Guangzhou Reinforced Concrete Pipe Price - Factory - Usage - Manufacturer [Dongguan Songshulin Environmental Protection Building Materials Co., Ltd.] 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, which simplifies the manufacturing process. Compared to steel pipes, concrete pipes can significantly save on steel, extend service life, require less investment to establish factories, and are easy to lay and install. They have been widely used in factories, mines, oil fields, ports, urban construction, and irrigation projects. They are used for transporting 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 inner diameter of the concrete pipe, they can be classified into small diameter pipes (inner diameter less than 400mm), medium diameter pipes (400-1400mm), and large diameter pipes (over 1400mm). Depending on the water pressure resistance of the pipes, they can be divided into low-pressure pipes and pressure pipes, with working pressures generally at 0.4, 0.6, 0.8, 1.0, 1.2 MPa, etc. Compared to steel pipes, concrete pipes can also be divided into flat mouth pipes, socket and spigot pipes, and socket-type pipes based on the type of pipe joint. The interface forms include cement mortar strip joints, steel mesh cement mortar strip joints, cement mortar socket and spigot joints, and rubber ring socket and spigot joints.