment in high-rise buildings.
文摘Building intelligent weak current system contains a large number of electronic equipment, which generally has low insulation strength and poor voltage tolerance, and is easy to be damaged in case of lightning weather. In order to improve the safety and stability of building intelligent weak current system, this paper analyzes the lightning protection technology of intelligent weak current system.
文摘So many potential risks can be identifed for application of trenchless technology especially using microtunneling methods.Unexpected changes in ground conditions,such as encountering boulders,tree roots,ground water and man-made structures such as old foundations are the principal geotechnical risks,which affect the selection of an appropriate microtunnel boring machine.On the other hand,the performance of each microtunneling technique will differ while encountering such conditions.Hence,predicting the potential hazards provides a better safety and risk management plan.In this study,a couple of potentially hazardous situation,which are commonly associated with ground conditions,were identifed and investigated.A decision tree aid methodology was proposed based on geotechnical risk assessment for selection of proper microtunneling technique.Based on the approach the most appropriate microtunneling technique has the minimum risk level either before or after hazards mitigation measures.In order to check the effciency of the approach in practice,selection of microtunnel boring machine for Hamadan sewerage pipeline project was evaluated.Accordingly,an earth pressure balance(EPB)MTBM was selected for the project.
文摘As 2006 unfolds, China plans to transform its economic development mode to usher in a new era of innovation. The National Conference on Science and Technology, held this month, provides a fresh impetus to that endeavor. The strategy of "enhancing
