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Daibei has not been taken yet, but the construction of a vertical line cement road seems to have already mentioned the procedural process. Daibei is the connection point between Hebei and Hedong and the grassland outside the frontier. Whether it is from Hebei to Yan and Jin, Hedong to Yan and Yan to the frontier, or going south to Yan and Jin outside the frontier, this is a must-pass road. If the Qin army builds a road to connect three places, it is very important to strengthen the control here. Even according to the strategic plan of the Qin army, after taking Hebei in the future, Qin vassal will inevitably lead troops to cross Taihang and take the land of Shanxi. Even after taking Shanxi, Shanxi must be used as a springboard to directly attack Guanzhong. Therefore, this transportation line becomes more and more important.

In this era, transportation mainly relies on inland shipping and sea transportation. Inland shipping carries two or three hundred stones, and even ten thousand stones are everywhere. One stone is 120 kilograms in Tang Dynasty, one or two taels are about 42 grams, one kilogram is about 680 grams per kilogram, and one unit of weight is about 80 kilograms. Therefore, ordinary river transport ships wear two hundred stones, and there are 16 tons. As for the ships with ten thousand stones, the carrying capacity is as high as 800 tons. In later generations, the carrying capacity of 800 tons was nothing, but at this time, it was already a huge thing. Such ships can only sail in the lower reaches of the Yangtze River, canals, Huaihe River, Yellow River, etc., while ordinary rivers can sail mostly two or three hundred stones.

Chang'an, the capital of the Tang Dynasty, has always relied on the southeast to provide money and grain. These grain and taxes need to be transported to Guanzhong via canal waterways.

The lifeline of the Tang Dynasty was the canal. The goods in the southeast must be transported to Guanzhong through the canal, that is, Bashu and other places in the southwest. Most of them even pass through the Yangtze River to send Shannan and Bashu in the middle and upper reaches of the Yangtze River to the lower reaches of the Yangtze River, and then turn northwest to the Yellow River through the canal. Then, they are transported to Beijing all the way west.

Once there was a police officer in the canal, it directly strangled Guanzhong's throat.

This is also the reason why Dezong and his son cried and hugged each other when they heard the canal was opened again. It is also the reason why Tian Lingzi hurriedly fled Chang'an with Li Yan, and it is also the reason why Huang Chao was in Chang'an and had to force him to surrender to the towns and ask for money and food from them.

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

The fact that Li Jing's Qin vassal has developed so rapidly in recent years is that Li Jing did not rely on this artery. Li Jing initially took Dengzhou as the foundation and operated Liaodong as the base camp, and then attacked Hebei, relying on sea transportation from the Bohai Sea.

The huge Bohai Sea, coupled with the powerful navy and the developed shipbuilding and shipping industries, Li Jing used countless ships with loads of thousands of stones to transport and transport through the Bohai Sea.

After conquering Liaodong, Li Jing also began to build a coastal channel, with the Liao River as the center in the longitudinal direction. From Yingkou by the sea to the Xiliao River in the north, and the straits were built from Shanhaiguan by the sea to Pyongyang on the south bank of the Yalu River.

This road took a lot of financial and manpower from the Qin army, but after it was built, it played a huge role in controlling Liaodong. However, this road was made of loess and sand and stone, and it was muddy and extremely inconvenient when the rainy season came. Even on weekdays, the road was often overwhelmed and must be maintained regularly. More often, the Qin army's long-distance transportation still had to rely on sea transportation.

However, now the focus of the Qin army has gradually shifted to Hebei. Not only that, with the continuous expansion of the Qin army, the power of the Qin army has continued to expand to the Central Plains.

The Qin army continued to expand westward in Hebei, Shanxi, Rehe, and Shandong provinces. It was increasingly impossible to meet the needs of shipping alone. Another more troublesome problem is that in winter every year, the buzzer mouths in the north basically freeze, and the freezing period lasts for two or three months. Although the Qin army had several unfreezing ports, it was far from meeting the transportation volume during this period. Especially this disadvantage, sometimes it was often fatal during war periods.

