The income of the railway, that is a matter of the future, that is, Ye Qingchen is in control, although Han Qi is also in general affairs, but he is more in the military consideration.

Unlike canals, which have dry water and high water, the carrying capacity is high during the high water season, and the dry season will be reduced, and at the same time, there are many restrictions, so it is impossible for ships to run too fast.

This point, for the railway, does not exist, as long as the maintenance is timely, even if it is winter, it can operate, and the speed of the fast horse, and the speed of the fast boat, according to an hour of 100 miles to calculate, 12 hours a day, is 1200 miles, that is the real day thousands of miles.

From Bianliang to Lingzhou, if the whole process is opened to traffic, it can be reached in 2 days, even if it is an intermediate node, such as Guanzhong, which is not suitable for direct penetration, this time can also be reduced to about 10 days.

That's not the speed of the infantry, but the speed of the cavalry.

Under such a premise, even if Western Xia did not perish and there was another war in the northwest, they would be much easier.

As long as you prepare about half a month's worth of grain and grass, you can support a short war, and when the war is over, you can also quickly send the army back.

The army is always stationed in the place, which is the most economical, and the long-term habit of stationing is not only more comfortable, but also less expensive, which is equivalent to an objective reduction in investment.

Not to mention the savings in freight, according to the cost calculated by Zhao Xin, combined with the operation of the Dinghai Navy itself, the freight of 2,000 miles of grain in one stone, at most 150 Wen, sounds very high, even higher than the freight of the canal, but the timeliness is something that the canal cannot provide, and it is far lower than the transportation cost in the past.

A stone thing transported from Bianliang to Lingzhou, the minimum freight is more than 3 runs, which is also the fundamental reason why the grain in the frontier is expensive, the local lack of grain, almost all the grain needs to be imported from the outside world, and the high cost makes the garrison a huge problem.

This is also an inherent problem in the Western Xia and the Northern Song Dynasty, even if the military is very severe, in the entire northwest, the number of garrisons, that is, tens of thousands, can not be too much, too much, simple food is a huge pressure.

Now it's just 150 more, even in Bianliang, some seasonal grain fluctuations are enough to erase this gap.

From the military point of view, the railway has many advantages, even if it is through to Bianliang, even if it is through to Jingzhaofu, the benefits are huge, no matter how barren Guanzhong is, it can withstand the number of troops, and it is far more than the frontier.

The general introduction of the railway, which has been described through Zhao Xin's several introductions, is not very clear about the carriage traction and the railway itself, but he is very clear about the role of the bridge.

When the army marches, grain and grass are the most critical, but there is another one that must be carried out first, that is, the vanguard, the vanguard not only needs the vanguard to boost morale, but also must build bridges and open roads, without the vanguard to lay the foundation, the follow-up troops want to march, it will be very difficult.

Bridges in the Northern Song Dynasty, can not be regarded as rare, but the bridge that can pass the army, is really not much, the key is that pedestrians and vehicles are different, but even if there is a bridge that can be traveled by ordinary infantry, it is very important for the opening of an army.

A bridge, according to the concept of the Northern Song Dynasty, even if it is an ordinary bridge, is not built in a short time, those famous bridges, for example, the famous Zhaozhou Bridge, he from the opening of the emperor fifteen years, has been built to the second year of the great cause, which lasted up to 11 years, perhaps this is the solid root of the Zhaozhou Bridge.

Now there are no less than 50 large and small bridges from Tianfu to Bianliang, of which there are as many as four or five bridges that are no less than Zhaozhou Bridge in length, and these bridges will be completed in 40 to 60 days, which makes Han Qi more or less unbelievable.

Perhaps, cement can speed up the construction period of the bridge, which is the same as the city defense project, the original project that may take one or two years to complete, only one or two months can be done, but a bridge that lasts for five or six years, or even ten years, can not be lowered to one or two months.

But after watching the whole construction process, he understood that there was really such a magical method, and the huge cement prefabricated parts were built on the bridge deck one by one through the crane in a certain order.

They themselves have a unique design, even if they do not apply adhesives, they will have a certain stability, with adhesives, and some steel and cement pouring, as long as they are condensed, the whole bridge will be quite strong.

Mechanics is like this, not only cast-in-place has enough stability, some new materials in later generations of houses are more vividly showing unique characteristics, and even without adhesives, unique mechanisms stuck together, you can have strong strength.

Han Qi was very interested in watching from the side, in addition to the crane, he asked more about the cement prefabrication, after knowing the origin of the cement prefabrication, he seemed to think for a long time.

After a long time, Han Qi asked Zhao Xin a question, if the fortress uses a large number of cement prefabricated parts and uses cranes, it will definitely improve the efficiency of the construction of the fortress.

Zhao Xin listened to Han Qi's request, and was stunned for a moment, what Han Qi said, he was very familiar with this thing that could be used for the fortress and the house, isn't it a cement prefabricated slab, a perforated slab formed by combining steel bars and cement, which can be used for the construction of floor slabs.

In the seventies and eighties in China, it was very popular to build a house, before that, the construction method of the floor slab was cast-in-situ, but after this prefabricated slab, the construction layer by layer, as long as it is completed, there is no need to consider the problem of load-bearing, continue to build.

This method of construction, so that the construction of the house, save a lot of time, the construction speed is very fast, in a period of time, quite popular, almost most of the self-built houses, even a small number of unit buildings, also use this method.

The prefabricated slab has a fatal problem, that is, the seismic resistance is not good, once the vibration is generated, exceeding the bearing capacity, the cement slab will become a fatal kill.

The overall cast-in-place house, the overall performance is good, but the cement board, itself and other incompatible, they are shaken, will fall down first, at this time, not to mention the vibration brought by the truth, simply such a cement board falls, it is enough to kill, especially the layers of buildings, after the vibration, most of the cement board is shaken down, which is a nightmare for the people who live in it.

