Manufacturing technology of manhole cover

1. Raw material storage

A. Glass fiber testing: testing the moisture content, length and alkalinity of glass fiber.

B. rebar detection: detect the tensile force of rebar.

C. detection of unsaturated resin: detect the viscosity and moisture content of unsaturated resin.

D, detecting the stone powder: detecting the mesh number and moisture content of the stone powder. The mesh number must be greater than 500.

E. Daily detection of zinc stearate: detect the HP value and moisture content of zinc stearate. HP value must be neutral.

2. Production process

A. Prepare samples according to the formula, and a certain amount of glass fiber, unsaturated resin, stone powder, zinc stearate, etc. will be injected into the mixer. The prepared samples are put into a mixer in proportion and stirred, and the original composite material is obtained after full stirring.

B, the welder cuts all kinds of steel bars according to the requirements of different manhole covers and seats, and then welds the steel frames of various manhole covers and seats according to the reinforcement ratio of different manhole covers and seats.

C, the press worker presses and shapes the steel frame obtained by mixing the original composite material and the mixer according to the press molding rules.

3. Total quality management of production process

A. The quality inspector detects the original composite material obtained by mixing materials, and tests whether the obtained composite material is fully stirred.

B. The quality inspector shall check the steel frames of the left static and cover plates welded by electric welding, and check whether the steel bars used are correct and whether all welding points are welded.

C. The quality inspector monitors the molding process of the press workers, and checks whether the steel frames and pressed products placed by the press workers are correct, whether the placed composite materials meet the requirements, and whether the mold temperature setting is appropriate. Whether the molding time meets the requirements.

D, the quality inspector detects the finished product, and detects the appearance, color, size, etc. And the compressive load capacity after cooling.

One day, my mother took me out for breakfast and walked. Suddenly, I saw a manhole cover was not covered properly. I took my mother's hand and said to her, "Let's cover that manhole cover!" " Mom said without looking back, "We didn't do it, so mind your own business.

"I have to follow.

We are full, and I jump and jump happily. Suddenly, I plopped into the well.

I shouted in despair, "Help! Help! " My mother heard my crying and immediately ran over and stretched out her hand to pull me up.

When she saw my wound, tears swirled in her eyes like pearls.

I said, "Let's cover the manhole cover quickly!" I cover the manhole cover with my mother.

Through this incident, I understand that we have done an easy thing, which is not only convenient for others, but also convenient for ourselves.

...

There is a manhole cover missing from the roadside. About 200 words, there is a manhole cover missing from the roadside. On my way home from school, I found a big hole in the middle of the road. I took a closer look. It turned out to be a sewage well. I looked down and it was dark inside. I can't help being a little scared and thinking, "What if someone falls down carelessly?" We must find a way.

So, I started looking around. When I looked up, I saw the free market in front of me. I think, if I go here, maybe I can find a big basket and cover the manhole cover.

Thinking about it, I went in. I found a big basket in front of a cucumber stall. I picked up the big basket and walked forward. I found a big blackboard in the corner. I was so happy that I returned to the road with the big board. I first buckled the big basket on the well, then took out the watercolor pen and wrote four striking characters "Be careful of danger" on it. Finally, I put it on the basket.

"Oh, you're finished.

"I am very happy to see that drivers and pedestrians can walk around the danger and I am very happy to go home.

On Sunday, her mother took her to grandma's house and wrote 350 words on the manhole cover.

Walking along the way, I just saw that the manhole cover on the side of the road was not covered properly.

He said to his mother, "Mom, the manhole cover is not covered properly. Can I cover it? " Otherwise, it will be dark. What if people accidentally fall in? "Mom said," It's none of our business.

"So, pull up and left.

They finished their dinner at grandma's house, and it was already dark.

They are walking on their way home. They just slipped and fell into the sewer.

My mother saw that she wasn't around just now, but she heard someone shouting in the manhole, "Mom, pull me out!" " "Mom realized that she had just been transferred to the CMC.

She just pulled up with all her strength.

Mom regrets it very much. She wants to know about it earlier. We should cover the manhole cover when we come, which is convenient for ourselves and others! This story tells us: always be considerate of others and be a noble child.

