There are a total of fifteen Dao in Datang, each of which has a large area, and of course, it also contains a lot of resources, lime and clay, which are available in each Dao, and of course there will be no shortage of sand and gravel blocks. Pen % fun % Pavilion www.biquge.info

In order to popularize cement workshops in the Tang Empire, Li An specially trained 300 talents while building cement workshops near the capital, and planned to let them learn the process of making cement, and then go to various provinces to build cement workshops, and then, step by step, build a certain number of cement workshops in the prefectures and counties suitable for building cement workshops in the jurisdiction, so as to promote road construction and improve the housing conditions of the people.

Because the manufacture of cement is really very simple, 300 talents were quickly trained and sent to each province according to the scale of 20 people per province.

After dealing with the cement promotion, Ang Lee began to consider plans to build a large number of bridges, of course, all of which are currently being built to serve the future construction of the railway to Laizhou, without which the railway to Laizhou would not be laid.

Since the purpose of these bridges was to build railway services, the location of these bridges must be on the railway line, that is, the railway line to Lai Chau must be determined before the construction of the bridge can begin.

Of course, when the two strategic railways began to be laid, Li An had already sent two exploration men and horses to start inspecting the railway lines, one of which was the strategic railway in Anxi, and the other was the strategic railway to Laizhou.

Anxi is almost all desert, and there is no need to care about building bridges at all, and the railway line to Laizhou is different, this line has to cross many water systems, and there are also large rivers such as Jishui with a width of nearly two miles, which are almost vertical and horizontal, so Li An put more energy on the eastern railway line, and immediately invented cement and concrete, and of course, more high-end reinforced concrete, in order to build large bridges over these water systems along the way, so that the rails can pass smoothly all the way.

The officials of the railway bureau, who were exploring the railway line, had already returned to the capital and handed over the best route for exploration to Li An, so that Li An could make the final decision.

Li An didn't have much time to personally inspect the route, and since these people from the railway bureau had already determined the road, he would not raise an objection and immediately agreed.

After the railway line from Luoyang to Laizhou was determined, the first step was to build the bridge, only the bridge was built first, and all kinds of materials for laying the railway could be smoothly transported to the railway line, so as to speed up the process of laying the rails.

During the construction of the Longshou Canal Bridge outside the Chunming Gate, these craftsmen who participated in the construction had already mastered a certain amount of experience in building concrete bridges, but the Longshou Canal was a very narrow river and could not be compared with Luoshui and the Grand Canal at all, so if you want to build the Luoshui Bridge and the Grand Canal Bridge, you must still conduct some research.

Luoshui is not far from Luoyang, and the section of the Grand Canal to be passed through is also near Luoyang City, so for this reason, Li An first has to build these two bridges.

In order to build these two railway bridges, Li An first sent a team of men and horses to build a cement factory near Luoyang City, and summoned manpower to carry out large-scale production, in addition, the use of cutter suction dredgers, sand panning in the river near Luoyang City, in order to supply the needs of building bridges, and also to transport a large amount of black powder to Luoyang Nearby, the bluestone in the nearby mountains to be blown up, so that there are broken stones, as for the manufacture of steel bars, the workshops near Chang'an City have been preparing for a long time, and the use of train freight can be transported to Luoyang City in large quantities.

After these materials were arranged, Li Ang led more than 1,000 talents in bridge building to Luoyang City by passenger train, prepared on-site guidance, and gave ideas and methods for building the bridge for the craftsmen to complete.

According to the current capacity of the train, more than 1,000 people only need one train is enough, and the various machinery needed to build the bridge uses a freight train, which is arranged by Yu Chaoen, and Li An does not need to bother, he only needs to take the car to go.

In the comfortable sleeper car, Ang Lee picked up a pen and paper and drew a figure of a bridge on a piece of white hard paper, that is, the railway bridge of later generations, divided into two layers, the lower layer is the railway, and the upper layer is the highway for the carriage and horses.

The construction of such railway bridges is quite complex, and the difficulty of construction and the materials consumed must be very huge, but the construction of such bridges is of extremely important strategic significance, so no matter how high the cost, these bridges must be built.

