Seventy-nine rivers open, eighty-nine swallows come, this saying in the folk saying, in the Xiaoice River era, is not so accurate, at least, the river has not opened yet.

Against a yellow and green background, the wilderness seemed so cold.

In the early spring weather, the hard-working farmers have already begun to work hard, and on the other side of the farmland, on a small river nearby, a huge construction site is under intense construction.

It is not a very large river, the width of the river, only about 8 meters, is the main source of water for the farmland on both banks, watering the surrounding land, and on the surface of the river, there is a simple wooden bridge itself, which provides convenient traffic conditions for the surroundings.

And now, a huge railway bridge has begun to be built here.

This is one of the fastest bridges, in fact, after the use of cement prefabricated parts, for some bridges of no more than 10 meters, the speed of construction is quite fast, as long as the foundation is completed, and then the concrete is poured, and then the cement prefabricated parts are sent over, and then transported to the top by crane.

It's almost like a child building blocks, building bridges together, with a reasonable mechanical balance in itself, plus the use of some adhesives, etc., so that they are strong enough to withstand the heavy weight of the railway.

It has only been a long time, and in half a month, the construction team has a total of 40 professionals, plus 200 workers hired from the surrounding area, to complete a huge amount of work, and the construction of the bottom has been basically completed, including the huge plinths excavated on both sides of the river.

According to mechanics, the fastest construction speed should be a single-hole arch bridge, because there is no need to dig in the river, and it is not so easy to build such things as piers, whether in this era or in the 21st century, in the middle of the river, excavation and construction of piers.

It was necessary to excavate an area of water isolation and then continue to dig down the river bottom before pouring reinforced concrete to form a solid pier.

The arch of the arch bridge has certain limitations, and later generations can even build dozens of kilometers, or even longer sea-crossing bridges, but the single-hole arch bridge, the longest, that is, more than 100 meters, the gap between them is huge.

However, the single-hole arch bridge, not so high technical difficulty, Zhaozhou Bridge, which was built in the Sui Dynasty, is more than 50 meters long, and the length of the single hole is more than 30 meters.

The use of new materials such as cement and steel bars, this technical level, should be much higher than Zhaozhou Bridge, this point, has been tested in the previous construction, as long as the aperture does not exceed 50 meters, can use this technology.

The 50-meter-long river surface does not seem to be a long distance, but in fact, in the land of China, there are really many rivers distributed, and there are a lot of surface runoffs on the plains.

But there are really not many rivers that are more than 50 meters long.

Below 50 meters, except for a few rivers, few others are navigable.

The narrowest part of the Bianhe River, the throat of the waterway from Tianfu to Bianliang, is also more than 150 meters, and such a river, under the pressure of huge capacity, is already somewhat insufficient.

The Bianhe River cannot be called a big river, but in the north of China, such a river is really rare, and in the range of 300 miles from Yingtianfu to Bianliang, there are almost the most such bridges.

Among the 300 miles of distance, more than 50 meters of rivers, there are less than 6, the widest, will not exceed 200 meters, which is also the favorable conditions of the Yingtianfu to Bianliang railway.

It does not pass through the famous big rivers, or some large tributaries of the Yellow River, basically, just some regional rivers, which, in this era, in general, are not very wide.

This is the closest river to Bianliang, in fact, it is a small tributary of the Bianliang Bianhe River, the volume of water is not large, but it spans in a critical area, through here, you do not have to go to the widest part of the Bianhe, which is also a key to the choice of railway.

For example, the famous Three Gorges of the Yangtze River, why it is called the Three Gorges, is because it is narrow, the original width of nearly a thousand meters, or even longer, is limited to a few hundred meters in the Three Gorges, and the narrowest place is even only forty or fifty meters.

The Yangtze River, which has a huge amount of water, has shrunk so much at once, coupled with the unique mountainous areas on both sides, has formed the magnificent scenery of the Three Gorges, of course, in the magnificence, but it contains countless dangers.

