Tower Crane Collapse Accident Risk Assessment And Countermeasures

According to related statistics, the annual number of deaths of national construction industry and the industry has a high number of deaths, including lifting machinery accident caused accounted for about 16, ranked first in all of the mechanical casualties. Injury accidents in all mechanical equipment, crane injury is one of the most obvious, the number of deaths caused by tower crane accidents about hoisting machinery and equipment of all deaths caused by 30. All kinds of tower crane tower crane collapse accident injuries, often caused by the collapse of the tower crane tower body fracture or boom, this type of tower crane accidents often happen in the installation process, operation process, attached to the wall of the jacking process and disassemble process of tower crane collapse accident occurred; the huge losses, often cause casualties, property and very bad impact on public opinion. As can be seen, in the process of the development of the construction industry and the industry, has important social significance to prevention of the tower crane accident, in the tower crane safety management, to prevent the need to pay special attention to the crane collapse.In this paper, based on the system safety theory, safety design, the construction project construction process, summarized has carried on the analysis and the case may lead to dangerous source of mechanical crane collapse. The hazard identification, risk assessment as the basis for the core, risk countermeasure to supplement, in the analysis of risk identification and evaluation of the existing methods at home and abroad, put forward the method for tower crane collapse accident risk assessment, this method refers to the decision tree, and through the transformation of the decision tree, the collapse the accident risk pre assessment of the target of tower crane.This paper first introduces the process of analysis and risk analysis method and the definition and characteristics of project risk; then the factors that could cause the crane collapse of the mechanical analysis and summarize the construction of tower crane in the use process, find out the six dangerous and harmful factors; and then focus on the use of thehazard degree of the risk factors of decision tree. After a quantitative analysis, the tower crane collapse accident risk analysis model. The improved decision tree, the results from the model and the probability to calculate state point, then according to the actual situation of the set a threshold, compared with the state point value, the greater than the threshold value of the branch to retain control, as a key object is less than the threshold, the branch deletion. Finally,may lead to a variety of risk factors for the occurrence of tower crane collapse accident, put forward specific measures to reduce the risk of.In this paper, the model has been proved by an example of real is a kind of suitable for tower crane collapse risk analysis method, its characteristic value is convenient, simple,intuitive and clear. Popularization and application of this method will be significant economic benefit and good social impact, help improve the quality of tower crane operation safety management level in our country, also for the building construction units, government management department and relevant decision-making departments to provide technical support.