The construction cost of pile foundation accounts for a relatively high proportion of the construction cost of transmission line engineering.To study the influencing factors of pile foundation construction costs for transmission lines and the risk of cost overruns

combined with engineering practice experience

five factors affecting pile foundation construction costs were summarized

including human factors

mechanical equipment factors

material factors

environmental factors

and construction method factors.The secondary factors were further refined

and the degree of impact was quantified.By normalizing the calculation of weights

the risk of cost overruns is divided into three categories:key monitoring

secondary key monitoring

and general monitoring.Taking a certain transmission line project as an example

the factors affecting the cost of pile foundation construction were quantitatively evaluated through expert scoring method.The fuzzy comprehensive evaluation method was used to analyze the risk of cost overruns and identify key management factors.