Research On Tower Crane Collision Risk Management In Construction Engineering Group Tower Operation

Group tower operations are often found in large-scale construction sites,with many people involved in the construction,the number of tower cranes,the difficulty of construction,the collision of operation,the complexity of the site,and the large scale of demolition and construction.The tower crane construction is a high-altitude operation.The center of gravity of the personnel is higher(generally more than 30m);most of the objects that the tower crane is working at work are heavy objects,and the lateral and vertical dynamic loads are very high;in order to ensure the construction progress and work efficiency,the tower crane operation makes the work rotate.The speed is mostly fast,and various phenomena indicate that the safety hazard of the tower crane operation is extremely high,especially in the more complex and varied environment of the tower construction,the safety hazard is even more unpredictable.To this end,the safety of the tower crane during the operation of the tower must be guaranteed,otherwise it will lead to irresponsible and devastating consequences.How to ensure the safety of the operation,the first thing should be to prevent in advance,clarify the risk of operation,so as to solve the problem and seek the best risk management approach.Based on the existing research and data collection,the paper deeply studies the regional possibility of tower crane accidents in mainland China,and draws relevant geographical maps.The causes of the tower crane accidents and the types of consequences are statistically analyzed.Based on the 4M theory,the source of the accident occurred,the basic causes,the direct causes,the contact accidents,and the injury.The identification of the source of the tower crane accident was identified.15 people were identified as causes,15 devices were caused,and 13 operations were caused.And 12 management causes,combined with the construction principles and methods of the evaluation index system,constructed a risk assessment index system for tower crane collision accidents.The evaluation indicators considered in the thesis are all qualitative indicators.It is necessary to use the expert scoring to quantify the indicators.The expert opinions have the priority.The method of modifying the G1 method based on the complex power function is used to weight 55 evaluation indicators,and the objective vector sum is used.The compound power function is used to correct the subjective initial vector,and then the modified G1 method index weight is obtained.The risk evaluation value of each tower crane is determined by means of weighted summation.Based on Fisher's optimal segmentation principle,the risk of tower crane collision accident is graded.The optimal classification number of tower crane collision risk accident is 5 by data fitting,which divides the risk of tower crane collision into5 grades.They are “low risk”,“low risk”,“medium risk”,“high risk” and “veryhigh risk”.The risk level of each tower crane collision accident is determined according to the classification criteria of each level.By measuring the risk cost of 55 indicators,the paper sorts out the risk loss,risk avoidance cost,risk mitigation cost and risk transfer cost of each tower crane;defines risk risk acceptance,risk transfer degree,risk mitigation degree and risk aversion degree.Evaluate the feasibility of each risk countermeasure;construct a risk countermeasure optimization model based on the feasibility of the risk strategy,and optimize the risk response strategy of each tower crane through the operation on the Lingo platform.The thesis selects the group tower operation of Yingheyuan Residential District in Gansu Province as the research object,conducts risk management research on the potential collision accidents during the construction of the tower crane,and obtains the risk evaluation results and risk countermeasures of 16 tower cranes.T1,T4,T9,T10,and T12 are low-level risks.Except that T9's risk countermeasures are self-retaining,all others choose risk transfer countermeasures;T7,T11,and T16 are moderate risks,and risk countermeasures are risk transfer;T3,T5,T6,T8,T14,and T15 are high risks.Among them,T8's risk countermeasures are mitigation and the rest are risk transfers;T13 is extremely high risk,and risk countermeasures are avoidance.Through comparative analysis,it is found that the results of risk assessment and risk countermeasures are mutually corroborating,which proves the feasibility of constructing models and methods in the paper.