One of the challenges with construction is determining how your work can and will affect the existing conditions surrounding your job site. That’s why it’s increasingly important to not only perform proper due diligence procedures, but also react to the findings. That, unfortunately, doesn’t always happen and could potentially be what caused a massive sinkhole in Fukuoka, Japan, last week.
Around 5:15am local time, a 98 foot (30m) by 88 foot (27m) section of roadway was completely swallowed by a sinkhole. As crews were working on an underground subway line directly beneath the road, groundwater began to flow into the tunnel, according to the Asahi Shimbun. Shortly after, the road above began to collapse, exposing a flowing sewer line under the pavement. Luckily, no injuries were reported, but hundreds of residents and businesses were without power or gas, as the nearby utilities were compromised. Due to fear of the sinkhole growing, city officials ordered the hole to be filled in later that afternoon.
Perhaps even more astonishing, repairs have been made to all the utilities and the pavement in a week’s time, as the road was opened back up to the public on November 15th. After the hole was filled in, it only took crews 48 hours to repair the utilities and re-pave the roads, according to CNN. The 50 foot (15m) deep hole took roughly 8,100 cubic yards (6,200 cubic meters) of a sand and cement mixture, which the mayor of Fukuoka says is now 30 times stronger than before, reported the Guardian.
The video below was uploaded to Youtube by ODN:
Since it opened its doors in 2010, the Burj Khalifa has been the world’s tallest building, one of the most coveted titles in all of the construction industry. If all goes according to plan, the Burj’s reign at the top will come to an end when Saudi Arabia’s Jeddah Tower is completed in 2020.
A nearby office worker caught video of a dramatic demolition that showed the remains of an 11 story building collapse on top of the excavator performing the demolition.
Strange things are found on job sites across the globe all the time. We’ve shared plenty of stories in the past about the odd things construction workers have discovered, like human remains, 200,000 year old mammoth bones, ancient roman treasure, and more. When contractors dig in the dirt, there’s always a chance of uncovering history. Sometimes, though, the things found can be extremely dangerous.
In order to get the bad taste of last week’s botched demolition, in which an adjacent building also got destroyed in the process, we needed to share a highly successful one. Priestly Demolition, a Canadian demolition contractor, has been the subject of our articles in the past and the company has even won awards for the best demolition in the world.
While placing concrete on the second floor of a future seven-story mixed use building in Oakland, California, the concrete forms suddenly gave way, sending around 20 workers 10 to 15 feet below with the wet concrete. News reports explain the job site went into a panic, understandably so, and co-workers rushed to the scene to help.
Mistakes during demolitions happen. Sometimes contractors knock down the wrong buildings, other times the explosives used don’t knock the building over, and other demolitions are carried out with a complete lack of regard for human life. As fun as they are to perform and watch, they’re inherently dangerous and there should be a plan in place in case things go wrong.
Cranes collapse for a variety of different reasons. Some are overloaded, some catch on fire, and others succumb to high wind loads. Regardless of the reason, a falling crane can cause tons of damage and have the potential to kill on-site workers and pedestrians walking near the job site.
A recent crawler crane collapse in Northern Italy could have been much worse as the crane, carrying a large section of viaduct, crashed to the ground.
Construction Junkie has shared a lot of demolition videos. Typically, people line up waiting for the moment when the building explodes with their eyes peeled and cameras ready, just waiting for the perfect video. This video, however, is much different.
Doing something in the name of revenge typically is never a good idea. Concrete truck operators getting involved with that revenge is probably an even worse idea. But, anger makes people do weird things, including video taping said revenge.
As harmless as it looks, dirt can be one of the biggest hazards on any construction site. It’s heavy and is bound to collapse without warning unless proper safety measures are taken into account. Landslides are essentially no different than trench collapses, without proper shoring or sloping, you could be putting worker’s lives in danger.