Why the Crimean Bridge wasn’t built using fast Chinese technology.

Why the Crimean Bridge wasn’t built using fast Chinese technology.

Yesterday I came across a heated discussion of the technical backwardness of Russia, where, among other arguments, an example of the construction of the Crimean bridge is given. They say that the Chinese are building huge bridges almost before our eyes, thanks to advanced bridge-laying technology, and our two and a half years entered the Kerch Strait.

talked about this bridgelayer
talked about this bridgelayer
talked about this bridgelayer

Moreover, many participants in the discussion agree with this argument.

Unfortunately, many people confuse a conventional transport bridge with a strategic structure. The first defenders of the Crimean bridge were not military structures, but designers, who laid a unique survivability in all structural elements.

Much has been said about the security system of the Crimean bridge in the media. Everything is really under control here, from space to the bottom of the Kerch Strait. They even control the activity of tectonic plates. In 2018, two artillery boats of the Ukrainian Navy tried to arrange a provocation, but could not even get close to the bridge.

With the military, everything is clear, but the design solutions for the security of the Crimean bridge are much more interesting. The largest elements of the bridge are the central spans over the fairway. Accordingly, first of all, you need to fence them from possible actions of enemies. Let me remind you: the length of the arches is 227 meters and the structure weighs 5.5 thousand tons.

The pillars of the central arch have a very strong pile foundation: 110 piles thick 1.5 meters filled with reinforced concrete. In addition, the piles are angled and in fact form a cone - the most durable figure. The cone has no weak points and no matter which side the destructive effect comes from. The approaches to the supports of the central arch are additionally protected by powerful bollards.

All these support elements create a single structure with a multiple safety factor. Any attempt to destroy the support of the central span by ramming the vessel will result in a huge hole in the side and shouts of "sinking!"

Why didn't the foundations of the other pillars of the bridge begin to do the same? This is where all the advantages of the constructive cunning of the Crimean bridge are revealed. Of course, it could be assembled from ready-made reinforced concrete elements. This design is both cheaper and quicker to assemble.

But then the foundations and the supports themselves would have to be made in the same way with a multiple reserve of power, because damage to any support leads to the destruction of two bridge spans at once. For saboteurs, this is the perfect target for an attack.

Therefore, the designers of the Crimean Bridge have chosen the whole-arch technology or, in scientific terms: "Continuous beam all-metal superstructure".

The structure of the bridge spans was assembled and built up from the side of the coast, and fell on the supports with a shift. When sliding, the span canvas reached the next support without deformations. The structure is so strong that it can easily support its weight even without support at the other end of the span.

The destruction of any intermediate support will not lead to the destruction of the bridge - the spans will remain in place.

Such a one-piece construction has a length of almost two kilometers there is a drawback: when the temperature changes, the metal changes size. In the heat, the metal expands, and in the cold it contracts. Moreover, this change in the length of the bridge is very significant - almost 1 meter! The designers turned this disadvantage in favor. The bridge leaf is not rigidly attached to the supports and can easily move in both directions. In the language of specialists, this is called "the construction breathes". However, the degree of freedom is limited by special shock transmitters:

They do not interfere with the "breathing" of the structure, but in the event of an earthquake or terrorist actions, the spans are instantly pulled to the supports. It turns out that shock transmitters for a bridge are like muscles for a person.

All these design tricks made it possible to build the most reliable strategic bridge in the earthquake zone.

Suddenly, who has not seen how the Chinese bridge-layer of reinforced concrete spans works:

Do not think that everything is so simple here. The video shows only a small spectacular part, and the entire "iceberg" of preparatory work was left behind the scenes.

Look back in TABLE OF CONTENTSmy channel, there are many interesting and useful articles.

  • Share:
Instagram story viewer