Zhao Ming, deputy general manager of Yuehai Shipping Engineering Co., Ltd., also arrived at the scene, and of course their owners also attach great importance to this matter, after all, if they do not find the cause of the problem, it will seriously affect the construction period.
Zhao Ming said to Luo Fei: "Mr.
Luo, how do you think this is good?"
If it affects the construction period, it will not be good!
” Luo Fei said in a deep voice: "Don't worry, Mr.
Zhao, we will definitely find out the reason as soon as possible, according to the preliminary judgment of our company's chief engineer, there are some problems with the quality of this batch of PHC pipe piles, and now we have sent a letter to the pipe pile supplier, and called its person in charge, and immediately sent someone to deal with the matter." ” This time, Linhai Concrete Company sent Duan Yongfu, the chief engineer, to go out in person, and Song Zhirong, the deputy manager of the sales department, to follow.
Of course, Duan Yongfu brought Li Fusheng with him again.
In the car.
Song Zhirong also said worriedly: "Mr.
Duan, what's going on?"
Our company's recent PHC pipe piles have no quality problems, why did they have problems in Changxing Island?
” As a salesperson, Song Zhirong doesn't know much about technical things, but only understands some skins, so he asks so much.
Duan Yongfu said in a deep voice: "Only when you arrive at the scene can you draw conclusions through careful analysis.
At present, our factory inspection is very strict, logically speaking, it should not be a problem with the quality of the pipe pile itself, but a problem in the construction process. ” Saying that, Duan Yongfu found that Li Fusheng listened very carefully, so he continued: "For example, the occurrence of pile fracture, in the process of sinking the pile body, suddenly tilted and dislocated, when the soil conditions at the tip of the pile do not change specially, and the penetration resistance suddenly increases, and at the same time, after the pile hammer jumps, the pile body rebounds, and then it may be a pile fracture.
There are many reasons for this situation, such as the slender ratio of the pile node is too large, and the harder soil layer is encountered after sinking, which will not be the case in the current situation, then there is a large hard obstacle encountered after the pile enters the soil, and the pile tip is squeezed to one side, or the pile is not vertical when the pile is stabilized, and the pile body is bent after laying a certain depth, etc. ” Li Fusheng said curiously: "Chief Engineer Duan, what if the top of the pile is cracked?"
” Duan Yongfu nodded and said: "Yes, in addition to the cracking of the pile body, the cracking of the pile top is also a relatively common pile sinking quality problem.
The reasons for this are also varied, such as the uneven top surface of the pile, the plane of the top of the pile is not perpendicular to the axis of the pile, and the improper maintenance of concrete, which is a possible problem in the quality of the pile itself.
In terms of construction technology, the possible situations include, the contact surface between the pile top and the pile cap is uneven, the pile is not vertical when sinking, the pile top is not padded or the liner is damaged and not replaced when the pile is sunk, and then there is the improper selection of the hammer weight, if the pile hammer is small, the pile top is hit too many times, the pile top concrete is easy to produce fatigue damage and break, if the hammer is big, the impact force is too large, and the pile top concrete can not withstand the excessive blow force and breaks. ” Li Fusheng was once again deeply taught, it turned out to be an ordinary PHC pipe pile, and there will be many reasons for quality problems, which are all experience summaries.
Of course, Li Fusheng doesn't want to have a problem with the quality of PHC pipe piles, because in that case, it is the responsibility of their technical quality department, of course, the production department may also be responsible, no matter how there is a quality problem with pipe piles, all their relevant responsible personnel will be fined at least a month's bonus, and the loss will be hundreds of yuan.
Even more serious, it is possible to be demoted and dismissed, which Li Fusheng does not want to see, because he has already encountered it once in Jiatai Concrete Company, and that time he did not understand anything and suffered an unjustified wrong.
Now he doesn't want history to repeat itself again, of course, Chief Engineer Duan will definitely not be the same person as the director last time, Chief Engineer Duan is a very responsible expert, even if there is a real problem, he will most likely find a way to take the responsibility on himself, and he loves his subordinates very much.
Seeing Li Fusheng's worried look, Duan Yongfu said with a smile: "Xiao Li, don't worry, since our company's products are inspected in strict accordance with the quality management system, then we have to believe in ourselves."
When we get to the scene, the specific reason will soon be figured out. ” Li Fusheng nodded and said, "Well, Chief Engineer Duan, I believe we have no problem!"
” When the three of them arrived at the construction site, Luo Fei and the others were still directing their quality inspectors to inspect the damaged piles there.
Luo Fei saw Li Fusheng and them coming, and hurriedly stepped forward and said, "Chief Engineer Duan, Manager Song, Fusheng, look at this matter!"
Am I a layman, or do you technicians discuss it and see what causes it!
” Duan Yongfu said: "Of course, after receiving your letters and calls, our company attaches great importance to it!"
It can be said that in the last two years, our company has never encountered such a serious problem. ” Shi Qiang hurriedly said: "Okay, Chief Engineer Duan, let's not talk so much, let's go and see the situation of the pile first!"
” The two experts went over to see the situation of the pile, and at this time Luo Fei looked at Li Fusheng and said: "Fusheng, it seems that you are in your company, and you are very valued by the leaders, and you were sent out again this time." “ Li Fusheng hurriedly said: "Mr.
Luo, I just followed the leader to learn."
Why don't we go over and have a look?
” Luo Fei nodded and said, "Okay, I also want to learn!"
” At this time, the chief engineers of the two companies were already there to analyze, and when Li Fusheng and them passed, Chief Engineer Duan was forcefully refuting Shi Qiang's argument that this was the reason for the quality of the pile itself.
Chief Engineer Duan pointed to the hammer on the pile driver and said loudly: "Mr.
Shi, if you tell us earlier, I can help you review the implementation plan of the first trial pile test, to be honest, the size of the pile hammer of your pile driver has a problem!"
” Shi Qiang blushed and said, "Why is there a problem?"
This has been reviewed by the owner, the supervision unit, and the design unit, how can there be a problem!
” Seeing that Luo Fei also came over, Duan Yongfu also said loudly: "Originally, you chose the hammering method, which is actually not very appropriate, but because the pile driver is inconvenient to transport, I won't say much."
However, the hammering method is to use the impact force generated instantaneously when the pile hammer falls freely to hit the pile head, and produce a strong impact mechanical energy to overcome the resistance of the soil to the pile and make the pile sink.
However, the choice of pile hammer also has to take into account many conditions, the total importance of the general hammer is greater than the pile weight, but I took a look at the plan, the pile hammer you choose is too light, or according to the ordinary medium diameter pile that is, the 600 mm diameter pile to choose, so it is obvious that the pile hammer used to hammer the 600 mm standard pile, the weight can not reach the weight of the 800 mm pile, so that the number of hammers is too much, which will inevitably lead to the current result, that is, the pile head is broken because of fatigue. ” In the face of Duan Yongfu's powerful counterattack, Shi Qiang felt very powerless, and he was indeed negligent in the preparation of the pile test plan.