Friday, June 2, 2023

What was the reason for the collapse of the Tapiola Crash Bridge? – “I think that’s true …”

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The Accident Investigation Center investigates the Tapiola Footbridge accident at two levels.

The Accident Investigation Center (Otkes) aims to explain in the coming weeks what was wrong with the temporary footbridge in Tapiola, what factors caused the bridge to collapse and what kind of load the bridge should have been able to withstand.

Read more: This is all we know about Crash Bridge – it had to be able to withstand such a heavy load

– This type of technical investigation is very fast. The investigation goes much deeper as we explore the different processes and principles involved, how temporary footbridges are built, the materials the parts are made of, and what the practices and laws are. It takes from half a year to a year, says Kai Valonen, a leading researcher of paranormal phenomena.

Read more: HS: Preliminary assessment of the causes of the Espoo bridge accident – ​​warns other construction sites too

According to Valonen, it is already known that two transverse beams of the bridge fell from their supports when a group of school children were walking on the bridge. The plywood walkways of the bridge collapsed along with the beams. The ends of the fallen transverse beams had bracket parts that showed damage and bending. However, supporters of the crossbar persist.

Why did this happen? Otkes is investigating this. Otks holds the two transverse beams of the bridge.

– We have inspected the accident spot and talked to people. In addition, we have requested documents and staging instructions and have created an investigation plan. Let’s keep it going, Valonen says.

A group of 39 first graders and six teachers were on the bridge when the bridge gave way. If the average weight of a first grader is 60 kg and that of an adult is 80 kg, then the bridge was subjected to a load of slightly more than 3,000 kg.

The base of the temporary pedestrian bridge at Tapiola collapsed over the entire width of the bridge and onto the road.

The base of the temporary pedestrian bridge at Tapiola collapsed over the entire width of the bridge and onto the road. Photo: Jussi Nukari / Lehtikuva

Jarno Turi, CEO of Renta Telenine, which built the bridge, had previously said that the bridge was designed to withstand a maximum load of 500 kg per square metre.

– If you think about how many students fit in one square meter, the truth seems to be that the bridge could not withstand 500 kg per square meter, Valonen thinks.

– And if we talk about the possibility of jumping and bouncing on the bridge, then this is completely allowed and normal. The bridge has to be designed in such a way that it can withstand such a thing, Valonen continues.

Tuuri says that Renta Telenit will also conduct its own investigation into the incident and report it to the authorities.

– We deliver documents to the authorities. I am not going to speculate on them, says Turi, but I am sure the authorities will be able to find out the reasons that led to the accident.

The bridge accident is being investigated by the police, the Accident Investigation Center and the Regional Administrative Agency.

The bridge accident is being investigated by the police, the Accident Investigation Center and the Regional Administrative Agency. Photo: Jussi Nukari / Lehtikuva

Turey has strongly denied rumors that homemade tuning forks were used in the brackets or fasteners of the collapsed pedestrian bridge in Tapiola.

– All racks were manufacturer’s parts. We do not have sites where we make our own rack parts or use our own tuning. We buy all parts from manufacturers and we only use parts from manufacturers, Turi emphasizes.

Turi says that if officials look back and find out what happened, they will have a look at how to prevent this type of accident from happening again.

– We’re still very sorry. We want to ensure that such an incident does not happen again at any construction site under any circumstances,” says Turi.

Police is also conducting technical investigation of the accident. At this stage of investigation the offenses are causing injury and danger. The police will keep the progress of its investigation in front of the public on Tuesday.

The temporary pedestrian bridge crossing the Itatuulenkuja in Tapiola in Espoo collapsed on Thursday of last week. A total of 23 students and a teacher had to be hospitalized due to fractures in their arms and legs, among other things.

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