Hengyang Zhengxiang Ductile Iron Manhole Cover Installation and Operation Precautions Now, the application of nodular cast iron manhole covers in our lives is very common. It is often seen on the road that the quality of nodular cast iron manhole covers will affect the safety of pedestrians. Therefore, its Quality must be guaranteed. In fact, there are many factors that affect the quality of castings. The quality of nodular cast iron manhole covers includes appearance quality, intrinsic quality and use quality. Any factor may affect the overall quality, so every aspect cannot be ignored. Project scope During the construction of Hengyang Zhengxiang in summer, part of the drawings at the pipe joints can be properly covered to avoid sunlight exposure and cracking of the joints; in some building areas, water pressure for the hydrostatic test is insufficient. At this time, air can be used for testing; in hot weather Consider using vegetable oils. When using oil. In order to ensure the use of the pipeline; if in winter, it can be preheated with hot water and installed quickly; when filling trenches, ductile iron manhole covers need to be compacted in layers to ensure that the soil in the pipeline is not too soft and the pipeline is inclined; if On the main road, some coarse sand should be filled on the top of the pipeline to ensure that nodular cast iron pipes are not stressed. In the construction process, if we want to prevent the interface, we need to perform the construction in accordance with the specifications during the installation process to ensure that each pipe is installed in place, whether it is a large caliber or a strict inspection of the rubber ring; we can use a wet rubber ring to make installing the pipe faster and easier . If the pipeline needs to be borrowed but does not meet its own conditions, it needs to be cut according to the angle in order to transfer the angle to a large extent to ensure the safety of the pipeline in future use. What is the classification of ductile iron caps? What are the advantages of ductile iron cover? Where to maintain the beautiful appearance of the cover, the surface pattern and handwriting are clear, apply thin iron cover on the manhole cover or the brushed cover of waste engine oil during asphalt pavement construction to prevent the asphalt oil from spraying on the manhole cover; during cement pavement construction Cover the manhole cover with a plastic film to prevent the cement mortar from contaminating the surface of the manhole cover and damaging the surface patterns and handwriting. You can also use water to clean the surface of the manhole cover when construction is completed on the day. As workshops cost more and more attention to the environment, all regions have begun to rectify the environment for greening. How much is the installation of Hengyang ’s steamed and ductile iron manhole covers? Waterways are inevitable in greening. For pedestrian safety, we need to cover the waterway openings. At this time, nodular cast iron manhole covers come in handy. We will find that most of the manhole covers are circular. So why do manufacturers not design square or other shapes when they are good nodular cast iron manhole covers, they must be designed to be circular. ? What are the special requirements? The integrity service developed after the completion of the process, and the process is improved, which is the widely used ductile iron manhole cover, compared with the cast iron manhole cover, its bearing capacity is better, and it is not easy to rust, the toughness of the material is also Very good, mainly used in areas with high load requirements, the scope of application is particularly wide. It is often used on the main roads, and heavy nodular cast iron manhole covers are used on asphalt roads. Ductile iron manhole covers require more difficult craftsmanship. As a kind, they have excellent design capabilities and usually do not require additional components. However, iron and steel are particularly suitable for excellent mechanical properties in many applications. Although they may look similar on the surface, similar flash appearances appear, it is important to know the advantages and disadvantages of each in terms of good and application. Hengyang steamed Xiang ductile iron manhole cover installation and operation precautions Ductile iron material itself also has very good corrosion performance and excellent flame retardance characteristics, and it is very simple to install. Some special designs are adopted to avoid loss after installation. In order to add their use characteristics, the graphic design on the appearance of the product is also very thoughtful. How much money is required for good plasticity: elongation ≥7%, similar to high carbon steel, while gray iron material has zero elongation. Comprehensive Quality Assurance
Hengyang Steamed Xiang Ductile Iron Manhole Cover Installation and Operation Precautions Product appearance is different: In general, heavy ductile iron manhole cover thickness is much thicker than ordinary manhole cover, while ordinary manhole cover is much lighter in weight and much thinner in thickness ; Ductile iron manhole cover materials are different: Generally, the materials of heavy nodular cast iron manhole covers are cast iron. This is because only cast iron materials can achieve the required strength, while ordinary manhole cover materials can be cast iron or other materials, such as Composite materials, resin materials, high materials, etc .; The application range is different: heavy manhole covers are generally used in places with heavy loads, such as airports, highways, terminals, ring roads, Hengyang steamed and ductile iron manhole covers, labor costs, and urban expressways A common feature of this kind of occasion is that it will be subjected to high load and pressure. The application range of ordinary manhole covers is in this range, such as access roads, small, community, bicycle lanes, township-level highways, etc. Ductile iron manhole covers, frames and grilles. Why are all materials now ductile iron? In the installation of cast iron manhole covers, the manhole cover manufacturers often lay the pipe with a curve but the arc is not large. At this time, the pipe should be installed in straight line before the pipe is turned in place. During the installation process, the wood must be used outside the arc. Paved support to prevent displacement. Ductile iron manhole covers have a long service life: corrosion resistance, no rust, no