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高压喷射注浆技术是一种加固松软土层和防渗堵漏的新方法。它的实质是利用钻机将带有直径为2～3mm喷嘴的注浆管钻至欲加固土层的预定深度后,从两侧的喷嘴喷射出20MPa左右的高压水泥浆,将土层切割使之崩解并与水泥浆混合,最终形成水泥土固结体,后者的强度最高可达5～10MPa。喷浆时,钻杆在旋转的同时也向上提升,这就叫旋喷。此时形成的固结体成圆柱形。如果钻杆不旋转,只是作小角度摆动,也是一边喷射一边提升,这就叫定喷,此时的固结体形成孤板形。密集的固结体、圆柱形的或弧板
High-pressure jet grouting technology is a new method of strengthening loose soil and seepage and plugging. Its essence is to use a rig to drill a grouting pipe with a diameter of 2 to 3mm to a predetermined depth of soil to be reinforced. A high pressure cement slurry of about 20MPa is sprayed from the nozzles on both sides to cut the soil layer. Disintegrate and mix with the cement slurry to form cement-consolidated body. The strength of the latter is up to 5-10 MPa. During shotcreting, the drill pipe also lifts upwards as it rotates. This is called rotary jetting. The consolidated body formed at this time is cylindrical. If the drill pipe doesn’t rotate, it only makes a small angle swing, and it also raises on the side of the jet. This is called the fixed jet, and the consolidation body at this time forms a lone plate shape. Dense consolidations, cylindrical or arc plates