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Daibei has not yet been taken, but it seems that the construction of a longitudinal cement road should already be put on the agenda. The land of Daibei is the connection point of Hebei, Hedong and Saiwai grassland, whether it is from Hebei out of Yan into Jin out of Saiwai or Hedong out of Jin into Yan to Saiwai, or from Saiwai to the south of Yanjin, this is the only way. If the Qin army built a road to connect the three places, it would be very important to strengthen the control here. Even according to the strategic plan of the Qin army, after taking Hebei in the future, the Qin clan will inevitably wave his troops to cross Taihang and take the land of Shanxi. Even after taking Shanxi, we have to use Shanxi as a springboard to tackle the key points. As a result, this transport line is becoming more and more important.

In this era, transportation mainly relies on inland waterway shipping and sea transportation, and inland waterway shipping carries two or three hundred stones, or even ten thousand stones. One stone in the Tang Dynasty is one hundred and twenty catties, one tael in the Tang Dynasty is about 42 grams, one catty is about 680 grams, and one stone in the weight unit is almost 80 kilograms. Therefore, an ordinary river transport vessel wears 200 stones, and there are also 16 tons. As for the ship of Wanshi, it is as high as 800 tons, in later generations, the carrying capacity of 800 tons is nothing, but at this time, it is already a behemoth, such a ship can only sail in the Yangtze River, canal, Huai River, Yellow River, etc., and the general river can sail, mostly two or three hundred stone ships.

Chang'an, the capital of the Tang Dynasty, has always relied on the supply of money and grain from the southeast, which needs to be transported to Guanzhong by canal and waterway.

The lifeline of the Tang Dynasty is the canal, and the goods in the southeast must be transported to Guanzhong through the canal, which is Bashu and other places in the southwest, and even through the Yangtze River. Send Shannan and Bashu in the middle and upper reaches of the Yangtze River to the lower reaches of the Yangtze River. Then it turns back to the northwest and goes north through the canal to the Yellow River. It was then transported all the way west into Beijing.

Once there is a police in the canal, it will directly choke Guanzhong's throat.

This is also the reason why Dezong's father and son cried with joy when they heard that the canal was reopened, and the reason why Tian Lingzi hurriedly fled Chang'an with Li Yi, and it was also the reason why Huang Chao was in a quagmire in Chang'an, and he had to ask them for money and food at the risk of being forced to surrender to the towns.

The political center of the Tang Dynasty is in Guanzhong, in the Central Plains, but their lifeline artery is the canal.

Li Jing's Qin Fan has been able to develop so rapidly in recent years, in fact, a big reason is that Li Jing does not rely on this artery. Li Jing was originally based in Dengzhou. Operate Liaodong as the base camp, and then capture Hebei, relying on the sea transportation of the Bohai Sea.

The huge Bohai Sea, coupled with a strong naval division, as well as a well-developed shipbuilding and shipping industry, enabled Li Jing to transport and transfer through the Bohai Sea with countless ships carrying thousands of stones.

After conquering Liaodong, Li Jing also began to build a coastal road, which was centered on Liaoshui longitudinally, from Yingkou by the sea to the West Liao River in the north. And rampant. It is from Shanhaiguan to the sea all the way to Pyongyang on the south bank of the Yalu River.

This road cost the Qin army a lot of financial resources and manpower. But after the repair, it played a huge role in controlling Liaodong. However, the road is made of loess and sand, and it is muddy and inconvenient during the rainy season, and even on weekdays, the road is often overwhelmed and must be maintained frequently. More often, the Qin army's long-distance transportation still had to rely on sea transportation.

However, now the center of gravity of the Qin army has gradually shifted to Hebei, not only that, but with the continuous expansion of the Qin army, the power of the Qin army has also continued to expand to the Central Plains.

In Hebei, Shanxi, Rehe, and Shandong provinces, the Qin army continued to expand westward, relying only on sea transportation, which was increasingly unable to satisfy. There is a more troublesome problem in shipping is that every year in winter, the port mouth in the north is basically frozen, and the freezing period is as long as two or three months. Although the Qin army had several ice-free ports, they were far from being able to meet the volume of transportation during this period. This shortcoming, in particular, in times of war, is sometimes often fatal.

Now Li Jing is preparing to draw up a new plan, a longitudinal line plan.