pollution, and maintenance-free. Cast iron manhole covers are becoming more and more common in daily life, and their use value is becoming more and more important. First look at the cement manhole cover. The cement manhole cover is generally used in small areas where the load is not too heavy. When installing, there is sufficient clearance between the edge of the well cover and the pool wall. The cement manhole cover should be leveled. As the new tree pit sinks, it must be timely plugged to prevent the manhole cover from protruding and to prevent the body from rolling. Hengyang steamed Xiang load-bearing load is tested by pressure on the press using spot check method. Ductile iron manhole cover pressure is 360KN or 210KN to confirm the qualified batch. What do the standards require for common ductile iron manhole covers? Ductile iron manhole covers are divided into round and square. In urban road management, circular manhole covers are usually used because they are not easy to tilt and can better protect the safety of pedestrians and vehicles. The use of the circular cover plate mainly considers that the length of each diameter in the center of the circular cover plate is the same, so if the cover plate is rolled by the vehicle, the diameter will be slightly wider than the diameter of the wellhead below. The lid will not fall into the wellhead. Nodular cast iron manhole cover features: good toughness: impact value is similar to medium carbon steel, more than 10 times that of gray iron material. The original Shizuishan has high intensity. Tensile strength ób≥420MPa, yield strength ós≥300MPa, which is the same as low-carbon steel, which is twice as much as gray iron material. Hengyang steamed Xiang ductile iron manhole cover installation and operation precautions Secondly, we also need to regularly clean the dust on the surface of nodular cast iron manhole cover. Steel castings are often carried out in dusty places, and there is often a lot of dust in the air, which constantly falls on the surface of the equipment. They can be removed with water or alkaline solutions. However, adherent dust requires high-pressure water or steam to clean it. Trustworthy product details are different: Heavy Ductile Iron Manhole Covers are much thicker than ordinary Manhole Covers, while Ordinary Ductile Iron Manhole Covers are lighter and thinner; Materials are different: Material differences mean that heavy Ductile Iron Manhole covers need to be cast iron because only cast iron is used Materials can achieve the required strength, while ordinary light ductile iron manhole cover materials can be used for cast iron, but also other materials, such as composite materials, resin materials, high materials, etc. Ductile iron manhole covers have different application scope and occasions: heavy duty ductile iron manhole covers It is generally used for heavy-duty occasions, such as airports, highways, terminals, ring roads, urban expressways, etc. The common feature of this occasion is that it will withstand high loads and heavy pressures. The application scope of ordinary light ductile iron manhole covers is in this range, such as sidewalks, small, residential areas, bicycle lanes, township roads, etc. Ductile iron manhole covers are made of spheroidal graphite by spheroidizing and inoculating it with nodular cast iron, which can not only improve the mechanical properties of cast iron, but also improve plasticity and toughness, so as to obtain nodular cast iron with higher strength than carbon steel. Into nodular cast iron manhole covers, then how can we improve the quality of nodular cast iron manhole covers?
Hengyang Steamed Xiang Ductile Iron Manhole Cover Installation and Operation Precautions The appearance of the manhole cover is beautiful. The cast pattern is clear and the anti-skid performance is good. Now the ductile iron manhole cover is in great demand. Municipal, real estate, and villas all have manhole covers. The crowd is also getting bigger and bigger. Many purchasers usually need to purchase many things, so the manhole covers are uncertain. How can ordinary purchasers purchase good nodular manhole covers? Click to view. Nodular cast iron manhole cover well inspection appearance: no obvious Casting defects. If the wellhead is round or significantly smaller than the wellhead cover, the square cover will not fall into the well. This is a matter of saving material. The use of a wellhead depends on the size of the wellhead. If a square manhole cover with a larger area than the wellhead is installed on it, not using a round manhole cover directly will not only save the manhole cover material, but also ensure the wellhead safety, and the material and practical value of the wellhead will not increase. Wellhead. In rural areas and cable wells, squares are often used to better prevent rainwater from entering. Chloride ions exist in the use environment of manhole covers: Chloride ions are widely present, such as salt, sweat, seawater, etc. In the environment in the presence of chloride ions, the corrosion is fast and even exceeds that of ordinary low carbon steel. Therefore, the use environment of the manhole cover has requirements, and it is necessary to remove the dust frequently and keep it clean and dry. First of all, during installation, the pipe is unevenly stressed or the pipe is hoisted incorrectly, resulting in an increase in frictional resistance, which makes it difficult to place the pipe. In response to this situation, a steel saddle can be welded with a hook at the position where the lower mouth is at the centerline of the pipe. Place the saddle on the socket end during installation, so that the two sides of the pipe are evenly stressed during installation. Sincerely for you. With the rapid development of the city scale and the imperfect municipal infrastructure, the manholes have been stolen and broken many times in major cities across the country. The loss of the new generation bayonet-type ductile iron anti-theft manhole cover prevented the above-mentioned occurrence. This product has many functions such as anti-vibration, anti-sound, anti-theft, anti-slip, anti-shift, anti-break. Concrete pouring When the concrete is poured, the road surface around the wellhead should be covered with protective materials to prevent the cement slurry from contaminating the road surface. Covering sprinkler is adopted for conservation and enclosing measures are taken to prevent artificial concrete structures or loosening of cast iron manhole covers.