该新管防腐、防渗透性好，且可不开挖修复旧管，同时延长了管道的使用寿命。
The old pipelines so treated are anti-corrosive, non-permeable and have a longer serve life.
它可不开挖跨路面、铁路和河流铺设下水道，煤气管和电缆管路等，结构简单、工作方便、施工费用低。
It can be used in the laying of sewage, gas pipe or electric cable tunnel without opening the road surface, railroad or riverbed. It is of simple construction, easy operation and low cost.
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