Fixed sections, also known as (fixed supports, fixed piers), are generally divided into internal fixed sections and external fixed piers, including fixed piers with drainage pipes. External fixed piers require a fixed pile to secure them. During the process of laying straight-buried steam pipeline, due to the high pressure generated by steam transmission, fixed piers play a role in securing the pipeline to prevent displacement. Due to the principle of thermal expansion and contraction, they provide excellent compensation for steam pipelines.