水下长距离顶管是一种直接在地下水位以下的土层中顶进管道的施工方法。采用这一方法无须进行土方开挖,并可避免为疏干和固结土体而采用降水等辅助措施,从而大大加快进度,降低造价,并能克服在穿越江 Underwater long-distance pipe jacking is a direct way in the soil below the water level into the pipeline construction methods. This method eliminates the need for excavation of earthwork and avoids the use of ancillary measures such as precipitation for dewatering and consolidation of soils, thereby greatly accelerating progress, reducing costs and overcoming the need to move through the river