Although the width of Luoshui and the Grand Canal is only a few hundred steps, not even a mile, in order to ensure the smooth flow of water transportation, the bridge deck of the railway bridge must be built higher, and in order to make it easy for carriages and horses to get on the bridge, it is necessary to build a very long approach bridge, so that the total length of the bridge to be built will be much wider than the river surface.

Of course, how long the approach bridge needs to be, but also depends on the height difference between the banks on both sides and the water surface of the river, and then a decision can be made, if the water surface of the river is much shorter by the banks on both sides, the approach bridge does not need to be too long, if the two banks are almost the same height as the river surface, then a very long approach bridge is needed.

Only after arriving at the scene can Li An finally determine how long the total length of the bridge needs to be.

After all the drawings were drawn, Li Ang let several technical backbones enter the carriage and told them the structure and characteristics of the railway bridge, so that they could understand how the railway bridge should be laid and the technical difficulties that may be encountered.

These craftsmen are experts in bridge-building, although they used to build stone bridges and wooden bridges, but the principle of bridge-building is still very clear, so, after the construction of the Longshouqu Bridge, they quickly understood the various characteristics of concrete bridges, and knew that this advanced bridge-building material is much stronger than stone and wood.

For Ang Lee's proposal to build bridges on the Luoshui and Grand Canal, these craftsmen were all very shocked at the beginning, thinking that Ang Lee was a little crazy, but after carefully analyzing the characteristics of the concrete bridge, they were convinced that Ang Lee's idea could be completely realized, and fully supported Ang Lee, after all, as long as these advanced bridges were built, they craftsmen would also be proud, any profession has a sense of professional pride, and bridge-building craftsmen are of course no exception.

Before dark, the train arrived at Luoyang City Railway Station on time, and Li An took more than 1,000 craftsmen to take shelter in Luoyang City for the time being, preparing to go to Luokou early the next morning to immediately go to Luokou to investigate how to build the bridge.

After dinner, Ang Lee continued to draw drawings to perfect the details of the railway bridge, find the best design ideas, and build the most high-end railway bridge at the lowest cost.

Early in the morning of the second day, Li An led a thousand craftsmen, as well as a large number of bridge-building machinery, to the direction of Luokou, the craftsmen and machinery were too slow, Li An threw them off, and only led a small number of technical backbones to ride horses first, of course, there were dozens of guards with knives and a few talents from the Railway Bureau.

"Li Shilang, this is the place, the river here is the narrowest, and it is the most suitable for building a bridge."

A talent from the Railway Bureau, pointing to Luoshui in front of him, said loudly.

Li An looked up and glanced at it, this location is indeed very good, not only is the distance only more than a hundred steps, but also the banks on both sides are much higher than the river, so don't raise the bridge too much, and the approach bridge doesn't need to be too long.

After some observation, Li Ang finally decided on the plan of the bridge, and in this plan, the total length of the bridge is two miles of road, the lower railway is flush with the road on both sides, and the upper road is slightly higher, so it is necessary to build an approach bridge for the upper road.

The approach bridge should be bent to one side, not in a straight line with the main bridge, otherwise, it will block the rails and trains, after all, it is a railway bridge, the main function is to let the train go, and the carriage can easily turn, but the train can only go in a straight line, so, of course, to sacrifice the straightness of the road.

After the plan is determined, the construction will begin, and at this time, a lot of materials have been prepared for the construction of the bridge, although it is not enough to support the needs of the entire bridge, but the various materials required for the early construction are still sufficient.

The pier of the approach bridge is relatively easy to build, only need to dig the foundation, and pour reinforced concrete, and the pier of the main bridge is not very easy to build, which needs to lay the foundation in the water, and, the height of the whole pier is relatively large, and the materials that need to be consumed are more, but these are difficult to smart construction talents, they have long had experience in this area, and it is easy to get the construction of the bridge pier in the water.

In order to increase the strength, all the piers were buried with steel materials, and it took a long time to build the piers, and Ang Lee used this time to go to the banks of the Grand Canal not far away to investigate the construction of a second canal railway bridge.