Li Jing's longitudinal line plan was intended to establish a three-level system of sea, water, and land transportation to comprehensively enhance the transportation capacity of the Qin army. This longitudinal line was not only to solve the problem of transporting materials, but more importantly, to allow the Qin army to be deployed more quickly to any front-line battlefield in the territory.

His idea is that in the future, the Qin Dynasty will still attach importance to shipping, from Pyongyang to Dalian to Tianjin to Dengzhou to Qingdao to the mouth of the Huai River, to Chuzhou, along the coast, will build and expand more ports and build more sea ships. At the same time, the Qin army will also connect the 16 major rivers in the territory of Yalushui, Liaohe, Bailangshui, Luanhe, Sanggan River, Zhangshui, Juma River, Hutuo River, Yongji Canal, Yellow River, Jishui, Huaihe, Bianhe, Surabaya, Yishui, and Shushui to form a huge inland water transport network.

In addition, the most important thing is the longitudinal route by land, and Li Jingji planned to build a cement road on the basis of this road from Pyongyang to Shanhaiguan. This new highway will start from Shangjing Prefecture in Bohai Kingdom, pass through Zhongjing Prefecture, Tokyo Prefecture, Tokyo Prefecture and other coastal areas along the way, connect to Pyongyang, Nakyocheng, all the way to Dalian, Lushun and Beisha on the Liaodong Peninsula, and then go west to Yingkou, Liaoyang, Panjin, Jinzhou, Qinwangdao, Shanhaiguan, Tangshan, Yanjing, Tianjin, Cangzhou, Mozhou, Tianjin, Dizhou, Dezhou, Qizhou, Qingzhou, Dengzhou, Yanzhou, Yizhou, Haizhou, Sizhou, Chuzhou and other places.

This road will be based on the foundation of the original sections of the road, paved with thick cement to increase the bearing capacity of the road, and at the same time excavate drainage ditches on both sides to reduce the damage of rainwater to the road surface and roadbed. This will be a two-way, four-lane concrete road that will be used to solve the problem of ice in the northern sea in winter, and the inland rivers are also frozen in winter, and the transportation is not effective.

On this 5,000-mile-long overland route, a number of horizontal cement roads will be built to connect the various nearby cities along the main road.

In this way, even during the winter frost period, with such a wide two-way four-lane cement road, the land transportation of the Qin army could be transported by four-wheeled horse-drawn carriages, and even six-wheeled and eight-wheeled heavy carriages.

And in the planning of this land longitudinal line, there is also a horizontal trunk line. Li Jingji planned to build a road across the northeast from Zhongjing Prefecture in the Bohai State as the starting point in the east, and all the way to the west horizontally, and this road started from Tokyo in the Bohai Sea. And it has been repaired until the Yumen Pass in Shazhou, Hexi in the west. Of course. It's just a long-term plan. In the current plan, it is to start from the domestic city on the bank of the Yalu River to the west, pass through Phoenix City, Liaoyang City, Yingzhou, until Chengde, Xijing Yatent, and then pass through Junduguan, Fuzhou to Datong Yunzhou, and in the future, it will also go west through Zhenwu Army, out of the east of the river, and enter the Longyou River along the Yellow River. Fengzhou, Lingzhou, Liangzhou, Ganzhou, Suzhou, Shazhou and other places west of the river.

These two trunk lines. It will be centered on Yanjing, connecting the north and south vertically, and connecting the east and west horizontally.

Once these two roads are built, the longitudinal line will solve the problem of grain and grass transportation, as well as the transportation of goods. The horizontal line is more important to help improve the Qin army's control over the Yanshan and Yinshan lines in the north. With the road, the Qin army was able to push the control area from the line of Yanshan and Yinshan to the north, all the way to the grassland, so that the Qin's Yanjing strategic defense circle could be extended further north. The strategic defense layer has been expanded to make it more secure and stable.

Of course. If these two roads are built, they will also provide a more convenient passage for the Qin army to march south and expand westward in the future. At that time, the Qin army went south along the avenue and went straight to Huainan. The cavalry went west along the avenue, and the speed could be more than doubled to reach Daibei. And the transportation of logistics can also keep up with the army by the way, and it will never let the logistics drag down the offensive rhythm of the army.

