Carat tube and steel belt bellows, performance comparison and analysis

In municipal drainage and sewage projects, carat pipe and steel belt corrugated pipe are two common polymer pipes, and their respective structural designs determine the difference in performance emphasis. Carat pipe adopts the thermal winding process of high-density polyethylene structural wall, and the pipe wall is smooth and has T-shaped reinforcement ribs to form an integrated solid-wall pipe structure. Steel belt corrugated pipe uses spiral wound steel belt as reinforcement, and the inner and outer composite polyethylene layers are typical steel-plastic composite special-shaped pipes. From the perspective of ring stiffness performance, both can achieve high ring stiffness by adjusting the structure, but the mechanism is different. The carat pipe relies on the inertia moment of the pipe wall to resist external pressure, the force is uniform, and the creep rate is low; the steel belt corrugated pipe relies on the steel belt skeleton support, and the short-term strength is outstanding, but the bonding quality of the steel-plastic interface is extremely high, and it is easy to cause instability if it is debonded. In terms of sealing, the carat pipe is often sealed by socket electric fusion welding or rubber ring, and the interface and the pipe body are melted into one, which can achieve zero leakage; the steel belt corrugated pipe is mostly sealed with heat shrinkage tape or socket, and the connection is greatly affected by the construction method, which needs to be strictly controlled. In terms of hydraulic characteristics, the inner wall of the carat pipe is smooth, the Manning coefficient is low, and the transportation resistance is small; the steel belt corrugated pipe has a trough structure. Although the inner layer is smooth, the overall hydraulic performance is In terms of construction adaptability, carat pipes are relatively light in weight, have good toughness, and have strong resistance to uneven settlement of foundations; steel bellows are more sensitive to backfill compactness and large particle size hard objects due to the existence of steel belts, and need to be refined for construction. Overall, the two pipes have their own strengths. When selecting types, they should be comprehensively considered in combination with burial depth, geological conditions, load requirements and sealing grade. There are no absolute advantages or disadvantages, only whether they are suitable for the actual project.