Liu Yiyu recalled how the kang in the north was dug and burned.

Liu Yiyu has a little impression in his memory that the kang dug in the north seems to be digging a pipe under the kang, and after the heat is directly connected to it, there will naturally be heat in the room.

As for how to dig the kang in the ancient north, it seems that the principle is similar to that of modern times, all of which are to dig a big hole under the kang where you sleep, burn a few pieces of firewood, and then close the air door, you can burn for a night, keep the kang not cold, or the temperature in the room will not decrease.

Since the principle is similar, Liu Yiyu thinks about this, as long as he digs a deeper hole and burns more firewood, he can naturally ensure that the temperature in the cave rises.

Liu Yiyu thought that this method was feasible, Liu Yiyu walked around the entire bamboo house cave, and carefully scrutinized it, needless to say, behind the cave, it is inconvenient to burn the fire, and the location is not the best.

On the left is the chicken coop and vegetable patch, which is not suitable, the most suitable place, but the place next to the kitchen on the right, not only digging the kang or burning the kang, it is very suitable.

Since he decided to dig the kang, and after deciding on the location, Liu Yiyu pondered and deliberated, since he dug the kang by himself, he had no experience, but just based on his own conjecture.

In this case, the passage dug under the cave should not be too deep, and if it is too deep, it will not be able to burn, and the heat will not be able to spread to the cave, and it will be useless if it is burned.

The digging was too shallow, and Liu Yiyu was afraid that people would walk in the cave, afraid that it would collapse.

Liu Yiyu pondered and decided to dig two passages under the cave to burn the fire and heat the kang.

Digging two channels, can not dig straight lines, must be curves, used to disperse the force, digging shallow will be so easy to collapse.

Now that he has decided, Liu Yiyu told Liu Li and his younger siblings about his thoughts.

After hearing the words of their eldest sister, Liu Li and Liu Yiyu also felt justified and prepared to do a big job.

After the third day of Liu Zhang's serious illness, Liu Yiyu's newly bought cotton was also made into a three-bed quilt, and the original door of the cave was a curtain made of straw and rags, which was used to shield the wind and cold in winter and prevent the wind and cold from entering the cave.

As time went on, it was getting colder and colder, and the curtain made of straw and rags didn't work.

Liu Yiyu pondered, there was some cotton and coarse cloth, and Liu Yiyu asked Liu Li to make a quilt the size of a cave curtain to shelter from the cold wind and snow.

Fortunately, after Liu Zhang took medicine and ginseng for three days, his condition gradually improved and he was able to eat some food every day.

Yesterday, Liu Yiyu also invited Zhang Langzhong to diagnose Liu Zhang's pulse, saying that Liu Zhang's condition is now stable.

Zhang Langzhong, who diagnosed Liu Zhang's pulse, felt strange, the Liu family had no money and couldn't buy ginseng, how could Liu Zhang's be saved, and stabilized the condition, and the condition was developing in a better direction.

"We have some friendship with the old man of Deren Hall, this ginseng, and the same old She." Liu Yiyu explained after seeing Zhang Langzhong's strange look on his face.

Liu Yiyu did not avoid Zhang Langzhong's suspicion, and directly found a reason to shirk.

"No wonder this is the case, as long as the aunt's illness is being regulated, the yin and evil and damp cold of the cave are expelled, and the body is replenished, the aunt's body can also be slowly adjusted." After Zhang Langzhong heard that the ginseng of the Liu family came from Derentang to find the old man, Zhang Langzhong looked at the Liu family's family with some pity.

If this ginseng and medicine money were all found by She's Derentang, this silver money, I am afraid that it will cost at least ten taels of silver, and this Liu family is afraid that this generation will have to work for the elderly.

Zhang Langzhong took pity on the Liu family, and did not charge the Liu family's consultation fee, so he left.

On this day, the Liu family started to dig a passage under the cave and burn the kang.

Liu Li took the seventh brother and the eighth sister to guard Liu Zhang's in the cave, up to Liu Yiyu, down to Liu Yimeng, and came to dig the kang today.

Liu Yiyu took Liu Yihao, Xun'er, and Liu Yimeng to dig the kang, Liu Yiyu mainly hoeed, Liu Yihao and the three of Liu Yiyu dug up the soil and stones, and transported them away, and the other group was Liu Yishuang with Liu Yisa, Liu Yiya, Liu Yishuang mainly hoeed, and Liu Yisa and Liu Yisa dug up the soil and stones dug out by Liu Yishuang and transported them away.

Liu Yiyu told Liu Yishuang about the idea, depth and width of digging the kang by himself, and Liu Yishuang signaled that he knew it and began to dig the kang.

Liu Yiyu planned to dig two kangs under the cave, and the two kangs would cross and converge, so that the two kangs could ventilate each other.

About a foot and a half from the ground of the cave, start digging, digging one foot wide and one foot high.

This kang digging is very difficult, this digging, is a week, a dig kang this kind of work is heavy, the Liu family sisters and brothers are some girls and children, just digging the kang, transport the soil away, but also tired a few girls and children don't want it.

Even Liu Yiyu and Liu Yisa are the two main hoes, not to mention the back pain when digging back, but also full of blood blisters, the kang is not big, the whole person has to lie in the passage to dig out the soil and stones, if the digging position is not long enough, I am afraid that the left side of the cave will not be burned, and the whole cave will burn the kang, I am afraid that half of it will not be burned, resulting in insufficient heat in the cave.

However, after Liu Li saw his children digging a kang under the cave, digging for a week, and they were all tired, and Zhang Langzhong also said that Liu Zhang's needed to make up for his body, Liu Li was ruthless and killed a chicken to make up for everyone.

The seventh brother and the eighth sister have not been idle these days, doing some simple things at home, feeding the chickens and collecting firewood, and the two of them are also filial to feed Liu Zhang's medicine.

After these seven days of conditioning, Liu Zhang's family slowly developed in a better direction.

"Eldest sister, you are also tired, or I will come, I am small and thin, people can climb in and slowly dig out the dirt and stones." Liu Yihao saw that his eldest sister was tired and sweating, and the whole person was lying on the ground, bowing down, holding a hoe in one hand, reaching into the passage dug below, twisting his head to the side, frowning and digging the soil, Liu Yihao felt a little sorry for his eldest sister.

"That's it, the eldest sister rests for a while, you be careful, dig slowly, don't get tired, dig a foot and a half, the eldest sister estimates that this is almost the same as the channel dug by the third sister should converge, after the confluence, this burned kang is completed, and then let's make two more dampers, burn the kang for a day, and look at the results of our sister and brother in the past few days." Liu Yiyu wiped the sweat on his head, digging the kang in the past few days, but he was tired, Liu Yiyu handed the hoe to Liu Yihaodao.

"Cheng, eldest sister, I know." Liu Yihao took the hoe in Liu Yiyu's hand, Liu Yihao spat on his hand, wiped it, took the hoe, bowed down, and slowly entered most of his body, and a little bit of dirt and stones were dug out of it.