In this way, with the Bohai Rim strategic core circle, plus the north-south waterway transportation line, and this north-south-east-west longitudinal land trunk line, once there is a police, the Qin army can even rely on powerful mobility and transportation network to give full play to the advantages of internal operations to a certain extent.

On the maritime side, only a few additional terminals need to be built and a few existing terminals need to be expanded.

In terms of water transportation, the main thing is the North-South Grand Canal, and what needs to be done is only to dredge the dozen or so big rivers from the northeast to Huainan, and connect them between suitable rivers.

The real big project is still the north and south avenues, and the longitudinal trunk line is 5,000 miles long. The main line is to connect the existing roads and then upgrade them, so the most labor-intensive excavation and foundation consolidation work can be saved, but even if there is no need for new roads, the cement required is definitely not a small number, and even the two drainage ditches are not a small project. And not only does it require a lot of cement, but it also requires a lot of road builders.

In this regard, Li Jing has been thinking about it for a long time, and plans to arrange more and more displaced people to build roads, let them work, and give food wages. After a section of the road is completed, the displaced people in this section will be directly settled in the vicinity of the road and given land. In addition, the sturdy young men were drawn out of them to work for the peasants, and in their spare time they were trained to become road guards, who took turns to be responsible for the maintenance of the local roads, and set up checkpoints, and collected tolls to cover the road maintenance fees, and the training funds and subsidies of these militias. Since then, these displaced people have been attached to the main roads, ploughing, building roads, receiving training, and collecting tolls. In the event of a war, they will also be drafted as soldiers to assist in local warfare.

Especially in the area outside the Guanguan, the land is vast and sparsely populated, and this kind of militia armament can sometimes greatly fill the shortage of regular soldiers of the Qin army. It is very necessary to add some road protection militia in addition to the garrisons of the soldiers, the united barracks of the counties, and the township troops.

However, the question that made Li Jing hesitate the most was, even if the cement pavement was built, how many materials could the animal-powered cart carry?

By sea, shipping can reach 10,000 stone per ship, more than thousands of stones. Inland water transportation is also dominated by two or three hundred stones per ship. How much can be transported by land?

Li Jing looked through some data, a bull pulling a cart can carry eight stones, and a cow can carry five stones. Twin oxen pull carts, at least ten stones. However, this refers to two-wheeled vehicles, and if it is a concrete road, you can drive a four-wheeled carriage, which should carry more load.

Historically, the use of horse-drawn carriages in the Napoleonic wars reached its peak, and in the war of Napoleon's invasion of Russia alone, the French army mobilized 38,700 heavy and light four-wheeled carriages, each of which could carry 1.5 tons of supplies, and it is said that Napoleon's army used to tow 187621 horses.

By this figure, a heavy carriage was more than two and a half times the weight of an ordinary ox-cart. And if it is a concrete road, then the four-wheeled carriage can be bigger, the road is easier to walk, and the truck will be larger. If a heavy four-wheeled carriage weighs two tons, which is equivalent to 25 stones, twelve heavy carriages can be equivalent to a 300 stone ship in an inland river. It takes 400 heavy carriages to be equivalent to the carrying capacity of an ordinary Wanshi ship.

When looking at the numbers, the volume of land transportation is far inferior to that of sea transportation, and it is not as good as that of inland waterway shipping.

But in the end, Li Jing still felt that the land route was necessary. Because these two trunk lines are not intended to replace sea and land transport, but are used as an auxiliary to sea and water transport. Sea freight has the largest carrying capacity, but it is also extremely restrictive, not only in the winter when the northern ports are frozen, but also during the summer storms, it is impossible to leave the port. At the same time, sea transportation can only be carried along the coast. Inland waterways are also very restricted, they can only be transported by inland waterways, and rivers often limit the number of ships that can be transported, and they are also unable to transport during the winter freeze or dry season.

The amount of land transportation is small, but it has the advantage that it is not limited by the weather, it is not limited by the season, and as long as there is a road, it can be reached anywhere.

What's more critical is that after the road is repaired, not only can they transport materials, but their greater role is also a huge role in the military, quickly transporting troops!

Li Jing nodded, and the pencil in his hand drew the last full stop, and finally completed the long "longitudinal plan for sea, land and river transportation". (To be continued......)