The bridge was built on the river, why is it not afraid of collapse?

Because these bridges have been scientifically calculated, built with solid materials, and have a very thick foundation, they generally do not collapse.

Because the bridge was built very strongly, no matter how much weight it had, it basically would not collapse.

The main reason is that building a bridge will actually lay a certain foundation, and it will find a support point for the force, so it will not collapse.

The purpose of river bridge construction is to connect the two banks of the river, so that the two banks can communicate conveniently and quickly, and the horizontal construction is in line with the purpose of bridge construction.

That way the distance is a little shorter, and the cost is a little lower.

<> China's Hong Kong-Zhuhai-Macao Bridge was built for nearly 10 years, from the end of 2009 to October 2018 before it was put into use, the purpose is to connect Zhuhai, Hong Kong and Macao, take advantage of regional advantages, and accelerate the development of the regional economy. Although it is full of helplessness, it is also a blessing in disguise and has achieved world-class Made in China.

Today we are going to talk about the Quebec Bridge, which had two accidents during the construction process alone, and even took 88 lives. In 1850, Canada planned to build a bridge over the St. Lawrence River, but with the technical level at that time, it was really difficult, because the narrowest part of the river reached a kilometer, the depth was more than 50 meters, and the water flow was fast, with an average of 14 kilometers per hour.

In order to successfully build, ** found one of the industry's most authoritative engineer Theodore Cooper, when Cooper was nearly 60 years old, although the experience of building bridges, but when I saw the map of the St. Lawrence River and both banks, I still came to the interest at once, the higher the difficulty of the project, the more Cooper's desire to win, once the bridge was completed, then its span was more than 500 meters longer than the world's longest British Forth Bridge at that time, as long as the project was completed, it will inevitably draw a strong stroke in the final career.

During the bidding process, the Phoenix Bridge Company directly won the list, intending to use a cantilever structure similar to the balance to build a long-span bridge, with a cheap ** to build a high-quality bridge, the main span of the Quebec Bridge at the beginning of the design is meters, Cooper took into account many factors and decided to increase to meters, so that it can shorten the construction period of nearly 1 year, and the most important thing is that it can exceed the British Forth Bridge.

At the time of construction, Cooper basically did not go to the site, let alone have technical guidance, it is precisely because of this irresponsible work attitude, for the collapse of the bridge laid the bane, and the steel bearing capacity he gave is far from the actual situation, so accompanied by a loud bang, 75 people died under the torrent of steel bars, and Cooper is undoubtedly the main person responsible for the accident, the collapse of the Quebec bridge, to the last career smeared a big black spot at the same time, It also left him in the shadow of the accident for the rest of his life.

But speaking of which, the story is not over, Canada ** still does not give up, continue to find someone to build the Quebec Bridge, in the last mistake, this time the construction seems to be extra careful, but even so, still failed to avoid the accident, because the corrective measures exceeded the actual situation, the stressed part of the new bridge had a problem, directly fractured, 5200 tons of steel fell into the water, 13 workers also died, and finally in the third attempt, taking 88 lives, the bridge was officially completed in 1917.

The two collapses of the bridge, which caused the loss of nearly 90 lives, can be regarded as a catastrophe.

The construction of the bridge collapsed twice, and some of the people on the bridge were rescued, and some unfortunately passed away, so the construction of the bridge must be strict and careful, and the "tofu scum project" cannot be tolerated.

The people on the bridge were rescued after the accident, and after that the bridge was cordoned off and no one could walk up it.

Strong egoism at work :

1.Research department: China's technological research has reached the international advanced level, but in China, "science" and "engineering" are separated, technical research is for personal honor, research is not for the purpose of serving the society.

As a result, high-paying technology research has become the mainstream of today's research, ignoring the redevelopment of simple technologies.

2.Technical department: China is not without technical talents, but under the condition of no supervision, technical talents do not play their due technical level, tired or not, resulting in a big pot of rice psychology.

4.Government Organs: (1) In order to pursue personal achievements, the local **** does not consider factors such as construction technology and construction conditions, but only pursues.

The construction period of the opening of traffic, which leads to the insufficient curing period of concrete, and the unsuitable conditions of the lead workers in Shibutan.

2) Supervision is insufficient, and law enforcement agencies are not enforcing their rights for people's livelihood. After the accident, in the perpetrators.

When they shirk responsibility for each other, they don't get to the bottom of it. Most of them have adopted the policy of turning big things into small things.

5.Democratic public opinion: The people are also responsible, and they do not supervise various departments in a timely manner, and they have nothing to do with themselves, as can be seen in the case of thieves on the bus.

Additions are welcome.

The professional quality of construction and design personnel is not improving.

The piers of the river bridge should not only be hit to the bottom of the river, but also crossed the bottom of the river and hit the "hard" foundation.

The general construction method is to use the "cofferdam method", that is, to build a "cofferdam" where the bridge piers need to be built, and then the water in the "cofferdam" is pumped clean, and then it is the same as the method of building bridge piers on land.

For deep-water bridge foundations, bored piles are generally used. Deep-water water boreholes, generally using boats. The rig is fixed to the ship, and the ship is held in place by giant anchors and cables.

After setting the drilling position according to the measurement, sink into the steel casing, play the role of positioning and isolating seawater, and then go down into the drilling tool, drill into a hole, the hole forming process generally adopts mud wall protection, after the hole is formed, the reinforcement cage is lowered, the underwater concrete is poured to form a high pile, and then the high pile bearing cap construction is carried out, and the water pier becomes.

How were the piers of the sea-crossing bridge built?

Under normal circumstances, there is safety protection without accidents, and it can not be ruled out by self-release.

Because the safety measures of Huashan Cableway are very good, unless it is artificial, there is basically no problem.

Although it is said to be the most dangerous bridge, it does not mean that it is not safe. The security measures are certainly in place.

Look at the danger, but the more you look at the dangerous bridge passing by, the more careful you are, and you will not have an accident easily.

The absence of accidents has a lot to do with the daily inspection and maintenance by local managers.

The safety measures of Huashan Changkong Plank Road are quite good, and you have to register your identity when you go to play, and then whether you have a history of heart disease, children can't play, so there will be basically no accidents.

I think there are sufficient security measures in place, and the entrance has undergone a strict physical examination.