Study On Construction Safety Control Of H Bridge Blasting.Demolition Project

With the rapid development of China’s economy in recent decades,the original built Bridges need to be dismantled and rebuilt due to reasons such as exceeding the designed service life,serious damage to the bridge structure and the original design factors that do not meet the current traffic needs.In demolition engineering,blasting demolition has become the preferred construction method because of its advantages of high efficiency and low cost.However,due to the complex environment,greater social impact and higher construction safety requirements of blasting demolition engineering,safety control becomes particularly important in selecting blasting construction scheme and construction.This thesis takes the demolition project of H Bridge as an example,starts from the perspective of the construction unit of the bridge demolition project,uses the method of grounded theory,and obtains the initial text data through literature retrieval and in-depth interviews with personnel from three parties of the demolition project.The initial text data is imported into NVIVO software and combined with the status quo of blasting engineering to carry out three-level coding,analyze and identify the problems existing in the construction safety process of bridge blasting demolition engineering and the influencing factors of its construction safety.On this basis,questionnaire survey and expert score were carried out to construct fuzzy correlation matrix.The fuzzy membership function is selected to calculate the fuzzy correlation intensity matrix.The threshold value was determined,the adjacency matrix was derived,the reachable matrix was calculated and decomposed by MATLAB software,the system skeleton matrix was determined,and the multi-step directed graph of the model was drawn.Fuzzy interpretative structural Model was constructed to analyze the results,and the control strategies were proposed for the key factors of construction safety control.This study is helpful to improve the construction safety influencing factor system of bridge blasting demolition engineering,find out the key points of risk control for the construction safety of bridge blasting demolition engineering,and provide reference for the construction safety control of the same bridge structure blasting demolition engineering in the future.