Study On The Risk Management Of Construction In Long-distance Pipeline Horizontal Directional Drilling Crossing Project

It was only about two decades that horizontal directional drilling crossing was introduced into China as a type of trenchless technology, which was rapidly developed in this period. But risk assessments on these projects are still few. The paper introduced a large-scale gas pipeline project with large amount investment and serious risk; the risk assessment prior to project construction is necessary. Because the segment of large and middle traversing and span in the crude oil pipeline is a complex large system. many factors are fuzzy to evaluate in the process of risk evaluation. In order to enhance the precision of the results of analysis and evaluation and improve the instruct value for practical produce. there is a uniform evaluation criterion for every risk accident and risk factor. Therefore, we should build mathematics evaluation model for fuzzy factors using fuzzy mathematics theory in the process of risk analysis and evaluation. In order to evaluate the status of fuzzy factors impersonally, we adopt the method of specialist investigation to evaluate some factors.The dissertation is mainly take CPP (China Petroleum Pipeline Bureau) as an example. We do the modeling based on the basic concept of risk analysis and we do the reliability analysis and risk analysis of pipe laying system. With the qualitative and quantitative analysis we discuss the security risk analysis methods of horizontal directional drilling crossing project. Firstly index system was established based on the project evaluation by the experts, then the synthesis of advantages of fuzzy comprehensive evaluation method and AHP(analytical hierarchy process) was adopted and according to the evaluation data, risk value of the project Was obtained and the corresponding conclusions was drawn. In the risk evaluation process of some material object, the risk values of every risk factor, show the size of risk exponent. It is also basic gists for risk management and risk control. So the risk values of every tache. The risk factor should be computed after the analysis and determination of every risk factor risk probability of risk accident and risk aftereffect. The dissertation presents quantity method of risk scores on the basis of grade criterion of uncertainty risk factors. Finally, Establish the risk assessment system for Henan Zhongmu XX Horizontal Directional Drilling Crossing Project, and propose preventive measures.