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（5）专家评议法也称定性评议法或综合评议法,评标委员会根据预先确定的评审内容,如报价、工期、技术方案和质量等方面，对各投标文件共同分项进行定性分析和比较。通过评议，选择投标文件在各指标都较优良者为候选中标人，也可以用表决的方式确定候选中标人．这种方法实际上是定性的优选法。
通过使用这些安全评价方法进行危险源辨识之后，就可对施工过程中的安全管理方面提出各类安全可行的建议措施[2]。
关键字： 大跨度桥梁；危险源辨识；LEC法；事故树法；安全施工组织设计Bridge organization construction of a specialty design
Abstract: into the 21st century, along with the rapid development of social economy in our country, the traffic infrastructure construction and development has been accelerated. Bridge engineering in our country present "leapfrog development", in the large span and large span bridge construction, at 1088m Extra-long bridge, 560 meters large span Bridge such as bridge specialty such as represented by a group of world-class Bridges were built. Urban transformation, high-speed propulsion and large-scale construction of highway has also made the number of small and medium-sized Bridges exponentially.
With the rapid development of bridge construction for construction safety problem has become an important subject of our research. Major bridge construction safety accidents in our country in recent years, for example, FU Nan county of ours county of ours province in 2007 dike creek bridge especially serious collapse, "8.13" because of the bridge main arch ring masonry material did not meet the specifications and design requirements, arch bridge superstructure construction process is unreasonable, poor quality of the main arch ring lining, reduce the intensity of the integrity of arch ring masonry and, with the load increasing, arch caused hole near the main arch ring 0 1 side abutment of about 3 to 4 m wide range, namely 2 abdomen arch under the arch foot section collapse of masonry strength to destroy limit and, influenced by continuous arch effect, the entire bridge collapse rapidly. Killed 64 people, four people seriously injured, 18 people were slightly injured; Chongqing Wu long lotus river bridge in 2008 "10.28" accident, 23 workers take a wire basket on the late shift, because the hanging basket wire rope fracture, manned skip fall on the deck, killed nine people, on his way to the hospital killed 2 people, injured 12 people （5 of them seriously. Similarly, in recent years, the construction safety accident occurred frequently, not only caused huge economic losses, and also to the people's work life and personal security pose a serious threat.
Therefore, to improve the quality of bridge construction safety management is imminent. This article first appeared in the process of a specialty in domestic bridge construction safety accident hidden danger status identification, based on hazard identification in the process of construction to analyze it with the method of system safety analysis, this paper adopted the LEC evaluation method, accident tree method, safety inspection table, fault type and impact analysis and expert evaluation method. Choose their reason is:
Operational conditions risk assessment LEC method （method） to evaluate people in a potentially dangerous operation environment for operation of dangerous degree, this method is simple, the dangerous degree of level pision is clear, eye-catching.
Fault tree method is one of the most important analysis methods in safety system engineering, it can risk identification and evaluation of various systems, not only can analyze the proximate cause of the accident and to reveal the deeply underlying causes of the accident. Use it to describe the accident causation intuitive, clear, clear thinking, strong logicality, as well as qualitative analysis, and quantitative analysis. Based on probabilities can be according to the path and assigned to the node; The scope of the results can be improved in the tree; Event tree from the reason to the result, conceptually easy to understand; Event tree is dependent on time; Event tree in the check system and human response to cause potential accident is ideal.