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

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

His ideas were that in the future, the Qin vassal state would still pay attention to sea transportation. From Pyongyang to Dalian to Tianjin to Dengzhou to Qingdao to the mouth of Huaihe River, to Chuzhou, and along the coast, more ports would be added and expanded to create more sea ships. At the same time, the Qin army would also connect the Yalu River, Liaohe, Bailangshui, Luanhe, Sangganhe, Zhangshui, Jumahe, Tengtuo River, Yongji Canal, Yellowhe, Jishui, Huaihe, Bianhe, Sishui, Yishui, and Shushui to form a huge inland water transportation network.

In addition, the most important thing is the land vertical line. Li Jing plans to build a cement avenue based on the Hanghai Avenue from Pyongyang to Shanhaiguan. This new avenue will start from Shangjing Prefecture in the Bohai Kingdom, pass through the coastal areas such as Zhongjing Prefecture, Tokyo Prefecture, and Tokyo Prefecture along the way, connect to Pyongyang and domestic cities, and all the way to Dalian, Lushun, and Beisha on the Liaodong Peninsula. Then go west to Yingkou, Liaoyang, Panjin, Jinzhou, Qinwang Island, 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 original road foundations, with thick cement laid to increase the bearing capacity of the road, and at the same time, drainage ditches are dug on both sides to reduce the damage to the road surface and the roadbed by rainwater. This will be a two-way four-lane cement road, which will be used to solve the solution of icy on the northern seas in winter, while inland rivers are also icy and poor transportation.

On this super long land trunk line that lasts 5,000 miles, some horizontal cement roads will be built to connect various nearby local cities passing through this main road.

In this way, even if it is the winter freezing period, there is such a wide two-way four-lane cement road, and the Qin army's land transportation can be transported by four-wheeled carriages, or even six-wheeled or eight-wheeled heavy carriages.

In the plan for this land vertical trunk line, there is also a horizontal trunk line. Li Jing plans to build a highway across the northeast from Zhongjing Prefecture of Bohai Kingdom as the starting point to the east, and to build a highway across the northeast region from Tokyo in the Bohai Sea as the starting point to Yumen Pass, Shazhou, Hexi to the west. Of course, this is just a long-term plan. In the current plan, it is to build from the domestic city on the banks of the Yalu River as the starting point to the west, passing through Fenghuang City, Liaoyang City, Yingzhou, until Chengde, Xijing Yazhang, then passing through Jundu Pass, Guizhou to Datong Yunzhou. In the future, it will also go west through Zhenwu Army, leave Hedong, and enter Longyou Hequ along the Yellow River. Fengzhou, Lingzhou, Liangzhou, Ganzhou, Suzhou, Shazhou and other places in Hexi.

Both of these trunk lines will be centered on Yanjing, with vertical lines connecting north and south, and horizontal lines connecting east and west.

The two roads were built. The vertical line will solve the problem of food and grass transportation and the problem of cargo transportation. 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 can continue to advance from Yanshan and Yinshan lines to the north and push it to the grassland. The Qin vassal's Yanjing strategic defense circle will be expanded further north, and the strategic defense layer will be expanded to be safer and more stable.

Of course, if these two roads are built, it will also provide a more convenient passage for the Qin army's march southward and expansion westward in the future. At that time, the Qin army headed south along the avenue and went straight to Huainan. The cavalry went west along the avenue, which could increase the speed of more than twice the current speed and reach Daibei directly. The logistics transportation could also keep up with the army, and the logistics would never delay the attack rhythm of the army.

In this way, with the strategic core circle of the Bohai Rim, the north-south water transportation line, and the north-south east-west land trunk line, once there is a policeman, the Qin army can even rely on powerful motor power and transportation networks to give full play to the advantages of inside combat to a certain extent.