When the wide and calm river is suddenly concentrated, and the drop is large, the water flow will of course be very turbulent, before the comprehensive management of the Three Gorges, before the appearance of the dam, the Three Gorges is almost a ghost gate, and I don't know how many ships sink here every year.

Of course, the Bianhe River cannot be compared with the Yangtze River, this bridge called the Xiaowangzhuang Bridge is not as great as the Three Gorges Dam, but it is just a tributary of the Bianhe River, a relatively narrow place, less than 8 meters wide on the river surface, and the water flow is not fast, so it is not difficult to design a bridge.

The foundation is poured, and then, the cement prefabricated parts are respectively built on the base, and the foundation shelf that has been built has been held up by the entire bridge deck, and then the prefabricated parts are hoisted, and the link is compiled through cement and steel bars, so that the original, the bridge construction work with high technical content has become a very simple building block.

Because the bridge is smaller, and it is close to Bianliang, there are more personnel arrangements, and the progress has been accelerated a lot, and the bridge, which was originally scheduled to be completed in about 40 days, has actually made a lot faster.

Now, it has come to the construction of the prefabricated parts, and some strange things are erected next to them, and some technicians are in the midst of intense construction.

After the court meeting, Han Qi visited Zhao Xin and had already asked Zhao Xin about some things about the railway, compared with Ye Qingchen and other officials of the three divisions, Han Qi valued the transportation capacity of the railway more.

As the only commander in the Northern Song Dynasty who commanded the longbow on the spot and fought in the theme forbidden army, he can be said to have a deep understanding of the longbow.

The longbow is really good, it solves the relationship between reaction speed and range, and the overall projection ability is also strengthening, but a new problem has been born, that is, the pressure on logistics is huge.

Even if Zhao Xin made a tool for the production of arrow shafts, as long as he carried enough machines and obtained enough wood, he could process a large number of arrow shafts in a short period of time, which greatly reduced the pressure on logistics, as long as he carried arrows and tail fins, which reduced almost half of the weight of arrows, and small arrows and tail wings were also easy to pack, rather than 1.5 meters long arrow shafts, which needed special packaging.

However, compared with ordinary archers, there are four or five times more projection ability, and in the original forbidden army, the proportion of archers is at most, that is, one percent, and now it is as high as seventy percent, which is several times the cost of the previous one.

Ordinary soldiers, if they don't have food, can accept it for a short time, and even in some cases, it is possible to defeat under the cauldron and shipwreck, but archers, once they don't have a bow and arrow, they are really blind and can't fight at all.

A railway that can change the transportation situation of the entire Northern Song Dynasty will have a lot of military improvement, which is exactly what Han Qi values.

Even if Han Qi overestimated the horror of the railway as much as possible, he didn't expect that the railway would be terrible to such an extent, the transportation volume of 2,500 stones in one carriage was placed on the arrow, and if it was calculated according to 1 catty and 16 arrows, one carriage could transport 4 million arrows.

Even for a 40,000 forbidden army, 4 million arrows are enough to support this forbidden army for a period of high-intensity fighting.

Arrowheads, unlike arrow shafts, can be recycled as long as they are not hit by hard objects or damaged.

As long as it is not a losing battle, in the battle, most of the arrows shot by the longbow can be recovered, so that these arrows can support the battle for a longer time.

As long as the railway from Bianliang to Lingzhou is completed in the future, the support that Lingzhou will receive will be greater, with food and weapons, then it will not be as simple as holding Lingzhou, and expansion is possible.

In history, the Northern Song Dynasty gave people the feeling that it was very weak and often bullied.

It does not mean that the Northern Song Dynasty will not expand, if the Northern Song Dynasty will not expand, the Northern Song Dynasty can form such a huge land, because of the non-stop war, and the alliance with the Liao State was a series of frictions before, many of which were launched by the Northern Song Dynasty.

If the Northern Song Dynasty has the ability to take down the other party, it will not be polite to them at all, and when the time comes, Lingzhou will not even become the weakest link, and it is impossible to say that it will become the strongest link.

