After a pause, Ah Xian waved his hand again and explained: "It's just been renovated, but in fact, the internal structure has long been destroyed, and the toughness is very poor, and sooner or later there will be problems." Experienced teachers can see it at a glance! ”

Xun Mu sighed: "The master can see at a glance that their safety officers and supervisors are good, and they haven't found any clues so far." ”

"yes, there might be a problem here." Ah Xian nodded slightly, and then said, "But...... Other steel cables have also been renovated, but they are not so easy to damage, this steel cable is not even refurbished, and it is even rusty on the top, which is very strange. ”

Su Ping thought for a moment, and then said, "First screen out the people who may have touched this tightrope." The tightrope is thicker than the thumb, and it is so long, it is quite heavy in itself, and it is not easy to hide, so it should not be difficult to find the suspect who replaced the tightrope.

In addition, send two more people to check where the steel rope was purchased from, and who is responsible for purchasing and inspecting, and make a list for me. ”

"Okay." Ah nodded first and went back to work.

Su Ping thought about it, picked up the walkie-talkie, and asked the group of people in charge of Brother Song to stay, and the rest to call it a day.

At present, this case is that he and Xun Mu are a little too sensitive, and the difficulty of the investigation itself should not be great, and there is no need for so many people, and the police force is wasted in vain.

Then he looked at Xun Mu again and asked, "Old Xun, you just talked to those reporters, didn't say anything?" ”

"No, let's just say that we are not sure whether this case is accidental or man-made, and we will immediately launch an investigation and determine as soon as possible." Xun Mu said: "There are also reporters who have paid attention to more than ten previous 'accident' cases, and I have prevaricated and perfunctory past. ”

"That's good." Su Ping said: "Then you don't need to pay attention to public opinion for the time being, just leave it to the colleagues in the Public Opinion Department, and concentrate on solving the case first." ”

"Hmm." Xun Mu took out a cigarette, lit it, looked left and right, and said, "Now there are two possibilities.

Or, the steel rope they bought is just a simple fake and shoddy product, and the quality is extremely poor, and there may be a lot of dirty things hidden in it, such as the people in charge of procurement in the construction team, as well as the quality inspectors and safety officers are taking kickbacks with luck.

If this is the case, I am afraid that there is likely to be a construction accident at this construction site, but it is a coincidence that some criminals have other purposes to replace one of the steel cables.

Or, there is a conspiracy hidden in the purchase of steel cables, and someone is deliberately calculating this construction site. To put it simply, there are two groups of people, for various reasons and purposes, who want to create construction accidents in this market.

It's just that one side chooses to cast a wide net, and the means are relatively clever and secretive, using products of very poor quality but no problems on the surface of the layman; The other side is much more simple and crude, and the criminals themselves may not have any brains. ”

"But in any case, this case can basically be characterized as a man-made crime." Su Ping also lit a cigarette, took two puffs, and after listening to Xun Mu's words, he said: "Anhe Group must be able to breathe a sigh of relief." ”

"It's not that easy." Xun Mu spit out a smoke ring and said: "Anyway, there are potential safety hazards in the rest of the steel cables, and even other machinery and equipment may also have problems, but they did not find it, which shows that there are problems in the supervision of this part, and there is no shirk."

Even if this case is artificial, they must stop work for a period of time and reopen after rectification. ”

Su Ping said softly.

Xun Mu snorted: "That's right. ”

"Don't pestle here." Su Ping glanced at Qi Yuan and Brother Song again: "Smoke a cigarette and rest for a while, and continue to visit after smoking." The focus was changed slightly, asking them about their daily work on the construction site and their daily safety checks. ”

"Okay." Brother Song bowed his head, and then shook his head: "Don't smoke anymore, go straight to work." Xiao Qi, let's go. ”

"Hmm." Qi Yuan hurriedly followed.

……

The investigation went quite smoothly, and in the evening, two lists were sent to Su Ping.

A list of the purchasing department, which also includes the sellers of steel ropes and other important equipment and their contact information, as well as the names of the people responsible for the daily routine inspections.

The other is a list of the building's construction workers, from engineers and safety officers to the most ordinary workers.

"Why are there so many people?" Su Ping asked with some confusion: "Forget the first one, why is the second one so much?" Do they all have a chance to replace the tightrope? ”

"Hmm." Ah Xian nodded and said, "When you bundle steel bars and hang them upstairs, you may be called over to help if you are a person on the construction site." ”

"With so many people, none of them found a problem with the tightrope?"

"Nope." Ah Xian shook his head: "And according to the visit, they all said that the steel cables were still very new when they were working this morning - the big guy was going to come to inspect, of course they also attached great importance to it, and the supervision of safety was stricter than usual, and there was no problem at all." ”

"That's weird." Xun Mu said: "There was no problem with the steel cable before, how could it suddenly rust and break?" ”

At this moment, Xun Mu's mobile phone rang.

He immediately found out and found that it was Chai Ningning calling, so he immediately connected and asked, "Xiao Chai, what's wrong, did you find something over there?" ”

"Important findings." Chai Ningning's voice came out of the speaker: "Our laboratory found the existence of copper ions and sodium ions on the steel cable, and after repeated inspections, it was found that someone made a mixed solution spray with sodium chloride, copper chloride and acetic acid and sprayed it on the steel cable. ”

Xun Mu blinked, didn't understand, so he had to ask again, "What do you mean?" ”

"To put it bluntly, it is a copper salt accelerated acetate spray test," Chai Ningning explained: "This is a rapid salt spray corrosion test developed in Xinjin, and it is also one of the fastest methods in the industry to test corrosion resistance."

Specifically, it is used to test the corrosion resistance of industrial materials, including iron, at extremely high speeds, which is a destructive experiment. The principle is to use the copper salt in it to replace the copper, and together with the iron to form a corrosive galvanic battery.

The steel cable used on the construction site, after testing its corrosion resistance and toughness, is not very good, coupled with someone spraying this salt spray, after proper heating, the steel cable can be corroded in just one minute, destroying its internal structure.

Even if it is not heated, after an hour or two, the steel cable will be almost destroyed, and naturally it will not be able to bear the weight of the steel bar, resulting in cracking, and finally the steel bar will fall from a high altitude, causing this tragedy of five deaths and four injuries. ”