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三重管高压旋喷桩有着适用土层广、成桩效果好、经济性价比高、周围环境影响小等优点。在上海轨交12号线龙漕路站旋喷桩施工过程中,发现当浅层存在松散土体时,由旋喷加固引起的周边地层隆起量大大超标,经过分析发现返浆不畅是导致此问题的主要原因。为此通过扩大导孔、加设PVC套管以及原孔返浆等技术改良措施,取得了良好的效果。
The triple-tube high-pressure rotary jet grouting pile has the advantages of wide application range, good pile-forming effect, high economic cost performance and small impact on the surrounding environment. During the construction of the rotary jet grouting pile at Longcao Road Station of Shanghai Rail Transit Line 12, it was found that when the loose soil was found in the shallow layer, the uplift of the surrounding strata caused by the jet grouting greatly exceeded the standard. The main reason for this problem. To this end by expanding the guide hole, add PVC casing and the original hole back to pulp and other technical improvements, and achieved good results.