After yesterday's surprise cleanup, there are no traces of zombies on the construction site now. Due to the urgent evacuation of the workers, the building materials and machines on the construction site are scattered and scattered, and the door is also open in the shed, and the gray high and low beds are faintly visible.

Knowing that there were a lot of items that could be used here, Du Yunfei was not in a hurry. Everywhere he went, he quickly scanned the objects around him, as if he was conducting a highly targeted search.

Su He finally couldn't help but ask him, "What are you looking for?" ”

"Water purification materials."

"Dare you be more specific?"

"Large and small stones, coarse sand, fine sand, charcoal, large containers, water pipes."

Du Yunfei reported the names of a string of materials, and the two of them looked at it while walking, and soon made various discoveries.

Since it is a construction site, the amount of gravel and gravel is not small, and there is also a lot of fine sand. In addition, large and small pipes and fittings are dazzling.

Du Yunfei found a dump truck, collected these materials with the assistance of Su He, and then stacked them in the center of the clearing. No charcoal has been found on the site for the time being, but there are many trees in the botanical garden, so it is not a problem to prepare some charcoal.

This is because it is not only a filtration device, but it does not need to have a water storage function. So Su He scooped up an empty bucket of pure water from the dormitory of the shack, which was almost enough in size.

And just as they were about to call it a day, Su He accidentally pulled out five large boxes of activated carbon dust removal masks from the warehouse - this luck made Du Yunfei secretly impressed.

At the same time, in the canteen of the construction site not far away, Duan Whale and Lin Youqing were also constantly busy.

The site canteen is broadly divided into five areas - a dining area, a food preparation area, a cooking area, a processing room and a storeroom. There wasn't much to say about the first three areas, but the processing room and the warehouse were a pleasant surprise.

On the stainless steel shelves in the food processing room, cabbage the size of winter melons is stacked on two floors, pumpkins and potatoes and corn cobs wrapped in numb bags are stacked against the wall, and eggs in egg cartons are stacked half a person high - even Lin Youqing, who offered to come here to take a look, was dumbfounded.

But even bigger surprises are yet to come.

Next to the food processing room is the warehouse. The storeroom is about the size of a classroom. There is a row of large shelves on the root of each side of the wall, on which are stacked with various bottles and cans, as well as large sorting boxes; In the middle of the open space are stacked with bags of hemp.

Walking in again, a variety of familiar names come into view: "Zhenhai Aged Vinegar", "Photosynthetic Sufu", "Wong Kum Kee Soy Sauce", "Lao Gan Pap Chili Sauce", "Lao Si Brand Dry Yeast", ......

The sorting boxes on the side are also labeled: shiitake mushrooms, fungus, dried chilies, cinnamon, five-spice powder......

Lin Youqing gasped: "We have everything we should have, we can open a restaurant at the end of the world." ”

"And that's not all."

Duan Whale asked him to look back at the pile of sacks in the middle—starch, rice, flour, and glutinous rice—like a small mountain.

Lin Youqing looked at Yiqiqi in front of him in a daze, and it took a long time to come back to his senses: "Haichen, they set off too early...... What if I come back with a lot of food. ”

Worry is worry, but it's better than nothing. Without further ado, the two of them found a small cart to transport vegetables in the canteen, and began to carry the ingredients, and it took more than ten trips back and forth to be considered all done.

After seeing that the hour was almost up, the two drove back to the agreed place. Su He and Du Yunfei were already standing there waiting with water purification materials. The two of them got into the car and coldly faced the extra half of the truckload of supplies, and they were a little confused.

Seeing that the car was full, they had to change their plans on the fly. Return to the villa first and put the ingredients down. Du Yunfei's water purification materials were also stacked on the edge of the antiseptic wood pergola outside the house, ready to be assembled.

It was almost noon, and several people took the biscuits and drinks that Duan Whale had bought from the gas station the day before yesterday to fill their stomachs, and quickly stood up again to prepare for the next important thing -- to build a wall on the other side of the bridge.

Unlike Duan Whale and the others, who had been bored in the canteen just now, Du Yunfei and Su He had been wandering around the construction site for a long time, and they had already seen all kinds of building materials. As for the materials for the construction of the barricade wall, they have apparently also thought about it.

Du Yunfei first gave a series of specific figures: "According to my previous visual inspection, the width of the main bridge of the cross-sea bridge is about 25 meters. Assuming that the height of the wall we want to build is three meters, then the total area of the wall we want to erect, including the gate, is at least 75 square meters. It takes 280 standard bricks per square meter to build a 24-centimeter-thick ordinary brick wall, and a skilled worker can only lay 1,500 to 1,800 bricks per day. ”

"In human terms."

Su He thought he was talking awkwardly, so he jumped out and simplified: "If you build a wall according to the ordinary method, even if four skilled workers don't eat or drink, it will take three whole days, not counting the work of moving bricks and adjusting cement." ”

Lin Youqing was also stunned when he heard it: "It turns out that Dr. Du also has research on architecture. ”

"I've helped build reservoirs and sanitation facilities for local people in Africa." Du Yunfei replied simply.

Duan Whale agreed with their estimation and asked, "Then what plan do you have?" ”

"Rapid wall construction." Su He showed a smug look, "You need to use bricks, colored steel and concrete." I'll tell you how to do it......"

Next, he briefly described the new method of building the wall, which was really convenient and fast. Without further ado, everyone began to prepare the materials, all of which were stacked on the construction trucks, and then took the shovels, trowels and other tools they had found from the construction site, and drove towards the outside of the botanical garden.

