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1979年起结合宝钢初轧工程的需要,宝钢廿冶分指挥部和冶金部建筑研究总院合作进行了较大规模的三重管旋喷试验,经过一年多的研究,开发了以国内设备和技术条件为基础的“三重管旋喷桩施工法”,并在上海宝钢初轧1号铁皮坑中首次完成700根深层旋喷桩的施工任务。施工速度达7(根/台班)。这样的施工规模和速度与国外相比是罕见的。三重管旋喷法是用高压水和压缩空气同时喷射、切削地基。同时,用较低压力由另外一个喷嘴喷出水
Since 1979, in conjunction with Baosteel’s preliminary rolling project, Baosteel Handan Metallurgical Branch Command cooperated with the Ministry of Metallurgical Construction Research Institute to carry out a large-scale triple-tube spin test. After more than a year of research, it has developed domestic equipment and Based on the technical conditions, the “three-pipe swirling grouting pile construction method” was carried out, and the construction of 700 deep jet grouting piles was completed for the first time in the No. 1 tin pit of Shanghai Baosteel. The construction speed reaches 7 (root / taiwan). Such construction scale and speed are rare compared with foreign countries. The triple tube spin jet method uses high pressure water and compressed air to simultaneously spray and cut the ground. At the same time, water is sprayed from another nozzle with lower pressure