The reason why the prefabricated slab has such a big notoriety is that on the one hand, it is the place where it is produced, mostly some small workshops, and the quality is very inferior, as long as it looks almost good, the strength is not at all able to achieve the purpose of construction. ，

At the same time, it has a lot to do with the follow-up bonding, ordinary houses, self-built houses, they do not take into account the bonding of various materials, just use ordinary cement mortar, bonding, just a thin layer, and even without some fixed measures, there will be such a result.

On the contrary, the use of a large number of prefabricated parts in later large-scale projects, such as bridges, as long as the mechanics are reasonable, coupled with the effect of bonding and fixing, is enough to withstand earthquakes with sufficient vibration.

Zhao Xin's thinking is still in the 21st century, when the reputation of prefabricated panels has been rotten, especially in that disaster, many casualties caused by the collapse are caused by some prefabricated panels, this habit, Zhao Xin has not thought about this problem, and now, since Han Qi has put it forward, it has broken the inertia of his thinking.

Even the construction of bridges related to the throat of the railway, can use a large number of cement prefabricated parts, why simpler houses, but can not be used, as long as reasonable settings, coupled with follow-up project management, it seems that this hazard can be reduced to a minimum.

Perhaps his seismic coefficient is still not as good as cast-in-place, but it is not much different, but it is another excellent performance of cement prefabricated parts, that is, convenience and speed, but it has been vividly applied.

This point is also the key point proposed by Han Qi, that is, the speed of construction.

Why can the fortress play such a big role in the battle of the northwest, convenient and fast construction, is the key, really with the original city defense project, half a year, a year to complete the construction, then delay the big thing.

In feudal society, timeliness is never the most critical, and some county magistrates, even half a month, try cases once a month, that is, in the military, it is more important.

Sometimes, the difference between one or two days is the result of heaven and earth, in the war, let alone more than ten days, even if it is a promotion of one or two days, it is already very critical.

For example, when two armies face each other, this should be a field battle, but when one side is facing each other in the field, it has carried out some processing, and it takes a few days to complete one or several fixed fortresses at key points, which is an absolute nightmare for the other side.

Siege warfare has always been the most difficult, a fixed fortress, which has a very large supporting effect on one side, as long as it is used reasonably, it will play a decisive role in the war, as for the question of strength, in front of the purpose of the war, it will not exist.

Han Qi put it up like this, Zhao Xin's thought about it carefully, it was really like this, it could save half of the time, coupled with the efficiency of the crane, a fortress that might be built in thirty or forty days itself might only take 20 days, or even shorter.

More frustrating considerations, to a certain extent, the floor slab, do not need to be cast-in-situ, simple construction can be, there may be some hidden dangers, but as long as the peripheral bricks, condensed and reasonable, the basic fortress system is completed, the impact on the fortress will be reduced to a very low level,

In this way, they can quickly layout, and even when they occupy strategic places, they immediately build all kinds of fortresses, when they appear, even if they just occupy the territory, it is quite stable, even if it is just a model, there will be a considerable defense, which is stronger than the original fortified city, which will become the killer weapon of the Northern Song Dynasty.

After figuring it out, a lot of ideas will come to mind, Zhao Xin nodded, this thing is very simple, as long as the formula is researched, there is a simple site, there are some personnel and some technicians, this can be produced.

Whether it is technology or formula, this is not a big problem for Zhao Xin, and Zhao Xin did not think about it, taking this formula for money.

But the crane is different, it seems that it is so easy to operate, and the technical difficulty is very high.

This crane was made by Zhao Xin, at the beginning, it was just a tower crane, and there was a simple pulley set crane, which could save no more than twice the power, that is, it could lift a ton of weight, and now it can lift two or three tons.

Compared with the current crane, twenty or thirty times, I don't know how much worse.

For this quasi-modern crane, Zhao Xin does not know how many experiments have been carried out, for example, the crane boom, which is a key point, lifting a crane with a weight of 5 tons, and lifting a crane with 30 tons, or even 40 tons, their strength of the boom is absolutely different.

In later generations, even frenzied to get out of the 8,000-ton crane, this weight is really terrible.

Cranes of more than 30 tons, for the Northern Song Dynasty, are also frustrated, even if there is a card system, there are many excellent materials, but when it falls on the crane, it needs to be tried slowly.

The cranes used in bridge construction today, almost all of the materials on its body are handmade, the more powerful steel, those finely forged pulleys, and even the oil used in them are carefully formulated, these are not mass-produced models. ，

Manual, as well as the relationship between the card system, so that the production speed of these cranes is very slow, the card system, but also bear the embodiment of the Dinghai currency, intercepted from the middle, about 30 units have been produced, has been basically applied to the railway of Tianfu, in the future, as long as the railway is completed, continue to open the railway plan, the number of cranes needed, or will increase, conservative estimates, at least 100 cars, more than 300 cars, to barely enough.

Looking at Han Qi's expectant face, Zhao Xin considered transferring 10 units to help the Northern Song Dynasty military, there was no problem, but at this speed, within 3 months, don't think about it, and after that, 1 unit every two months, until all of them are finally in place.

Han Qi also said casually, such a piece of equipment should be the killer weapon of the Dinghai Navy, it is not so easy to get it, who knows, Zhao Xin actually spit out and said to 10 units, one has such a great effect, 10 units, the speed of the frontier popularization fortress, it will definitely go to a higher level, as for the words, it will take more than two years to be fully equipped, he doesn't care at all, as long as the things are in hand, it will take time for the northern system to be completed, and when the time comes, a complete northern system will be completed. The Great Song Dynasty must be impregnable.