The four black iron gates of the Botanical Garden are still tightly sealed. Lin Youqing got out of the car and observed the situation through the crack in the door, and only after making sure that there were no zombies outside, did he open the door.

Yesterday afternoon, the zombies that were pulled by Haichen and them from all over the place were piled up in the large round pool outside the door, and there was no change at this moment. However, Du Yunfei, who saw this scene for the first time, frowned.

"On the humid and warm island in April, more than 60 hours of death, the internal organs should have started to stink a long time ago, do you smell it?"

When he said this, others began to realize that there was a problem. Although I smelled a strong smell of blood when I was carrying the corpse yesterday, I didn't feel the stench of the corpse at all.

The car had already driven to the edge of the round pool, and Su He, who was sitting in the car body, poked his head out to look, only to see that the corpses piled up in the pool were covered with a layer of black shade cloth, but he could still see an indescribable strange liquid flowing out from under the cloth.

I don't know if it's a **, but the rancid smell really doesn't have at all. Not only that, but the smell of blood in the air was gone.

"Maybe it's the zombie virus that's working."

Du Yunfei gave a more likely speculation: "This virus is inhibiting the activity of anaerobic bacteria, and perhaps they, like bacteriophages, will also feed on anaerobic bacteria." This is also why zombies are still able to maintain some of their bodily functions after death, and do not decay quickly. ”

"That doesn't sound like a good thing," Su He sat back in the car, "I can't wait to try what this virus does to plants." ”

As he spoke, the car drove out of the small square outside the botanical garden. After driving through a triangular traffic island, you will get on the approach bridge of Foguang Bridge in front of you.

According to the previous plan, they first went to the other end of the bridge, where the first wall was built.

The construction truck soon drove on the 800-meter-long main bridge deck. The cool and comfortable sea breeze blows on people, bringing a lot of relaxation and happiness.

The destination arrived quickly. After confirming that there were no zombies in the visible range of the field of vision, the construction truck came to a steady stop. Su He and Du Yunfei put down two small narrow steel plates to make a ladder, and the four of them began to use board trucks and bucket trucks to transport construction materials to the bridge deck.

This part in front of you is the junction of the land approach bridge and the main bridge. After Duan Whale measured it with his feet again, the width of the two-way four-lane bridge deck was indeed about 25 meters.

According to Su He's previous plan, he and Du Yunfei spread out a roll of waterproof membrane on the ground, and mixed several large bags of lake water in black garbage bags, dry cement and fine sand on the construction site according to a certain proportion and amount. Duan Whale put the evenly mixed mud into the mud bucket and walked to Lin Youqing's side.

Just now, Lin Youqing had already pulled up a 25-meter-long straight line between the guardrails on the left and right sides of the bridge deck. Now they started laying bricks on the right side of the bridge according to this parallel line. Unlike the normal wall building method, the wall they are building is only about 0.7 meters wide. After laying 3 bricks horizontally, they immediately turned back and began to build the second floor.

On the other side, Su He and Du Yunfei finished preparing the first batch of cement, and immediately walked to the left side of the bridge and began to build the same narrow wall at the rope marker.

Although these four people have different personalities, they all work with the same focus, and in a short time, they worked together to complete two thin brick pillars that are 2.5 meters high and 0.7 meters wide.

Immediately afterwards, Lin Youqing pulled up the second and third long lines at the back one step away from the brick pillar. The four of them repeated the process just now, and then built four new brick pillars at the new rope markers.

As a result, there are three brick pillars on each side of the bridge deck, and the next part is the most interesting.

Two large sheets of colored steel walls in the body were moved to the left side of the bridge deck. The four of them worked together to erect them, each inserting it into the gap between the three brick pillars in the front and back. After Lin Youqing's calculations, the column and the wall fit tightly and were exactly the same.

Although the plan was executed smoothly, everyone did not dare to rejoice too early. They also concocted according to the law, and also erected three brick pillars at the other end of the color steel wall, which can be regarded as firmly erecting the wall on the bridge deck.

"I feel a great sense of accomplishment now, as if I had published a paper in the journal Nature." Su Yi put his hand on Du Yunfei's shoulder, panting.

"Don't get too excited, there are still three boards to erect." As Du Yunfei spoke, he naturally tested the temperature of his forehead.

In any case, the color steel ** has indeed greatly accelerated the progress of building the wall. By 3 p.m., they had completed the laying of four double-layer color steel plates with a total length of 20 meters, leaving only the middle five-meter-wide entrance gate.

Considering that the color steel wall is light in weight and large in area, and the bridge is prone to strong winds, it will cause damage to the wall. They also used the triangular bracket originally equipped with the color steel wall to temporarily support the wall before it dried, continued to modulate cement and mixed it with sand and gravel, further made into concrete, poured into the gap between the two color steel walls before and after, and piled up a solid layer about one meter high.

In this way, while increasing the weight of the wall, the center of gravity of the wall is also reduced, which further reduces the influence of wind.

The first defensive wall was a success, but the gate was not immediately installed on the pillars, considering that the cement had not yet dried.

After the work at hand was done, Su He took out his mobile phone and asked Lin Youqing to help him take a photo with the wall. The photo was taken, but I found that there was nowhere to upload it, and I was stunned for a while.

In any case, with this wall, the safety of the botanical garden in the future is like a double insurance.

The voice of Haichen and Lu Rulan returning safely came from the walkie-talkie, which had been silent for a long time, and everyone simply packed up their things and boarded the car to return, and drove directly to the coast, and saw that Haichen's love ship had stopped on the shore.