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March/April 2023 issue

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Management
Construction
IOSH News

High-rise construction site workers ‘risking their lives’ by ignoring evacuation alarms

Open-access content Wednesday 4th September 2019
From the archive:  Just so you know, this article is more than 3 years old.

Rather than head straight for the emergency exit, a third of workers who took part in evacuation trials spent more than a minute finishing a task, with the longest time to respond to an alarm being almost six minutes.

And once they completed their task, a quarter undertook four or more other activities, such as collecting tools, prior to starting to evacuate -- decisions which can waste critical seconds in a real-life emergency.

Researchers from the University of Greenwich, funded by IOSH, also found that more than two in five needed their supervisors to instruct them to leave the site, while many believed their employers viewed it more important than they did to complete tasks before evacuating.

The IOSH-published research, called Construction site evacuation safety: evacuation strategies for tall construction sites marks the first time the behaviour and performance of construction site workers during an evacuation has been analysed. It comes as there are a huge number of high-rise buildings being constructed, with an estimated 541 planned in London alone in the coming years.

Two London construction sites took part in the research, with the aim of judging construction site workers' evacuation knowledge and seeing how emergency strategies can be improved by reviewing evacuation response times for workers together with their walking and ascent/descent speeds.

In four full-scale unannounced evacuation trials, involving a total 932 workers, evacuation times from the buildings ranged from nine minutes, 14 seconds to 20 minutes, 47 seconds. These depended on the number of workers involved and what height they were at.

The researchers found that workers located within the formworks of a building respond to an alarm differently to those in the main building. The mean time to respond to an alarm for workers in the main building was 71 seconds while in the formworks it can be as low as 30 seconds.

They found that 32 per cent of workers in the main building took more than a minute to "disengage from their pre-alarm activities". In contrast, the average time for supervisors located in the formworks to disengage was only 5.9 seconds, which, according to the report, was "an example of the performance of well-trained and highly-motivated staff".

Responses to a questionnaire distributed among workers also highlighted some other concerns. While 82 per cent knew that an evacuation alarm meant they had to leave immediately, only 49 per cent said their first action is to do so.

Four in five said they were prompted by an alarm, but video evidence taken during trial evacuations at the site suggested 43 per cent required supervisor intervention.

In their report, the researchers speculate that workers may not be reacting quickly enough because they aren't clear what is meant by "evacuate immediately". They recommend enhanced training and greater enforcement of evacuation policies to remedy this.

Professor Ed Galea, who headed up the research team in the Fire Safety Engineering Group at the University of Greenwich, said: "In an emergency evacuation situation, each second can make the difference between life and death. A delayed response poses a significant risk to the health and safety of workers who might need to be evacuated due to a fire, or another on-site emergency.

"One unexpected finding was that workers were not impacted by construction height. This means that people on higher floors and those on lower floors had similar response times. A worker on the 30th floor did not necessary respond to an evacuation alarm any quicker than a worker on the fourth floor.

"This research shows that it is essential to have robust plans in place to ensure the safe and timely evacuation of workers, and it will aid the development of improved procedures and advance the safety of people working on high-rise construction sites."

Martin Wilshire, multiplex health and safety director, said: "The research undertaken by Ed Galea and his team on our high-rise projects has highlighted the importance of challenging established industry 'norms' and their origins in creating relevant guidance around safety during tall building construction.

"From our involvement in this work, we have gained a greater understanding of evacuee behaviour and the impact of access constraints such as falsework and surfaces under construction which are unique to our industry. The detail in the research will better inform our approach to risk assessments, particularly in planning for means of escape and improving behaviours in an evacuation scenario."

Duncan Spencer, head of advice and practice at IOSH, said: "The outcomes from the research will help to improve the safety of construction workers in emergency evacuation when operating in tall building construction environments, by providing a series of suggested improvements and recommendations to be followed by businesses and safety and health practitioners.

"From the research, it is clear that these improvements are needed considering that this is one of the most challenging scenarios particularly given the ever-changing nature of the construction site. Response times are slow in many cases. Workers should be evacuating immediately when they hear an alarm, rather than wasting precious seconds on finishing a task. If they don't do so, they are risking their lives because every second counts in an emergency."

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