Early the next morning. Pen ~ fun ~ pavilion www.biquge.info

In the thin mist, four-wheeled carriages were assembled in front of the offices of the civil affairs departments.

Many of these carriages were rented from carriage and horse dealers, and since the completion of road construction in the administrative district, four-wheeled carriages have become the first choice for many carriage and horse shops and merchants to carry passengers and pull goods.

Of course, the departments themselves also have some horse-drawn carriages for officials to travel, and they have also been requisitioned to participate in today's transportation tasks.

The administrative region of North Korea was formerly the territory of the Joseon Kingdom, and although the Joseon Kingdom learned from China in terms of culture, economy, and political system, its weak national strength made it impossible to copy China's experience in many good policies.

Just like roads, China is the first country to establish a national transportation network, and the post station transmission system is already very mature.

However, when the Joseon Kingdom was learning various Chinese systems, it was unable to do a good job of the roads in the cities, let alone the roads that spread all over the country, because of the lack of financial and human resources.

All of the Xuan Army's combat operations took place outside the administrative region.

The roads of the Kingdom of Joseon are so bad that there are almost no decent roads left in the wilderness except for the so-called roads that people have stepped on.

Due to the difficulties of land transportation, the army units of the Xuan Army had no choice but to let the command coordinate the navy's transport ships to help them transport personnel and supplies.

The army has relied on the powerful navy to transport personnel and materials countless times and defeated the strong enemy.

However, the army was very dissatisfied with the situation, not with the help of the navy, but with the fact that it could not have its own heavy artillery because of the road restrictions.

After Chen Xin occupied the administrative region of northern Korea, he vigorously recruited displaced people from all over the country to supplement his own population and soldiers.

When these displaced people came to the Xuanjun area, the first thing they did was to be broken up and organized into a task force, and let them work in exchange for food.

The first choice of work is to dredge the water conservancy facilities in the jurisdiction, which can not only prevent the displaced people from eating idle food, but also exercise their discipline and physical fitness, and check whether there are any unstable factors in the work.

This method had a good effect, and when Chen Xin led the army to the expedition, there were no major fluctuations in the townships and villages under his jurisdiction, because at the beginning, those unstable personnel were selected away.

After dredging the water conservancy facilities throughout the territory, Chen Xin chose to vigorously carry out road construction in order to arrange for the continuous influx of displaced people from all over the country, to continue to implement the policy of picking out those unstable factors in his work, and also to develop inland in the future.

The public transportation roads built in the Northern Korean Administrative Region are simple roads with dirt surfaces.

Chen Xin also knows that the traffic volume of such a road is much smaller than that of the hardened road, and once the heavy rain passes, it is necessary to send people to re-inspect, fill and repair the pavement of the dirt road.

However, in this day and age, both asphalt and cement are precious things, and it is too wasteful to pave roads.

Moreover, judging from the current development situation, for a long time, the main force of land transportation was still horse-drawn carriages.

The carrying capacity of the carriage is not too large because of the limitation of the horse's strength, so there is no need for the extravagant hardened road surface for the time being.

As a result, under the leadership of a part of professional and technical personnel as the backbone, the road construction team was formed.

Every day, the road construction team began the construction of roads in the administrative area with a large number of displaced people.

In order to make full use of the convenient conditions for water transportation of various rivers during the period of abundant water, most of the earthen roads in the jurisdiction are built along the river.

Fortunately, when Amin came to the Joseon Kingdom with him, and when he conquered cities in provinces, prefectures, and counties, Chen Xin arranged for someone to collect those local chronicles and know the amount of precipitation in all the areas he now occupies over the past hundred years.

When planning, it is possible to determine the height of the roadbed based on the historical high water level recorded in the local gazetteer, so that the road will not be damaged by sudden flooding.

At the time of road construction, the Korean kingdom was rich in plains and hills, so all the road foundations in the administrative area were filled with earth. And try to take soil from the roadside drainage ditch and nearby useless land to reduce the amount of earthwork transported.

If you want to build a highway, you need to calculate the width of the highway based on the width of the vehicles used in the administrative area.

At that time, Xuanjun already had the ability to manufacture bearings, steering mechanisms and other components, and when the highway construction was completed, the passability of the flat road would be greatly enhanced, so the four-wheeled carriage was finally selected as the vehicle that would pass through the administrative area in the future, and the width of the road was also calculated according to it.

The soil dug out of the drainage ditch next to it is screened through a sieve and a trapezoidal roadbed is laid on the ground in the form of a layer of clay and a layer of sand.

Every 20 cm of soil is filled, and a huge cement mill pulled by two dragons is used to grind back and forth, and the soil layer is compacted.

Repeat this process until you know that the subgrade is filled to the height of the design, and the entire subgrade is completed.

The most troublesome thing is the pavement of the road.

Cement is a building material that is now in dire need in all administrative regions, and it is impossible for Xuanjun to have the luxury of using cement to pave roads, at least not for paving the road network between cities.

And asphalt, more troublesome, there is no high-quality asphalt origin, relying on that little bit of asphalt in the coal chemical industry, the cost is too high, higher than cement, unless there is a natural asphalt pit can be used, otherwise, don't want to use asphalt to pave the road now.

Finally, after many experiments, a special sand was selected, which can maintain a certain density after compaction, and is not easy to loosen, after the car has passed, the dust brought up by the horse's hooves and wheels is relatively less, and the wheels are not too sticky in rainy days, which is a pavement material that can effectively reduce maintenance costs.

If a certain amount of cobblestones are added to this pavement material, the strength of the pavement can be further improved.

In order to collect pebbles, each factory and organization has assigned tasks to employees, and when they go home every day, they can see if they can pick up pebbles of the right size.

In the era of horse-drawn carriages, the traffic volume of the highway was not as huge as that of later generations, so the road surface of the highway was not paved too thickly, paved with a layer, and then compacted, and it was basically completed.

After several years of development, Xuanjun has completed the road connection between the townships in the administrative district, so that the four-wheeled carriage can smoothly pass through the administrative region of northern Han.

Although this kind of carriage is delicate, it also has the advantages of large load capacity and less bumps. It is already the standard configuration in the northern administrative region of Xuanjun.