Dongguan Reinforced Concrete Pipe Manufacturer - Factory Price - Wholesaler - Which One is the Best? [Songshulin Environmental Protection Building Materials Co., Ltd., Dongguan] The main feature of concrete pipes is that they utilize the expansion effect of self-compacting cement (see special cement) during the hardening process to produce pre-stress, simplifying the manufacturing process. Compared to steel pipes, concrete pipes can save a significant amount of steel, extend service life, require less investment to establish a factory, and are easy to lay and install. They are widely used in factories, mines, oil fields, ports, urban construction, and irrigation and water conservancy projects in farmlands. They are used for conveying fluids such as water, oil, and gas. Concrete pipes are divided into four categories: plain concrete pipes, ordinary reinforced concrete pipes, self-compacting reinforced concrete pipes, and pre-stressed concrete pipes. According to the different inner diameters of concrete pipes, they can be classified into small-diameter pipes (inner diameter below 400mm), medium-diameter pipes (400-1400mm), and large-diameter pipes (above 1400mm). Depending on the water pressure-bearing capacity of the pipes, they can be categorized as low-pressure pipes and pressure pipes, with working pressures generally 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 tongue-and-groove 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.