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地下管道免开挖加固修复技术，就是利用高喷技术在管道四周进行全包裹围封，形成骨架，并在管道以下营建高喷凝结体承重底板，与围封骨架连成一体，加大地基受力面积；采用静压灌浆调整地基应力；封堵清淤及断口焊接相结合的工艺方法．该方法经哈尔滨第三发电厂重力引水管、汉川电厂自流引水管及徐州市朝阳南路立交桥排水管的加固修复实践表明，该法施工速度快、效果好。
Excavation reinforcement underground pipeline repair technology is the use of high-jet technology in the pipeline around the whole package enclosure, the formation of skeleton, and in the pipeline to build high-spray condensate bearing load floor, and enclosing skeleton into one, to increase the ground by Force area; using static pressure grouting to adjust the foundation stress; sealing dredging and fracture welding process combination. The method of reinforcement and repair practice of the gravity pipe of Harbin No.3 Power Plant, the self-flowing water pipe of Hanchuan Power Plant and the overpass of Chaoyang South Road of Xuzhou City shows that the method has the advantages of fast construction speed and good effect.