落墩中央分隔带施工安全风险评估研究

Research on the construction safety risk assessment of the central separate belt with pier

传统的桥梁施工安全风险评估方法在易用性和系统性方面存在缺陷,而且忽视了动态交通带来的风险。以新建常祁高速公路G72分离桥为依托,通过量化施工风险指标和交通风险指标,对传统LEC评价法进行改进;运用作业分解结构−风险分解结构和层次分析法对该桥进行风险评估。研究结果表明:该桥可分解为4个分项工程和18个单位作业,按照HSE风险管理模式,确定了17个风险指标;将作业指标和风险指标形成耦合矩阵,确定了192处风险源,Ⅲ级以上风险源14处;通过层次分析法得到了Ⅲ级以上风险的单位作业7处和分项工程1处,该桥梁总的风险度为171.8,属于Ⅲ级风险;并从交通组织与安全防护两方面提出落墩中分带上跨高速公路项目的施工风险管控措施,可为类似的工程提供了理论和实践借鉴。

The traditional bridge construction risk evaluation method has defects in user-friendliness and systematicness,and ignores dynamic traffic risks.This paper is based on the research conducted on the newly built G72 Separation Bridge of Chang-Qi Expressway,in which the traditional LEC Method is improved by quantifying the construction risk index and traffic risk index,and the risk of this bridge is evaluated comprehensively by the use of WBS-RBS and AHP.The results show that the bridge can be divided into 4 sub projects and 18 unit operations,and 17 risk indicators are identified in accordance with the HSE risk management model;192 risk sources are determined by coupling operation index and risk index,among which 14 are above levelⅢ;Through the analytic hierarchy process,7 unit operations and 1 sub-divisional project with risks above levelⅢare obtained,and the total risk of the bridge is 171.8,which is also a levelⅢrisk.Finally,construction risk management and control measures are proposed from the aspects of traffic organization and safety protection,which provides theoretical and practical guidance for similar projects.