Why is the manhole cover round? The teacher asked me to write a composition topic! Can't help it! This involves the practical application of circles and squares (including squares, rectangles, diamonds and other quadrangles) in manhole covers.

Vehicles and pedestrians pass by the manhole cover at any time, so the circular manhole cover is mainly used because each diameter passing through its center has the same length, so if the manhole cover is rolled up by passing vehicles, its diameter will be slightly wider than the wellhead below, and the manhole cover will not fall into the wellhead.

However, if a square is used, because the diagonal of the square is obviously longer than the length of each side, when the manhole cover is rolled up, it is easy to fall into the well along the diagonal direction of the wellhead, causing potential safety hazards.

Some people may ask, if the wellhead is round or obviously smaller than the manhole cover, the square manhole cover will not fall into the well.

This involves maximizing the use and saving of materials.

The use of wellhead depends on the size of wellhead. If a square manhole cover with a much larger area than the wellhead must be placed on it, the utilization rate and practical value of materials will naturally not be more effective than that of directly placing a round manhole cover, which not only saves the materials of the manhole cover, but also ensures the safety of the wellhead.

The manhole cover was stolen. It was a sunny day. As usual, the white rabbit took a bamboo basket and drove its beloved red car to dig radishes in the suburbs.

Not far from the car, the little white rabbit suddenly saw a black hole on the main road ahead, so he parked his car on the right side of the road and got off. It turned out that the manhole cover of a well was stolen, and the hole still gave off a stench.

The little white rabbit thought, "this can't be done!" How dangerous! What if someone accidentally falls in? " So she quickly took out the bamboo basket containing radish from the trunk of the car, buckled it upside down on the wellhead cover, quickly found a hard card, and wrote on it with a brush: "Be careful of danger!" These four striking characters fix it on the side of the bamboo basket in the direction of the car.

After doing this, the white rabbit took out his mobile phone and called the urban management and the black cat sheriff respectively to report what happened here.

Soon, the black cat sheriff came to the scene.

In a short time, the urban management also rushed over and put on a new manhole cover.

On the same day, the case of the manhole cover being stolen was detected by the black cat sheriff.

It turned out that the wine mouse had no money to drink and stole the manhole cover.

I changed money at the junk yard and took the money to the hotel to buy wine.

It is said that when the black cat sheriff caught him, he slept soundly in the quilt and was drunk! The next day, all the waste collection stations received a notice from the black cat sheriff: it is forbidden to use the manhole cover, and offenders will be prosecuted! Since then, the city has recovered its former tranquility and beauty, and the manhole cover has never been lost.

A few days ago, Yuan Yuan moved to a new community.

Because the community was built soon, many facilities are not complete.

I don't know if the worker's uncle forgot, or what.

Look! There is also a deep well with a big mouth on a path connecting the community and the expressway, which seems to be pouring out its dissatisfaction.

People walked by the well, some glanced at it, some frowned, some muttered something, but they didn't stop.

Yuan Yuan and her mother walked slowly down the highway and told her that the kindergarten teacher had told her about safety today. She listened carefully and was praised by the teacher.

I also pointed to my mother's prize-a big red balloon.

Just then, he came to the well with his mouth wide open. Yuan Yuan pointed to the wellhead and said, "The teacher said today that a pit without a manhole cover is a safety hazard. Warning signs or brightly colored objects should be placed near the well to remind people of safety.

"Mother touched Yuan Yuan's head and said," Yuan Yuan is really smart! Be able to apply what you have learned.

So what do we do now? Yuan Yuan cocked his head and bit his index finger for a while. He cried happily, "I have an idea!" " He took off the red balloon wrapped around his wrist and said, "The color of this red balloon is very bright. As soon as people see it, they will know there is danger ahead. They should avoid it, so it is not dangerous.

"Mom agreed to nod.

Mother was afraid that the balloon would float away, so she picked up a stone for Yuanyuan and tied it on the balloon rope, which was fixed with the wellhead.

People can't help but stop and look at the well with little red riding hood again.

Why the manhole cover is circular, then the circle naturally becomes the shape of the sewer manhole; Since the well is round, the manhole cover must also be round.

This fourth point came to my mind from the beginning, but now it has become more specific. In order to prove that my answer is correct and find a more convincing answer than this, the cross section of a person climbing down a ladder is basically round and more convincing.

