Replacing steel bellows with cement pipes, cost advantage analysis of renovation projects

In urban old pipe network upgrade projects, the replacement of cement pipes with steel bellows is a commonly used optimization scheme, and its cost advantage can be quantified from multiple dimensions. The first is the procurement and installation cost: although the purchase price of steel bellows per meter is slightly higher than that of ordinary cement pipes, the weight is only about 1/5 of the same specification of cement pipes, no heavy lifting equipment is required, the manual installation efficiency is increased by about 30%, and the total installation cost of a single project can be reduced by 15% -20%. At the same time, the steel bellows are connected by socket type, which has good sealing performance and no need for additional anti-seepage treatment, further reducing the cost of auxiliary materials. The second is the long-term maintenance cost: the cement pipe material is brittle and easy to crack, and the interior is easy to scale and silt. It needs to be dredged and repaired every 3-5 years, and the single maintenance cost is high; while the steel belt corrugated pipe has excellent corrosion resistance and anti-settlement performance. The normal service life can reach more than 30 years. It only needs simple daily inspection, and the long-term maintenance cost can be reduced by more than 60%. Furthermore, the construction period and indirect costs: the installation process of the steel belt corrugated pipe is simplified, and the single-section pipe network transformation period can be shortened by 2-3 days, which can reduce the impact on road traffic and residents' lives, and avoid various hidden losses caused by the delay in the construction period. In addition, the steel belt corrugated pipe can be recycled and reused, and the waste treatment cost is much lower than that of the cement pipe. It meets the environmental protection requirements Overall, the transformation project of replacing cement pipes with steel bellows, although the upfront procurement cost has increased slightly, the comprehensive cost advantage of the whole life cycle is significant, making it an economical and practical choice for pipe network transformation.