After that, every few days, Han Qi would come over, and the main discussion was about the railway, from the efficiency of the railway, to the construction of the railway, and the basic principles.

No, I heard that Zhao Xin was going to come to watch the construction of this bridge on the tributary of the Bianhe River, and Han Qi knew about it, so he insisted on coming along.

When Zhao Xin arrived, he didn't say hello, and the construction party didn't even know.

The railway from Yingtianfu to Bianliang can be said unceremoniously to be the most important project of the Dinghai Navy at present, and even on the railway from Haizhou to Suqian, once these are connected, in the future, the entire Northern Song Dynasty will build countless railways.

The empty talk and white teeth are not very tempting, but the real thing that is placed in front of everyone can really convince many people.

Came to the construction site, Zhao Xin's arrival, or caused a little commotion, the person in charge of the construction site, all came over in person, but under Zhao Xin's instructions, the construction was not stopped, and the whole project continued.

Han Qi is relatively novel about anything, the appearance of the bridge, there is nothing, in the Northern Song Dynasty, arch bridges, although there are not many, but it is not nothing, Zhaozhou Bridge is one of the obvious examples, this has gone through hundreds of years of wind and rain, standing still, and still playing a role.

Han Qi has been in Hebei for many years, and he is also very familiar with the Zhaozhou Bridge, and after knowing that this bridge is similar to the Zhaozhou Bridge, he also understands that he pays more attention to those tall and strange-looking things.

Han Qi's strange thing is that the crane is, basically, it is what the future generations will look like, and under the premise that electronic products and power products are not applicable, the crane has changed very little.

With the help of this body machine, some pulleys are made, which are sealed and form a fixed system, which is convenient to carry, and as long as it is fixed, the crane has a large dead weight under the premise, it can be operated by accumulating force.

Through countless pulley sets, the power can be saved to one-eighth, which can lift a lot of heavy objects, according to a group of livestock, about 5 tons of heavy objects can be pulled, the limit of this crane is 40 tons, for future generations, is just a very insignificant number, but in this era, it is very terrible.

One ton is about 20 stones, and 40 tons at a time is about 800 stones, which is almost the weight of the hull and cargo of a 400-material ship that is most commonly used on a river.

The specific gravity of cement prefabricated parts is about 2.5, that is, 40 tons, which can form 16 cubic meters of reinforced concrete pieces at one time.

16 cubic meters, equivalent to two two meters of cement, according to the width of the railway bridge of 16 meters, thickness of 2 meters, a cement prefabricated part, you can make the bridge in front of 0.5 meters.

Of course, 40 tons of things are unlikely to be delivered by land, and considering the practical problems, most of the prefabricated parts will be fixed at about 10 tons.

This weight has also exceeded the bearing capacity of the land, and it is best to have four-wheeled carriages, whose transportation capacity is only about 2 tons, which is still very demanding for the road surface.

Fortunately, the bridges are all on the water, even if it is such a small river, only 8 meters wide, the amount of water is not very large, but it is still possible to transport 20 tons of things, one ton is equivalent to 20 stones, 20 tons is only 400 stones, converted into materials, that is, less than 70 materials, such weight, for water transportation, is very simple.

For a bridge with a total length of no more than 15 meters, the cement prefabricated parts to be used are not much, about 100.

The people who came to participate in the construction were the most outstanding craftsmen in the entire Dinghai Navy, and they were very familiar with the use of cranes.

Knowing the role of the crane, even Han Qi was a little moved, the simple lifting device of the hoist crane, as early as the northwest, Han Qi had seen it, and even opened a large number of fortresses, which played a very big role.

However, this kind of thing, the limitations are also quite large, can only go straight up and down, in some specific places, can be used, many fortress construction, most of them rely on manpower.

This crane is different, Han Qi watched the crane lift the giant prefabricated parts on the ship, and then put them on the bridge deck like building blocks, the endless flow of ships, in a certain order, transported the prefabricated parts, the workers, skillfully hoisted these things, carried out in an orderly manner, and soon, a bridge began to take shape.