What do you think are the characteristics of ductile iron manhole covers?

Ductile iron manhole cover is a kind of ductile iron products, ductile iron through spheroidization and inoculation treatment to obtain spheroidal graphite, effectively improve the mechanical properties of cast iron, especially improve plasticity and toughness, so as to obtain higher strength than carbon steel. Ductile iron is a high-strength cast iron material developed in the fifties of the 20th century, its comprehensive properties are close to steel, it is based on its excellent performance, has been successfully used to cast some parts with complex stress, strength, toughness and wear resistance. Ductile iron has rapidly developed into a very widely used cast iron material second only to gray cast iron.

So-called"Iron instead of steel", mainly refers to ductile iron. Ductile iron manhole cover is generally divided into round and square, in the road administration of the urban area, generally adopt circular, because the circular manhole cover is not easy to tilt, can better protect the safety of pedestrians and vehicles. The use of round is mainly due to the fact that the length of each diameter of the circular manhole cover through its circle center is the same, so that if the manhole cover is rolled up by a passing vehicle, because no matter how it is rolled, its diameter will be slightly wider than the wellhead below, and the manhole cover will not fall into the wellhead.

And if the square is adopted, because the diagonal of the square is obviously longer than the length of each side, when such a manhole cover is rolled, it is easy to fall into the well along the diagonal direction of the wellhead, causing potential safety hazards. If the wellhead is made round or significantly smaller than the manhole cover, the square manhole cover will not fall into the well. This involves the issue of maximizing the use and saving of materials.

The use of manhole cover depends on the size of the wellhead, if you have to install a square manhole cover with an area far greater than the wellhead, then the utilization and practical value of the material are naturally not more effective than the direct use of the round manhole cover, which not only saves the material of the manhole cover, but also ensures the safety of the wellhead. In the countryside and cable wells, the square shape is generally used, which can better prevent the ingress of liquids such as rainwater. <>

Before installation, the foundation planning of the manhole cover must be stable, and the size of the manhole cover should be installed to determine the required inner diameter, length and width of the manhole cover of the device. The brick masonry of ductile iron manhole cover should be determined according to the size of the manhole cover designed by the design institute to determine its inner diameter or length * width, square circle (if the construction is best according to the real sample), it can also be implemented with corresponding reference standards. When laying the well, it must be noted that the inner diameter of the wellhead should be consistent with the inner diameter of the manhole cover grate, and the installed manhole cover should be level with the road surface.

After the concrete or asphalt is poured and laid on the well seat, the cover should be opened and cleaned in time to avoid mortar or asphalt pouring the inspection manhole cover and the seat as a whole, so as not to affect the future opening. When the cement pavement well seat is installed, the brick masonry of the wellhead is smoothed with C25 concrete casting 20cm thick ring beam, and the well seat must be kept square, the whole is flat, and the concrete protection ring with a width of 40cm is cast in the manhole cover (if it is a cement pavement, the concrete protection ring with a width of 20cm can also be cast, and reinforced with steel bars) The maintenance period should be more than 10 days. In order to maintain the beauty of the appearance of the ductile iron manhole cover, the surface pattern and handwriting are clear, the cover should be covered with thin iron sheet or waste engine oil during the construction of asphalt pavement to prevent asphalt oil from spraying on the manhole cover; During the construction of cement pavement, the manhole cover should be covered with plastic film to prevent the cement mortar from contaminating the surface of the manhole cover, damaging the surface pattern and handwriting, and the surface of the manhole cover can also be cleaned with water after the construction on the same day.

When installing ductile iron manhole cover on the asphalt pavement, it is necessary to pay attention to avoid the construction machinery directly rolling the well seat, and when the road surface is cast as a whole, it should be reserved in the road surface slightly larger than the well seat, and placed after the asphalt is paved. Ensure the quality of manhole cover placement to prolong the service life. <>

The difference between ductile iron wells and mud wells.

Hello dear <>

Ductile iron wells and mud wells are two different types of wells, and their differences are:1The material is different:

The material of the ductile iron well is ductile iron. The material of the mud well is often concrete or masonry. 2.

The production process is different: ductile iron wells are generally made by ductile iron process, which can make the casting have high strength and corrosion resistance. The mud well is manufactured by pouring formwork.

3.Different application scenarios: ductile iron wells are mainly used in urban drainage, water supply engineering and other fields, which are characterized by strong structure, good sealing and strong corrosion resistance.

Mud wells are mainly used for rainwater collection and storage in rural areas, and their chain measures are characterized by low cost and easy production. 4.Shapes and sizes are different:

Ductile iron wells are usually round or square in shape and range in size from small to large. Mud wells, on the other hand, are usually cylindrical or rectangular in shape and relatively small in size. <>

To sum up, ductile iron wells and mud wells have their own application scenarios and characteristics, and the specific selection should be considered according to actual needs.