The answer to "why the manhole cover is round" came out. I searched the information online.

After reading the information, I found four reasons why circular manhole covers are better than square manhole covers.

Second, because the circular manhole cover is the easiest to carry.

Third, the circular manhole cover will not fall off, while other manhole covers with regular shapes may accidentally fall off.

This fourth point is about wells, because cylindrical wells can best withstand the pressure of the surrounding land.

First, things with the same material, thickness and volume have the largest circular area, which can save a lot of steel; Of course, if the well is square, then the manhole cover must also be square.

But I don't think my answer is very convincing? As soon as the question came out, I immediately got the answer: because the well is round, the manhole cover is round and square. I am surprised: Why do most manhole covers are round, but I always see round manhole covers? No matter you walk in the street or alley, you will see brown and black manhole covers.

The manhole cover is circular, and there should be enough space for one person to pass through the sewer outlet hole.

One day in homework help, Little Rabbit bought a basket of big and sweet peaches in the market. He wanted to show it to his grandmother.

Little rabbit is walking happily on the way to grandma's house. Suddenly he was knocked down by something, which made him grin and spilled peaches all over the floor.

He looked down and found that a manhole cover was not covered properly. The water in the well was dirty and smelly, and the smell was very bad.

The little rabbit was scared out in a cold sweat. It thought, "It's too dangerous. If other small animals fall in, they won't be drowned alive! " ! No, I'm going to report

"The manhole cover is so heavy that it is difficult for the rabbit to cover it. Then, it carefully picked up the scattered peaches and walked happily to grandma's house.

The story of the manhole cover Li Tanjia One summer day, my mother went shopping with a pair of blue hands. The roadside is covered with trees and beautiful flowers.

On the way to shopping, Lan Lan saw that the manhole cover was not covered properly, and thought: If people passing by at night don't see it, they will fall.

She said to her mother, "I want to go back and cover the manhole cover."

Mom said casually, "It's none of our business."

"Mom took light light blue strut away.

It is getting dark. On the way home, Lan Lan ran to cover the manhole cover and accidentally fell into the CMC.

I only see a pair of small hands, and so does my mother. She threw down her bag and went out crying to save light blue.

We shouldn't learn to care about others like our blue mother.

Instructor Cui Meiru

In Japan, manhole covers have become a distinctive city business card. People not only design manhole covers in various ways, but also endow them with guiding functions and various commemorative meanings.

The pattern on it will tell you what the city is most famous and interesting, or the historical story of the city.

Recently, Japan has set off a craze for finding special manhole covers. Intentional "hunters" found 6,000 manhole covers with unique designs all over the country.

Of the 65,438+0,780 towns in Japan, 95% have adopted manhole covers with unique designs (the remaining 5% have used ready-made templates).

It is said that since 1958, Japan took the manhole cover in Tokyo as an example, for a long time, manhole covers have been shaped everywhere.

It was not until 1977 that the fish-shaped manhole cover was adopted for the first time in Okinawa, implying the desire to build a beautiful living environment.

This practice quickly swept all over Japan, and all localities launched their own "personalized" manhole covers.

Kuansheng Kamiyama, the first mold worker who made the fish-shaped manhole cover, won the "Modern Famous Worker" award from Japan.

Although it is a small square inch, all parts of Japan have racked their brains to make a big fuss about the manhole cover.

This manhole cover in Tokyo belongs to Shibuya, Tokyo, and all the manhole covers in Tokyo have patterns similar to cherry blossoms.

And the manhole cover is marked with some symbols similar to the date.

Besides the design of patterns, Japanese manhole covers have many other advantages. For example, in many countries, manhole covers are the main noise source in cities, because manhole covers are not tightly attached to the road surface, which makes vehicles make unpleasant noises when they run over manhole covers.

But this problem has been well solved in Japan.

In the 1970s, due to public protests against noise, manufacturers improved the shape of manhole covers, changed the original cylindrical shape into conical shape, and changed the vertical plane in the thickness direction into an inclined plane with a certain inclination angle, thus enhancing the fit with the road surface and successfully solving the noise problem.

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Please indicate the source? Manufacturing technology of manhole cover