Identification of hazards and analysis of the root causes of construction accidents using the Bow-tie_FMEA Compound Technique (Case Study: Tehran Technical Building Company)

Construction industry is known as one of most dangerous industries which incidents occurrence rate is high because of work nature complexity and also unsafe workplaces. Therefor construction jobs are categorized in most dangerous and most full of incident jobs in world.

In this article technical buildings company of Tehran construction projects known as Khaneh-Shahr and Helal existing hazards have been recognized using checklist and then evaluated and assessed using FMEA risk assessment method. Additionally, critical points technique in order to identify and determine construction projects critical risks has been used and also modeled in the form of bowtie using Bowtie Pro 3.3 software in last phase.

Results have shown that Khaneh-Shahr construction project has 7 critical risks from totally 14 assessed risks and also Helal construction project have 8 critical risks from totally 15 assessed risks which have been modeled separately. Furthur mobile crane reversal risk in Khaneh-Shahr construction project and metal-concrete structures crash with equipment, workers and high voltage electricity cables in Helal construction project with RPNs of 420 and 490 respectively, considered as most significant critical risks.

It could be concluded there is posiibility to use risk assessment and incident modeling techniques in combined and analizing incident root causes and probable consequences in construction industries using Bowtie analysis method besides.