Shockproof, a U-shaped groove is set up in the well ring, and the rubber strip is built in, so that in the process of contact between the manhole cover and the well ring, it can be buffered and reduce the seismic force.

Anti-sound, the contact occlusal surface of the manhole cover and the well ring directly acts on the T-shaped rubber strip to eliminate noise.

Anti-theft, the open ring at the end of the inner wall of the manhole cover is connected with the manhole cover through the fixed shaft of the well seat, and the pin body of the inner wall at the other end is fixed, and the dark lock adopts nylon bushing, which will never rust.

Anti-displacement, the well ring has 4 fixed bolt openings, and each set uses 4 ground anchor bolts to effectively prevent displacement caused by rolling.

Anti-breakage, large load, strong load-bearing, will not be easily broken and deformed, and has a certain safety guarantee.

Abstract:Cast iron manhole covers are divided into ductile iron manhole covers and gray cast iron manhole covers, generally speaking, ductile iron manhole covers of the same weight are stronger than gray iron manhole covers. The material used in gray iron manhole cover is generally HT200, and the material used in ductile manhole cover is generally QT500-7.

In general, the advantages of cast iron manhole cover are strong anti-theft function, no noise, reasonable design socks dismantling, long service life, etc., which can be used for more than 30 years, what are the advantages and characteristics of the specific cast iron manhole cover and what is the service life of the cast iron manhole cover, let's take a closer look in the article! 1. What are the advantages and characteristics of cast iron manhole covers?

Cast iron manhole covers are generally divided into round and square, which are used to conceal the deep wells on the road or at home and avoid people or objects from falling.

The advantages and characteristics of cast iron manhole covers are as follows:

1. The cast iron manhole cover has a strong anti-theft function, and it is made of anti-theft cast iron, which cannot be damaged by non-people.

2. There is no noise in cast iron manhole covers, and all cast iron manhole covers are processed by lathes to deal with the noise generated by wheel rolling.

3. The design of the cast iron manhole cover is reasonable, and the device is easy to open, which is convenient for the inspection and maintenance of underground pipeline facilities.

4. The cast iron manhole cover has beautiful appearance, light weight, large load-bearing, clear casting pattern and excellent anti-slip function.

5. Cast iron manhole cover has good toughness and strong corrosion resistance.

Second, what is the service life of the cast iron manhole cover.

The cast iron manhole cover has a long service life, and the cast iron manhole cover products can be used normally for more than 30 years under the open-air conditions of -40oC-80oC. But in daily use, we should also pay attention to how to learn some ways to extend the service life of cast iron manhole covers:

1. There is dust in the production environment of cast iron manhole cover, in order to prevent the product from being affected by dust, it can be removed with water or alkaline solution, and the adhesion of dust and scale can be cleaned with high-pressure water or steam.

2. To avoid scratches on the cast iron manhole cover, in order to prevent the accumulation of dirt on the surface of the manhole cover, it is necessary to clean the surface scratches of the manhole cover.

3. The rust spots on the cast iron manhole cover need to be treated. Cast iron manhole covers occasionally see rust spots during the production process, which indicates that the appearance of the product is contaminated and needs to be disposed of before use.

Hello, glad to answer for you. First, the quality of cast iron manhole covers should be strictly implemented in accordance with the relevant standards of inspection. 1. Observe from the appearance:

If you look carefully from the appearance, there should be no obvious casting defects, the pattern on the upper surface should be clearly visible, and the handwriting should be clear. 2. The flatness of the cast iron manhole cover should be inspected: we can use a special fetus to check the flatness of the manhole cover, the simple method is that we can make a diameter for the size and depth of the product we use for the size and depth of the fetus is almost 37mm, because these dimensions are formed by machining, the manhole cover can be placed in the fetus during the inspection can not have shaking and sound, and the height of the manhole cover can not exceed the fetus, and the depth of the fitting gap should be between 3mm.

3. The method of sampling inspection is used to carry out the load-bearing load of the cast iron manhole cover: the specific method is to test the pressure of the press, if the bearing pressure of the manhole cover is 360kn or 210kN, it can be confirmed as a qualified product. Second, for the quality inspection of the well ring of the cast iron manhole cover:

1. From the appearance of the observation: the same as the manhole cover, there should be no obvious casting defects. 2. You can take a special tool to check the diameter of the well ring, the size of the manhole cover can be controlled within the diameter range, and the depth of the manhole cover can be controlled at 40mm.