In terms of shipping, only a few docks need to be built and several existing docks need to be expanded.

In terms of water transportation, the main focus is on the North and South Grand Canal. All we need to do is to clear the dozen major rivers from the Northeast to Huainan and connect them between suitable rivers.

The real big project is still the two avenues of north and south, and the longitudinal trunk line is as long as 5,000 miles long. This trunk line mainly connects existing roads and then upgrades. Therefore, the most labor-intensive excavation and solidifying foundation work can be saved. However, even if the newly excavated roads are not needed, the cement required is definitely not a small number, and even the two drainage ditches are not considered small projects. Moreover, it not only requires a large amount of cement, but also requires a large number of road construction workers.

In this regard, Li Jing thought for a long time and planned to arrange more and more refugees to build roads, let them work, and give them food wages. Build roads according to sections. After a section of the road is completed, the refugees who repair the roads will be placed directly near the roads and settled down and distributed to land. In addition, the strong young and strong people are also taken out of it, busy for farmers and receive training in their spare time to become road guards militias. These people take turns to maintain the local roads, and set up checkpoints and collect tolls to recharge road maintenance fees and training funds and subsidies for these militias. From then on, these refugees are attached to the main roads, farming, building roads, training, and collecting tolls. In case of war, they will be recruited to help local wars.

Especially in areas outside the pass, where the land is vast and sparsely populated, this kind of militia can sometimes greatly fill the shortcomings of the Qin army's regular soldiers. For areas outside the pass, even if they immigrate, it is impossible to change the situation outside the pass. It is necessary to add some road protection militias in addition to the combat troops, united barracks of counties, and township troops.

However, the question that Li Jing hesitated the most was that even if the cement road was built, how much material could the animal truck carry?

By sea, shipping can reach 10,000 shi per ship, most of which are thousands of shi. Inland water transportation is mainly two or three hundred shi per ship. How much can land transportation be transported?

Li Jing looked through some data. A bull can carry eight stones, and a cow can carry five stones. A double cow can pull a cart, at least ten stones. However, this refers to a two-wheeled cart. If it is a cement road, it can drive a four-wheeled cart, and the four-wheeled cart should carry more weight.

Historically, four-wheeled carriages were used to the Napoleonic Wars. In the war of Napoleon's invasion of Russia alone, the French army mobilized 38,700 heavy and light four-wheeled carriages, each heavy carriage could carry 1.5 tons of supplies. It is said that the number of horses used by Napoleon's army to tow the carriages reached 187,621.

According to this number, heavy carriages are more than two and a half times the weight of ordinary ox carriages. If they are cement roads, then four-wheeled carriages can be larger, and the roads are easier to walk, and the load-loading carriages will be larger. If a heavy four-wheeled carriage weighs two tons, which is equivalent to 25 stones, and twelve heavy carriages can be equivalent to a three hundred stone ship in the inland river. 400 heavy carriages are required to be equivalent to the load capacity of a general ten thousand stone ship.

From the figures, the transportation volume of land transportation is far less than that of sea transportation or inland shipping.

However, in the end, Li Jing still felt that the land trunk line was very necessary. Because these two trunk lines were not used to replace sea and land, but as an auxiliary to sea and water transportation. The sea transport capacity was the largest, but the restrictions were also extremely high. Not only did the northern ports freeze in winter, but they could not leave the port during summer storms. At the same time, sea transport could only be transported along the coast. Inland river water transportation was also very limited, and they could only transport inland rivers, and rivers often restricted the number of ships transported. In winter, it was also impossible to transport during the freezing or dry season.

There is a small amount of land transportation, but it has the advantage that it is not restricted by weather or seasonal restrictions, and can be reached anywhere as long as there is a road.

What’s more important is that after the road is repaired, it not only transports materials, but also has a greater role in military affairs, and quickly transports troops!
Chapter completed!