Shenzhen Concrete Pipe Customization - Wholesaler - Hot Sale - Installation [Songshulin Environmental Protection Building Materials Co., Ltd.] Concrete pipes are tubes made from batch concrete or reinforced concrete, used for conveying fluids such as water, oil, and gas. They are categorized into four types: plain concrete pipes, normal reinforced concrete pipes, self-compacting reinforced concrete pipes, and pre-stressed concrete pipes. Their main feature is the use of self-compacting cement (see special cement) to produce pre-stress through expansion during the hardening process, simplifying the manufacturing process. Compared to steel pipes, concrete pipes can save a significant amount of steel, extend service life, require less investment to set up factories, and are easy to install, making them widely used in factories, mines, oil fields, ports, urban construction, and irrigation projects. They are used for conveying fluids such as water, oil, and gas. Concrete pipes are divided into four categories: plain concrete pipes, normal reinforced concrete pipes, self-compacting reinforced concrete pipes, and pre-stressed concrete pipes. Depending on the internal diameter of the pipe, they can be classified into small diameter pipes (below 400mm), medium diameter pipes (400-1400mm), and large diameter pipes (above 1400mm). Based on the pipe's ability to withstand water pressure, they can be categorized into low-pressure pipes and pressure pipes, with working pressures typically ranging from 0.4 to 1.2 MPa. Compared to steel pipes, concrete pipes can also be divided into flat-end pipes, socket-and-spigot pipes, and bell-and-spigot pipes. Their joint types include cement mortar tape joints, wire mesh cement mortar tape joints, cement mortar socket-and-spigot joints, and rubber ring socket-and-spigot joints.