DJM machine restructuring of high pressure jet grouting Drilling: drilling in two sequences. Improved use 130mm swing over the alloy drill drilling, in order to prevent the collapse of the use of Slurry Wall. The final hole to be sprayed for a long time, should be stamped at the orifice be protected from debris falling into the hole. After the rig in place mat smooth firm, horizontal ruler to measure the level of the body, vertical vertical, drilling holes and Design hole deviation of not more than 50mm. Tilt rate should not exceed 1% of the dam soft foundation treatment, rig caliber 127mm. Drilling depth is not less than the design bottom elevation requirements. Drilling 3m each application level gauge to measure a railroad residential soft foundation treatment in the drilling process, avoid tilting deviation caused by the drilling process. DJM machine restructuring under high pressure jet grouting pipes spraying: High-pressure jet grouting program shall be divided into two soft foundation treatment, high pressure jet grouting hole adjacent intervals should not be less than 24 hours. Soft ground before the next injection pipe water conservancy processing equipment, should be aligned to the interview spray and spray direction and angle, normal spray test after applying tape to seal the nozzle to prevent nozzle clogging may occur in the course of the hole.