Overall diameter rotary jet grouting reliability solidification body (length) by the soil affect concave appearance was irregular, hard soil consolidation diameter (length) to be smaller, high-pressure jet grouting, uniformity It should be higher than normal static pressure grouting. Also what kind of jet grouting pile driver well, consolidation body in excellent (no concrete erosion) environment, the intensity increased, the strength of the rate of increase continued to more than 10 years. Measured increase by 1.5 times and even 10 years later. Therefore, twin-tube high-pressure jet grouting pile how much money, as long as no concrete erosion in groundwater and not cold (ie freezing temperature not lower than minus 200C) conditions Churning Pile, reliable and easy to move a small solidification body Churning pile can be used as a permanent foundation and seepage curtain. Ground pressure circle spray reinforcement principle: High Pressure Injection Method is based on the grouting, high pressure injection technology and developed a new foundation reinforcement methods. It is designed to take advantage of the ejection tube is inserted into the project as a pilot hole drilling rig, the post-treatment with a special nozzle depth, with high pressure pumps and other high-voltage pulse generating device, the slurry or water flow 20 ~ 40 MPa high-pressure spray from the nozzle the impact cutting soil. When the energy, speed, dynamic pressure was pulsating like a jet strength of soil structure over time, peel off the soil particles begins with the soil. Part of the fine soil particles are injected slurry was replaced with the liquid stream is brought to the surface soil (commonly known as oozing slurry). The remaining soil particles and slurry mixing, according to a certain proportion of the slurry and soil quality have rearranged regular size. After the slurry is solidified, they form a consolidated body, the moving direction of solidification body shape and jet stream about the soil. High pressure jet grouting method for handling mud, muddy clay, clay soil, silt, loess, sand, artificial fill and other foundations. When the large particle size boulders contain more, hard clay soil, a large number of plant roots or excessive use organic matter, it should determine the extent of its use according to the results of the field test.