Cement pipes, also known as pressure pipes and reinforced concrete pipes, are used primarily for urban construction infrastructure, including sewage drainage, flood prevention, and water supply in special factories and agricultural wells. They are generally categorized into: flat-end reinforced concrete cement pipes, flexible bell-end reinforced concrete cement pipes, socket-and-spigot reinforced concrete cement pipes, F-type steel socket cement pipes, flat-end sleeve joint cement pipes, and bell-end cement pipes, among others. Made of plastic concrete, the pipe wall structure is layered after molding, affecting the concrete's load-bearing capacity. The concrete grade is typically C30, but can also be C40. However, the concrete strength at the pipe mouth is lower than the body, making it unsuitable for manhole installation.