The situation of the Grand Canal is completely different from that of Luoshui, where the bank is almost the same height as the water surface, and in order to ensure the smooth passage of the boats, the height of the bridge deck must be raised upwards, so that the length of the approach bridge needs to be greatly increased.

Li An made a preliminary estimate that to build a canal railway bridge, it would take five miles to add the approach bridge and the main bridge at this level of the railway, and it would take seven or eight miles to add the approach bridge to the road on the upper level.

That is to say, the construction difficulty and amount of the canal railway bridge are much greater than that of the Luoshui railway bridge, and only after the successful construction of the Luohe railway bridge can the manpower be taken out to build the canal railway bridge.

Of course, the purpose of building the Luohe Railway Bridge first, rather than recruiting manpower, is to verify the technology of building the bridge, to see how effective the railway bridge is to be built by adopting this construction method, and to build a second bridge on the basis of summing up enough experience, and then continue to sum up the experience.

Ang Lee believes that as long as the Luoshui Railway Bridge and the Grand Canal Railway Bridge are all built and put into use, the following bridges will not have to worry about themselves, and these bridge builders who have mastered the technology will be fully qualified to build these bridges.

The construction of the piers of the Luoshui Railway Bridge is proceeding in an orderly manner, and the modular reinforced concrete bridge deck structure is also under construction.

After inspecting for a few days, Li Ang confirmed that there would be no major problems, so he took the train back to Chang'an City, and handed over the task of building the bridge to these skilled craftsmen, believing that they would be able to complete the task of building the bridge as expected, and Li An would return to the Luokou Bridge again in a few months to check the quality of the bridge.

In the evening, the train arrived at the Chang'an City Railway Station on time, and Li An stepped out of the carriage surrounded by guards.

"Li Shilang, what a coincidence!"

As soon as Li An walked to the train, he saw Guo Xuji, the waiter of the Ministry of Works, walking over with a smile.

"Guo Shilang, why are you here, it seems that the night train has not opened!"

Li An looked at Guo Xuji very curiously.

He felt that Guo Xuji was deliberately waiting here, in order to see him as soon as possible, but Li An's return to Chang'an City was a temporary intention, and he didn't tell anyone in advance.

Could it be that Guo Xuji really happened to pass by here? Or maybe there is some unpredictable prophetic ability, who will pinch his fingers.

"Li Shilang, the official happened to be passing by, and when he saw Li Shilang getting out of the car, he greeted him, how about it, the Luokou Bridge was built smoothly!"

Guo Xuji casually prevaricated and asked about the bridge.

"Haha! The construction of the Luokou Bridge is going well, and the craftsmen are working day and night, and it is estimated that it will be completed in a few months. ”

Ang Lee confidently introduced that he had absolute confidence in the railway bridge he designed, and believed that the craftsmen responsible for building the bridge would be able to complete the task well.

"It's good that everything goes well on the bridge, it's good that everything goes well, this is really a blessing for the Tang Dynasty!"

Guo Xuji said happily, smiling a little from ear to ear.

"Guo Shilang, do you need to be happy to be like this?"

Li An frowned and looked sideways at Guo Xuji.

"Hehe, Li Shilang, there is something I want to discuss with you."

Guo said in a sneering manner.

"What's the matter, Guo Shilang said it's okay."

Guo Xuji pondered for a moment and said: "Li Shilang, building a bridge is a big project, and a bigger bridge will be built in the future, so the imperial court should set up a special yamen to build bridges, just like the Railway Bureau." ”

"The yamen who built the bridge?"

Li An was stunned suddenly, and immediately understood that Guo Xuji was not passing by at all, but deliberately waiting here, and the purpose of his waiting here was to build a bridge for the yamen.

"Guo Shilang's meaning, the official understands it very well, and it is also very necessary for the imperial court to form a yamen to build a bridge, but whether this yamen for building a bridge will be subordinate to the Ministry of Industry, this official cannot guarantee it, everything depends on His Majesty's will."

Ang Lee said with a smile.