Low-tech safety standards for manhole covers.
The "paper sheet manhole cover" is actually a fiber composite material. These batches of manhole covers were adopted in the subway landscape project in 2010, and they are all located in the green belt, with the strength to withstand adult stepping. It was initially determined that the bad well cover was damaged by rolling of the vehicle. (Overseas Network July 8)
The "paper sheet" manhole cover is today made of a "high-tech" fiber composite material that is strong enough to withstand adult treading. Is this true? The author even questioned how such a fragile manhole cover went through the bidding process. Can this "high-tech" manhole cover really control the "low standard" safety?
Security is no small matter, and pinning citizens' safety on such fragile "paper" manhole covers is itself a disrespect for the people's lives and a serious lack of awareness of safety responsibility. If the broken manhole cover is really damaged by the rolling of the car, may I ask, can the “reinforcing steel” with the thickness of chopsticks be able to withstand the weight of one ton and a half of the car? I think the answer is self-evident.
Although it is fortunate that the damaged manhole cover did not hurt the local people this time, the safety of a moment does not mean the safety of the whole life. Whether the "fiber composite" manhole cover can withstand the stampede of year after year cannot be used for the lives of citizens test! If it is really for the sake of the people, then replace the manhole cover that is “broken with a touch” with a manhole cover of good quality in exchange for the applause of the people!
I admit that I am not an expert in material mechanics, but it seems that a manhole cover that can be broken by hand can be more secure than a cement manhole cover? I'm afraid not. From the photos of the manhole cover, the manhole cover has become fragmented due to external forces. If it was crushed by a car, the wheels of the car would inevitably sink into the well. However, no one has witnessed the car sinking, which proves that the damage is most likely not caused overnight, but is stepped on or crushed over time. The "pulverizability" damage caused by pressing. Obviously, compared to cement manhole covers, such manhole covers are not as strong as the official claims.
So, since it is not as strong as a cement manhole cover and there are certain safety risks, why should we use this "fiber composite" manhole cover? If it is to save money, how much is saved and where is the money saved? Should the government give the public an explanation and answer? The "high-tech" manhole cover here can't control the "low standard" safety, so let the manhole cover return to "primitive".