Cement mortar anti-corrosion spiral steel pipe

Description :

　　Cement mortar anti-corrosion spiral steel pipe price: A cast iron pipe with a diameter of 1000 mm on a certain road in Shanghai was coated with asphalt for internal anti-corrosion. After the water was supplied in 1967, the inner wall of the pipe began to scale year by year. In 1970, the roughness coefficient value was measured, which means that the water delivery capacity decreased by 2300 in less than 3 years; A steel pipe with a diameter of 625 mm was laid on a certain road in Shanghai in 1933. The inner wall of the pipe was lined with cement mortar and has been flowing for more than 50 years. No scaling has been found, only a layer of smooth sediment is attached to the surface of the cement mortar coating, and the roughness coefficient value has been stable. Considering that cement mortar lining is suitable for both steel pipes and cast iron pipes, technically reliable, economically reasonable, and harmless to human health, it has been promoted and used in some cities such as Shanghai. The application of mature cement mortar lining in the anti-corrosion of the inner wall of water transmission steel pipes has a history of nearly a hundred years. The pipelines constructed with cement mortar lining in China in the early 1930s are still running well today. The construction methods and technologies for cement mortar lining are mature, including air delivery method, centrifugal method, spraying method, etc. Not only some construction units, but also specialized equipment and tools for rust removal coating and testing, and the range of pipe diameters that can be constructed. At the same time, the China Engineering Construction Standardization Association has developed a unified and complete technical standard for cement mortar lining of buried water supply steel pipes, further ensuring construction quality. The construction of cement mortar lining is simple, and the rust removal requirements for the inner wall of the steel pipe are relatively low. There is strong bonding stress between the cement mortar and the inner wall of the steel pipe, which is not easy to peel off. If the inner wall is too smooth, it reduces the mechanical interlocking effect and makes it difficult for the cement mortar to adhere. This simplifies the construction process. The construction methods of cement mortar lining, such as air delivery, centrifugation, and spraying, can all achieve mechanized operation, which is simple and fast. In this project, the construction method of cement mortar lining for water transmission steel pipes adopts spraying method, which is carried out by Yangzhou Steel Pipe Factory at the steel pipe production site. The curing time for cement mortar lining shall not be less than 7 days, and the ambient temperature shall not be lower than 10 ℃. After meeting the maintenance time, transport the steel pipes to the installation construction site. The cement mortar lining at the steel pipe fittings and welding joints shall be manually applied at the installation and construction site, with a curing time of not less than 7 days and an ambient temperature of not less than 10 ℃. The pressure test of the water supply steel pipe and the backfilling of the soil cover shall be carried out sequentially after meeting the curing time of the cement mortar lining.

　　Cement mortar anti-corrosion spiral steel pipe

　　When the pipeline of the cement mortar spraying machine malfunctions, it must be immediately shut down, powered off, and depressurized before it can be dealt with.

　　When leaving work or interrupting homework, measures must be taken at the entrance and exit of pipelines to prevent pedestrians from falling and ensure driving safety.

　　When curing the cement mortar for internal anti-corrosion during on-site construction, the wellhead on the pipeline must be securely covered, and the pit must be enclosed and marked with safety signs.

　　After the anti-corrosion operation inside the pipeline is completed, the commanding personnel should immediately count the number of workers and confirm that all personnel inside the pipeline have withdrawn before leaving the site.

　　5. During homework, it must be directed by the homework team leader. Ground entrances and exits should be monitored by dedicated personnel and safety signs should be set up. Contact should be maintained between the inside and outside of the management, and coordination should be consistent.

　　When carrying out on-site cement mortar anti-corrosion operations inside the pipeline, the pipeline must be well ventilated; Before entering the pipeline for work, the manhole cover must be opened for ventilation. Before entering, it is necessary to first detect the concentration of oxygen, toxic and harmful gases in the internal air, and confirm that the concentration of oxygen and toxic and harmful gases in the air is qualified before entering the operation; If the homework is not entered immediately, it should be retested, confirmed as qualified, and recorded before entering again; During homework, it is necessary to dynamically monitor the air quality in the work environment, confirm that it is qualified, and record it.

　　When using centrifugal prefabrication method for anti-corrosion construction of pipe joint mortar, the prefabrication site should have smooth drainage, not pollute the environment, and not disturb the residents; Centrifugal equipment should undergo construction design and draw construction drawings; Mechanical equipment installation should be stable, safety devices should be complete and effective, and electrical wiring must comply with the specific requirements of construction electrical safety technical disclosure.

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