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由宝钢二十冶分指挥部和冶金部建筑研究总院合作,在国内应用单管旋喷桩的基础上,成功地采用一整套三重管旋喷施工法,并正式用于宝钢初轧一号铁皮坑工程防止坑底涌土。加固基坑面积为45.3×18.3米,深-22.3米,旋喷厚度自基底起4.5米,总桩数约700根。三重管与单管法相比其特点是,旋喷桩直径达1.0～2.0米,而单管法通常直径为0.5米左右;用高压清水泵代替单管法的高压泥浆泵,磨损少,并可使用性能可靠的国产柱塞泵。
In cooperation with Baosteel Twenty Branch Metallurgical Headquarters and the Ministry of Metallurgical Construction Research Institute, a single-tube rotary jet grouting pile was successfully applied on the basis of the application of single-tube rotary jet grouting piles in China, and it was formally used for Baosteel’s initial rolling No.1. Tin pit project to prevent the bottom of earth. The area of reinforced pits is 45.3×18.3 meters, depth is −22.3 meters, spin spray thickness is 4.5 meters from the base, and the total number of piles is about 700. Compared with the single tube method, the characteristics of the triple tube is that the diameter of the rotary jet pile is 1.0-2.0 meters, and the single tube method is usually about 0.5 meters in diameter. The high-pressure mud pump replaced by the single-tube high-pressure water pump has little wear and tear. Use a reliable domestic piston pump.