Jumping to conclusions without a thorough understanding of a matter or the background of the incident will lead to wrong judgments and wrong decisions.
Any project, no matter how big or small, is time-consuming and labor-intensive.
If complete construction coordination arrangements are not made in advance, problems will definitely occur during the construction process.
Although, their understanding of these two underground passages is limited to the markings on the drawings, and no one among them has conducted on-site inspections.
However, what Yong Ming can be sure of is that these two exposed and hidden underground passages will definitely not be so narrow and difficult that they can only crawl forward.
Italian missionaries would not embarrass themselves in this way, so after these three underground passages are built, they will be able to ensure that people can walk upright when passing through them.
Under such conditions, the width of the passage must also meet certain requirements. While ensuring ventilation to obtain sufficient oxygen, it must also be able to facilitate the transportation of items.
From this point of view, the width of the underground passage must be at least enough to allow three people to pass through easily side by side.
Of course, because these three channels play different roles, their specific widths may also be inconsistent if their lengths are different.
Based on the existing conditions and from a conventional perspective, take the underground passage from the "red wine cellar" to the Italian missionary's personal residence as an example to analyze the total amount of earth and stone that will be generated during the excavation and construction process.
Project quantities are estimated.
The specific parameters for this set calculation condition are as follows: the height of the underground passage is two meters, the width is one and a half meters, and the length is seventy meters.
We directly ignore other construction styles of the underground passage and calculate based on the fact that the underground passage is in the form of a rectangular parallelepiped. Then the construction of this rectangular underground passage will basically produce 210 cubic meters of earth, rock and muck.
Then, without considering the actual proportion of soil and stone, excluding uncertain projects, and calculating based on the average weight of one cubic meter of muck mass being one and a half tons, during the construction process of this underground passage, approximately
Two hundred and ten cubic meters, that is, the amount of earthwork weighing 315 tons.
You will find that the amount of earthwork and stonework generated during the construction of this single underground passage, which is less than 100 meters long, is huge.
If such an excavation and construction project were carried out today, it would not take long to complete with the participation of shield machines, excavators and slag transport vehicles.
However, this underground passage was built in the late Qing Dynasty and the early Republic of China. Without mechanized equipment to assist in construction, such a project volume required manual excavation and manual trailers to carry outbound transportation as the main construction force.
It is a project with a very huge amount of work.
This is just the relevant data of the earthworks calculated during the excavation and construction of one of the underground passages.
If we include other engineering aspects when constructing underground passages, such as the actual use of wood, columns, stones and cement required to support and strengthen the passage, the pipelines required to operate the passage, the laying and installation of access control and lighting, and the prevention of underground water
The demand for building materials is also considerable for projects such as the waterproofing construction of the passage and the installation of auxiliary facilities and equipment to maintain ventilation and oxygen delivery in the passage.
Therefore, it would be too conspicuous if the excavation and construction of the underground passage were carried out separately and the amounts of work from these aspects were combined.
Therefore, the most secure construction plan is that the excavation and construction of the underground passage will be carried out together with the construction of the mission hospital.
On such a large construction site, the underground tunnel excavation project is hidden in it, so it is not very noticeable.
In order to "build the plank road in the open and cross the Chencang in secret" to cover the eyes and ears of others, the situation at that time must have been that the construction of the three underground passages must have started at the same time after the construction plans were designed.
From the little information revealed in this drawing, Yong Ming conducted in-depth analysis and speculation on this.
From this, Yong Ming was able to perceive part of the Italian missionary's character traits.
The drawings are hand-drawn, and the architectural details of each part are drawn in great detail.
For the annotation of key parts, when indicating the name of the attributes here, there are also specific instructions on form and size.
The upper part of the drawing is an overview of the mission hospital, and the lower part is an exploded view of the various buildings.
The entire drawing was made in great detail, and the project planning was scientific and reasonable. If Xie Liuyun, a former bridge engineer, had seen it here, he would probably have praised it.
As the chief designer of this mission hospital, the Italian missionaries must have personally conducted surveys and measured the specific dimensions of the construction site that was about to be developed and built as a mission hospital.
This is a traditional practice inherited by Western missionaries and Eastern monks when building churches and temples.
While being proficient in doctrine and Buddhism, every highly respected missionary and monk who has profound attainments in theology and Buddhism will also be a master in architecture.
The construction of their churches and temples embodies their thoughts and pursuits, and is where their hard work lies.
Therefore, people often say that this building is a solid art, a three-dimensional representation of culture, containing the history of a nation and religion, and reflecting a strong humanistic spirit.
Appreciate a church or visit a temple, and you will get to know the person who originally built it.
Through this drawing, Yong Ming felt the low-key and rigorous style of the Italian missionary.
When he was building a church, he also planned and built a church hospital, and extended a helping hand to people in need in a timely manner, which shows that this Italian missionary had a philanthropic spirit of saving lives and healing the wounded.
Of course, the drawings also reveal a different feeling, indicating that this missionary hospital also has an unknown mystery.
This missionary hospital left behind by the Italian missionary must have a story that has not yet been exposed.
Yong Ming is willing to spend time to research and explore this, and perhaps he will gain something unexpected here.
Yong Ming continued his analysis along this line of thinking and felt that the construction method of the most important underground passage was definitely different from the other two underground passages, and the excavation and construction process would not be the same.
If this is not done, it will be impossible to effectively protect this secret underground passage.
So, what kind of measures are effective protection?
After Yong Ming thought of this, he couldn't help but look up in all directions of the street, looking for the answer in his heart.