Steel rebar, the world’s favorite reinforcement material for concrete, greatly increases tensile strength in concrete. Due to concrete’s rigidness and tendency to shrink and expand, reinforcement is necessary in many cases to reduce cracking and slow structural failure. This material is elementary to most of throughout the construction industry, but what you may not be familiar with is how much stress steel rebar must be under before it completely snaps in half.
Gav and Dan, also known as The Slow Mo Guys, have amassed a huge youtube audience simply by filming awesome things, mostly exploding, in super slow motion. Their most recent video shows what it looks like when a piece of #11 grade 60 steel rebar, which measures 1.41 in (35.81mm) in diameter, is put under enough force to completely snap it in half. The force is measured in kips, which the guys called “pulling apart force” (technical term), one of which equals 1000 pounds-force.
The experiment, which was filmed at the University of Purdue’s College of Engineering, showed that it took 157.401 kip of force, or 157,401 pounds of force, before the rebar broke. Watching the footage slowed down to 28,000 frames per second (fps) and again at 148,000fps allows you to see the millions of steel particles that explode into the air as the steel breaks.
Residents living near a Jersey City, New Jersey construction site were frightened as they watched “explosions” of smoke coming out of holes in the ground.
For almost 80 years, the Old Kosciuszko Bridge connected Brooklyn and Queens in New York. Much like many other bridges its age, it is being replaced due to capacity issues and deterioration. When it was completed in 1939, it was built for 10,000 cars per day. Unfortunately for the people who needed to use that bridge that past few decades, around 180,000 cars used it.
Smaller heavy construction equipment is the most likely to be stolen on a jobsite, but most of the time the thieves try to sell the equipment for money. On rare occasions, the thief just takes the machine out on the town for a joy ride and leading the police on some pretty frustrating pursuits. Early last year, a man in Florida stole a backhoe and lead police on a wild 3 hour chase as the hammer attachment drug along the asphalt throwing sparks the whole way. Just last week, police dash cam footage showed an 18 year old backing over a police cruiser, with an officer still inside, and then leading several other officers on a slow chase.
As we saw after the Lake Oroville Dam in California collapsed earlier this year, dam failures can have sudden and devastating effects. Recent footage showing raging muddy waters swallowing a construction site in a matter of seconds has been shared after river dam in Thatom, Loas failed.
Hurricane Irma ripped through the Caribbean and landed in South Florida a little over a week ago, sadly killing at least 50 people in Florida and causing plenty of property damage. High winds that accompanied the storm also caused the collapse of 3 construction cranes – two in Miami and one more in Fort Lauderdale. The crane in Fort Lauderdale was recently dismantled and the action was caught on video.
As if the high winds and heavy rains weren’t enough of a safety hazard for the people of Florida, citizens who are staying in the area also need to be concerned about the dozens of tower cranes that are still erected throughout downtown.
New demolition videos are always fun to watch. You know what’s even better, though? A bunch of demolitions all at once.
While being prepared for demolition, the Grand Avenue Bridge in Glenwood Springs, Colorado unexpectedly collapsed to the railroad tracks below. Thankfully, no injuries were reported, but the local police chief said that workers had to flee the scene once the bridge section started to fall.
If this video of construction worker’s chasing down an alleged tool thief and hanging onto the hood of his car wasn’t enough to convince you to not mess with construction worker’s things, then maybe this new video will be. Construction worker’s tools and trucks are their livelihoods, and they don’t take too kindly to people who don’t understand that.
Directional boring, or horizontal directional drilling, is a common method for installing underground pipe and conduits, among others. Its main benefit is that it minimally disturbs the areas around where your pipe or cable needs to be installed. Instead of cutting concrete, asphalt, or ripping up landscaping, the boring machine digs a tunnel underground and the installing material slides in after it’s complete.
That’s what it’s SUPPOSED to do anyway.