Galvanized pipes as well as the intensity of anti-squeezing out new water mains are incomparable materials, which means that the old methods do not work on the new bypass pipe material weaknesses.

• 镀锌管的强度以及抗挤压性是新型水管材料无法比拟的，沿用老方法施工就意味着没有避开新型水管材料的弱点。