水下顶管是在普通顶管基础上发展起来的一项新的施工技术。它在施工前不需要降低地下水位、疏干和固结土壁,可以直接在地下水位以下顶管,也可以在流砂层中顶管。因此用这一方法施工的管道可以穿越用普通顶管无法施工的江、河、湖、泊,还可以直接顶向水域。 Underwater pipe jacking is a new construction technology developed on the basis of ordinary pipe jacking. It does not need to reduce the groundwater level, drain and consolidate the soil wall before construction. It can be directly piped under the groundwater level, and it can also be piped in the flowing sand layer. Therefore, pipelines constructed by this method can pass through rivers, rivers, lakes, and moorings that cannot be constructed using ordinary pipe jacking, and can also be directed directly to waters.